------- Comment #6 from uros at kss-loka dot si 2006-10-25 12:04 ------- (In reply to comment #5) > With more registers (x86_64) the stack moves are gone, but: (!)
> (testing done on AMD Athlon fam 15 model 35 stepping 2) On Xeon 3.6, SSE is now faster: gcc -O2 -march=pentium4 -mfpmath=387 pr19780.c time ./a.out Start? Stop! Result = 0.000000, 0.000000, 1.000000 real 0m0.805s user 0m0.804s sys 0m0.000s gcc -O2 -march=pentium4 -mfpmath=sse pr19780.c time ./a.out Start? Stop! Result = 0.000000, 0.000000, 1.000000 real 0m0.707s user 0m0.704s sys 0m0.004s vendor_id : GenuineIntel cpu family : 15 model : 4 model name : Intel(R) Xeon(TM) CPU 3.60GHz stepping : 10 cpu MHz : 3600.970 cache size : 2048 KB The question is now, why is Athlon so slow with SFmode SSE? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19780
