Implement the `degrees` HLSL Function

[farzonl]

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

DirectX

There were no DXIL opcodes found for degrees.

SPIR-V

Degrees:

Description:

Degrees

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

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

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

Number	Operand 1	Operand 2	Operand 3	Operand 4
12	<id> radians

Test Case(s)

Example 1

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

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

HLSL:

Converts the specified value from radians to degrees.

ret degrees(x)

Parameters

Item	Description
x	[in] The specified value.

Return Value

The result of converting the x parameter from radians to degrees.

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 2 (DirectX HLSL) and higher shader models	yes
Shader Model 1 (DirectX HLSL)	vs_1_1

See also

Intrinsic Functions (DirectX HLSL)