================
@@ -157,6 +158,35 @@ static bool expandAnyIntrinsic(CallInst *Orig) {
return true;
}
+static bool expandLengthIntrinsic(CallInst *Orig) {
+ Value *X = Orig->getOperand(0);
+ IRBuilder<> Builder(Orig->getParent());
+ Builder.SetInsertPoint(Orig);
+ Type *Ty = X->getType();
+ Type *EltTy = Ty->getScalarType();
+
+ // Though dx.length does work on scalar type, we can optimize it to just emit
+ // fabs, in CGBuiltin.cpp. We shouldn't see a scalar type here because
+ // CGBuiltin.cpp should have emitted a fabs call.
+ Value *Elt = Builder.CreateExtractElement(X, (uint64_t)0);
+ auto *XVec = dyn_cast<FixedVectorType>(Ty);
+ unsigned size = XVec->getNumElements();
+ assert(Ty->isVectorTy() && size > 1 && "dx.length only works on vector
type");
+
+ Value *Sum = Builder.CreateFMul(Elt, Elt);
+ for (unsigned i = 1; i < size; i++) {
+ Elt = Builder.CreateExtractElement(X, i);
----------------
bogner wrote:
Style nit, "i" should be capitalized
```suggestion
for (unsigned I = 1; I < size; I++) {
Elt = Builder.CreateExtractElement(X, I);
```
https://github.com/llvm/llvm-project/pull/101256
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