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[HLSL][SPIRV] Allow large z value in numthreads #144934

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Merged
merged 1 commit into from
Jun 23, 2025
+17 −6
Merged

[HLSL][SPIRV] Allow large z value in numthreads #144934

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7 changes: 5 additions & 2 deletions clang/lib/Sema/SemaHLSL.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1033,12 +1033,15 @@ void SemaHLSL::handleRootSignatureAttr(Decl *D, const ParsedAttr &AL) {
void SemaHLSL::handleNumThreadsAttr(Decl *D, const ParsedAttr &AL) {
llvm::VersionTuple SMVersion =
getASTContext().getTargetInfo().getTriple().getOSVersion();
bool IsDXIL = getASTContext().getTargetInfo().getTriple().getArch() ==
llvm::Triple::dxil;

uint32_t ZMax = 1024;
uint32_t ThreadMax = 1024;
if (SMVersion.getMajor() <= 4) {
if (IsDXIL && SMVersion.getMajor() <= 4) {
ZMax = 1;
ThreadMax = 768;
} else if (SMVersion.getMajor() == 5) {
} else if (IsDXIL && SMVersion.getMajor() == 5) {
ZMax = 64;
ThreadMax = 1024;
}
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16 changes: 12 additions & 4 deletions clang/test/SemaHLSL/num_threads.hlsl
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Expand Up @@ -10,6 +10,8 @@
// RUN: %clang_cc1 -triple dxil-pc-shadermodel5.0-compute -x hlsl -ast-dump -o - %s -DFAIL -verify
// RUN: %clang_cc1 -triple dxil-pc-shadermodel4.0-compute -x hlsl -ast-dump -o - %s -DFAIL -verify

// RUN: %clang_cc1 -triple spirv-pc-vulkan1.3-compute -x hlsl -ast-dump -o - %s | FileCheck %s --check-prefixes=CHECK,CHECK-SPIRV

#if __SHADER_TARGET_STAGE == __SHADER_STAGE_COMPUTE || __SHADER_TARGET_STAGE == __SHADER_STAGE_MESH || __SHADER_TARGET_STAGE == __SHADER_STAGE_AMPLIFICATION || __SHADER_TARGET_STAGE == __SHADER_STAGE_LIBRARY
#ifdef FAIL

Expand Down Expand Up @@ -88,24 +90,30 @@ int entry() {

// Because these two attributes match, they should both appear in the AST
[numthreads(2,2,1)]
// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:90:2, col:18> 2 2 1
// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:{{[0-9]+}}:2, col:18> 2 2 1
int secondFn();

[numthreads(2,2,1)]
// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:94:2, col:18> 2 2 1
// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:{{[0-9]+}}:2, col:18> 2 2 1
int secondFn() {
return 1;
}

[numthreads(4,2,1)]
// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:100:2, col:18> 4 2 1
// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:{{[0-9]+}}:2, col:18> 4 2 1
int onlyOnForwardDecl();

// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:100:2, col:18> Inherited 4 2 1
// CHECK: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:{{[0-9]+}}:2, col:18> Inherited 4 2 1
int onlyOnForwardDecl() {
return 1;
}

#ifdef __spirv__
[numthreads(4,2,128)]
// CHECK-SPIRV: HLSLNumThreadsAttr 0x{{[0-9a-fA-F]+}} <line:{{[0-9]+}}:2, col:20> 4 2 128
int largeZ();
#endif

#else // Vertex and Pixel only beyond here
// expected-error-re@+1 {{attribute 'numthreads' is unsupported in '{{[A-Za-z]+}}' shaders, requires one of the following: compute, amplification, mesh}}
[numthreads(1,1,1)]
Expand Down
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