From ef16da4479d9d2034f3b6072410b488d7568ce88 Mon Sep 17 00:00:00 2001
From: kmpeng <hi.kaitlin@gmail.com>
Date: Tue, 25 Feb 2025 14:50:09 -0800
Subject: [PATCH] start implementation

---
 clang/lib/Headers/hlsl/hlsl_detail.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/clang/lib/Headers/hlsl/hlsl_detail.h b/clang/lib/Headers/hlsl/hlsl_detail.h
index c691d85283de4..c6dd5494f149f 100644
--- a/clang/lib/Headers/hlsl/hlsl_detail.h
+++ b/clang/lib/Headers/hlsl/hlsl_detail.h
@@ -45,6 +45,20 @@ template <typename T> struct is_arithmetic {
   static const bool Value = __is_arithmetic(T);
 };
 
+template <typename T, int N>
+constexpr enable_if_t<is_same<float, T>::value || is_same<half, T>::value, T>
+fmod_vec_impl(vector<T, N> X, vector<T, N> Y) {
+#if !defined(__DirectX__)
+  return __builtin_elementwise_fmod(X, Y);
+#else 
+  vector<T, N> div = X / Y;
+  vector<T, N> result = __builtin_hlsl_elementwise_frac(__builtin_elementwise_abs(div)) * Y; 
+  vector<bool, N> condition = (div >= -div);
+  vector<T, N> realResult = __builtin_hlsl_select(condition, result, -result);
+  return realResult;
+#endif
+}
+
 } // namespace __detail
 } // namespace hlsl
 #endif //_HLSL_HLSL_DETAILS_H_