[llvm] [LV] Fix MVE regression from #132190 (PR #141736)
Florian Hahn via llvm-commits
llvm-commits at lists.llvm.org
Wed May 28 08:02:36 PDT 2025
================
@@ -4384,7 +4393,10 @@ VectorizationFactor LoopVectorizationPlanner::selectVectorizationFactor() {
/// Don't consider the VF if it exceeds the number of registers for the
/// target.
- if (RU.exceedsMaxNumRegs(TTI))
+ if (CM.useMaxBandwidth(VF.isScalable()
+ ? TargetTransformInfo::RGK_ScalableVector
+ : TargetTransformInfo::RGK_FixedWidthVector) &&
+ RU.exceedsMaxNumRegs(TTI))
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fhahn wrote:
I think this is the only use of RU, would be good to skip the register pressure computation when it's not needed
Same below
https://github.com/llvm/llvm-project/pull/141736
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