================
@@ -99,6 +99,42 @@ static void initializeAlloca(CodeGenFunction &CGF,
AllocaInst *AI, Value *Size,
I->addAnnotationMetadata("auto-init");
}
+static Value *handleHlslClip(const CallExpr *E, CodeGenFunction *CGF) {
+ Value *Op0 = CGF->EmitScalarExpr(E->getArg(0));
+
+ Constant *FZeroConst = ConstantFP::getZero(CGF->FloatTy);
+ Value *CMP;
+
+ if (const auto *VecTy = E->getArg(0)->getType()->getAs<clang::VectorType>())
{
+ FZeroConst = ConstantVector::getSplat(
+ ElementCount::getFixed(VecTy->getNumElements()), FZeroConst);
+ auto *FCompInst = CGF->Builder.CreateFCmpOLT(Op0, FZeroConst);
+ CMP = CGF->Builder.CreateIntrinsic(
+ CGF->Builder.getInt1Ty(), CGF->CGM.getHLSLRuntime().getAnyIntrinsic(),
+ {FCompInst}, nullptr);
+ } else
+ CMP = CGF->Builder.CreateFCmpOLT(Op0, FZeroConst);
+
+ if (CGF->CGM.getTarget().getTriple().isDXIL())
+ return CGF->Builder.CreateIntrinsic(CGF->VoidTy, llvm::Intrinsic::dx_clip,
----------------
joaosaffran wrote:
Here is an example of the current generated IR:
```
define void @test_vector(<4 x float> noundef %Buf) {
entry:
%Buf.addr = alloca <4 x float>, align 16
store <4 x float> %Buf, ptr %Buf.addr, align 16
%1 = load <4 x float>, ptr %Buf.addr, align 16
%2 = fcmp olt <4 x float> %1, zeroinitializer
%3 = call i1 @llvm.spv.any.v4i1(<4 x i1> %2)
br i1 %3, label %lt0, label %end
lt0: ; preds = %entry
call void @llvm.spv.clip()
br label %end
end: ; preds = %lt0, %entry
ret void
}
```
The challenge, I see, with invoke `selectAny` when handling `selectClip` is
that we need to call `any` before calling the conditional branch. In order to
call `selectAny` in `llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp` that
would also require creating the branch call when selecting the spirv
instruction. That doesn't seem to be the proper place to generate the branching
code. Please, let me know if I am missing something here.
https://github.com/llvm/llvm-project/pull/114588
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