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| author | Craig Topper <craig.topper@intel.com> | 2019-06-04 17:44:18 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2019-06-04 17:44:18 +0000 |
| commit | 09a4415803cd590ebb68a5141950366b077f13a7 (patch) | |
| tree | 390cc4a57b56939c33765030b79e1c537f8878a4 /llvm/lib/Transforms/Utils/BasicBlockUtils.cpp | |
| parent | 0cdaf3a09fea6db0008828264bf84c91a5b6eba1 (diff) | |
| download | bcm5719-llvm-09a4415803cd590ebb68a5141950366b077f13a7.tar.gz bcm5719-llvm-09a4415803cd590ebb68a5141950366b077f13a7.zip | |
[DAGCombiner][X86] Fold (not (neg X)) -> (add X, -1)
This is a special case of a more general transform (not (sub Y, X)) -> (add X, ~Y). InstCombine knows the general form. I've restricted to the special case to fix the motivating case PR42118. I tried handling any case where Y was constant, but got some changes on some Mips tests that I couldn't quickly prove where beneficial.
Fixes PR42118
Differential Revision: https://reviews.llvm.org/D62828
llvm-svn: 362533
Diffstat (limited to 'llvm/lib/Transforms/Utils/BasicBlockUtils.cpp')
0 files changed, 0 insertions, 0 deletions
