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c/9525: incorrect code generation on SSE2 intrinsics
- From: smh1008 at cus dot cam dot ac dot uk
- To: gcc-gnats at gcc dot gnu dot org
- Date: 31 Jan 2003 14:34:12 -0000
- Subject: c/9525: incorrect code generation on SSE2 intrinsics
- Reply-to: smh1008 at cus dot cam dot ac dot uk
>Number: 9525
>Category: c
>Synopsis: incorrect code generation on SSE2 intrinsics
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Fri Jan 31 14:36:01 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: D Huen
>Release: gcc version 3.3 20030117 (prerelease)
>Organization:
>Environment:
intel P4 on RH8.1 chandler beta
>Description:
The test file is a compilable snippet from a large program. Wrong code generation still occurs in this snippet although the error is different.
When compiled this wrong code is generated:-
main:
pushl %ebp
movl %esp, %ebp
subl $72, %esp
movdqa (%eax), %xmm0
andl $-16, %esp
movdqa %xmm0, -40(%ebp)
movaps %xmm0, %xmm2
movdqa -24(%ebp), %xmm0
pcmpeqd %xmm0, %xmm2
movdqa %xmm0, %xmm1
movdqa %xmm2, %xmm0
pand %xmm2, %xmm1
pandn -40(%ebp), %xmm0
por %xmm0, %xmm1
The _mm_add_epi32 is eliminated and the pandn then picks up the wrong value. In the original program from which this snippet came , the arguments of pandn are correct but swapped.
>How-To-Repeat:
gcc -O2 -S -march=pentium4 -mmmx -msse -msse2 test.c
>Fix:
I have worked around with inline assembler.
>Release-Note:
>Audit-Trail:
>Unformatted:
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