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Author SHA1 Message Date
Sanjay Patel a194b2d2ff [InstCombine] fold fneg into constant operand of fmul/fdiv 
This accounts for the missing IR fold noted in D50195. We don't need any fast-math to enable the negation transform. 
FP negation can always be folded into an fmul/fdiv constant to eliminate the fneg.

I've limited this to one-use to ensure that we are eliminating an instruction rather than replacing fneg by a 
potentially expensive fdiv or fmul.

Differential Revision: https://reviews.llvm.org/D50417

llvm-svn: 339248
 2018-08-08 14:29:08 +00:00
Sanjay Patel 979423c996 [InstCombine] add tests for fneg fold including FMF; NFC 
llvm-svn: 339203
 2018-08-07 23:24:25 +00:00
Sanjay Patel bac052ef52 [InstCombine] fix FP constant in test; NFC 
Too many digits...

llvm-svn: 339200
 2018-08-07 23:03:29 +00:00
Sanjay Patel 25887da162 [InstCombine] add tests for fneg of fmul/fdiv with constant; NFC 
llvm-svn: 339195
 2018-08-07 22:30:43 +00:00