https://github.com/farzonl created
https://github.com/llvm/llvm-project/pull/151353
fixes #150673
fixes #150678
The issue was we were using the wrong return type.
>From f89ea77874da5f5964a857f6871476058a9bc673 Mon Sep 17 00:00:00 2001
From: Farzon Lotfi <farzonlo...@microsoft.com>
Date: Wed, 30 Jul 2025 11:32:38 -0400
Subject: [PATCH] [HLSL] fix D3DCOLORtoUBYTE4 return type to be int
fixes #150673
fixes #150678
The issue was we were using the wrong return type.
---
clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h | 2 +-
clang/lib/Headers/hlsl/hlsl_intrinsics.h | 2 +-
clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl | 8 ++++++++
3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h
b/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h
index e8ccccb489815..61919d9a17c6b 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsic_helpers.h
@@ -12,7 +12,7 @@
namespace hlsl {
namespace __detail {
-constexpr vector<uint, 4> d3d_color_to_ubyte4_impl(vector<float, 4> V) {
+constexpr vector<int, 4> d3d_color_to_ubyte4_impl(vector<float, 4> V) {
// Use the same scaling factor used by FXC, and DXC for DXIL
// (i.e., 255.001953)
//
https://github.com/microsoft/DirectXShaderCompiler/blob/070d0d5a2beacef9eeb51037a9b04665716fd6f3/lib/HLSL/HLOperationLower.cpp#L666C1-L697C2
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index 499a05328ee4f..d9d87c827e6a4 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -418,7 +418,7 @@ const inline float4 lit(float NDotL, float NDotH, float M) {
/// This function swizzles and scales components of the \a x parameter. Use
this
/// function to compensate for the lack of UBYTE4 support in some hardware.
-constexpr vector<uint, 4> D3DCOLORtoUBYTE4(vector<float, 4> V) {
+constexpr int4 D3DCOLORtoUBYTE4(float4 V) {
return __detail::d3d_color_to_ubyte4_impl(V);
}
diff --git a/clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
b/clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
index 990f0aa910f30..b78a007b67117 100644
--- a/clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
+++ b/clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
@@ -10,3 +10,11 @@ int4 test_D3DCOLORtoUBYTE4(float4 p1) {
// CHECK: ret [[INT_TYPE]] %[[SHUFFLED]]
return D3DCOLORtoUBYTE4(p1);
}
+
+// Note this test confirms issue 150673 is fixed
+// by confirming the negative does not become a poison
+// CHECK-LABEL: test_constant_inputs
+int4 test_constant_inputs() {
+ // CHECK: ret <4 x i32> <i32 -12877, i32 2833, i32 0, i32 25500>
+ return D3DCOLORtoUBYTE4(float4(0, 11.11, -50.5, 100));
+}
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