optimization/6783: mmx intrinsics problem with -O2 and -O3 opt.

[gert.vervoort@philips.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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