Actually it enables more than the builtins. It enables the use sse3
instructions. This is just like -maltivec on PowerPC and -msse and
-msse
on x86, etc.
Right, so the manual disagrees and should probably be fixed.
And then RTH agreed:
http://gcc.gnu.org/ml/gcc-patches/2005-03/msg01432.html
So from the sound of it fisttp is not a SSE3 instruction.
Richard's response was that it shouldn't be turned off by -mno-sse3,
not that it shouldn't be turned on for -msse3. I think it probably
should be turned on there.
-eric
