[PATCH] D125670: [LSR] Early exit for RateFormula when it is already losing
Yueh-Ting (eop) Chen via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon May 16 01:29:47 PDT 2022
eopXD created this revision.
eopXD added reviewers: reames, SjoerdMeijer, evstupac.
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The codebase implicitly implies that Cost::RateFormula is only called
when the Cost is not in losing status, or else there may be possible
to trigger the assertion of Cost::isValid.
A safe way is to direct return when the cost is already losing.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D125670
Files:
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
Index: llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1355,6 +1355,8 @@
const DenseSet<const SCEV *> &VisitedRegs,
const LSRUse &LU,
SmallPtrSetImpl<const SCEV *> *LoserRegs) {
+ if (isLoser())
+ return;
assert(F.isCanonical(*L) && "Cost is accurate only for canonical formula");
// Tally up the registers.
unsigned PrevAddRecCost = C.AddRecCost;
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