================
@@ -148,6 +148,15 @@ template <typename T> constexpr T ldexp_impl(T X, T Exp) {
return exp2(Exp) * X;
}
+template <typename T, int Bitwidth> constexpr uint firstbithigh_impl(T X) {
+ return (Bitwidth - 1) - __builtin_hlsl_elementwise_firstbithigh(X);
+}
+
+template <typename T, int N, int Bitwidth>
+constexpr vector<uint, N> firstbithigh_impl(vector<T, N> X) {
+ return (Bitwidth - 1) - __builtin_hlsl_elementwise_firstbithigh(X);
----------------
farzonl wrote:
This does look like it would change the behavior of what DXC currently does
when targeting SPIRV.
https://godbolt.org/z/vq5EGKTq5
I think thats fine, because its a clear case of divergent behavior. Not sure
how we would document this for any vulkan shaders that break.
https://github.com/llvm/llvm-project/pull/166419
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