diff --git a/20230516/rtech-20230516.txt b/20230516/rtech-20230516.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d45645a038d9d3d3f4cce52165751a1777c8109f
--- /dev/null
+++ b/20230516/rtech-20230516.txt
@@ -0,0 +1,17 @@
+Speicherschutzmechanismen, 16.05.2023, 12:40:56
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Renesas-Mikrocontroller:
+Registergruppen (z.B. alle Funktionen zum Clock-Monitoring) müssen
+vor Benutzung durch Schreiben in ein Sperr-Register freigegeben werden.
+Sinnvollerweise sollte man Sie nach Benutzung wieder sperren.
+"Register" steht hier für Speicherzellen mit spezieller Bedeutung, z.B.
+I/O-Ports, Speicherzellen zur Interrupt-Konfiguration usw.
+
+Intel/AMD-Architektur:
+Das Betriebssystem teilt dem Programm Segmente zu.
+Die Segmentregister wirken als Indizes für eine Tabelle,
+die nur der Betriebssystemkern ändern kann.
+Wenn das Benutzerprogramm versucht, die Tabelle zu ändern
+oder auf nicht freigegebene Segmente zuzugreifen, unterbricht
+die Hardware das Benutzerprogramm und ruft stattdessen eine
+Routine im Betriebssystemkern auf ("Exception").
diff --git a/20230516/stack-01.c b/20230516/stack-01.c
new file mode 100644
index 0000000000000000000000000000000000000000..05bc444398a61511411c0258ddcf0ed9222968a2
--- /dev/null
+++ b/20230516/stack-01.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int sum (int a, int b)
+{
+  return a + b;
+}
+
+int main (void)
+{
+  int a = 3;
+  int b = 9;
+  int c = sum (a, b);
+  printf ("c = %d\n", c);
+  return 0;
+}
diff --git a/20230516/stack-01.s b/20230516/stack-01.s
new file mode 100644
index 0000000000000000000000000000000000000000..8f7406e0cee7f144bff8fbc03567c95abe68d717
--- /dev/null
+++ b/20230516/stack-01.s
@@ -0,0 +1,36 @@
+	.file	"stack-01.c"
+	.text
+	.globl	sum
+	.type	sum, @function
+sum:
+.LFB11:
+	.cfi_startproc
+	leal	(%rdi,%rsi), %eax
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	sum, .-sum
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"c = %d\n"
+	.text
+	.globl	main
+	.type	main, @function
+main:
+.LFB12:
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	movl	$12, %esi
+	leaq	.LC0(%rip), %rdi
+	movl	$0, %eax
+	call	printf@PLT
+	movl	$0, %eax
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE12:
+	.size	main, .-main
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/20230516/stack-02.c b/20230516/stack-02.c
new file mode 100644
index 0000000000000000000000000000000000000000..268d7265e77fa765eb90e7b7ad0895cb220f09b1
--- /dev/null
+++ b/20230516/stack-02.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include "sum.h"
+
+int main (void)
+{
+  int a = 3;
+  int b = 9;
+  int c = sum (a, b);
+  printf ("c = %d\n", c);
+  return 0;
+}
diff --git a/20230516/stack-02.s b/20230516/stack-02.s
new file mode 100644
index 0000000000000000000000000000000000000000..7844403f9356b2236b5e7dab9c32840524339b9e
--- /dev/null
+++ b/20230516/stack-02.s
@@ -0,0 +1,958 @@
+	.file	"stack-02.c"
+	.text
+.Ltext0:
+	.section	.rodata.str1.1,"aMS",@progbits,1
+.LC0:
+	.string	"c = %d\n"
+	.text
+	.globl	main
+	.type	main, @function
+main:
+.LFB11:
+	.file 1 "stack-02.c"
+	.loc 1 5 1 view -0
+	.cfi_startproc
+	subq	$8, %rsp
+	.cfi_def_cfa_offset 16
+	.loc 1 6 3 view .LVU1
+.LVL0:
+	.loc 1 7 3 view .LVU2
+	.loc 1 8 3 view .LVU3
+	.loc 1 8 11 is_stmt 0 view .LVU4
+	movl	$9, %esi
+	movl	$3, %edi
+	call	sum@PLT
+.LVL1:
+	.loc 1 9 3 is_stmt 1 view .LVU5
+	movl	%eax, %esi
+	leaq	.LC0(%rip), %rdi
+	movl	$0, %eax
+.LVL2:
+	.loc 1 9 3 is_stmt 0 view .LVU6
+	call	printf@PLT
+.LVL3:
+	.loc 1 10 3 is_stmt 1 view .LVU7
+	.loc 1 11 1 is_stmt 0 view .LVU8
+	movl	$0, %eax
+	addq	$8, %rsp
+	.cfi_def_cfa_offset 8
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	main, .-main
+.Letext0:
+	.file 2 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h"
+	.file 3 "/usr/include/x86_64-linux-gnu/bits/types.h"
+	.file 4 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h"
+	.file 5 "/usr/include/x86_64-linux-gnu/bits/types/FILE.h"
+	.file 6 "/usr/include/stdio.h"
+	.file 7 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h"
+	.file 8 "sum.h"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x37a
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x8
+	.uleb128 0x1
+	.long	.LASF50
+	.byte	0xc
+	.long	.LASF51
+	.long	.LASF52
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.long	.LASF7
+	.byte	0x2
+	.byte	0xd8
+	.byte	0x17
+	.long	0x39
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x4
+	.byte	0x8
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF2
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF5
+	.uleb128 0x5
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x5
+	.long	.LASF6
+	.uleb128 0x2
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x96
+	.byte	0x19
+	.long	0x6c
+	.uleb128 0x2
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x97
+	.byte	0x1b
+	.long	0x6c
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x91
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF10
+	.uleb128 0x7
+	.long	0x91
+	.uleb128 0x8
+	.long	.LASF53
+	.byte	0xd8
+	.byte	0x4
+	.byte	0x31
+	.byte	0x8
+	.long	0x224
+	.uleb128 0x9
+	.long	.LASF11
+	.byte	0x4
+	.byte	0x33
+	.byte	0x7
+	.long	0x65
+	.byte	0
+	.uleb128 0x9
+	.long	.LASF12
+	.byte	0x4
+	.byte	0x36
+	.byte	0x9
+	.long	0x8b
+	.byte	0x8
+	.uleb128 0x9
+	.long	.LASF13
+	.byte	0x4
+	.byte	0x37
+	.byte	0x9
+	.long	0x8b
+	.byte	0x10
+	.uleb128 0x9
+	.long	.LASF14
+	.byte	0x4
+	.byte	0x38
+	.byte	0x9
+	.long	0x8b
+	.byte	0x18
+	.uleb128 0x9
+	.long	.LASF15
+	.byte	0x4
+	.byte	0x39
+	.byte	0x9
+	.long	0x8b
+	.byte	0x20
+	.uleb128 0x9
+	.long	.LASF16
+	.byte	0x4
+	.byte	0x3a
+	.byte	0x9
+	.long	0x8b
+	.byte	0x28
+	.uleb128 0x9
+	.long	.LASF17
+	.byte	0x4
+	.byte	0x3b
+	.byte	0x9
+	.long	0x8b
+	.byte	0x30
+	.uleb128 0x9
+	.long	.LASF18
+	.byte	0x4
+	.byte	0x3c
+	.byte	0x9
+	.long	0x8b
+	.byte	0x38
+	.uleb128 0x9
+	.long	.LASF19
+	.byte	0x4
+	.byte	0x3d
+	.byte	0x9
+	.long	0x8b
+	.byte	0x40
+	.uleb128 0x9
+	.long	.LASF20
+	.byte	0x4
+	.byte	0x40
+	.byte	0x9
+	.long	0x8b
+	.byte	0x48
+	.uleb128 0x9
+	.long	.LASF21
+	.byte	0x4
+	.byte	0x41
+	.byte	0x9
+	.long	0x8b
+	.byte	0x50
+	.uleb128 0x9
+	.long	.LASF22
+	.byte	0x4
+	.byte	0x42
+	.byte	0x9
+	.long	0x8b
+	.byte	0x58
+	.uleb128 0x9
+	.long	.LASF23
+	.byte	0x4
+	.byte	0x44
+	.byte	0x16
+	.long	0x23d
+	.byte	0x60
+	.uleb128 0x9
+	.long	.LASF24
+	.byte	0x4
+	.byte	0x46
+	.byte	0x14
+	.long	0x243
+	.byte	0x68
+	.uleb128 0x9
+	.long	.LASF25
+	.byte	0x4
+	.byte	0x48
+	.byte	0x7
+	.long	0x65
+	.byte	0x70
+	.uleb128 0x9
+	.long	.LASF26
+	.byte	0x4
+	.byte	0x49
+	.byte	0x7
+	.long	0x65
+	.byte	0x74
+	.uleb128 0x9
+	.long	.LASF27
+	.byte	0x4
+	.byte	0x4a
+	.byte	0xb
+	.long	0x73
+	.byte	0x78
+	.uleb128 0x9
+	.long	.LASF28
+	.byte	0x4
+	.byte	0x4d
+	.byte	0x12
+	.long	0x50
+	.byte	0x80
+	.uleb128 0x9
+	.long	.LASF29
+	.byte	0x4
+	.byte	0x4e
+	.byte	0xf
+	.long	0x57
+	.byte	0x82
+	.uleb128 0x9
+	.long	.LASF30
+	.byte	0x4
+	.byte	0x4f
+	.byte	0x8
+	.long	0x249
+	.byte	0x83
+	.uleb128 0x9
+	.long	.LASF31
+	.byte	0x4
+	.byte	0x51
+	.byte	0xf
+	.long	0x259
+	.byte	0x88
+	.uleb128 0x9
+	.long	.LASF32
+	.byte	0x4
+	.byte	0x59
+	.byte	0xd
+	.long	0x7f
+	.byte	0x90
+	.uleb128 0x9
+	.long	.LASF33
+	.byte	0x4
+	.byte	0x5b
+	.byte	0x17
+	.long	0x264
+	.byte	0x98
+	.uleb128 0x9
+	.long	.LASF34
+	.byte	0x4
+	.byte	0x5c
+	.byte	0x19
+	.long	0x26f
+	.byte	0xa0
+	.uleb128 0x9
+	.long	.LASF35
+	.byte	0x4
+	.byte	0x5d
+	.byte	0x14
+	.long	0x243
+	.byte	0xa8
+	.uleb128 0x9
+	.long	.LASF36
+	.byte	0x4
+	.byte	0x5e
+	.byte	0x9
+	.long	0x47
+	.byte	0xb0
+	.uleb128 0x9
+	.long	.LASF37
+	.byte	0x4
+	.byte	0x5f
+	.byte	0xa
+	.long	0x2d
+	.byte	0xb8
+	.uleb128 0x9
+	.long	.LASF38
+	.byte	0x4
+	.byte	0x60
+	.byte	0x7
+	.long	0x65
+	.byte	0xc0
+	.uleb128 0x9
+	.long	.LASF39
+	.byte	0x4
+	.byte	0x62
+	.byte	0x8
+	.long	0x275
+	.byte	0xc4
+	.byte	0
+	.uleb128 0x2
+	.long	.LASF40
+	.byte	0x5
+	.byte	0x7
+	.byte	0x19
+	.long	0x9d
+	.uleb128 0xa
+	.long	.LASF54
+	.byte	0x4
+	.byte	0x2b
+	.byte	0xe
+	.uleb128 0xb
+	.long	.LASF41
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x238
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x9d
+	.uleb128 0xc
+	.long	0x91
+	.long	0x259
+	.uleb128 0xd
+	.long	0x39
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x230
+	.uleb128 0xb
+	.long	.LASF42
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x25f
+	.uleb128 0xb
+	.long	.LASF43
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x26a
+	.uleb128 0xc
+	.long	0x91
+	.long	0x285
+	.uleb128 0xd
+	.long	0x39
+	.byte	0x13
+	.byte	0
+	.uleb128 0xe
+	.long	.LASF44
+	.byte	0x6
+	.byte	0x89
+	.byte	0xe
+	.long	0x291
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x224
+	.uleb128 0xe
+	.long	.LASF45
+	.byte	0x6
+	.byte	0x8a
+	.byte	0xe
+	.long	0x291
+	.uleb128 0xe
+	.long	.LASF46
+	.byte	0x6
+	.byte	0x8b
+	.byte	0xe
+	.long	0x291
+	.uleb128 0xe
+	.long	.LASF47
+	.byte	0x7
+	.byte	0x1a
+	.byte	0xc
+	.long	0x65
+	.uleb128 0xc
+	.long	0x2d1
+	.long	0x2c6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0x7
+	.long	0x2bb
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x98
+	.uleb128 0x7
+	.long	0x2cb
+	.uleb128 0xe
+	.long	.LASF48
+	.byte	0x7
+	.byte	0x1b
+	.byte	0x1a
+	.long	0x2c6
+	.uleb128 0x10
+	.long	.LASF55
+	.byte	0x1
+	.byte	0x4
+	.byte	0x5
+	.long	0x65
+	.quad	.LFB11
+	.quad	.LFE11-.LFB11
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x364
+	.uleb128 0x11
+	.string	"a"
+	.byte	0x1
+	.byte	0x6
+	.byte	0x7
+	.long	0x65
+	.byte	0x3
+	.uleb128 0x11
+	.string	"b"
+	.byte	0x1
+	.byte	0x7
+	.byte	0x7
+	.long	0x65
+	.byte	0x9
+	.uleb128 0x12
+	.string	"c"
+	.byte	0x1
+	.byte	0x8
+	.byte	0x7
+	.long	0x65
+	.long	.LLST0
+	.long	.LVUS0
+	.uleb128 0x13
+	.quad	.LVL1
+	.long	0x364
+	.long	0x348
+	.uleb128 0x14
+	.uleb128 0x1
+	.byte	0x55
+	.uleb128 0x1
+	.byte	0x33
+	.uleb128 0x14
+	.uleb128 0x1
+	.byte	0x54
+	.uleb128 0x1
+	.byte	0x39
+	.byte	0
+	.uleb128 0x15
+	.quad	.LVL3
+	.long	0x370
+	.uleb128 0x14
+	.uleb128 0x1
+	.byte	0x55
+	.uleb128 0x9
+	.byte	0x3
+	.quad	.LC0
+	.byte	0
+	.byte	0
+	.uleb128 0x16
+	.string	"sum"
+	.string	"sum"
+	.byte	0x8
+	.byte	0x1
+	.byte	0xc
+	.uleb128 0x17
+	.long	.LASF49
+	.long	.LASF49
+	.byte	0x6
+	.value	0x14c
+	.byte	0xc
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x26
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x13
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x21
+	.byte	0
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1c
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x17
+	.uleb128 0x2137
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x4109
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x31
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x14
+	.uleb128 0x410a
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x18
+	.uleb128 0x2111
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x15
+	.uleb128 0x4109
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x31
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x16
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.uleb128 0x6e
+	.uleb128 0x8
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x17
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.uleb128 0x6e
+	.uleb128 0xe
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0x5
+	.uleb128 0x39
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_loc,"",@progbits
+.Ldebug_loc0:
+.LVUS0:
+	.uleb128 .LVU5
+	.uleb128 .LVU6
+	.uleb128 .LVU6
+	.uleb128 .LVU7
+.LLST0:
+	.quad	.LVL1-.Ltext0
+	.quad	.LVL2-.Ltext0
+	.value	0x1
+	.byte	0x50
+	.quad	.LVL2-.Ltext0
+	.quad	.LVL3-1-.Ltext0
+	.value	0x1
+	.byte	0x54
+	.quad	0
+	.quad	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x2c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x8
+	.byte	0
+	.value	0
+	.value	0
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.quad	0
+	.quad	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF19:
+	.string	"_IO_buf_end"
+.LASF27:
+	.string	"_old_offset"
+.LASF47:
+	.string	"sys_nerr"
+.LASF22:
+	.string	"_IO_save_end"
+.LASF5:
+	.string	"short int"
+.LASF7:
+	.string	"size_t"
+.LASF32:
+	.string	"_offset"
+.LASF50:
+	.string	"GNU C17 8.3.0 -mtune=generic -march=x86-64 -g2 -O"
+.LASF16:
+	.string	"_IO_write_ptr"
+.LASF11:
+	.string	"_flags"
+.LASF18:
+	.string	"_IO_buf_base"
+.LASF23:
+	.string	"_markers"
+.LASF13:
+	.string	"_IO_read_end"
+.LASF36:
+	.string	"_freeres_buf"
+.LASF46:
+	.string	"stderr"
+.LASF31:
+	.string	"_lock"
+.LASF6:
+	.string	"long int"
+.LASF49:
+	.string	"printf"
+.LASF28:
+	.string	"_cur_column"
+.LASF53:
+	.string	"_IO_FILE"
+.LASF52:
+	.string	"/home/peter/bo/2023ss/rtech/20230516"
+.LASF2:
+	.string	"unsigned char"
+.LASF51:
+	.string	"stack-02.c"
+.LASF4:
+	.string	"signed char"
+.LASF33:
+	.string	"_codecvt"
+.LASF1:
+	.string	"unsigned int"
+.LASF41:
+	.string	"_IO_marker"
+.LASF30:
+	.string	"_shortbuf"
+.LASF15:
+	.string	"_IO_write_base"
+.LASF39:
+	.string	"_unused2"
+.LASF12:
+	.string	"_IO_read_ptr"
+.LASF3:
+	.string	"short unsigned int"
+.LASF10:
+	.string	"char"
+.LASF55:
+	.string	"main"
+.LASF34:
+	.string	"_wide_data"
+.LASF35:
+	.string	"_freeres_list"
+.LASF37:
+	.string	"__pad5"
+.LASF42:
+	.string	"_IO_codecvt"
+.LASF0:
+	.string	"long unsigned int"
+.LASF17:
+	.string	"_IO_write_end"
+.LASF9:
+	.string	"__off64_t"
+.LASF8:
+	.string	"__off_t"
+.LASF24:
+	.string	"_chain"
+.LASF43:
+	.string	"_IO_wide_data"
+.LASF21:
+	.string	"_IO_backup_base"
+.LASF44:
+	.string	"stdin"
+.LASF26:
+	.string	"_flags2"
+.LASF38:
+	.string	"_mode"
+.LASF14:
+	.string	"_IO_read_base"
+.LASF29:
+	.string	"_vtable_offset"
+.LASF20:
+	.string	"_IO_save_base"
+.LASF48:
+	.string	"sys_errlist"
+.LASF25:
+	.string	"_fileno"
+.LASF40:
+	.string	"FILE"
+.LASF45:
+	.string	"stdout"
+.LASF54:
+	.string	"_IO_lock_t"
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/20230516/sum-01.c b/20230516/sum-01.c
new file mode 100644
index 0000000000000000000000000000000000000000..48eb1d4d8ead895edfbb84790cd572b2fa27bce1
--- /dev/null
+++ b/20230516/sum-01.c
@@ -0,0 +1,4 @@
+int sum (int a, int b)
+{
+  return a + b;
+}
diff --git a/20230516/sum-01.s b/20230516/sum-01.s
new file mode 100644
index 0000000000000000000000000000000000000000..d853d21a7f6e87a9c42bae80b6cb9a2a9682287a
--- /dev/null
+++ b/20230516/sum-01.s
@@ -0,0 +1,14 @@
+	.file	"sum.c"
+	.text
+	.globl	sum
+	.type	sum, @function
+sum:
+.LFB0:
+	.cfi_startproc
+	leal	(%rdi,%rsi), %eax
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	sum, .-sum
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/20230516/sum-02.c b/20230516/sum-02.c
new file mode 100644
index 0000000000000000000000000000000000000000..2608f733b5ce26067855b35a75f6ae242619a37d
--- /dev/null
+++ b/20230516/sum-02.c
@@ -0,0 +1,8 @@
+#include <string.h>
+
+int sum (int a, int b)
+{
+  volatile char hello[3];
+  strcpy (hello, "Hello, world!");
+  return a + b;
+}
diff --git a/20230516/sum-02.s b/20230516/sum-02.s
new file mode 100644
index 0000000000000000000000000000000000000000..d01c183d0f0f00e79508a172849c1b133d068fa6
--- /dev/null
+++ b/20230516/sum-02.s
@@ -0,0 +1,30 @@
+	.file	"sum-02.c"
+	.text
+	.globl	sum
+	.type	sum, @function
+sum:
+.LFB0:
+	.cfi_startproc
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register 6
+	movl	%edi, -20(%rbp)
+	movl	%esi, -24(%rbp)
+	leaq	-3(%rbp), %rax
+	movabsq	$8583909746840200520, %rcx
+	movq	%rcx, (%rax)
+	movl	$1684828783, 8(%rax)
+	movw	$33, 12(%rax)
+	movl	-20(%rbp), %edx
+	movl	-24(%rbp), %eax
+	addl	%edx, %eax
+	popq	%rbp
+	.cfi_def_cfa 7, 8
+	ret
+	.cfi_endproc
+.LFE0:
+	.size	sum, .-sum
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/20230516/sum-03.c b/20230516/sum-03.c
new file mode 100644
index 0000000000000000000000000000000000000000..4cbd466b09454764c99a18633c9cc2526d6cc36e
--- /dev/null
+++ b/20230516/sum-03.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <string.h>
+
+int sum (int a, int b)
+{
+  char hello[3];
+  strcpy (hello, "Hello, world!");
+  printf ("%s\n", hello);
+  return a + b;
+}
diff --git a/20230516/sum-03.s b/20230516/sum-03.s
new file mode 100644
index 0000000000000000000000000000000000000000..21733108ec1742c345f494d089c7a551afb4b4e6
--- /dev/null
+++ b/20230516/sum-03.s
@@ -0,0 +1,960 @@
+	.file	"sum-03.c"
+	.text
+.Ltext0:
+	.globl	sum
+	.type	sum, @function
+sum:
+.LVL0:
+.LFB11:
+	.file 1 "sum-03.c"
+	.loc 1 5 1 view -0
+	.cfi_startproc
+	.loc 1 5 1 is_stmt 0 view .LVU1
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	pushq	%rbx
+	.cfi_def_cfa_offset 24
+	.cfi_offset 3, -24
+	subq	$24, %rsp
+	.cfi_def_cfa_offset 48
+	movl	%edi, %ebx
+	movl	%esi, %ebp
+	.loc 1 6 3 is_stmt 1 view .LVU2
+	.loc 1 7 3 view .LVU3
+	leaq	13(%rsp), %rdi
+.LVL1:
+	.loc 1 7 3 is_stmt 0 view .LVU4
+	movabsq	$8583909746840200520, %rax
+	movq	%rax, 13(%rsp)
+	movl	$1684828783, 21(%rsp)
+	movw	$33, 25(%rsp)
+	.loc 1 8 3 is_stmt 1 view .LVU5
+	call	puts@PLT
+.LVL2:
+	.loc 1 9 3 view .LVU6
+	.loc 1 9 12 is_stmt 0 view .LVU7
+	leal	(%rbx,%rbp), %eax
+	.loc 1 10 1 view .LVU8
+	addq	$24, %rsp
+	.cfi_def_cfa_offset 24
+	popq	%rbx
+	.cfi_def_cfa_offset 16
+.LVL3:
+	.loc 1 10 1 view .LVU9
+	popq	%rbp
+	.cfi_def_cfa_offset 8
+.LVL4:
+	.loc 1 10 1 view .LVU10
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	sum, .-sum
+.Letext0:
+	.file 2 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h"
+	.file 3 "/usr/include/x86_64-linux-gnu/bits/types.h"
+	.file 4 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h"
+	.file 5 "/usr/include/x86_64-linux-gnu/bits/types/FILE.h"
+	.file 6 "/usr/include/stdio.h"
+	.file 7 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h"
+	.file 8 "<built-in>"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x364
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x8
+	.uleb128 0x1
+	.long	.LASF49
+	.byte	0xc
+	.long	.LASF50
+	.long	.LASF51
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.long	.LASF7
+	.byte	0x2
+	.byte	0xd8
+	.byte	0x17
+	.long	0x39
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x4
+	.byte	0x8
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF2
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF5
+	.uleb128 0x5
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x5
+	.long	.LASF6
+	.uleb128 0x2
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x96
+	.byte	0x19
+	.long	0x6c
+	.uleb128 0x2
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x97
+	.byte	0x1b
+	.long	0x6c
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x91
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF10
+	.uleb128 0x7
+	.long	0x91
+	.uleb128 0x8
+	.long	.LASF52
+	.byte	0xd8
+	.byte	0x4
+	.byte	0x31
+	.byte	0x8
+	.long	0x224
+	.uleb128 0x9
+	.long	.LASF11
+	.byte	0x4
+	.byte	0x33
+	.byte	0x7
+	.long	0x65
+	.byte	0
+	.uleb128 0x9
+	.long	.LASF12
+	.byte	0x4
+	.byte	0x36
+	.byte	0x9
+	.long	0x8b
+	.byte	0x8
+	.uleb128 0x9
+	.long	.LASF13
+	.byte	0x4
+	.byte	0x37
+	.byte	0x9
+	.long	0x8b
+	.byte	0x10
+	.uleb128 0x9
+	.long	.LASF14
+	.byte	0x4
+	.byte	0x38
+	.byte	0x9
+	.long	0x8b
+	.byte	0x18
+	.uleb128 0x9
+	.long	.LASF15
+	.byte	0x4
+	.byte	0x39
+	.byte	0x9
+	.long	0x8b
+	.byte	0x20
+	.uleb128 0x9
+	.long	.LASF16
+	.byte	0x4
+	.byte	0x3a
+	.byte	0x9
+	.long	0x8b
+	.byte	0x28
+	.uleb128 0x9
+	.long	.LASF17
+	.byte	0x4
+	.byte	0x3b
+	.byte	0x9
+	.long	0x8b
+	.byte	0x30
+	.uleb128 0x9
+	.long	.LASF18
+	.byte	0x4
+	.byte	0x3c
+	.byte	0x9
+	.long	0x8b
+	.byte	0x38
+	.uleb128 0x9
+	.long	.LASF19
+	.byte	0x4
+	.byte	0x3d
+	.byte	0x9
+	.long	0x8b
+	.byte	0x40
+	.uleb128 0x9
+	.long	.LASF20
+	.byte	0x4
+	.byte	0x40
+	.byte	0x9
+	.long	0x8b
+	.byte	0x48
+	.uleb128 0x9
+	.long	.LASF21
+	.byte	0x4
+	.byte	0x41
+	.byte	0x9
+	.long	0x8b
+	.byte	0x50
+	.uleb128 0x9
+	.long	.LASF22
+	.byte	0x4
+	.byte	0x42
+	.byte	0x9
+	.long	0x8b
+	.byte	0x58
+	.uleb128 0x9
+	.long	.LASF23
+	.byte	0x4
+	.byte	0x44
+	.byte	0x16
+	.long	0x23d
+	.byte	0x60
+	.uleb128 0x9
+	.long	.LASF24
+	.byte	0x4
+	.byte	0x46
+	.byte	0x14
+	.long	0x243
+	.byte	0x68
+	.uleb128 0x9
+	.long	.LASF25
+	.byte	0x4
+	.byte	0x48
+	.byte	0x7
+	.long	0x65
+	.byte	0x70
+	.uleb128 0x9
+	.long	.LASF26
+	.byte	0x4
+	.byte	0x49
+	.byte	0x7
+	.long	0x65
+	.byte	0x74
+	.uleb128 0x9
+	.long	.LASF27
+	.byte	0x4
+	.byte	0x4a
+	.byte	0xb
+	.long	0x73
+	.byte	0x78
+	.uleb128 0x9
+	.long	.LASF28
+	.byte	0x4
+	.byte	0x4d
+	.byte	0x12
+	.long	0x50
+	.byte	0x80
+	.uleb128 0x9
+	.long	.LASF29
+	.byte	0x4
+	.byte	0x4e
+	.byte	0xf
+	.long	0x57
+	.byte	0x82
+	.uleb128 0x9
+	.long	.LASF30
+	.byte	0x4
+	.byte	0x4f
+	.byte	0x8
+	.long	0x249
+	.byte	0x83
+	.uleb128 0x9
+	.long	.LASF31
+	.byte	0x4
+	.byte	0x51
+	.byte	0xf
+	.long	0x259
+	.byte	0x88
+	.uleb128 0x9
+	.long	.LASF32
+	.byte	0x4
+	.byte	0x59
+	.byte	0xd
+	.long	0x7f
+	.byte	0x90
+	.uleb128 0x9
+	.long	.LASF33
+	.byte	0x4
+	.byte	0x5b
+	.byte	0x17
+	.long	0x264
+	.byte	0x98
+	.uleb128 0x9
+	.long	.LASF34
+	.byte	0x4
+	.byte	0x5c
+	.byte	0x19
+	.long	0x26f
+	.byte	0xa0
+	.uleb128 0x9
+	.long	.LASF35
+	.byte	0x4
+	.byte	0x5d
+	.byte	0x14
+	.long	0x243
+	.byte	0xa8
+	.uleb128 0x9
+	.long	.LASF36
+	.byte	0x4
+	.byte	0x5e
+	.byte	0x9
+	.long	0x47
+	.byte	0xb0
+	.uleb128 0x9
+	.long	.LASF37
+	.byte	0x4
+	.byte	0x5f
+	.byte	0xa
+	.long	0x2d
+	.byte	0xb8
+	.uleb128 0x9
+	.long	.LASF38
+	.byte	0x4
+	.byte	0x60
+	.byte	0x7
+	.long	0x65
+	.byte	0xc0
+	.uleb128 0x9
+	.long	.LASF39
+	.byte	0x4
+	.byte	0x62
+	.byte	0x8
+	.long	0x275
+	.byte	0xc4
+	.byte	0
+	.uleb128 0x2
+	.long	.LASF40
+	.byte	0x5
+	.byte	0x7
+	.byte	0x19
+	.long	0x9d
+	.uleb128 0xa
+	.long	.LASF53
+	.byte	0x4
+	.byte	0x2b
+	.byte	0xe
+	.uleb128 0xb
+	.long	.LASF41
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x238
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x9d
+	.uleb128 0xc
+	.long	0x91
+	.long	0x259
+	.uleb128 0xd
+	.long	0x39
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x230
+	.uleb128 0xb
+	.long	.LASF42
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x25f
+	.uleb128 0xb
+	.long	.LASF43
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x26a
+	.uleb128 0xc
+	.long	0x91
+	.long	0x285
+	.uleb128 0xd
+	.long	0x39
+	.byte	0x13
+	.byte	0
+	.uleb128 0xe
+	.long	.LASF44
+	.byte	0x6
+	.byte	0x89
+	.byte	0xe
+	.long	0x291
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x224
+	.uleb128 0xe
+	.long	.LASF45
+	.byte	0x6
+	.byte	0x8a
+	.byte	0xe
+	.long	0x291
+	.uleb128 0xe
+	.long	.LASF46
+	.byte	0x6
+	.byte	0x8b
+	.byte	0xe
+	.long	0x291
+	.uleb128 0xe
+	.long	.LASF47
+	.byte	0x7
+	.byte	0x1a
+	.byte	0xc
+	.long	0x65
+	.uleb128 0xc
+	.long	0x2d1
+	.long	0x2c6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0x7
+	.long	0x2bb
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x98
+	.uleb128 0x7
+	.long	0x2cb
+	.uleb128 0xe
+	.long	.LASF48
+	.byte	0x7
+	.byte	0x1b
+	.byte	0x1a
+	.long	0x2c6
+	.uleb128 0x10
+	.string	"sum"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x5
+	.long	0x65
+	.quad	.LFB11
+	.quad	.LFE11-.LFB11
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x34c
+	.uleb128 0x11
+	.string	"a"
+	.byte	0x1
+	.byte	0x4
+	.byte	0xe
+	.long	0x65
+	.long	.LLST0
+	.long	.LVUS0
+	.uleb128 0x11
+	.string	"b"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x15
+	.long	0x65
+	.long	.LLST1
+	.long	.LVUS1
+	.uleb128 0x12
+	.long	.LASF54
+	.byte	0x1
+	.byte	0x6
+	.byte	0x8
+	.long	0x34c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.uleb128 0x13
+	.quad	.LVL2
+	.long	0x35c
+	.uleb128 0x14
+	.uleb128 0x1
+	.byte	0x55
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.long	0x91
+	.long	0x35c
+	.uleb128 0xd
+	.long	0x39
+	.byte	0x2
+	.byte	0
+	.uleb128 0x15
+	.long	.LASF55
+	.long	.LASF56
+	.byte	0x8
+	.byte	0
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x26
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x13
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x21
+	.byte	0
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x17
+	.uleb128 0x2137
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x4109
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x31
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x14
+	.uleb128 0x410a
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x18
+	.uleb128 0x2111
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x15
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.uleb128 0x6e
+	.uleb128 0xe
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_loc,"",@progbits
+.Ldebug_loc0:
+.LVUS0:
+	.uleb128 0
+	.uleb128 .LVU4
+	.uleb128 .LVU4
+	.uleb128 .LVU9
+	.uleb128 .LVU9
+	.uleb128 0
+.LLST0:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL1-.Ltext0
+	.value	0x1
+	.byte	0x55
+	.quad	.LVL1-.Ltext0
+	.quad	.LVL3-.Ltext0
+	.value	0x1
+	.byte	0x53
+	.quad	.LVL3-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x55
+	.byte	0x9f
+	.quad	0
+	.quad	0
+.LVUS1:
+	.uleb128 0
+	.uleb128 .LVU6
+	.uleb128 .LVU6
+	.uleb128 .LVU10
+	.uleb128 .LVU10
+	.uleb128 0
+.LLST1:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL2-1-.Ltext0
+	.value	0x1
+	.byte	0x54
+	.quad	.LVL2-1-.Ltext0
+	.quad	.LVL4-.Ltext0
+	.value	0x1
+	.byte	0x56
+	.quad	.LVL4-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x54
+	.byte	0x9f
+	.quad	0
+	.quad	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x2c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x8
+	.byte	0
+	.value	0
+	.value	0
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.quad	0
+	.quad	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF19:
+	.string	"_IO_buf_end"
+.LASF27:
+	.string	"_old_offset"
+.LASF56:
+	.string	"__builtin_puts"
+.LASF47:
+	.string	"sys_nerr"
+.LASF22:
+	.string	"_IO_save_end"
+.LASF5:
+	.string	"short int"
+.LASF7:
+	.string	"size_t"
+.LASF32:
+	.string	"_offset"
+.LASF49:
+	.string	"GNU C17 8.3.0 -mtune=generic -march=x86-64 -g2 -O"
+.LASF16:
+	.string	"_IO_write_ptr"
+.LASF11:
+	.string	"_flags"
+.LASF18:
+	.string	"_IO_buf_base"
+.LASF23:
+	.string	"_markers"
+.LASF13:
+	.string	"_IO_read_end"
+.LASF36:
+	.string	"_freeres_buf"
+.LASF54:
+	.string	"hello"
+.LASF46:
+	.string	"stderr"
+.LASF31:
+	.string	"_lock"
+.LASF6:
+	.string	"long int"
+.LASF28:
+	.string	"_cur_column"
+.LASF50:
+	.string	"sum-03.c"
+.LASF52:
+	.string	"_IO_FILE"
+.LASF51:
+	.string	"/home/peter/bo/2023ss/rtech/20230516"
+.LASF2:
+	.string	"unsigned char"
+.LASF4:
+	.string	"signed char"
+.LASF33:
+	.string	"_codecvt"
+.LASF1:
+	.string	"unsigned int"
+.LASF41:
+	.string	"_IO_marker"
+.LASF30:
+	.string	"_shortbuf"
+.LASF55:
+	.string	"puts"
+.LASF15:
+	.string	"_IO_write_base"
+.LASF39:
+	.string	"_unused2"
+.LASF12:
+	.string	"_IO_read_ptr"
+.LASF3:
+	.string	"short unsigned int"
+.LASF10:
+	.string	"char"
+.LASF34:
+	.string	"_wide_data"
+.LASF35:
+	.string	"_freeres_list"
+.LASF37:
+	.string	"__pad5"
+.LASF42:
+	.string	"_IO_codecvt"
+.LASF0:
+	.string	"long unsigned int"
+.LASF17:
+	.string	"_IO_write_end"
+.LASF9:
+	.string	"__off64_t"
+.LASF8:
+	.string	"__off_t"
+.LASF24:
+	.string	"_chain"
+.LASF43:
+	.string	"_IO_wide_data"
+.LASF21:
+	.string	"_IO_backup_base"
+.LASF44:
+	.string	"stdin"
+.LASF26:
+	.string	"_flags2"
+.LASF38:
+	.string	"_mode"
+.LASF14:
+	.string	"_IO_read_base"
+.LASF29:
+	.string	"_vtable_offset"
+.LASF20:
+	.string	"_IO_save_base"
+.LASF48:
+	.string	"sys_errlist"
+.LASF25:
+	.string	"_fileno"
+.LASF40:
+	.string	"FILE"
+.LASF45:
+	.string	"stdout"
+.LASF53:
+	.string	"_IO_lock_t"
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/20230516/sum-04.c b/20230516/sum-04.c
new file mode 100644
index 0000000000000000000000000000000000000000..6f3c083f76422b15ffd37c78950bc7e3dd1a25e8
--- /dev/null
+++ b/20230516/sum-04.c
@@ -0,0 +1,10 @@
+#include <stdio.h>
+#include <string.h>
+
+int sum (int a, int b)
+{
+  volatile char hello[3];
+  strcpy (hello, "Hello, world!");
+  printf ("%s\n", hello);
+  return a + b;
+}
diff --git a/20230516/sum-04.s b/20230516/sum-04.s
new file mode 100644
index 0000000000000000000000000000000000000000..ab6869ef2a6b22bb0ae5025a53c670272e53037d
--- /dev/null
+++ b/20230516/sum-04.s
@@ -0,0 +1,960 @@
+	.file	"sum-04.c"
+	.text
+.Ltext0:
+	.globl	sum
+	.type	sum, @function
+sum:
+.LVL0:
+.LFB11:
+	.file 1 "sum-04.c"
+	.loc 1 5 1 view -0
+	.cfi_startproc
+	.loc 1 5 1 is_stmt 0 view .LVU1
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	pushq	%rbx
+	.cfi_def_cfa_offset 24
+	.cfi_offset 3, -24
+	subq	$24, %rsp
+	.cfi_def_cfa_offset 48
+	movl	%edi, %ebx
+	movl	%esi, %ebp
+	.loc 1 6 3 is_stmt 1 view .LVU2
+	.loc 1 7 3 view .LVU3
+	leaq	13(%rsp), %rdi
+.LVL1:
+	.loc 1 7 3 is_stmt 0 view .LVU4
+	movabsq	$8583909746840200520, %rax
+	movq	%rax, 13(%rsp)
+	movl	$1684828783, 21(%rsp)
+	movw	$33, 25(%rsp)
+	.loc 1 8 3 is_stmt 1 view .LVU5
+	call	puts@PLT
+.LVL2:
+	.loc 1 9 3 view .LVU6
+	.loc 1 9 12 is_stmt 0 view .LVU7
+	leal	(%rbx,%rbp), %eax
+	.loc 1 10 1 view .LVU8
+	addq	$24, %rsp
+	.cfi_def_cfa_offset 24
+	popq	%rbx
+	.cfi_def_cfa_offset 16
+.LVL3:
+	.loc 1 10 1 view .LVU9
+	popq	%rbp
+	.cfi_def_cfa_offset 8
+.LVL4:
+	.loc 1 10 1 view .LVU10
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	sum, .-sum
+.Letext0:
+	.file 2 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h"
+	.file 3 "/usr/include/x86_64-linux-gnu/bits/types.h"
+	.file 4 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h"
+	.file 5 "/usr/include/x86_64-linux-gnu/bits/types/FILE.h"
+	.file 6 "/usr/include/stdio.h"
+	.file 7 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h"
+	.file 8 "<built-in>"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x364
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x8
+	.uleb128 0x1
+	.long	.LASF49
+	.byte	0xc
+	.long	.LASF50
+	.long	.LASF51
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.long	.LASF7
+	.byte	0x2
+	.byte	0xd8
+	.byte	0x17
+	.long	0x39
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x4
+	.byte	0x8
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF2
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF5
+	.uleb128 0x5
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x5
+	.long	.LASF6
+	.uleb128 0x2
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x96
+	.byte	0x19
+	.long	0x6c
+	.uleb128 0x2
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x97
+	.byte	0x1b
+	.long	0x6c
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x91
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF10
+	.uleb128 0x7
+	.long	0x91
+	.uleb128 0x8
+	.long	.LASF52
+	.byte	0xd8
+	.byte	0x4
+	.byte	0x31
+	.byte	0x8
+	.long	0x224
+	.uleb128 0x9
+	.long	.LASF11
+	.byte	0x4
+	.byte	0x33
+	.byte	0x7
+	.long	0x65
+	.byte	0
+	.uleb128 0x9
+	.long	.LASF12
+	.byte	0x4
+	.byte	0x36
+	.byte	0x9
+	.long	0x8b
+	.byte	0x8
+	.uleb128 0x9
+	.long	.LASF13
+	.byte	0x4
+	.byte	0x37
+	.byte	0x9
+	.long	0x8b
+	.byte	0x10
+	.uleb128 0x9
+	.long	.LASF14
+	.byte	0x4
+	.byte	0x38
+	.byte	0x9
+	.long	0x8b
+	.byte	0x18
+	.uleb128 0x9
+	.long	.LASF15
+	.byte	0x4
+	.byte	0x39
+	.byte	0x9
+	.long	0x8b
+	.byte	0x20
+	.uleb128 0x9
+	.long	.LASF16
+	.byte	0x4
+	.byte	0x3a
+	.byte	0x9
+	.long	0x8b
+	.byte	0x28
+	.uleb128 0x9
+	.long	.LASF17
+	.byte	0x4
+	.byte	0x3b
+	.byte	0x9
+	.long	0x8b
+	.byte	0x30
+	.uleb128 0x9
+	.long	.LASF18
+	.byte	0x4
+	.byte	0x3c
+	.byte	0x9
+	.long	0x8b
+	.byte	0x38
+	.uleb128 0x9
+	.long	.LASF19
+	.byte	0x4
+	.byte	0x3d
+	.byte	0x9
+	.long	0x8b
+	.byte	0x40
+	.uleb128 0x9
+	.long	.LASF20
+	.byte	0x4
+	.byte	0x40
+	.byte	0x9
+	.long	0x8b
+	.byte	0x48
+	.uleb128 0x9
+	.long	.LASF21
+	.byte	0x4
+	.byte	0x41
+	.byte	0x9
+	.long	0x8b
+	.byte	0x50
+	.uleb128 0x9
+	.long	.LASF22
+	.byte	0x4
+	.byte	0x42
+	.byte	0x9
+	.long	0x8b
+	.byte	0x58
+	.uleb128 0x9
+	.long	.LASF23
+	.byte	0x4
+	.byte	0x44
+	.byte	0x16
+	.long	0x23d
+	.byte	0x60
+	.uleb128 0x9
+	.long	.LASF24
+	.byte	0x4
+	.byte	0x46
+	.byte	0x14
+	.long	0x243
+	.byte	0x68
+	.uleb128 0x9
+	.long	.LASF25
+	.byte	0x4
+	.byte	0x48
+	.byte	0x7
+	.long	0x65
+	.byte	0x70
+	.uleb128 0x9
+	.long	.LASF26
+	.byte	0x4
+	.byte	0x49
+	.byte	0x7
+	.long	0x65
+	.byte	0x74
+	.uleb128 0x9
+	.long	.LASF27
+	.byte	0x4
+	.byte	0x4a
+	.byte	0xb
+	.long	0x73
+	.byte	0x78
+	.uleb128 0x9
+	.long	.LASF28
+	.byte	0x4
+	.byte	0x4d
+	.byte	0x12
+	.long	0x50
+	.byte	0x80
+	.uleb128 0x9
+	.long	.LASF29
+	.byte	0x4
+	.byte	0x4e
+	.byte	0xf
+	.long	0x57
+	.byte	0x82
+	.uleb128 0x9
+	.long	.LASF30
+	.byte	0x4
+	.byte	0x4f
+	.byte	0x8
+	.long	0x249
+	.byte	0x83
+	.uleb128 0x9
+	.long	.LASF31
+	.byte	0x4
+	.byte	0x51
+	.byte	0xf
+	.long	0x259
+	.byte	0x88
+	.uleb128 0x9
+	.long	.LASF32
+	.byte	0x4
+	.byte	0x59
+	.byte	0xd
+	.long	0x7f
+	.byte	0x90
+	.uleb128 0x9
+	.long	.LASF33
+	.byte	0x4
+	.byte	0x5b
+	.byte	0x17
+	.long	0x264
+	.byte	0x98
+	.uleb128 0x9
+	.long	.LASF34
+	.byte	0x4
+	.byte	0x5c
+	.byte	0x19
+	.long	0x26f
+	.byte	0xa0
+	.uleb128 0x9
+	.long	.LASF35
+	.byte	0x4
+	.byte	0x5d
+	.byte	0x14
+	.long	0x243
+	.byte	0xa8
+	.uleb128 0x9
+	.long	.LASF36
+	.byte	0x4
+	.byte	0x5e
+	.byte	0x9
+	.long	0x47
+	.byte	0xb0
+	.uleb128 0x9
+	.long	.LASF37
+	.byte	0x4
+	.byte	0x5f
+	.byte	0xa
+	.long	0x2d
+	.byte	0xb8
+	.uleb128 0x9
+	.long	.LASF38
+	.byte	0x4
+	.byte	0x60
+	.byte	0x7
+	.long	0x65
+	.byte	0xc0
+	.uleb128 0x9
+	.long	.LASF39
+	.byte	0x4
+	.byte	0x62
+	.byte	0x8
+	.long	0x275
+	.byte	0xc4
+	.byte	0
+	.uleb128 0x2
+	.long	.LASF40
+	.byte	0x5
+	.byte	0x7
+	.byte	0x19
+	.long	0x9d
+	.uleb128 0xa
+	.long	.LASF53
+	.byte	0x4
+	.byte	0x2b
+	.byte	0xe
+	.uleb128 0xb
+	.long	.LASF41
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x238
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x9d
+	.uleb128 0xc
+	.long	0x91
+	.long	0x259
+	.uleb128 0xd
+	.long	0x39
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x230
+	.uleb128 0xb
+	.long	.LASF42
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x25f
+	.uleb128 0xb
+	.long	.LASF43
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x26a
+	.uleb128 0xc
+	.long	0x91
+	.long	0x285
+	.uleb128 0xd
+	.long	0x39
+	.byte	0x13
+	.byte	0
+	.uleb128 0xe
+	.long	.LASF44
+	.byte	0x6
+	.byte	0x89
+	.byte	0xe
+	.long	0x291
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x224
+	.uleb128 0xe
+	.long	.LASF45
+	.byte	0x6
+	.byte	0x8a
+	.byte	0xe
+	.long	0x291
+	.uleb128 0xe
+	.long	.LASF46
+	.byte	0x6
+	.byte	0x8b
+	.byte	0xe
+	.long	0x291
+	.uleb128 0xe
+	.long	.LASF47
+	.byte	0x7
+	.byte	0x1a
+	.byte	0xc
+	.long	0x65
+	.uleb128 0xc
+	.long	0x2d1
+	.long	0x2c6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0x7
+	.long	0x2bb
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x98
+	.uleb128 0x7
+	.long	0x2cb
+	.uleb128 0xe
+	.long	.LASF48
+	.byte	0x7
+	.byte	0x1b
+	.byte	0x1a
+	.long	0x2c6
+	.uleb128 0x10
+	.string	"sum"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x5
+	.long	0x65
+	.quad	.LFB11
+	.quad	.LFE11-.LFB11
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x34c
+	.uleb128 0x11
+	.string	"a"
+	.byte	0x1
+	.byte	0x4
+	.byte	0xe
+	.long	0x65
+	.long	.LLST0
+	.long	.LVUS0
+	.uleb128 0x11
+	.string	"b"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x15
+	.long	0x65
+	.long	.LLST1
+	.long	.LVUS1
+	.uleb128 0x12
+	.long	.LASF54
+	.byte	0x1
+	.byte	0x6
+	.byte	0x8
+	.long	0x34c
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.uleb128 0x13
+	.quad	.LVL2
+	.long	0x35c
+	.uleb128 0x14
+	.uleb128 0x1
+	.byte	0x55
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.long	0x91
+	.long	0x35c
+	.uleb128 0xd
+	.long	0x39
+	.byte	0x2
+	.byte	0
+	.uleb128 0x15
+	.long	.LASF55
+	.long	.LASF56
+	.byte	0x8
+	.byte	0
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x26
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x13
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x21
+	.byte	0
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x17
+	.uleb128 0x2137
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x4109
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x31
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x14
+	.uleb128 0x410a
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x18
+	.uleb128 0x2111
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x15
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.uleb128 0x6e
+	.uleb128 0xe
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_loc,"",@progbits
+.Ldebug_loc0:
+.LVUS0:
+	.uleb128 0
+	.uleb128 .LVU4
+	.uleb128 .LVU4
+	.uleb128 .LVU9
+	.uleb128 .LVU9
+	.uleb128 0
+.LLST0:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL1-.Ltext0
+	.value	0x1
+	.byte	0x55
+	.quad	.LVL1-.Ltext0
+	.quad	.LVL3-.Ltext0
+	.value	0x1
+	.byte	0x53
+	.quad	.LVL3-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x55
+	.byte	0x9f
+	.quad	0
+	.quad	0
+.LVUS1:
+	.uleb128 0
+	.uleb128 .LVU6
+	.uleb128 .LVU6
+	.uleb128 .LVU10
+	.uleb128 .LVU10
+	.uleb128 0
+.LLST1:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL2-1-.Ltext0
+	.value	0x1
+	.byte	0x54
+	.quad	.LVL2-1-.Ltext0
+	.quad	.LVL4-.Ltext0
+	.value	0x1
+	.byte	0x56
+	.quad	.LVL4-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x54
+	.byte	0x9f
+	.quad	0
+	.quad	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x2c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x8
+	.byte	0
+	.value	0
+	.value	0
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.quad	0
+	.quad	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF19:
+	.string	"_IO_buf_end"
+.LASF27:
+	.string	"_old_offset"
+.LASF56:
+	.string	"__builtin_puts"
+.LASF47:
+	.string	"sys_nerr"
+.LASF22:
+	.string	"_IO_save_end"
+.LASF5:
+	.string	"short int"
+.LASF7:
+	.string	"size_t"
+.LASF32:
+	.string	"_offset"
+.LASF49:
+	.string	"GNU C17 8.3.0 -mtune=generic -march=x86-64 -g2 -O"
+.LASF16:
+	.string	"_IO_write_ptr"
+.LASF11:
+	.string	"_flags"
+.LASF18:
+	.string	"_IO_buf_base"
+.LASF23:
+	.string	"_markers"
+.LASF13:
+	.string	"_IO_read_end"
+.LASF36:
+	.string	"_freeres_buf"
+.LASF54:
+	.string	"hello"
+.LASF50:
+	.string	"sum-04.c"
+.LASF46:
+	.string	"stderr"
+.LASF31:
+	.string	"_lock"
+.LASF6:
+	.string	"long int"
+.LASF28:
+	.string	"_cur_column"
+.LASF52:
+	.string	"_IO_FILE"
+.LASF51:
+	.string	"/home/peter/bo/2023ss/rtech/20230516"
+.LASF2:
+	.string	"unsigned char"
+.LASF4:
+	.string	"signed char"
+.LASF33:
+	.string	"_codecvt"
+.LASF1:
+	.string	"unsigned int"
+.LASF41:
+	.string	"_IO_marker"
+.LASF30:
+	.string	"_shortbuf"
+.LASF55:
+	.string	"puts"
+.LASF15:
+	.string	"_IO_write_base"
+.LASF39:
+	.string	"_unused2"
+.LASF12:
+	.string	"_IO_read_ptr"
+.LASF3:
+	.string	"short unsigned int"
+.LASF10:
+	.string	"char"
+.LASF34:
+	.string	"_wide_data"
+.LASF35:
+	.string	"_freeres_list"
+.LASF37:
+	.string	"__pad5"
+.LASF42:
+	.string	"_IO_codecvt"
+.LASF0:
+	.string	"long unsigned int"
+.LASF17:
+	.string	"_IO_write_end"
+.LASF9:
+	.string	"__off64_t"
+.LASF8:
+	.string	"__off_t"
+.LASF24:
+	.string	"_chain"
+.LASF43:
+	.string	"_IO_wide_data"
+.LASF21:
+	.string	"_IO_backup_base"
+.LASF44:
+	.string	"stdin"
+.LASF26:
+	.string	"_flags2"
+.LASF38:
+	.string	"_mode"
+.LASF14:
+	.string	"_IO_read_base"
+.LASF29:
+	.string	"_vtable_offset"
+.LASF20:
+	.string	"_IO_save_base"
+.LASF48:
+	.string	"sys_errlist"
+.LASF25:
+	.string	"_fileno"
+.LASF40:
+	.string	"FILE"
+.LASF45:
+	.string	"stdout"
+.LASF53:
+	.string	"_IO_lock_t"
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/20230516/sum-05.c b/20230516/sum-05.c
new file mode 100644
index 0000000000000000000000000000000000000000..8252afb12a3ed3d4717f4ff3225deacb91157ce3
--- /dev/null
+++ b/20230516/sum-05.c
@@ -0,0 +1,11 @@
+#include <stdio.h>
+#include <string.h>
+
+int sum (int a, int b)
+{
+  volatile char hello[3];
+  strcpy (hello, "Hello, world!");
+  hello[1] = 'a';
+  printf ("%s\n", hello);
+  return a + b;
+}
diff --git a/20230516/sum-06.c b/20230516/sum-06.c
new file mode 100644
index 0000000000000000000000000000000000000000..74b27698f870b295cfc1989415214ca6850c78de
--- /dev/null
+++ b/20230516/sum-06.c
@@ -0,0 +1,12 @@
+#include <stdio.h>
+#include <string.h>
+
+int sum (int a, int b)
+{
+  volatile char hello[3];
+  strcpy (hello, "Hello, world!");
+  hello[1] = 'a';
+  hello[12] = '?';
+  printf ("%s\n", hello);
+  return a + b;
+}
diff --git a/20230516/sum-06.s b/20230516/sum-06.s
new file mode 100644
index 0000000000000000000000000000000000000000..f3dd5ff832015385afbf9ac0aec3332f3708c3af
--- /dev/null
+++ b/20230516/sum-06.s
@@ -0,0 +1,977 @@
+	.file	"sum-06.c"
+	.text
+.Ltext0:
+	.globl	sum
+	.type	sum, @function
+sum:
+.LVL0:
+.LFB11:
+	.file 1 "sum-06.c"
+	.loc 1 5 1 view -0
+	.cfi_startproc
+	.loc 1 5 1 is_stmt 0 view .LVU1
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	pushq	%rbx
+	.cfi_def_cfa_offset 24
+	.cfi_offset 3, -24
+	subq	$24, %rsp
+	.cfi_def_cfa_offset 48
+	movl	%edi, %ebx
+	movl	%esi, %ebp
+	.loc 1 6 3 is_stmt 1 view .LVU2
+	.loc 1 7 3 view .LVU3
+	leaq	13(%rsp), %rdi
+.LVL1:
+	.loc 1 7 3 is_stmt 0 view .LVU4
+	movabsq	$8583909746840200520, %rax
+	movq	%rax, 13(%rsp)
+	movl	$1684828783, 21(%rsp)
+	movw	$33, 25(%rsp)
+	.loc 1 8 3 is_stmt 1 view .LVU5
+	.loc 1 8 12 is_stmt 0 view .LVU6
+	movb	$97, 14(%rsp)
+	.loc 1 9 3 is_stmt 1 view .LVU7
+	.loc 1 9 13 is_stmt 0 view .LVU8
+	movb	$63, 25(%rsp)
+	.loc 1 10 3 is_stmt 1 view .LVU9
+	call	puts@PLT
+.LVL2:
+	.loc 1 11 3 view .LVU10
+	.loc 1 11 12 is_stmt 0 view .LVU11
+	leal	(%rbx,%rbp), %eax
+	.loc 1 12 1 view .LVU12
+	addq	$24, %rsp
+	.cfi_def_cfa_offset 24
+	popq	%rbx
+	.cfi_def_cfa_offset 16
+.LVL3:
+	.loc 1 12 1 view .LVU13
+	popq	%rbp
+	.cfi_def_cfa_offset 8
+.LVL4:
+	.loc 1 12 1 view .LVU14
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	sum, .-sum
+.Letext0:
+	.file 2 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h"
+	.file 3 "/usr/include/x86_64-linux-gnu/bits/types.h"
+	.file 4 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h"
+	.file 5 "/usr/include/x86_64-linux-gnu/bits/types/FILE.h"
+	.file 6 "/usr/include/stdio.h"
+	.file 7 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h"
+	.file 8 "<built-in>"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x36e
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x8
+	.uleb128 0x1
+	.long	.LASF49
+	.byte	0xc
+	.long	.LASF50
+	.long	.LASF51
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.long	.LASF7
+	.byte	0x2
+	.byte	0xd8
+	.byte	0x17
+	.long	0x39
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x4
+	.byte	0x8
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF2
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF5
+	.uleb128 0x5
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x5
+	.long	.LASF6
+	.uleb128 0x2
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x96
+	.byte	0x19
+	.long	0x6c
+	.uleb128 0x2
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x97
+	.byte	0x1b
+	.long	0x6c
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x91
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF10
+	.uleb128 0x7
+	.long	0x91
+	.uleb128 0x8
+	.long	0x91
+	.uleb128 0x9
+	.long	.LASF52
+	.byte	0xd8
+	.byte	0x4
+	.byte	0x31
+	.byte	0x8
+	.long	0x229
+	.uleb128 0xa
+	.long	.LASF11
+	.byte	0x4
+	.byte	0x33
+	.byte	0x7
+	.long	0x65
+	.byte	0
+	.uleb128 0xa
+	.long	.LASF12
+	.byte	0x4
+	.byte	0x36
+	.byte	0x9
+	.long	0x8b
+	.byte	0x8
+	.uleb128 0xa
+	.long	.LASF13
+	.byte	0x4
+	.byte	0x37
+	.byte	0x9
+	.long	0x8b
+	.byte	0x10
+	.uleb128 0xa
+	.long	.LASF14
+	.byte	0x4
+	.byte	0x38
+	.byte	0x9
+	.long	0x8b
+	.byte	0x18
+	.uleb128 0xa
+	.long	.LASF15
+	.byte	0x4
+	.byte	0x39
+	.byte	0x9
+	.long	0x8b
+	.byte	0x20
+	.uleb128 0xa
+	.long	.LASF16
+	.byte	0x4
+	.byte	0x3a
+	.byte	0x9
+	.long	0x8b
+	.byte	0x28
+	.uleb128 0xa
+	.long	.LASF17
+	.byte	0x4
+	.byte	0x3b
+	.byte	0x9
+	.long	0x8b
+	.byte	0x30
+	.uleb128 0xa
+	.long	.LASF18
+	.byte	0x4
+	.byte	0x3c
+	.byte	0x9
+	.long	0x8b
+	.byte	0x38
+	.uleb128 0xa
+	.long	.LASF19
+	.byte	0x4
+	.byte	0x3d
+	.byte	0x9
+	.long	0x8b
+	.byte	0x40
+	.uleb128 0xa
+	.long	.LASF20
+	.byte	0x4
+	.byte	0x40
+	.byte	0x9
+	.long	0x8b
+	.byte	0x48
+	.uleb128 0xa
+	.long	.LASF21
+	.byte	0x4
+	.byte	0x41
+	.byte	0x9
+	.long	0x8b
+	.byte	0x50
+	.uleb128 0xa
+	.long	.LASF22
+	.byte	0x4
+	.byte	0x42
+	.byte	0x9
+	.long	0x8b
+	.byte	0x58
+	.uleb128 0xa
+	.long	.LASF23
+	.byte	0x4
+	.byte	0x44
+	.byte	0x16
+	.long	0x242
+	.byte	0x60
+	.uleb128 0xa
+	.long	.LASF24
+	.byte	0x4
+	.byte	0x46
+	.byte	0x14
+	.long	0x248
+	.byte	0x68
+	.uleb128 0xa
+	.long	.LASF25
+	.byte	0x4
+	.byte	0x48
+	.byte	0x7
+	.long	0x65
+	.byte	0x70
+	.uleb128 0xa
+	.long	.LASF26
+	.byte	0x4
+	.byte	0x49
+	.byte	0x7
+	.long	0x65
+	.byte	0x74
+	.uleb128 0xa
+	.long	.LASF27
+	.byte	0x4
+	.byte	0x4a
+	.byte	0xb
+	.long	0x73
+	.byte	0x78
+	.uleb128 0xa
+	.long	.LASF28
+	.byte	0x4
+	.byte	0x4d
+	.byte	0x12
+	.long	0x50
+	.byte	0x80
+	.uleb128 0xa
+	.long	.LASF29
+	.byte	0x4
+	.byte	0x4e
+	.byte	0xf
+	.long	0x57
+	.byte	0x82
+	.uleb128 0xa
+	.long	.LASF30
+	.byte	0x4
+	.byte	0x4f
+	.byte	0x8
+	.long	0x24e
+	.byte	0x83
+	.uleb128 0xa
+	.long	.LASF31
+	.byte	0x4
+	.byte	0x51
+	.byte	0xf
+	.long	0x25e
+	.byte	0x88
+	.uleb128 0xa
+	.long	.LASF32
+	.byte	0x4
+	.byte	0x59
+	.byte	0xd
+	.long	0x7f
+	.byte	0x90
+	.uleb128 0xa
+	.long	.LASF33
+	.byte	0x4
+	.byte	0x5b
+	.byte	0x17
+	.long	0x269
+	.byte	0x98
+	.uleb128 0xa
+	.long	.LASF34
+	.byte	0x4
+	.byte	0x5c
+	.byte	0x19
+	.long	0x274
+	.byte	0xa0
+	.uleb128 0xa
+	.long	.LASF35
+	.byte	0x4
+	.byte	0x5d
+	.byte	0x14
+	.long	0x248
+	.byte	0xa8
+	.uleb128 0xa
+	.long	.LASF36
+	.byte	0x4
+	.byte	0x5e
+	.byte	0x9
+	.long	0x47
+	.byte	0xb0
+	.uleb128 0xa
+	.long	.LASF37
+	.byte	0x4
+	.byte	0x5f
+	.byte	0xa
+	.long	0x2d
+	.byte	0xb8
+	.uleb128 0xa
+	.long	.LASF38
+	.byte	0x4
+	.byte	0x60
+	.byte	0x7
+	.long	0x65
+	.byte	0xc0
+	.uleb128 0xa
+	.long	.LASF39
+	.byte	0x4
+	.byte	0x62
+	.byte	0x8
+	.long	0x27a
+	.byte	0xc4
+	.byte	0
+	.uleb128 0x2
+	.long	.LASF40
+	.byte	0x5
+	.byte	0x7
+	.byte	0x19
+	.long	0xa2
+	.uleb128 0xb
+	.long	.LASF53
+	.byte	0x4
+	.byte	0x2b
+	.byte	0xe
+	.uleb128 0xc
+	.long	.LASF41
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x23d
+	.uleb128 0x6
+	.byte	0x8
+	.long	0xa2
+	.uleb128 0xd
+	.long	0x91
+	.long	0x25e
+	.uleb128 0xe
+	.long	0x39
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x235
+	.uleb128 0xc
+	.long	.LASF42
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x264
+	.uleb128 0xc
+	.long	.LASF43
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x26f
+	.uleb128 0xd
+	.long	0x91
+	.long	0x28a
+	.uleb128 0xe
+	.long	0x39
+	.byte	0x13
+	.byte	0
+	.uleb128 0xf
+	.long	.LASF44
+	.byte	0x6
+	.byte	0x89
+	.byte	0xe
+	.long	0x296
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x229
+	.uleb128 0xf
+	.long	.LASF45
+	.byte	0x6
+	.byte	0x8a
+	.byte	0xe
+	.long	0x296
+	.uleb128 0xf
+	.long	.LASF46
+	.byte	0x6
+	.byte	0x8b
+	.byte	0xe
+	.long	0x296
+	.uleb128 0xf
+	.long	.LASF47
+	.byte	0x7
+	.byte	0x1a
+	.byte	0xc
+	.long	0x65
+	.uleb128 0xd
+	.long	0x2d6
+	.long	0x2cb
+	.uleb128 0x10
+	.byte	0
+	.uleb128 0x7
+	.long	0x2c0
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x98
+	.uleb128 0x7
+	.long	0x2d0
+	.uleb128 0xf
+	.long	.LASF48
+	.byte	0x7
+	.byte	0x1b
+	.byte	0x1a
+	.long	0x2cb
+	.uleb128 0x11
+	.string	"sum"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x5
+	.long	0x65
+	.quad	.LFB11
+	.quad	.LFE11-.LFB11
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x351
+	.uleb128 0x12
+	.string	"a"
+	.byte	0x1
+	.byte	0x4
+	.byte	0xe
+	.long	0x65
+	.long	.LLST0
+	.long	.LVUS0
+	.uleb128 0x12
+	.string	"b"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x15
+	.long	0x65
+	.long	.LLST1
+	.long	.LVUS1
+	.uleb128 0x13
+	.long	.LASF54
+	.byte	0x1
+	.byte	0x6
+	.byte	0x11
+	.long	0x361
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.uleb128 0x14
+	.quad	.LVL2
+	.long	0x366
+	.uleb128 0x15
+	.uleb128 0x1
+	.byte	0x55
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.long	0x9d
+	.long	0x361
+	.uleb128 0xe
+	.long	0x39
+	.byte	0x2
+	.byte	0
+	.uleb128 0x8
+	.long	0x351
+	.uleb128 0x16
+	.long	.LASF55
+	.long	.LASF56
+	.byte	0x8
+	.byte	0
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x26
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x35
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x13
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x21
+	.byte	0
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x17
+	.uleb128 0x2137
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x14
+	.uleb128 0x4109
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x31
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x15
+	.uleb128 0x410a
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x18
+	.uleb128 0x2111
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x16
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.uleb128 0x6e
+	.uleb128 0xe
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_loc,"",@progbits
+.Ldebug_loc0:
+.LVUS0:
+	.uleb128 0
+	.uleb128 .LVU4
+	.uleb128 .LVU4
+	.uleb128 .LVU13
+	.uleb128 .LVU13
+	.uleb128 0
+.LLST0:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL1-.Ltext0
+	.value	0x1
+	.byte	0x55
+	.quad	.LVL1-.Ltext0
+	.quad	.LVL3-.Ltext0
+	.value	0x1
+	.byte	0x53
+	.quad	.LVL3-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x55
+	.byte	0x9f
+	.quad	0
+	.quad	0
+.LVUS1:
+	.uleb128 0
+	.uleb128 .LVU10
+	.uleb128 .LVU10
+	.uleb128 .LVU14
+	.uleb128 .LVU14
+	.uleb128 0
+.LLST1:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL2-1-.Ltext0
+	.value	0x1
+	.byte	0x54
+	.quad	.LVL2-1-.Ltext0
+	.quad	.LVL4-.Ltext0
+	.value	0x1
+	.byte	0x56
+	.quad	.LVL4-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x54
+	.byte	0x9f
+	.quad	0
+	.quad	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x2c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x8
+	.byte	0
+	.value	0
+	.value	0
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.quad	0
+	.quad	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF19:
+	.string	"_IO_buf_end"
+.LASF27:
+	.string	"_old_offset"
+.LASF56:
+	.string	"__builtin_puts"
+.LASF50:
+	.string	"sum-06.c"
+.LASF47:
+	.string	"sys_nerr"
+.LASF22:
+	.string	"_IO_save_end"
+.LASF5:
+	.string	"short int"
+.LASF7:
+	.string	"size_t"
+.LASF32:
+	.string	"_offset"
+.LASF49:
+	.string	"GNU C17 8.3.0 -mtune=generic -march=x86-64 -g2 -O"
+.LASF16:
+	.string	"_IO_write_ptr"
+.LASF11:
+	.string	"_flags"
+.LASF18:
+	.string	"_IO_buf_base"
+.LASF23:
+	.string	"_markers"
+.LASF13:
+	.string	"_IO_read_end"
+.LASF36:
+	.string	"_freeres_buf"
+.LASF54:
+	.string	"hello"
+.LASF46:
+	.string	"stderr"
+.LASF31:
+	.string	"_lock"
+.LASF6:
+	.string	"long int"
+.LASF28:
+	.string	"_cur_column"
+.LASF52:
+	.string	"_IO_FILE"
+.LASF51:
+	.string	"/home/peter/bo/2023ss/rtech/20230516"
+.LASF2:
+	.string	"unsigned char"
+.LASF4:
+	.string	"signed char"
+.LASF33:
+	.string	"_codecvt"
+.LASF1:
+	.string	"unsigned int"
+.LASF41:
+	.string	"_IO_marker"
+.LASF30:
+	.string	"_shortbuf"
+.LASF55:
+	.string	"puts"
+.LASF15:
+	.string	"_IO_write_base"
+.LASF39:
+	.string	"_unused2"
+.LASF12:
+	.string	"_IO_read_ptr"
+.LASF3:
+	.string	"short unsigned int"
+.LASF10:
+	.string	"char"
+.LASF34:
+	.string	"_wide_data"
+.LASF35:
+	.string	"_freeres_list"
+.LASF37:
+	.string	"__pad5"
+.LASF42:
+	.string	"_IO_codecvt"
+.LASF0:
+	.string	"long unsigned int"
+.LASF17:
+	.string	"_IO_write_end"
+.LASF9:
+	.string	"__off64_t"
+.LASF8:
+	.string	"__off_t"
+.LASF24:
+	.string	"_chain"
+.LASF43:
+	.string	"_IO_wide_data"
+.LASF21:
+	.string	"_IO_backup_base"
+.LASF44:
+	.string	"stdin"
+.LASF26:
+	.string	"_flags2"
+.LASF38:
+	.string	"_mode"
+.LASF14:
+	.string	"_IO_read_base"
+.LASF29:
+	.string	"_vtable_offset"
+.LASF20:
+	.string	"_IO_save_base"
+.LASF48:
+	.string	"sys_errlist"
+.LASF25:
+	.string	"_fileno"
+.LASF40:
+	.string	"FILE"
+.LASF45:
+	.string	"stdout"
+.LASF53:
+	.string	"_IO_lock_t"
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits
diff --git a/20230516/sum-07.c b/20230516/sum-07.c
new file mode 100644
index 0000000000000000000000000000000000000000..08f4fb006261bbae452dc6050518697d9dfc5c5e
--- /dev/null
+++ b/20230516/sum-07.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <string.h>
+
+int sum (int a, int b)
+{
+  volatile char hello[3];
+  strcpy (hello, "Hello, world!");
+  hello[1] = 'a';
+  hello[12] = '?';
+  for (int i = 14; i < 50; i++)
+    hello[i] = '!';
+  printf ("%s\n", hello);
+  return a + b;
+}
diff --git a/20230516/sum-07.s b/20230516/sum-07.s
new file mode 100644
index 0000000000000000000000000000000000000000..093773b1e0966227f440fa2863833a1fb5318a14
--- /dev/null
+++ b/20230516/sum-07.s
@@ -0,0 +1,1056 @@
+	.file	"sum-07.c"
+	.text
+.Ltext0:
+	.globl	sum
+	.type	sum, @function
+sum:
+.LVL0:
+.LFB11:
+	.file 1 "sum-07.c"
+	.loc 1 5 1 view -0
+	.cfi_startproc
+	.loc 1 5 1 is_stmt 0 view .LVU1
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset 6, -16
+	pushq	%rbx
+	.cfi_def_cfa_offset 24
+	.cfi_offset 3, -24
+	subq	$24, %rsp
+	.cfi_def_cfa_offset 48
+	movl	%edi, %ebx
+	movl	%esi, %ebp
+	.loc 1 6 3 is_stmt 1 view .LVU2
+	.loc 1 7 3 view .LVU3
+	movabsq	$8583909746840200520, %rax
+	movq	%rax, 13(%rsp)
+	movl	$1684828783, 21(%rsp)
+	movw	$33, 25(%rsp)
+	.loc 1 8 3 view .LVU4
+	.loc 1 8 12 is_stmt 0 view .LVU5
+	movb	$97, 14(%rsp)
+	.loc 1 9 3 is_stmt 1 view .LVU6
+	.loc 1 9 13 is_stmt 0 view .LVU7
+	movb	$63, 25(%rsp)
+	.loc 1 10 3 is_stmt 1 view .LVU8
+.LBB2:
+	.loc 1 10 8 view .LVU9
+.LVL1:
+	.loc 1 10 12 is_stmt 0 view .LVU10
+	movl	$14, %edx
+.LVL2:
+.L2:
+	.loc 1 11 5 is_stmt 1 discriminator 3 view .LVU11
+	.loc 1 11 14 is_stmt 0 discriminator 3 view .LVU12
+	movslq	%edx, %rcx
+	movb	$33, 13(%rsp,%rcx)
+	.loc 1 10 29 discriminator 3 view .LVU13
+	addl	$1, %edx
+.LVL3:
+	.loc 1 10 3 discriminator 3 view .LVU14
+	cmpl	$50, %edx
+	jne	.L2
+.LBE2:
+	.loc 1 12 3 is_stmt 1 view .LVU15
+	leaq	13(%rsp), %rdi
+.LVL4:
+	.loc 1 12 3 is_stmt 0 view .LVU16
+	call	puts@PLT
+.LVL5:
+	.loc 1 13 3 is_stmt 1 view .LVU17
+	.loc 1 13 12 is_stmt 0 view .LVU18
+	leal	(%rbx,%rbp), %eax
+	.loc 1 14 1 view .LVU19
+	addq	$24, %rsp
+	.cfi_def_cfa_offset 24
+	popq	%rbx
+	.cfi_def_cfa_offset 16
+.LVL6:
+	.loc 1 14 1 view .LVU20
+	popq	%rbp
+	.cfi_def_cfa_offset 8
+.LVL7:
+	.loc 1 14 1 view .LVU21
+	ret
+	.cfi_endproc
+.LFE11:
+	.size	sum, .-sum
+.Letext0:
+	.file 2 "/usr/lib/gcc/x86_64-linux-gnu/8/include/stddef.h"
+	.file 3 "/usr/include/x86_64-linux-gnu/bits/types.h"
+	.file 4 "/usr/include/x86_64-linux-gnu/bits/types/struct_FILE.h"
+	.file 5 "/usr/include/x86_64-linux-gnu/bits/types/FILE.h"
+	.file 6 "/usr/include/stdio.h"
+	.file 7 "/usr/include/x86_64-linux-gnu/bits/sys_errlist.h"
+	.file 8 "<built-in>"
+	.section	.debug_info,"",@progbits
+.Ldebug_info0:
+	.long	0x396
+	.value	0x4
+	.long	.Ldebug_abbrev0
+	.byte	0x8
+	.uleb128 0x1
+	.long	.LASF49
+	.byte	0xc
+	.long	.LASF50
+	.long	.LASF51
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.long	.Ldebug_line0
+	.uleb128 0x2
+	.long	.LASF7
+	.byte	0x2
+	.byte	0xd8
+	.byte	0x17
+	.long	0x39
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x7
+	.long	.LASF0
+	.uleb128 0x3
+	.byte	0x4
+	.byte	0x7
+	.long	.LASF1
+	.uleb128 0x4
+	.byte	0x8
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x8
+	.long	.LASF2
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x7
+	.long	.LASF3
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF4
+	.uleb128 0x3
+	.byte	0x2
+	.byte	0x5
+	.long	.LASF5
+	.uleb128 0x5
+	.byte	0x4
+	.byte	0x5
+	.string	"int"
+	.uleb128 0x3
+	.byte	0x8
+	.byte	0x5
+	.long	.LASF6
+	.uleb128 0x2
+	.long	.LASF8
+	.byte	0x3
+	.byte	0x96
+	.byte	0x19
+	.long	0x6c
+	.uleb128 0x2
+	.long	.LASF9
+	.byte	0x3
+	.byte	0x97
+	.byte	0x1b
+	.long	0x6c
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x91
+	.uleb128 0x3
+	.byte	0x1
+	.byte	0x6
+	.long	.LASF10
+	.uleb128 0x7
+	.long	0x91
+	.uleb128 0x8
+	.long	0x91
+	.uleb128 0x9
+	.long	.LASF52
+	.byte	0xd8
+	.byte	0x4
+	.byte	0x31
+	.byte	0x8
+	.long	0x229
+	.uleb128 0xa
+	.long	.LASF11
+	.byte	0x4
+	.byte	0x33
+	.byte	0x7
+	.long	0x65
+	.byte	0
+	.uleb128 0xa
+	.long	.LASF12
+	.byte	0x4
+	.byte	0x36
+	.byte	0x9
+	.long	0x8b
+	.byte	0x8
+	.uleb128 0xa
+	.long	.LASF13
+	.byte	0x4
+	.byte	0x37
+	.byte	0x9
+	.long	0x8b
+	.byte	0x10
+	.uleb128 0xa
+	.long	.LASF14
+	.byte	0x4
+	.byte	0x38
+	.byte	0x9
+	.long	0x8b
+	.byte	0x18
+	.uleb128 0xa
+	.long	.LASF15
+	.byte	0x4
+	.byte	0x39
+	.byte	0x9
+	.long	0x8b
+	.byte	0x20
+	.uleb128 0xa
+	.long	.LASF16
+	.byte	0x4
+	.byte	0x3a
+	.byte	0x9
+	.long	0x8b
+	.byte	0x28
+	.uleb128 0xa
+	.long	.LASF17
+	.byte	0x4
+	.byte	0x3b
+	.byte	0x9
+	.long	0x8b
+	.byte	0x30
+	.uleb128 0xa
+	.long	.LASF18
+	.byte	0x4
+	.byte	0x3c
+	.byte	0x9
+	.long	0x8b
+	.byte	0x38
+	.uleb128 0xa
+	.long	.LASF19
+	.byte	0x4
+	.byte	0x3d
+	.byte	0x9
+	.long	0x8b
+	.byte	0x40
+	.uleb128 0xa
+	.long	.LASF20
+	.byte	0x4
+	.byte	0x40
+	.byte	0x9
+	.long	0x8b
+	.byte	0x48
+	.uleb128 0xa
+	.long	.LASF21
+	.byte	0x4
+	.byte	0x41
+	.byte	0x9
+	.long	0x8b
+	.byte	0x50
+	.uleb128 0xa
+	.long	.LASF22
+	.byte	0x4
+	.byte	0x42
+	.byte	0x9
+	.long	0x8b
+	.byte	0x58
+	.uleb128 0xa
+	.long	.LASF23
+	.byte	0x4
+	.byte	0x44
+	.byte	0x16
+	.long	0x242
+	.byte	0x60
+	.uleb128 0xa
+	.long	.LASF24
+	.byte	0x4
+	.byte	0x46
+	.byte	0x14
+	.long	0x248
+	.byte	0x68
+	.uleb128 0xa
+	.long	.LASF25
+	.byte	0x4
+	.byte	0x48
+	.byte	0x7
+	.long	0x65
+	.byte	0x70
+	.uleb128 0xa
+	.long	.LASF26
+	.byte	0x4
+	.byte	0x49
+	.byte	0x7
+	.long	0x65
+	.byte	0x74
+	.uleb128 0xa
+	.long	.LASF27
+	.byte	0x4
+	.byte	0x4a
+	.byte	0xb
+	.long	0x73
+	.byte	0x78
+	.uleb128 0xa
+	.long	.LASF28
+	.byte	0x4
+	.byte	0x4d
+	.byte	0x12
+	.long	0x50
+	.byte	0x80
+	.uleb128 0xa
+	.long	.LASF29
+	.byte	0x4
+	.byte	0x4e
+	.byte	0xf
+	.long	0x57
+	.byte	0x82
+	.uleb128 0xa
+	.long	.LASF30
+	.byte	0x4
+	.byte	0x4f
+	.byte	0x8
+	.long	0x24e
+	.byte	0x83
+	.uleb128 0xa
+	.long	.LASF31
+	.byte	0x4
+	.byte	0x51
+	.byte	0xf
+	.long	0x25e
+	.byte	0x88
+	.uleb128 0xa
+	.long	.LASF32
+	.byte	0x4
+	.byte	0x59
+	.byte	0xd
+	.long	0x7f
+	.byte	0x90
+	.uleb128 0xa
+	.long	.LASF33
+	.byte	0x4
+	.byte	0x5b
+	.byte	0x17
+	.long	0x269
+	.byte	0x98
+	.uleb128 0xa
+	.long	.LASF34
+	.byte	0x4
+	.byte	0x5c
+	.byte	0x19
+	.long	0x274
+	.byte	0xa0
+	.uleb128 0xa
+	.long	.LASF35
+	.byte	0x4
+	.byte	0x5d
+	.byte	0x14
+	.long	0x248
+	.byte	0xa8
+	.uleb128 0xa
+	.long	.LASF36
+	.byte	0x4
+	.byte	0x5e
+	.byte	0x9
+	.long	0x47
+	.byte	0xb0
+	.uleb128 0xa
+	.long	.LASF37
+	.byte	0x4
+	.byte	0x5f
+	.byte	0xa
+	.long	0x2d
+	.byte	0xb8
+	.uleb128 0xa
+	.long	.LASF38
+	.byte	0x4
+	.byte	0x60
+	.byte	0x7
+	.long	0x65
+	.byte	0xc0
+	.uleb128 0xa
+	.long	.LASF39
+	.byte	0x4
+	.byte	0x62
+	.byte	0x8
+	.long	0x27a
+	.byte	0xc4
+	.byte	0
+	.uleb128 0x2
+	.long	.LASF40
+	.byte	0x5
+	.byte	0x7
+	.byte	0x19
+	.long	0xa2
+	.uleb128 0xb
+	.long	.LASF53
+	.byte	0x4
+	.byte	0x2b
+	.byte	0xe
+	.uleb128 0xc
+	.long	.LASF41
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x23d
+	.uleb128 0x6
+	.byte	0x8
+	.long	0xa2
+	.uleb128 0xd
+	.long	0x91
+	.long	0x25e
+	.uleb128 0xe
+	.long	0x39
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x235
+	.uleb128 0xc
+	.long	.LASF42
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x264
+	.uleb128 0xc
+	.long	.LASF43
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x26f
+	.uleb128 0xd
+	.long	0x91
+	.long	0x28a
+	.uleb128 0xe
+	.long	0x39
+	.byte	0x13
+	.byte	0
+	.uleb128 0xf
+	.long	.LASF44
+	.byte	0x6
+	.byte	0x89
+	.byte	0xe
+	.long	0x296
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x229
+	.uleb128 0xf
+	.long	.LASF45
+	.byte	0x6
+	.byte	0x8a
+	.byte	0xe
+	.long	0x296
+	.uleb128 0xf
+	.long	.LASF46
+	.byte	0x6
+	.byte	0x8b
+	.byte	0xe
+	.long	0x296
+	.uleb128 0xf
+	.long	.LASF47
+	.byte	0x7
+	.byte	0x1a
+	.byte	0xc
+	.long	0x65
+	.uleb128 0xd
+	.long	0x2d6
+	.long	0x2cb
+	.uleb128 0x10
+	.byte	0
+	.uleb128 0x7
+	.long	0x2c0
+	.uleb128 0x6
+	.byte	0x8
+	.long	0x98
+	.uleb128 0x7
+	.long	0x2d0
+	.uleb128 0xf
+	.long	.LASF48
+	.byte	0x7
+	.byte	0x1b
+	.byte	0x1a
+	.long	0x2cb
+	.uleb128 0x11
+	.string	"sum"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x5
+	.long	0x65
+	.quad	.LFB11
+	.quad	.LFE11-.LFB11
+	.uleb128 0x1
+	.byte	0x9c
+	.long	0x379
+	.uleb128 0x12
+	.string	"a"
+	.byte	0x1
+	.byte	0x4
+	.byte	0xe
+	.long	0x65
+	.long	.LLST0
+	.long	.LVUS0
+	.uleb128 0x12
+	.string	"b"
+	.byte	0x1
+	.byte	0x4
+	.byte	0x15
+	.long	0x65
+	.long	.LLST1
+	.long	.LVUS1
+	.uleb128 0x13
+	.long	.LASF54
+	.byte	0x1
+	.byte	0x6
+	.byte	0x11
+	.long	0x389
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.uleb128 0x14
+	.quad	.LBB2
+	.quad	.LBE2-.LBB2
+	.long	0x364
+	.uleb128 0x15
+	.string	"i"
+	.byte	0x1
+	.byte	0xa
+	.byte	0xc
+	.long	0x65
+	.long	.LLST2
+	.long	.LVUS2
+	.byte	0
+	.uleb128 0x16
+	.quad	.LVL5
+	.long	0x38e
+	.uleb128 0x17
+	.uleb128 0x1
+	.byte	0x55
+	.uleb128 0x2
+	.byte	0x91
+	.sleb128 -35
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.long	0x9d
+	.long	0x389
+	.uleb128 0xe
+	.long	0x39
+	.byte	0x2
+	.byte	0
+	.uleb128 0x8
+	.long	0x379
+	.uleb128 0x18
+	.long	.LASF55
+	.long	.LASF56
+	.byte	0x8
+	.byte	0
+	.byte	0
+	.section	.debug_abbrev,"",@progbits
+.Ldebug_abbrev0:
+	.uleb128 0x1
+	.uleb128 0x11
+	.byte	0x1
+	.uleb128 0x25
+	.uleb128 0xe
+	.uleb128 0x13
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x1b
+	.uleb128 0xe
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x10
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0xe
+	.byte	0
+	.byte	0
+	.uleb128 0x4
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0x5
+	.uleb128 0x24
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3e
+	.uleb128 0xb
+	.uleb128 0x3
+	.uleb128 0x8
+	.byte	0
+	.byte	0
+	.uleb128 0x6
+	.uleb128 0xf
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x7
+	.uleb128 0x26
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x8
+	.uleb128 0x35
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x9
+	.uleb128 0x13
+	.byte	0x1
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0xb
+	.uleb128 0xb
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xa
+	.uleb128 0xd
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x38
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xb
+	.uleb128 0x16
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xc
+	.uleb128 0x13
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0xd
+	.uleb128 0x1
+	.byte	0x1
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0xe
+	.uleb128 0x21
+	.byte	0
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2f
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.uleb128 0xf
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.byte	0
+	.byte	0
+	.uleb128 0x10
+	.uleb128 0x21
+	.byte	0
+	.byte	0
+	.byte	0
+	.uleb128 0x11
+	.uleb128 0x2e
+	.byte	0x1
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x27
+	.uleb128 0x19
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x40
+	.uleb128 0x18
+	.uleb128 0x2117
+	.uleb128 0x19
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x12
+	.uleb128 0x5
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x17
+	.uleb128 0x2137
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x13
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x14
+	.uleb128 0xb
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x12
+	.uleb128 0x7
+	.uleb128 0x1
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x15
+	.uleb128 0x34
+	.byte	0
+	.uleb128 0x3
+	.uleb128 0x8
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.uleb128 0x39
+	.uleb128 0xb
+	.uleb128 0x49
+	.uleb128 0x13
+	.uleb128 0x2
+	.uleb128 0x17
+	.uleb128 0x2137
+	.uleb128 0x17
+	.byte	0
+	.byte	0
+	.uleb128 0x16
+	.uleb128 0x4109
+	.byte	0x1
+	.uleb128 0x11
+	.uleb128 0x1
+	.uleb128 0x31
+	.uleb128 0x13
+	.byte	0
+	.byte	0
+	.uleb128 0x17
+	.uleb128 0x410a
+	.byte	0
+	.uleb128 0x2
+	.uleb128 0x18
+	.uleb128 0x2111
+	.uleb128 0x18
+	.byte	0
+	.byte	0
+	.uleb128 0x18
+	.uleb128 0x2e
+	.byte	0
+	.uleb128 0x3f
+	.uleb128 0x19
+	.uleb128 0x3c
+	.uleb128 0x19
+	.uleb128 0x6e
+	.uleb128 0xe
+	.uleb128 0x3
+	.uleb128 0xe
+	.uleb128 0x3a
+	.uleb128 0xb
+	.uleb128 0x3b
+	.uleb128 0xb
+	.byte	0
+	.byte	0
+	.byte	0
+	.section	.debug_loc,"",@progbits
+.Ldebug_loc0:
+.LVUS0:
+	.uleb128 0
+	.uleb128 .LVU16
+	.uleb128 .LVU16
+	.uleb128 .LVU20
+	.uleb128 .LVU20
+	.uleb128 0
+.LLST0:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL4-.Ltext0
+	.value	0x1
+	.byte	0x55
+	.quad	.LVL4-.Ltext0
+	.quad	.LVL6-.Ltext0
+	.value	0x1
+	.byte	0x53
+	.quad	.LVL6-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x55
+	.byte	0x9f
+	.quad	0
+	.quad	0
+.LVUS1:
+	.uleb128 0
+	.uleb128 .LVU17
+	.uleb128 .LVU17
+	.uleb128 .LVU21
+	.uleb128 .LVU21
+	.uleb128 0
+.LLST1:
+	.quad	.LVL0-.Ltext0
+	.quad	.LVL5-1-.Ltext0
+	.value	0x1
+	.byte	0x54
+	.quad	.LVL5-1-.Ltext0
+	.quad	.LVL7-.Ltext0
+	.value	0x1
+	.byte	0x56
+	.quad	.LVL7-.Ltext0
+	.quad	.LFE11-.Ltext0
+	.value	0x4
+	.byte	0xf3
+	.uleb128 0x1
+	.byte	0x54
+	.byte	0x9f
+	.quad	0
+	.quad	0
+.LVUS2:
+	.uleb128 .LVU10
+	.uleb128 .LVU11
+	.uleb128 .LVU11
+	.uleb128 .LVU17
+.LLST2:
+	.quad	.LVL1-.Ltext0
+	.quad	.LVL2-.Ltext0
+	.value	0x2
+	.byte	0x3e
+	.byte	0x9f
+	.quad	.LVL2-.Ltext0
+	.quad	.LVL5-1-.Ltext0
+	.value	0x1
+	.byte	0x51
+	.quad	0
+	.quad	0
+	.section	.debug_aranges,"",@progbits
+	.long	0x2c
+	.value	0x2
+	.long	.Ldebug_info0
+	.byte	0x8
+	.byte	0
+	.value	0
+	.value	0
+	.quad	.Ltext0
+	.quad	.Letext0-.Ltext0
+	.quad	0
+	.quad	0
+	.section	.debug_line,"",@progbits
+.Ldebug_line0:
+	.section	.debug_str,"MS",@progbits,1
+.LASF19:
+	.string	"_IO_buf_end"
+.LASF27:
+	.string	"_old_offset"
+.LASF56:
+	.string	"__builtin_puts"
+.LASF47:
+	.string	"sys_nerr"
+.LASF22:
+	.string	"_IO_save_end"
+.LASF5:
+	.string	"short int"
+.LASF7:
+	.string	"size_t"
+.LASF32:
+	.string	"_offset"
+.LASF49:
+	.string	"GNU C17 8.3.0 -mtune=generic -march=x86-64 -g2 -O"
+.LASF16:
+	.string	"_IO_write_ptr"
+.LASF11:
+	.string	"_flags"
+.LASF18:
+	.string	"_IO_buf_base"
+.LASF23:
+	.string	"_markers"
+.LASF13:
+	.string	"_IO_read_end"
+.LASF36:
+	.string	"_freeres_buf"
+.LASF54:
+	.string	"hello"
+.LASF46:
+	.string	"stderr"
+.LASF31:
+	.string	"_lock"
+.LASF6:
+	.string	"long int"
+.LASF28:
+	.string	"_cur_column"
+.LASF52:
+	.string	"_IO_FILE"
+.LASF51:
+	.string	"/home/peter/bo/2023ss/rtech/20230516"
+.LASF2:
+	.string	"unsigned char"
+.LASF4:
+	.string	"signed char"
+.LASF33:
+	.string	"_codecvt"
+.LASF1:
+	.string	"unsigned int"
+.LASF41:
+	.string	"_IO_marker"
+.LASF30:
+	.string	"_shortbuf"
+.LASF55:
+	.string	"puts"
+.LASF15:
+	.string	"_IO_write_base"
+.LASF39:
+	.string	"_unused2"
+.LASF12:
+	.string	"_IO_read_ptr"
+.LASF3:
+	.string	"short unsigned int"
+.LASF10:
+	.string	"char"
+.LASF34:
+	.string	"_wide_data"
+.LASF35:
+	.string	"_freeres_list"
+.LASF37:
+	.string	"__pad5"
+.LASF42:
+	.string	"_IO_codecvt"
+.LASF0:
+	.string	"long unsigned int"
+.LASF17:
+	.string	"_IO_write_end"
+.LASF9:
+	.string	"__off64_t"
+.LASF8:
+	.string	"__off_t"
+.LASF24:
+	.string	"_chain"
+.LASF43:
+	.string	"_IO_wide_data"
+.LASF21:
+	.string	"_IO_backup_base"
+.LASF44:
+	.string	"stdin"
+.LASF26:
+	.string	"_flags2"
+.LASF38:
+	.string	"_mode"
+.LASF14:
+	.string	"_IO_read_base"
+.LASF29:
+	.string	"_vtable_offset"
+.LASF20:
+	.string	"_IO_save_base"
+.LASF48:
+	.string	"sys_errlist"
+.LASF25:
+	.string	"_fileno"
+.LASF40:
+	.string	"FILE"
+.LASF50:
+	.string	"sum-07.c"
+.LASF45:
+	.string	"stdout"
+.LASF53:
+	.string	"_IO_lock_t"
+	.ident	"GCC: (Debian 8.3.0-6) 8.3.0"
+	.section	.note.GNU-stack,"",@progbits