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12 Commits

Author SHA1 Message Date
Matt Arsenault 53f0cc238c AMDGPU: Fold fneg into round instructions 
llvm-svn: 293127
 2017-01-26 01:25:36 +00:00
Matt Arsenault 74a576e7d3 AMDGPU: Check nsz instead of unsafe math 
llvm-svn: 293028
 2017-01-25 06:27:02 +00:00
Matt Arsenault 8a27aee6ae DAGCombiner: Allow negating ConstantFP after legalize 
llvm-svn: 293019
 2017-01-25 04:54:34 +00:00
Matt Arsenault 3e6f9b5773 AMDGPU: Disable some fneg combines unless nsz 
For -(x + y) -> (-x) + (-y), if x == -y, this would
change the result from -0.0 to 0.0. Since the fma/fmad
combine is an extension of this problem it also
applies there.

fmul should be fine, and I don't think any of the unary
operators or conversions should be a problem either.

llvm-svn: 292473
 2017-01-19 06:35:27 +00:00
Matt Arsenault 31c039ef2e AMDGPU: Fold free fneg into sin 
llvm-svn: 291790
 2017-01-12 18:48:09 +00:00
Matt Arsenault a8c325e2f5 AMDGPU: Fold fneg into fmul_legacy 
llvm-svn: 291784
 2017-01-12 18:26:30 +00:00
Matt Arsenault ff7e5aadf5 AMDGPU: Fold fneg into rcp 
llvm-svn: 291779
 2017-01-12 17:46:35 +00:00
Matt Arsenault 4242d48c36 AMDGPU: Fold fneg into fp_round 
llvm-svn: 291778
 2017-01-12 17:46:33 +00:00
Matt Arsenault 98d2bf1024 AMDGPU: Fold fneg into fp_extend 
llvm-svn: 291777
 2017-01-12 17:46:28 +00:00
Matt Arsenault 63f953795e AMDGPU: Fold fneg into fma or fmad 
Patch mostly by Fiona Glaser

llvm-svn: 291733
 2017-01-12 00:32:16 +00:00
Matt Arsenault 4103a81d6d AMDGPU: Fold fneg into fmul 
Patch mostly by Fiona Glaser

llvm-svn: 291732
 2017-01-12 00:23:20 +00:00
Matt Arsenault 2529fba989 AMDGPU: Fold fneg into fadd 
Patch mostly by Fiona Glaser

llvm-svn: 291731
 2017-01-12 00:09:34 +00:00