[HLSL] add cos library function

[bob80905]

Summary

This change exposes the cos library function for HLSL,
excluding long, int, and long long doubles.
Cos is supported for all scalar, vector, and matrix types.

Long and long long double support is missing in this patch because those types
don't exist in HLSL. Int is missing because the cos function only works on floating type arguments.

The full documentation of the HLSL cos function is available here:
https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-cos

[python3kgae]

clang/lib/Headers/hlsl/hlsl_intrinsics.h

113

why there're integer overloads?

[bob80905]

• remove int overloads

[python3kgae]

clang/test/CodeGenHLSL/builtins/cos.hlsl

12

We want to lower it into llvm::Intrinsic::cos.

You can add it in CodeGenFunction::EmitBuiltinExpr like how elementwise_ceil is lowered.
And add people who did the elementwise_ceil work to review. Better create another PR.

[bob80905]

• remove double

[bob80905]

• lower cos to llvm

[python3kgae]

In D134921#3828545, @bob80905 wrote:

• lower cos to llvm

This will affect things outside HLSL.
Please create a new PR without HLSL related part. Sorry I didn't make things clear before :(.

You can copy what https://github.com/llvm/llvm-project/commit/8680f951c21e675a110e79c9b8dc59bb94290b01 did when adding __builtin_elementwise_ceil
Also need to modify docs like https://github.com/llvm/llvm-project/commit/025988ded6b2a57022dbf9775f35a1a933584bfa

[bob80905]

revert revision, remove int overloads

[bob80905]

• remove int overloads
• remove double
• update tests after new builtin landed

[bob80905]

• clang format

clang/lib/Headers/hlsl/hlsl_intrinsics.h

 ceil(double);
 __attribute__((clang_builtin_alias(__builtin_elementwise_ceil)))
 double2 ceil(double2);
 __attribute__((clang_builtin_alias(__builtin_elementwise_ceil)))
 double3 ceil(double3);
 __attribute__((clang_builtin_alias(__builtin_elementwise_ceil)))
 double4 ceil(double4);
 
-} // namespace hlsl
+// cos builtins
+#ifdef __HLSL_ENABLE_16_BIT
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos))) half cos(half);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+half2 cos(half2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+half3 cos(half3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+half4 cos(half4);
+#endif
 
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos))) float
+cos(float);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+float2 cos(float2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+float3 cos(float3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+float4 cos(float4);
+
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos))) double
+cos(double);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+double2 cos(double2);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+double3 cos(double3);
+__attribute__((clang_builtin_alias(__builtin_elementwise_cos)))
+double4 cos(double4);
+
+} // namespace hlsl
 #endif //_HLSL_HLSL_INTRINSICS_H_

clang/test/CodeGenHLSL/builtins/cos.hlsl

+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -O3 -o - | FileCheck %s
+// RUN: %clang_cc1 -std=hlsl2021 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -D__HLSL_ENABLE_16_BIT -o - | FileCheck %s --check-prefix=NO_HALF
+
+// CHECK: define noundef half @
+// CHECK: call half @llvm.cos.f16(
+// NO_HALF: define noundef float @"?test_cos_half@@YA$halff@$halff@@Z"(
+// NO_HALF: call float @llvm.cos.f32(
+half test_cos_half ( half p0 ) {
+  return cos ( p0 );
+}
+// CHECK: define noundef <2 x half> @
+// CHECK: call <2 x half> @llvm.cos.v2f16
+// NO_HALF: define noundef <2 x float> @"?test_cos_float2@@YAT?$__vector@M$01@__clang@@T12@@Z"(
+// NO_HALF: call <2 x float> @llvm.cos.v2f32(
+half2 test_cos_half2 ( half2 p0 ) {
+  return cos ( p0 );
+}
+// CHECK: define noundef <3 x half> @
+// CHECK: call <3 x half> @llvm.cos.v3f16
+// NO_HALF: define noundef <3 x float> @"?test_cos_float3@@YAT?$__vector@M$02@__clang@@T12@@Z"(
+// NO_HALF: call <3 x float> @llvm.cos.v3f32(
+half3 test_cos_half3 ( half3 p0 ) {
+  return cos ( p0 );
+}
+// CHECK: define noundef <4 x half> @
+// CHECK: call <4 x half> @llvm.cos.v4f16
+// NO_HALF: define noundef <4 x float> @"?test_cos_float4@@YAT?$__vector@M$03@__clang@@T12@@Z"(
+// NO_HALF: call <4 x float> @llvm.cos.v4f32(
+half4 test_cos_half4 ( half4 p0 ) {
+  return cos ( p0 );
+}
+
+// CHECK: define noundef float @
+// CHECK: call float @llvm.cos.f32(
+float test_cos_float ( float p0 ) {
+  return cos ( p0 );
+}
+// CHECK: define noundef <2 x float> @
+// CHECK: call <2 x float> @llvm.cos.v2f32
+float2 test_cos_float2 ( float2 p0 ) {
+  return cos ( p0 );
+}
+// CHECK: define noundef <3 x float> @
+// CHECK: call <3 x float> @llvm.cos.v3f32
+float3 test_cos_float3 ( float3 p0 ) {
+  return cos ( p0 );
+}
+// CHECK: define noundef <4 x float> @
+// CHECK: call <4 x float> @llvm.cos.v4f32
+float4 test_cos_float4 ( float4 p0 ) {
+  return cos ( p0 );
+}