[PATCH] D97731: [AArch64][GlobalISel] Lower G_BUILD_VECTOR -> G_DUP for non-constant splats
Jessica Paquette via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Mar 1 13:51:08 PST 2021
paquette created this revision.
paquette added a reviewer: aemerson.
Herald added subscribers: danielkiss, hiraditya, kristof.beyls, rovka.
paquette requested review of this revision.
Herald added a project: LLVM.
If we have
%vec = G_BUILD_VECTOR %reg, %reg, ..., %reg
Then lower it to
%vec = G_DUP %reg
Only do this when `%reg` is not a constant. In the case of a constant, we should prefer MOV.
Minor code size improvements on CTMark at -Os.
https://reviews.llvm.org/D97731
Files:
llvm/lib/Target/AArch64/AArch64Combine.td
llvm/lib/Target/AArch64/GISel/AArch64PostLegalizerLowering.cpp
llvm/test/CodeGen/AArch64/GlobalISel/postlegalizer-lowering-build-vector-to-dup.mir
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