https://bugs.kde.org/show_bug.cgi?id=359952
Bug ID: 359952
Summary: Unrecognised PCMPESTRM variants
Product: valgrind
Version: 3.11.0
Platform: Compiled Sources
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: general
Assignee: jsew...@acm.org
Reporter: christoficos...@gambitresearch.com
I have an application that uses SSE4.2 string instructions to speed up some
text parsing. Unfortunately, it causes valgrind to raise SIGILL:
vex amd64->IR: unhandled instruction bytes: 0xC4 0xE3 0x79 0x60 0xD1 0x70 0xC5
0xF9
vex amd64->IR: REX=0 REX.W=0 REX.R=0 REX.X=0 REX.B=0
vex amd64->IR: VEX=1 VEX.L=0 VEX.nVVVV=0x0 ESC=0F3A
vex amd64->IR: PFX.66=1 PFX.F2=0 PFX.F3=0
40255f: c4 e3 79 60 d1 70 vpcmpestrm $0x70,%xmm1,%xmm2
The same happens if I compile with -mno-avx:
vex amd64->IR: unhandled instruction bytes: 0x66 0xF 0x3A 0x60 0xD1 0x70 0x66
0xF
vex amd64->IR: REX=0 REX.W=0 REX.R=0 REX.X=0 REX.B=0
vex amd64->IR: VEX=0 VEX.L=0 VEX.nVVVV=0x0 ESC=0F3A
vex amd64->IR: PFX.66=1 PFX.F2=0 PFX.F3=0
4024df: 66 0f 3a 60 d1 70 pcmpestrm $0x70,%xmm1,%xmm2
For completeness, the culprit is the following bit of code (g++ 4.8.4):
#include <nmmintrin.h>
...
__m128i mask = _mm_cmpestrm(separators, 2, data, 16,
_SIDD_UBYTE_OPS | _SIDD_CMP_EQUAL_ANY |
_SIDD_MASKED_NEGATIVE_POLARITY | _SIDD_UNIT_MASK);
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