================
@@ -1977,6 +1989,37 @@ Value
*AMDGPUCodeGenPrepareImpl::applyFractPat(IRBuilder<> &Builder,
return insertValues(Builder, FractArg->getType(), ResultVals);
}
+bool AMDGPUCodeGenPrepareImpl::visitCtpop(IntrinsicInst &I) {
+ uint32_t BitWidth, DestinationWidth, IntrinsicWidth;
+ if (!I.hasOneUse() || !I.getType()->isIntegerTy() ||
+ !ST.hasBCNT(BitWidth = I.getType()->getIntegerBitWidth()))
+ return false;
+
+ BinaryOperator *MustBeSub = dyn_cast<BinaryOperator>(I.user_back());
+ if (!MustBeSub || MustBeSub->getOpcode() != BinaryOperator::Sub)
+ return false;
+
+ ConstantInt *FirstOperand = dyn_cast<ConstantInt>(MustBeSub->getOperand(0));
+ if (!FirstOperand || FirstOperand->getZExtValue() != BitWidth)
+ return false;
+
+ IRBuilder<> Builder(MustBeSub);
+ Instruction *TransformedIns =
+ Builder.CreateIntrinsic(BitWidth > 32 ? Intrinsic::amdgcn_bcnt64_lo
+ : Intrinsic::amdgcn_bcnt32_lo,
+ {}, {I.getArgOperand(0)});
+
+ if ((DestinationWidth = MustBeSub->getType()->getIntegerBitWidth()) !=
+ (IntrinsicWidth = TransformedIns->getType()->getIntegerBitWidth()))
+ TransformedIns = cast<Instruction>(Builder.CreateZExtOrTrunc(
+ TransformedIns, Type::getIntNTy(I.getContext(), DestinationWidth)));
+
+ MustBeSub->replaceAllUsesWith(TransformedIns);
+ TransformedIns->takeName(MustBeSub);
+ MustBeSub->eraseFromParent();
----------------
jmmartinez wrote:
```suggestion
ReplaceInstWithValue(MustBeSub, TransformedIns);
```
https://github.com/llvm/llvm-project/pull/164847
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