08/01/14 04:22:38
>>69
まさか、sseのないCPUって落ち? つーか、-msse(or sse2など) つけてないのかな?
一応こんな感じなんだけど。
--
$ gcc --version
gcc (GCC) 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
Copyright (C) 2004 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
--
$ gcc foo.c -msse2 -mfpmath=sse
--
# _DF == float
$ ./a|tail -1
23 0.0000001192092895507812
--
# _DF == double
$ ./a|tail -1
52 0.0000000000000002220446
--
$ gcc foo.c
--
$ ./a|tail -1
63 0.0000000000000000001084