Implement the Barrier HLSL Function

[farzonl]

• Implement Barrier clang builtin,
• Link Barrier clang builtin with hlsl_intrinsics.h
• Add sema checks for Barrier to CheckHLSLBuiltinFunctionCall in SemaChecking.cpp
• Add codegen for Barrier to EmitHLSLBuiltinExpr in CGBuiltin.cpp
• Add codegen tests to clang/test/CodeGenHLSL/builtins/Barrier.hlsl
• Add sema tests to clang/test/SemaHLSL/BuiltIns/Barrier-errors.hlsl
• Create the int_dx_Barrier intrinsic in IntrinsicsDirectX.td
• Create the DXILOpMapping of int_dx_Barrier to 244 in DXIL.td
• Create the Barrier.ll and Barrier_errors.ll tests in llvm/test/CodeGen/DirectX/

DirectX

DXIL Opcode	DXIL OpName	Shader Model	Shader Stages
244	BarrierByMemoryType	6.8	()

SPIR-V

There is no support for Barrier when targeting SPIR-V.

Test Case(s)

Example 1

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

export void fn() {
	uint p1 = 1;
	uint p2 = 1;

    return Barrier(p1, p2);
}

Example 2

//dxc Barrier_1_test.hlsl -T lib_6_8 -enable-16bit-types -O0

export void fn() {
	uint p1 = 1;
	uint p2 = 1;

    return Barrier(p1, p2);
}

HLSL:

Syntax

void Barrier(uint MemoryTypeFlags, uint SemanticFlags);

void Barrier(NodeRecordOrUAV o, uint SemanticFlags);

Type Description

Name	Template Type	Component Type	Size
ret	void	void	0
MemoryTypeFlags	scalar	uint	1
SemanticFlags	scalar	uint	1

Type Description

Name	Template Type	Component Type	Size
ret	void	void	0
o	scalar		1
SemanticFlags	scalar	uint	1

Minimum Shader Model

This function is supported in the following shader models.

Shader Model	Supported
Shader Model 6.8 and higher shader models	yes

Shader Stages

See also

• Intrinsic Functions (DirectX HLSL)
• See Work Graphs Barrier Types

[farzonl]

@adam-yang After last week's refinement we have considered that your Barrier ticket should cover all the cases:

• Implement the GroupMemoryBarrier HLSL Function #99121
• Implement the DeviceMemoryBarrierWithGroupSync HLSL Function #99106
• Implement the DeviceMemoryBarrier HLSL Function #99105
• Implement the AllMemoryBarrierWithGroupSync HLSL Function #99090
• Implement the AllMemoryBarrier HLSL Function #99076