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16 Commits

Author SHA1 Message Date
Matthias Braun dbcf9e2ee4 LiveRegMatrix: Fix some subreg interference checks 
Surprisingly, one of the three interference checks in LiveRegMatrix was
using the main live range instead of the apropriate subregister range
resulting in unnecessarily conservative results.

llvm-svn: 296722
 2017-03-02 00:35:08 +00:00
Matt Arsenault e1b595306d AMDGPU: Fold fneg into fmin/fmax_legacy 
llvm-svn: 293972
 2017-02-03 00:51:50 +00:00
Matt Arsenault 2511c031de AMDGPU: Fold fneg into fminnum/fmaxnum 
llvm-svn: 293968
 2017-02-03 00:23:15 +00:00
Matt Arsenault a8fcfadf46 AMDGPU: Check if users of fneg can fold mods 
In multi-use cases this can save a few instructions.

llvm-svn: 293962
 2017-02-02 23:21:23 +00:00
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