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target/10077: gcc -msse2 generates movd to move dwords between xmm regs
- From: douze at enseeiht dot fr
- To: gcc-gnats at gcc dot gnu dot org
- Date: 14 Mar 2003 08:14:57 -0000
- Subject: target/10077: gcc -msse2 generates movd to move dwords between xmm regs
- Reply-to: douze at enseeiht dot fr
>Number: 10077
>Category: target
>Synopsis: gcc -msse2 generates movd to move dwords between xmm regs
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri Mar 14 08:16:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: douze at enseeiht dot fr
>Release: gcc 3.2.2 on x86
>Organization:
>Environment:
Linux 2.4.18
>Description:
The bug appears when I compile a function with many variables. GCC then uses xmm registers as 32-bit scalar integer registers.
When it has to move data with an xmm register involved, it generates a movd instruction, which doesn't work (movss might work better). Although there is sse2 assembly in my code, I don't think it comes from there.
The assembler used is GNU assembler version 2.11.92.0.10 (i486-suse-linux) using BFD version 2.11.92.0.10 20011021 (SuSE)
>How-To-Repeat:
Compile the code with
gcc -c gcc_bug.i -msse2 -O3
>Fix:
replace movd with movss in the .s file
>Release-Note:
>Audit-Trail:
>Unformatted:
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