[llvm] Optimize count leading ones if promoted type (PR #99591)
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llvm-commits at lists.llvm.org
Wed Jul 24 02:16:40 PDT 2024
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@@ -2298,8 +2298,29 @@ static bool despeculateCountZeros(IntrinsicInst *CountZeros,
if (match(CountZeros->getOperand(1), m_One()))
return false;
- // If it's cheap to speculate, there's nothing to do.
Type *Ty = CountZeros->getType();
+ EVT VTy = TLI->getValueType(*DL, Ty);
+
+ // do not despeculate if we have (ctlz (xor op -1)) if the operand is
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v01dXYZ wrote:
I made a mistake though since I should have used `InstructionOpcodeToISD`.
https://github.com/llvm/llvm-project/pull/99591
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