[PATCH] D66308: [InstCombine] Fold select with ctlz to cttz
Dávid Bolvanský via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Thu Aug 15 11:27:42 PDT 2019
xbolva00 created this revision.
xbolva00 added reviewers: spatel, nikic, lebedev.ri.
Herald added subscribers: llvm-commits, kristof.beyls, javed.absar.
Herald added a project: LLVM.
Handle pattern [0]:
int ctz(unsigned int a)
{
int c = __clz(a & -a);
return a ? 31 - c : c;
}
[0] https://community.arm.com/community-help/f/discussions/2114/count-trailing-zeros
Repository:
rL LLVM
https://reviews.llvm.org/D66308
Files:
lib/Transforms/InstCombine/InstCombineSelect.cpp
test/Transforms/InstCombine/select-ctlz-to-cttz.ll
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