[ValueTracking] Use BinaryOperator instead of Operator in matchSimpleRecurrence. #74678
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…urrence. Operator allows the phi operand to be a ConstantExpr. A ConstantExpr is a valid operand to a phi, but a ConstantExpr is never going to be a recurrence. So I think we should use Instruction.
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@llvm/pr-subscribers-llvm-analysis Author: Craig Topper (topperc) ChangesOperator allows the phi operand to be a ConstantExpr. A ConstantExpr is a valid operand to a phi, but a ConstantExpr is never going to be a recurrence. So I think we should use Instruction. Full diff: https://github.com/llvm/llvm-project/pull/74678.diff 1 Files Affected:
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index ee4f97f3bf5e0f..78b791d1d3b331 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -8024,7 +8024,7 @@ bool llvm::matchSimpleRecurrence(const PHINode *P, BinaryOperator *&BO,
for (unsigned i = 0; i != 2; ++i) {
Value *L = P->getIncomingValue(i);
Value *R = P->getIncomingValue(!i);
- Operator *LU = dyn_cast<Operator>(L);
+ auto *LU = dyn_cast<Instruction>(L);
if (!LU)
continue;
unsigned Opcode = LU->getOpcode();
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nikic
reviewed
Dec 7, 2023
topperc
changed the title
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Operator allows the phi operand to be a ConstantExpr. A ConstantExpr is a valid operand to a phi, but a ConstantExpr is never going to be a recurrence. We can only match a BinaryOperator so use that instead.