[PATCH] D48768: [X86] When have BMI2, prefer shifts to clear low/high bits, rather than variable mask.
Roman Lebedev via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Jul 3 11:48:32 PDT 2018
lebedev.ri updated this revision to Diff 153948.
lebedev.ri added a comment.
- Rebased ontop of more tests
- Always transform for x86, unless vector, or 64-bit width non-64-bit target.
Repository:
rL LLVM
https://reviews.llvm.org/D48768
Files:
include/llvm/CodeGen/TargetLowering.h
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
lib/Target/X86/X86ISelLowering.cpp
lib/Target/X86/X86ISelLowering.h
test/CodeGen/X86/clear-highbits.ll
test/CodeGen/X86/clear-lowbits.ll
test/CodeGen/X86/extract-lowbits.ll
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