[clang] [HLSL] Remove double pow intrinsics (PR #86407)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-backend-x86

Author: Robin Caloudis (robincaloudis)

<details>
<summary>Changes</summary>

This change removes the pow intrinsics with parameters of type double as it is not available in the DCX (trunk) compiler.

Introduced during https://github.com/llvm/llvm-project/commit/df5137e984a607248cd31ed67aa3822e8ac2a083.

Documentation for HLSL pow function is available here: https://learn.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-pow#parameters

Closes https://github.com/llvm/llvm-project/issues/86181

---
Full diff: https://github.com/llvm/llvm-project/pull/86407.diff


2 Files Affected:

- (modified) clang/lib/Headers/hlsl/hlsl_intrinsics.h (-9) 
- (modified) clang/test/CodeGenHLSL/builtins/pow.hlsl (-13) 


``````````diff
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index 5e703772b7ee4f..0d6baccd7c0ac9 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -1174,15 +1174,6 @@ float3 pow(float3, float3);
 _HLSL_BUILTIN_ALIAS(__builtin_elementwise_pow)
 float4 pow(float4, float4);
 
-_HLSL_BUILTIN_ALIAS(__builtin_elementwise_pow)
-double pow(double, double);
-_HLSL_BUILTIN_ALIAS(__builtin_elementwise_pow)
-double2 pow(double2, double2);
-_HLSL_BUILTIN_ALIAS(__builtin_elementwise_pow)
-double3 pow(double3, double3);
-_HLSL_BUILTIN_ALIAS(__builtin_elementwise_pow)
-double4 pow(double4, double4);
-
 //===----------------------------------------------------------------------===//
 // reversebits builtins
 //===----------------------------------------------------------------------===//
diff --git a/clang/test/CodeGenHLSL/builtins/pow.hlsl b/clang/test/CodeGenHLSL/builtins/pow.hlsl
index e996ca2f336410..057cd7215aa5af 100644
--- a/clang/test/CodeGenHLSL/builtins/pow.hlsl
+++ b/clang/test/CodeGenHLSL/builtins/pow.hlsl
@@ -39,16 +39,3 @@ float3 test_pow_float3(float3 p0, float3 p1) { return pow(p0, p1); }
 // CHECK: define noundef <4 x float> @"?test_pow_float4
 // CHECK: call <4 x float> @llvm.pow.v4f32
 float4 test_pow_float4(float4 p0, float4 p1) { return pow(p0, p1); }
-
-// CHECK: define noundef double @"?test_pow_double@@YANNN at Z"(
-// CHECK: call double @llvm.pow.f64(
-double test_pow_double(double p0, double p1) { return pow(p0, p1); }
-// CHECK: define noundef <2 x double> @"?test_pow_double2@@YAT?$__vector at N$01 at __clang@@T12 at 0@Z"(
-// CHECK: call <2 x double> @llvm.pow.v2f64
-double2 test_pow_double2(double2 p0, double2 p1) { return pow(p0, p1); }
-// CHECK: define noundef <3 x double> @"?test_pow_double3@@YAT?$__vector at N$02 at __clang@@T12 at 0@Z"(
-// CHECK: call <3 x double> @llvm.pow.v3f64
-double3 test_pow_double3(double3 p0, double3 p1) { return pow(p0, p1); }
-// CHECK: define noundef <4 x double> @"?test_pow_double4@@YAT?$__vector at N$03 at __clang@@T12 at 0@Z"(
-// CHECK: call <4 x double> @llvm.pow.v4f64
-double4 test_pow_double4(double4 p0, double4 p1) { return pow(p0, p1); }

``````````

</details>


https://github.com/llvm/llvm-project/pull/86407