[llvm] [GlobalISel] Combine G_ZEXT of undef -> 0 (PR #113764)
Amara Emerson via llvm-commits
llvm-commits at lists.llvm.org
Sat Oct 26 11:25:50 PDT 2024
Thorsten =?utf-8?q?Schütt?= <schuett at gmail.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/113764 at github.com>
================
@@ -2916,8 +2916,11 @@ void CombinerHelper::replaceInstWithFConstant(MachineInstr &MI, double C) {
void CombinerHelper::replaceInstWithConstant(MachineInstr &MI, int64_t C) {
assert(MI.getNumDefs() == 1 && "Expected only one def?");
- Builder.buildConstant(MI.getOperand(0), C);
- MI.eraseFromParent();
+ LLT DstTy = MRI.getType(MI.getOperand(0).getReg());
+ if (isConstantLegalOrBeforeLegalizer(DstTy)) {
----------------
aemerson wrote:
```
if (MRI.hasOneNonDbgUse(DefReg)) {
Helper.replaceInstWithConstant(MI, NewConst);
MI.eraseFromParent();
}
```
You see the problem?
https://github.com/llvm/llvm-project/pull/113764
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