[clang] [llvm] Add step builtins and step HLSL function to DirectX and SPIR-V backend (PR #106471)

[Justin Bogner via cfe-commits]

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@@ -320,6 +321,28 @@ static Value *expandPowIntrinsic(CallInst *Orig) {
   return Exp2Call;
 }
 
+static Value *expandStepIntrinsic(CallInst *Orig) {
+
+  Value *X = Orig->getOperand(0);
+  Value *Y = Orig->getOperand(1);
+  Type *Ty = X->getType();
+  IRBuilder<> Builder(Orig);
+
+  Constant *one = ConstantFP::get(Ty->getScalarType(), 1.0);
+  Constant *zero = ConstantFP::get(Ty->getScalarType(), 0.0);
+  Value *cond = Builder.CreateFCmpOLT(Y, X);
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bogner wrote:

Style nit: Variables should start with capital letters (One, Zero, Cond)

https://github.com/llvm/llvm-project/pull/106471