================
@@ -148,6 +148,31 @@ template <typename T> constexpr T ldexp_impl(T X, T Exp) {
return exp2(Exp) * X;
}
+template <typename T> constexpr T fwidth_impl(T input) {
+#if (__has_builtin(__builtin_spirv_fwidth))
+ return __builtin_spirv_fwidth(input);
+#else
+ T derivCoarseX = __builtin_hlsl_elementwise_deriv_coarse_x(input);
+ derivCoarseX = abs(derivCoarseX);
+ T derivCoarseY = __builtin_hlsl_elementwise_deriv_coarse_y(input);
+ derivCoarseY = abs(derivCoarseY);
+ return derivCoarseX + derivCoarseY;
+#endif
+}
----------------
Alexander-Johnston wrote:
Done
https://github.com/llvm/llvm-project/pull/161378
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