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The branch prediction hints is actually hurts performance in this case. The assembly implementation make two assumptions: 1. 'fabs (x) < 2^52' is unlikely and 2. 'x > 0.0' is unlike (if 1. is true). Since it a general floating point function, expected input is not bounded and then it is better to let the hardware handle the branches. |
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generic | ||
gnu | ||
i386 | ||
ieee754 | ||
init_array | ||
mach | ||
posix | ||
powerpc | ||
pthread | ||
s390 | ||
sh | ||
sparc | ||
unix | ||
wordsize-32 | ||
wordsize-64 | ||
x86 | ||
x86_64 |