[Bug gdb/23188] Process record does not support instruction 0xc5 (vmovd %esi,%xmm0 / AVX2)

["jengelh at inai dot de" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23188

Jan Engelhardt <jengelh at inai dot de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jengelh at inai dot de

--- Comment #3 from Jan Engelhardt <jengelh at inai dot de> ---
---
#include <string.h>
int main(int argc, char **argv)
{
        return strcasecmp(argv[0], "foooooooooooooooooooooooooooobaaaar") == 0;
}
---

(gcc 7.4.0)
$ gcc-7 t.c -ggdb3
$ gdb a.out 
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Reading symbols from a.out...done.
(gdb) b main
Breakpoint 1 at 0x401126: file t.c, line 4.
(gdb) r
Starting program: a.out 

Breakpoint 1, main (argc=1, argv=0x7fffffffde68) at t.c:4
4               return strcasecmp(argv[0],
"foooooooooooooooooooooooooooobaaaar") == 0;
(gdb) record
(gdb) c
Continuing.
Process record does not support instruction 0xc5 at address 0x7ffff7b7134f.

[1]+  Stopped                 gdb a.out
$ fg
gdb a.out
Process record: failed to record execution log.

Program stopped.
__strcasecmp_l_avx () at ../sysdeps/x86_64/multiarch/strcmp-sse42.S:187
187             movdqa  LABEL(belowupper)(%rip), %xmm4
(gdb) disas
Dump of assembler code for function __strcasecmp_l_avx:
   0x00007ffff7b71330 <+0>:     mov    (%rdx),%rax
   0x00007ffff7b71333 <+3>:     testl  $0x1,0x278(%rax)
   0x00007ffff7b7133d <+13>:    jne    0x7ffff7abaca0 <__strcasecmp_l_nonascii>
   0x00007ffff7b71343 <+19>:    mov    %esi,%ecx
   0x00007ffff7b71345 <+21>:    mov    %edi,%eax
   0x00007ffff7b71347 <+23>:    and    $0x3f,%rcx
   0x00007ffff7b7134b <+27>:    and    $0x3f,%rax
=> 0x00007ffff7b7134f <+31>:    vmovdqa 0x2f649(%rip),%xmm4        #
0x7ffff7ba09a0
   0x00007ffff7b71357 <+39>:    vmovdqa 0x2f661(%rip),%xmm5        #
0x7ffff7ba09c0
   0x00007ffff7b7135f <+47>:    vmovdqa 0x2f629(%rip),%xmm6        #
0x7ffff7ba0990 <blanks>
   0x00007ffff7b71367 <+55>:    cmp    $0x30,%ecx
   0x00007ffff7b7136a <+58>:    ja     0x7ffff7b713d0 <__strcasecmp_l_avx+160>
   0x00007ffff7b7136c <+60>:    cmp    $0x30,%eax
   0x00007ffff7b7136f <+63>:    ja     0x7ffff7b713d0 <__strcasecmp_l_avx+160>
   0x00007ffff7b71371 <+65>:    vmovdqu (%rdi),%xmm1
   0x00007ffff7b71375 <+69>:    vmovdqu (%rsi),%xmm2
   0x00007ffff7b71379 <+73>:    vpcmpgtb %xmm4,%xmm1,%xmm7
   0x00007ffff7b7137d <+77>:    vpcmpgtb %xmm5,%xmm1,%xmm8
   0x00007ffff7b71381 <+81>:    vpcmpgtb %xmm4,%xmm2,%xmm9
   0x00007ffff7b71385 <+85>:    vpcmpgtb %xmm5,%xmm2,%xmm10
   0x00007ffff7b71389 <+89>:    vpandn %xmm7,%xmm8,%xmm8
   0x00007ffff7b7138d <+93>:    vpandn %xmm9,%xmm10,%xmm10
   0x00007ffff7b71392 <+98>:    vpand  %xmm6,%xmm8,%xmm8
   [..]

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