================
@@ -503,6 +503,48 @@ Instruction *InstCombinerImpl::foldSelectOpOp(SelectInst
&SI, Instruction *TI,
return nullptr;
}
+/// select C, f(..., X, ...), f(..., Y, ...) --> f(..., select C, X, Y, ...)
+static Instruction *
+foldSelectIntoIntrinsicArg(SelectInst &SI, IntrinsicInst *TII,
+ IntrinsicInst *FII,
+ InstCombiner::BuilderTy &Builder) {
+ if (TII->getCalledFunction() != FII->getCalledFunction())
+ return nullptr;
+
+ std::optional<unsigned> DiffArgNo;
+ for (unsigned I = 0, E = TII->arg_size(); I != E; ++I) {
+ if (TII->getArgOperand(I) == FII->getArgOperand(I))
+ continue;
+ if (DiffArgNo)
+ return nullptr;
+ DiffArgNo = I;
+ }
+ if (!DiffArgNo)
+ return nullptr;
+
+ // A select cannot feed a parameter that requires an immediate.
+ if (TII->paramHasAttr(*DiffArgNo, Attribute::ImmArg))
----------------
harrisonGPU wrote:
Updated.
https://github.com/llvm/llvm-project/pull/227737
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