[clang] adding `asfloat` function to hlsl (PR #107614)

[via cfe-commits]

https://github.com/joaosaffran created https://github.com/llvm/llvm-project/pull/107614

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>From eb176f0cef8943ae5ae9d64d71d01649dd30fd93 Mon Sep 17 00:00:00 2001
From: Joao Saffran <jderezende at microsoft.com>
Date: Fri, 6 Sep 2024 16:27:51 +0000
Subject: [PATCH] adding  asfloat function to hlsl

---
 clang/lib/Headers/hlsl/hlsl_intrinsics.h    | 13 +++++++++++
 clang/test/CodeGenHLSL/builtins/asuint.hlsl | 26 +++++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 clang/test/CodeGenHLSL/builtins/asuint.hlsl

diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index 5c08a45a35377d..195777f5b15823 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -391,6 +391,19 @@ float4 asin(float4);
 // atan builtins
 //===----------------------------------------------------------------------===//
 
+__attribute__((__always_inline__, __nodebug__))
+ static inline float asfloat(int __A) {
+  return __builtin_bit_cast(float, __A); // no-warning
+}
+
+ template<int N>
+__attribute__((__always_inline__, __nodebug__))
+ static inline vector<float, N> asfloat(vector<int, N> V) {
+  return __builtin_bit_cast(vector<float, N>, V);
+}
+
+
+
 /// \fn T atan(T Val)
 /// \brief Returns the arctangent of the input value, \a Val.
 /// \param Val The input value.
diff --git a/clang/test/CodeGenHLSL/builtins/asuint.hlsl b/clang/test/CodeGenHLSL/builtins/asuint.hlsl
new file mode 100644
index 00000000000000..3bbd49fa964824
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/asuint.hlsl
@@ -0,0 +1,26 @@
+// // RUN: %clang_cc1 -finclude-default-header -x hlsl -triple dxil-pc-shadermodel6.3-library %s -fnative-half-type -emit-llvm -disable-llvm-passes -o - | FileCheck %s
+
+
+// CHECK-LABEL: test_asuint4_uint
+// CHECK: ret i32 %0
+export uint test_asuint4_uint(uint p0) {
+  return asuint(p0);
+}
+
+// CHECK-LABEL: test_asuint4_int
+// CHECK: %splat.splatinsert = insertelement <4 x i32> poison, i32 %0, i64 0
+export uint4 test_asuint4_int(int p0) {
+  return asuint(p0);
+}
+
+// CHECK-LABEL: test_asuint_float
+// CHECK: %1 = bitcast float %0 to i32
+export uint test_asuint_float(float p0) {
+  return asuint(p0);
+}
+
+// CHECK-LABEL: test_asuint_float
+// CHECK: %1 = bitcast <4 x float> %0 to <4 x i32>
+export uint4 test_asuint_float4(float4 p0) {
+  return asuint(p0);
+}
\ No newline at end of file