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.
