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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2020-02-12 16:07:16 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2020-02-12 16:07:27 +0000 |
| commit | ff307c8120ecca89193576c38d68a0353ea49e8b (patch) | |
| tree | f594997ac15d609f7f550de1e12efbf108244774 /lldb/test/API/functionalities/plugins/python_os_plugin | |
| parent | 665dcdacc06b056c3279a1fccbcae4660d80f117 (diff) | |
[X86] combineFneg - generalize FMA negations with isNegatibleForFree/getNegatedExpression
This has a really interesting side effect in that it improves some UMAX/UMIN reduction code which had redundant XOR(SHUFFLE(XOR(X,SIGNMASK)),SIGNMASK) patterns - the getNegatibleCost recognises it as FNEG(SHUFFLE(FNEG(X))).... We have a lot of FNEG patterns bitcasted to the integer domain for XOR signbit twiddling which is similar to what we do to allow UMAX/UMIN to be lowered using SMAX/SMIN.
Differential Revision: https://reviews.llvm.org/D74231
Diffstat (limited to 'lldb/test/API/functionalities/plugins/python_os_plugin')
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