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Differential D28846

DAG: Fold fneg into compare with constant into the constant
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Authored by arsenm on Jan 17 2017, 11:02 PM.

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• tstellarAMD
escha
Summary

fcmp (fneg x), c, pred -> fcmp x, -c, (swap pred)




InstCombine already does this.
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arsenm created this revision.Jan 17 2017, 11:02 PM
arsenm updated this revision to Diff 84930.Jan 18 2017, 9:49 PM
Add tests showing net improvement with multiple uses
escha accepted this revision.Jan 30 2017, 9:21 AM
This revision is now accepted and ready to land.Jan 30 2017, 9:21 AM
arsenm closed this revision.Jan 30 2017, 10:08 AM
r293512
Revision Contents
Changeset List
Diff 84930
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lib/CodeGen/SelectionDAG/TargetLowering.cpp
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test/CodeGen/AMDGPU/setcc-fneg-constant.ll
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test/CodeGen/SystemZ/fp-cmp-05.ll
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test/CodeGen/XCore/fneg.ll
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