Bug#164588: gcc-3.2: -march=athlon or -march=pentium2 with -O2 incorrectly mix MMX with FPU
tags 164588 + moreinfo
thanks
- please recheck with gcc-3.2_3.2.1-0pre4 (from unstable)
- please attach the preprocessed output
Felix Kühling writes:
> Package: gcc-3.2
> Version: 1:3.2.1-0pre2
> Severity: normal
>
> I tracked down this problem in the DRI CVS source tree. When compiling
> with -O2 -march=athlon or -O2 -march=pentium2 the generated code
> incorrectly mixes MMX and FPU instructions. I generated a stripped
> down preprocessed file and added a small main function and 2 printfs
> to demonstrate the problem. I will submit it as attachment with a
> follow-up mail. This is the exact compiler command line:
>
> gcc-3.2 -Wall -O2 -march=athlon -o radeon_state2 radeon_state2.i
>
> The programme is compiled correctly with:
>
> gcc-3.2 -Wall -O2 -mcpu=athlon -o radeon_state2 radeon_state2.i
>
> or
>
> gcc-3.2 -Wall -O2 -march=athlon -mno-mmx -mno-3dnow -o radeon_state2 radeon_state2.i
>
> The incorrect version produces this output
> Inside if: 133 != nan || 589 != nan
>
> and a sigsegv since I didn't fake things up enough in the main function ;-)
>
> The correct version produces this output:
> Outside if: 133 != 133.000000 || 589 != 589.000000
>
> -- System Information
> Debian Release: testing/unstable
> Architecture: i386
> Kernel: Linux viking 2.4.19 #6 Fre Sep 27 23:46:47 CEST 2002 i686
> Locale: LANG=de_DE.ISO-8859-1, LC_CTYPE=de_DE.ISO-8859-1
>
> Versions of packages gcc-3.2 depends on:
> ii binutils 2.13.90.0.4-1 The GNU assembler, linker and bina
> ii cpp-3.2 1:3.2.1-0pre2 The GNU C preprocessor.
> ii gcc-3.2-base 1:3.2.1-0pre2 The GNU Compiler Collection (base
> ii libc6 2.2.5-14.3 GNU C Library: Shared libraries an
> ii libgcc1 1:3.2.1-0pre2 GCC support library.
>
>
>
> --
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