On Wed, Feb 14, 2007 at 02:34:24PM +0100, Paweł Sikora wrote: > François-Xavier Coudert napisał(a): > > >$ gcc -march=pentium4 -O3 a.c && time ./a.out > >064069fbc13963b920219c3e939225e38e38e38e3956d81c71c71c71c0ba0f00 > >./a.out 1.81s user 0.00s system 99% cpu 1.818 total > >$ gcc-4.3 -march=pentium4 -O3 a.c && time ./a.out > >064069fbc13963b920219c3e939225e38e38e38e3956d81c71c71c71c0ba0f00 > >./a.out 2.40s user 0.01s system 87% cpu 2.746 total > > > >where gcc is gcc version 4.1.1 20070105 (Red Hat 4.1.1-51) and gcc-4.3 > >is gcc version 4.3.0 20070209 (experimental). I don't have a 4.1 or > >4.2 compiler at hand, so I don't know if it's a 4.2 or 4.3 regression, > >or even if there's a special patch in redhat 4.1 that makes it > >lightning fast. But in any case, I wondered if it was known, and if it > >was worth opening a PR. > > I see this on 4.2 vs 4.3 on my k8 box. > > $ gcc42 -O3 a.c --save-temps && time ./a.out > 064069fbc13963b920219c3e939225e38e38e38e3956d81c71c71c71c0ba0f00 > ./a.out 0.43s user 0.00s system 92% cpu 0.462 total > > $ gcc43 -O3 a.c --save-temps && time ./a.out > 064069fbc13963b920219c3e939225e38e38e38e3956d81c71c71c71c0ba0f00 > ./a.out 0.60s user 0.00s system 98% cpu 0.610 total
Is this the saem as http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30735 Can you try gcc 4.3 revision 119759? H.J.
