Implement the radians HLSL Function

[farzonl]

• Implement radians clang builtin,
• Link radians clang builtin with hlsl_intrinsics.h
• Add sema checks for radians to CheckHLSLBuiltinFunctionCall in SemaChecking.cpp
• Add codegen for radians to EmitHLSLBuiltinExpr in CGBuiltin.cpp
• Add codegen tests to clang/test/CodeGenHLSL/builtins/radians.hlsl
• Add sema tests to clang/test/SemaHLSL/BuiltIns/radians-errors.hlsl
• Create the int_spv_radians intrinsic in IntrinsicsSPIRV.td
• In SPIRVInstructionSelector.cpp create the radians lowering and map it to int_spv_radians in SPIRVInstructionSelector::selectIntrinsic.
• Create SPIR-V backend test case in llvm/test/CodeGen/SPIRV/hlsl-intrinsics/radians.ll

DirectX

There were no DXIL opcodes found for radians.

SPIR-V

Radians:

Description:

Radians

Converts degrees to radians, i.e., degrees * π / 180.

The operand degrees must be a scalar or vector whose component type is
16-bit or 32-bit floating-point.

Result Type and the type of degrees must be the same type. Results
are computed per component.

Number	Operand 1	Operand 2	Operand 3	Operand 4
11	<id> degrees

Test Case(s)

Example 1

//dxc radians_test.hlsl -T lib_6_8 -enable-16bit-types -O0

export float4 fn(float4 p1) {
    return radians(p1);
}

HLSL:

Converts the specified value from degrees to radians.

ret radians(x)

Parameters

Item	Description
x	[in] The specified value.

Return Value

The x parameter converted from degrees to radians.

Type Description

Name	Template Type	Component Type	Size
x	scalar, vector, or matrix	float	any
ret	same as input x	float	same dimension(s) as input x

Minimum Shader Model

This function is supported in the following shader models.

Shader Model	Supported
Shader Model 1 (DirectX HLSL) and higher shader models	yes

See also

Intrinsic Functions (DirectX HLSL)

[adam-yang]

I'll be working on this task.