Implement the `NonUniformResourceIndex` HLSL Function

[farzonl]

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

DirectX

There were no DXIL opcodes found for NonUniformResourceIndex.

SPIR-V

OpCopyObject:

Description:

Make a copy of Operand. There are no pointer dereferences involved.

Result Type must equal Operand type. Result Type can be any type
except OpTypeVoid.

Word Count	Opcode	Results	Operands
4	83	<id> Result Type	Result <id>	<id> Operand

Test Case(s)

Example 1

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

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

HLSL:

Syntax

any<> NonUniformResourceIndex(any<> index);

Type Description

Name	Template Type	Component Type	Size
ret	scalar, vector, or matrix	bool, float, or int	any
index	scalar, vector, or matrix	bool, float, or int	any

Minimum Shader Model

This function is supported in the following shader models.

Shader Model	Supported
Shader Model 6 and higher shader models	yes

Shader Stages

See also

• Intrinsic Functions (DirectX HLSL)
• See NonUniformResourceIndex semantics
• Resource Binding.

[damyanp]

This needs further design work - NonUniformResourceIndex is interesting, and is only really expected to be used when accessing a resource array.