[X86] isVectorShiftByScalarCheap - don't limit fast XOP vector shifts to 128-bit...
authorSimon Pilgrim <llvm-dev@redking.me.uk>
Sat, 9 May 2020 21:09:01 +0000 (22:09 +0100)
committerSimon Pilgrim <llvm-dev@redking.me.uk>
Sat, 9 May 2020 21:24:08 +0000 (22:24 +0100)
commit9237d88001cad7effd1e5dbe2a20a4412ab6262c
tree4b609bc57d7f6c8c304be05346dbaf3c79cb35f1
parent5b02be0b973a0d792bf8ce39170487f48b6cbd08
[X86] isVectorShiftByScalarCheap - don't limit fast XOP vector shifts to 128-bit vectors

XOP targets have fast per-element vector shifts and we're better off splitting to 128-bit shifts where necessary (which is what we already do in LowerShift).
llvm/lib/Target/X86/X86ISelLowering.cpp
llvm/test/CodeGen/X86/vector-shift-by-select-loop.ll
llvm/test/Transforms/CodeGenPrepare/X86/vec-shift.ll