------- Comment #19 from amacleod at redhat dot com 2007-04-05 17:24 ------- what are you using for a compiler? Im using a mainline from mid march, and with it, my .optimized files diff exactly the same, and I get the aforementioned time differences in the executables. (sse.c and sse-bad.c are same, just different names to get different output files)
2007-03-13/gcc> diff sse.c sse-bad.c 2007-03-13/gcc>./xgcc -B./ sse.c -fdump-tree-optimized -O3 -march=pentium4 -o sse 2007-03-13/gcc>./xgcc -B./ sse-bad.c -fdump-tree-optimized -O3 -march=pentium4 -mfpmath=sse -o sse-bad 2007-03-13/gcc>ls -l sse*optimized -rw-rw-r-- 1 amacleod amacleod 864 Apr 5 12:16 sse-bad.c.116t.optimized -rw-rw-r-- 1 amacleod amacleod 864 Apr 5 12:16 sse.c.116t.optimized 2007-03-13/gcc>diff sse.c.116t.optimized sse-bad.c.116t.optimized 2007-03-13/gcc>time ./sse Start? Stop! Result = 0.000000, 0.000000, 1.000000 real 0m0.630s user 0m0.572s sys 0m0.000s 2007-03-13/gcc>time ./sse-bad Start? Stop! Result = 0.000000, 0.000000, 1.000000 real 0m0.883s user 0m0.780s sys 0m0.000s Is this just with earlier compilers, what version are you using? It at least seems to indicate that the problem isn't before out-of-ssa since the time issue is still there with identical outputs from .optimized -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19780
