https://github.com/joaosaffran updated
https://github.com/llvm/llvm-project/pull/108686
>From b52c5ec306f41214e6cdeb6cd1f035ccabfccdf8 Mon Sep 17 00:00:00 2001
From: Joao Saffran <jdereze...@microsoft.com>
Date: Sat, 14 Sep 2024 06:23:08 +0000
Subject: [PATCH] implementing asfloat using bit_cast
---
clang/lib/Headers/hlsl/hlsl_intrinsics.h | 17 ++++++++
clang/test/CodeGenHLSL/builtins/asfloat.hlsl | 40 +++++++++++++++++++
.../SemaHLSL/BuiltIns/asfloat-errors.hlsl | 35 ++++++++++++++++
3 files changed, 92 insertions(+)
create mode 100644 clang/test/CodeGenHLSL/builtins/asfloat.hlsl
create mode 100644 clang/test/SemaHLSL/BuiltIns/asfloat-errors.hlsl
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index b5c22f7c91b2d6..cb8e1119e9b4e8 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -361,6 +361,23 @@ bool any(double3);
_HLSL_BUILTIN_ALIAS(__builtin_hlsl_any)
bool any(double4);
+//===----------------------------------------------------------------------===//
+// asfloat builtins
+//===----------------------------------------------------------------------===//
+
+/// \fn uint asfloat(T Val)
+/// \brief Interprets the bit pattern of x as an unsigned integer.
+/// \param Val The input value.
+
+template <typename T, int N>
+_HLSL_INLINE vector<float, N> asfloat(vector<T, N> V) {
+ return __detail::bit_cast<float, T, N>(V);
+}
+
+template <typename T> _HLSL_INLINE float asfloat(T F) {
+ return __detail::bit_cast<float, T>(F);
+}
+
//===----------------------------------------------------------------------===//
// asin builtins
//===----------------------------------------------------------------------===//
diff --git a/clang/test/CodeGenHLSL/builtins/asfloat.hlsl
b/clang/test/CodeGenHLSL/builtins/asfloat.hlsl
new file mode 100644
index 00000000000000..59fc15fa60b1e5
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/asfloat.hlsl
@@ -0,0 +1,40 @@
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple
dxil-pc-shadermodel6.3-library %s -fnative-half-type -emit-llvm -O1 -o - |
FileCheck %s
+
+// CHECK: define {{.*}}test_uint{{.*}}(i32 {{.*}} [[VAL:%.*]]){{.*}}
+// CHECK: bitcast i32 [[VAL]] to float
+float test_uint(uint p0) {
+ return asfloat(p0);
+}
+
+// CHECK: define {{.*}}test_int{{.*}}(i32 {{.*}} [[VAL:%.*]]){{.*}}
+// CHECK: bitcast i32 [[VAL]] to float
+float test_int(int p0) {
+ return asfloat(p0);
+}
+
+// CHECK: define {{.*}}test_float{{.*}}(float {{.*}} [[VAL:%.*]]){{.*}}
+// CHECK-NOT: bitcast
+// CHECK: ret float [[VAL]]
+float test_float(float p0) {
+ return asfloat(p0);
+}
+
+// CHECK: define {{.*}}test_vector_uint{{.*}}(<4 x i32> {{.*}}
[[VAL:%.*]]){{.*}}
+// CHECK: bitcast <4 x i32> [[VAL]] to <4 x float>
+
+float4 test_vector_uint(uint4 p0) {
+ return asfloat(p0);
+}
+
+// CHECK: define {{.*}}test_vector_int{{.*}}(<4 x i32> {{.*}}
[[VAL:%.*]]){{.*}}
+// CHECK: bitcast <4 x i32> [[VAL]] to <4 x float>
+float4 test_vector_int(int4 p0) {
+ return asfloat(p0);
+}
+
+// CHECK: define {{.*}}test_vector_float{{.*}}(<4 x float> {{.*}}
[[VAL:%.*]]){{.*}}
+// CHECK-NOT: bitcast
+// CHECK: ret <4 x float> [[VAL]]
+float4 test_vector_float(float4 p0) {
+ return asfloat(p0);
+}
diff --git a/clang/test/SemaHLSL/BuiltIns/asfloat-errors.hlsl
b/clang/test/SemaHLSL/BuiltIns/asfloat-errors.hlsl
new file mode 100644
index 00000000000000..16273a513c41e6
--- /dev/null
+++ b/clang/test/SemaHLSL/BuiltIns/asfloat-errors.hlsl
@@ -0,0 +1,35 @@
+// RUN: %clang_cc1 -finclude-default-header -triple
dxil-pc-shadermodel6.6-library %s -fnative-half-type -verify
+
+
+float4 test_float_too_many_arg(float p0, float p1) {
+ return asfloat(p0, p1);
+ // expected-error@-1 {{no matching function for call to 'asfloat'}}
+ // expected-note@hlsl/hlsl_intrinsics.h:* {{candidate function template not
viable: requires single argument 'V', but 2 arguments were provided}}
+ // expected-note@hlsl/hlsl_intrinsics.h:* {{candidate function template not
viable: requires single argument 'F', but 2 arguments were provided}}
+}
+
+
+float test_float_double(double p1) {
+ return asfloat(p1);
+ // expected-error@hlsl/hlsl_intrinsics.h:* {{no matching function for call
to 'bit_cast'}}
+ // expected-note@-2 {{in instantiation of function template specialization
'hlsl::asfloat<double>'}}
+ // expected-note@hlsl/hlsl_detail.h:* {{candidate template ignored: could
not match 'vector<double, N>' against 'double'}}
+ // expected-note@hlsl/hlsl_detail.h:* {{candidate template ignored:
substitution failure [with U = float, T = double]: no type named 'Type'}}
+}
+
+float test_float_half(half p1) {
+ return asfloat(p1);
+ // expected-error@hlsl/hlsl_intrinsics.h:* {{no matching function for call
to 'bit_cast'}}
+ // expected-note@-2 {{in instantiation of function template specialization
'hlsl::asfloat<half>'}}
+ // expected-note@hlsl/hlsl_detail.h:* {{candidate template ignored: could
not match 'vector<half, N>' against 'half'}}
+ // expected-note@hlsl/hlsl_detail.h:* {{candidate template ignored:
substitution failure [with U = float, T = half]: no type named 'Type'}}
+}
+
+
+float test_float_half(bool p1) {
+ return asfloat(p1);
+ // expected-error@hlsl/hlsl_intrinsics.h:* {{no matching function for call
to 'bit_cast'}}
+ // expected-note@-2 {{in instantiation of function template specialization
'hlsl::asfloat<bool>'}}
+ // expected-note@hlsl/hlsl_detail.h:* {{candidate template ignored: could
not match 'vector<bool, N>' against 'bool'}}
+ // expected-note@hlsl/hlsl_detail.h:* {{candidate template ignored:
substitution failure [with U = float, T = bool]: no type named 'Type'}}
+}
\ No newline at end of file
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