[PATCH] D151658: [LV] Check if value was already not uniform for previous VF.
Florian Hahn via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sun Jun 4 12:31:37 PDT 2023
This revision was automatically updated to reflect the committed changes.
Closed by commit rGe19297471a09: [LV] Check if value was already not uniform for previous VF. (authored by fhahn).
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D151658/new/
https://reviews.llvm.org/D151658
Files:
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
Index: llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -4672,9 +4672,17 @@
if (Cmp && TheLoop->contains(Cmp) && Cmp->hasOneUse())
addToWorklistIfAllowed(Cmp);
+ auto PrevVF = VF.divideCoefficientBy(2);
// Return true if all lanes perform the same memory operation, and we can
// thus chose to execute only one.
auto isUniformMemOpUse = [&](Instruction *I) {
+ // If the value was already known to not be uniform for the previous
+ // (smaller VF), it cannot be uniform for the larger VF.
+ if (PrevVF.isVector()) {
+ auto Iter = Uniforms.find(PrevVF);
+ if (Iter != Uniforms.end() && !Iter->second.contains(I))
+ return false;
+ }
if (!Legal->isUniformMemOp(*I, VF))
return false;
if (isa<LoadInst>(I))
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