[PATCH] D19391: transform masking off of an FP sign bit into a fabs...but only if it's legal!

[escha via llvm-commits]

escha added a comment.

Our target has a legal FABS (it is in fact, free, as it's a modifier). But it's implemented as FADD DST, SRC.ABS, -0.0, which may modify bits other than the top bit.


http://reviews.llvm.org/D19391