[llvm] [LoopIdiom] Support 'shift until less-than' idiom (PR #95002)
Hari Limaye via llvm-commits
llvm-commits at lists.llvm.org
Mon Jul 1 06:02:00 PDT 2024
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@@ -1517,6 +1524,34 @@ static Value *matchCondition(BranchInst *BI, BasicBlock *LoopEntry,
return nullptr;
}
+/// Check if the given conditional branch is based on an unsigned less-than
+/// comparison between a variable and a constant, and if the comparison is false
+/// the control yields to the loop entry. If the branch matches the behaviour,
+/// the variable involved in the comparison is returned.
+static Value *matchShiftULTCondition(BranchInst *BI, BasicBlock *LoopEntry,
+ unsigned &Threshold) {
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hazzlim wrote:
Ah good point, I've changed this.
https://github.com/llvm/llvm-project/pull/95002
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