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optimization/6783: mmx intrinsics problem with -O2 and -O3 opt.
- From: gert dot vervoort at philips dot com
- To: gcc-gnats at gcc dot gnu dot org
- Date: 23 May 2002 11:28:50 -0000
- Subject: optimization/6783: mmx intrinsics problem with -O2 and -O3 opt.
- Reply-to: gert dot vervoort at philips dot com
>Number: 6783
>Category: optimization
>Synopsis: mmx intrinsics problem with -O2 and -O3 opt.
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Thu May 23 04:36:02 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: gert.vervoort@philips.com
>Release: gcc-3.1
>Organization:
>Environment:
vervoort@linux22 [68] > uname -a
Linux linux22 2.4.18 #2 SMP Fri Apr 19 16:21:16 CEST 2002 i686 unknown
vervoort@linux22 [69] > /cadappl/gcc/3.1/bin/gcc -v
Reading specs from /cadappl/gcc/3.1/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: /home/hooft/Level/Work/gcc/gcc-3.1/gcc-3.1/configure --prefix=/cadappl/gcc/3.1 --enable-shared --enable-languages=c,c++,f77
Thread model: single
gcc version 3.1
>Description:
gcc 3.1 generates wrong code when using mmx intrinsics
with '-O2' and '-O3'. '-O' works oke.
>How-To-Repeat:
vervoort@linux22 [80] > /cadappl/gcc/3.1/bin/gcc -O -mmmx intrinsic_mmx_add.c
vervoort@linux22 [81] > ./a.out
11 22 33 44 55 66 77 88
vervoort@linux22 [82] > /cadappl/gcc/3.1/bin/gcc -O2 -mmmx intrinsic_mmx_add.
vervoort@linux22 [83] > ./a.out
68 253 2 64 255 255 42 144
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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