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3 Commits

Author SHA1 Message Date
Davide Italiano
a4b22c0406 [SimplifyLibCalls] Remove useless bits of this tests. 
llvm-svn: 254318
 2015-11-30 19:38:35 +00:00
Davide Italiano
0f427b7147 [SimplifyLibCalls] Transform log(exp2(y)) to y*log(2) under fast-math. 
llvm-svn: 254317
 2015-11-30 19:36:35 +00:00
Davide Italiano
85963c8ad6 [SimplifyLibCalls] Tranform log(pow(x, y)) -> y*log(x). 
This one is enabled only under -ffast-math. There are cases where the
difference between the value computed and the correct value is huge
even for ffast-math, e.g. as Steven pointed out:

x = -1, y = -4
log(pow(-1), 4) = 0
4*log(-1) = NaN

I checked what GCC does and apparently they do the same optimization
(which result in the dramatic difference). Future work might try to
make this (slightly) less worse.

Differential Revision:	http://reviews.llvm.org/D14400

llvm-svn: 254263
 2015-11-29 20:58:04 +00:00