[HLSL] Implement SV_GroupThreadId semantic

Support SV_GroupThreadId attribute.
Translate it into dx.thread.id.in.group in clang codeGen.

Fixes: #70122

Author: lizhengxing

clang/include/clang/Basic/Attr.td

@@ -4621,6 +4621,13 @@ def HLSLNumThreads: InheritableAttr {
   let Documentation = [NumThreadsDocs];
 }
 
+def HLSLSV_GroupThreadID: HLSLAnnotationAttr {
+  let Spellings = [HLSLAnnotation<"SV_GroupThreadID">];
+  let Subjects = SubjectList<[ParmVar, Field]>;
+  let LangOpts = [HLSL];
+  let Documentation = [HLSLSV_GroupThreadIDDocs];
+}
+
 def HLSLSV_GroupID: HLSLAnnotationAttr {
   let Spellings = [HLSLAnnotation<"SV_GroupID">];
   let Subjects = SubjectList<[ParmVar, Field]>;

clang/include/clang/Basic/AttrDocs.td

@@ -7934,6 +7934,17 @@ randomized.
   }];
 }
 
+def HLSLSV_GroupThreadIDDocs : Documentation {
+  let Category = DocCatFunction;
+  let Content = [{
+The ``SV_GroupThreadID`` semantic, when applied to an input parameter, specifies which
+individual thread within a thread group is executing in. This attribute is
+only supported in compute shaders.
+
+The full documentation is available here: https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/sv-groupthreadid
+  }];
+}
+
 def HLSLSV_GroupIDDocs : Documentation {
   let Category = DocCatFunction;
   let Content = [{

clang/include/clang/Sema/SemaHLSL.h

@@ -119,6 +119,7 @@ class SemaHLSL : public SemaBase {
   void handleNumThreadsAttr(Decl *D, const ParsedAttr &AL);
   void handleWaveSizeAttr(Decl *D, const ParsedAttr &AL);
   void handleSV_DispatchThreadIDAttr(Decl *D, const ParsedAttr &AL);
+  void handleSV_GroupThreadIDAttr(Decl *D, const ParsedAttr &AL);
   void handleSV_GroupIDAttr(Decl *D, const ParsedAttr &AL);
   void handlePackOffsetAttr(Decl *D, const ParsedAttr &AL);
   void handleShaderAttr(Decl *D, const ParsedAttr &AL);

clang/lib/CodeGen/CGHLSLRuntime.cpp

@@ -389,6 +389,11 @@ llvm::Value *CGHLSLRuntime::emitInputSemantic(IRBuilder<> &B,
         CGM.getIntrinsic(getThreadIdIntrinsic());
     return buildVectorInput(B, ThreadIDIntrinsic, Ty);
   }
+  if (D.hasAttr<HLSLSV_GroupThreadIDAttr>()) {
+    llvm::Function *GroupThreadIDIntrinsic =
+        CGM.getIntrinsic(Intrinsic::dx_thread_id_in_group);
+    return buildVectorInput(B, GroupThreadIDIntrinsic, Ty);
+  }
   if (D.hasAttr<HLSLSV_GroupIDAttr>()) {
     llvm::Function *GroupIDIntrinsic = CGM.getIntrinsic(Intrinsic::dx_group_id);
     return buildVectorInput(B, GroupIDIntrinsic, Ty);

clang/lib/Parse/ParseHLSL.cpp

@@ -280,6 +280,7 @@ void Parser::ParseHLSLAnnotations(ParsedAttributes &Attrs,
   case ParsedAttr::UnknownAttribute:
     Diag(Loc, diag::err_unknown_hlsl_semantic) << II;
     return;
+  case ParsedAttr::AT_HLSLSV_GroupThreadID:
   case ParsedAttr::AT_HLSLSV_GroupID:
   case ParsedAttr::AT_HLSLSV_GroupIndex:
   case ParsedAttr::AT_HLSLSV_DispatchThreadID:

clang/lib/Sema/SemaDeclAttr.cpp

@@ -7103,6 +7103,9 @@ ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D, const ParsedAttr &AL,
   case ParsedAttr::AT_HLSLWaveSize:
     S.HLSL().handleWaveSizeAttr(D, AL);
     break;
+  case ParsedAttr::AT_HLSLSV_GroupThreadID:
+    S.HLSL().handleSV_GroupThreadIDAttr(D, AL);
+    break;
   case ParsedAttr::AT_HLSLSV_GroupID:
     S.HLSL().handleSV_GroupIDAttr(D, AL);
     break;

clang/lib/Sema/SemaHLSL.cpp

@@ -434,6 +434,7 @@ void SemaHLSL::CheckSemanticAnnotation(
   switch (AnnotationAttr->getKind()) {
   case attr::HLSLSV_DispatchThreadID:
   case attr::HLSLSV_GroupIndex:
+  case attr::HLSLSV_GroupThreadID:
   case attr::HLSLSV_GroupID:
     if (ST == llvm::Triple::Compute)
       return;
@@ -787,6 +788,15 @@ void SemaHLSL::handleSV_DispatchThreadIDAttr(Decl *D, const ParsedAttr &AL) {
                  HLSLSV_DispatchThreadIDAttr(getASTContext(), AL));
 }
 
+void SemaHLSL::handleSV_GroupThreadIDAttr(Decl *D, const ParsedAttr &AL) {
+  auto *VD = cast<ValueDecl>(D);
+  if (!diagnoseInputIDType(VD->getType(), AL))
+    return;
+
+  D->addAttr(::new (getASTContext())
+                 HLSLSV_GroupThreadIDAttr(getASTContext(), AL));
+}
+
 void SemaHLSL::handleSV_GroupIDAttr(Decl *D, const ParsedAttr &AL) {
   auto *VD = cast<ValueDecl>(D);
   if (!diagnoseInputIDType(VD->getType(), AL))

clang/test/CodeGenHLSL/semantics/SV_GroupThreadID.hlsl

@@ -0,0 +1,32 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-library -x hlsl -emit-llvm -finclude-default-header -disable-llvm-passes -o - %s | FileCheck %s
+
+// Make sure SV_GroupThreadID translated into dx.thread.id.in.group.
+
+// CHECK:  define void @foo()
+// CHECK:  %[[#ID:]] = call i32 @llvm.dx.thread.id.in.group(i32 0)
+// CHECK:  call void @{{.*}}foo{{.*}}(i32 %[[#ID]])
+[shader("compute")]
+[numthreads(8,8,1)]
+void foo(uint Idx : SV_GroupThreadID) {}
+
+// CHECK:  define void @bar()
+// CHECK:  %[[#ID_X:]] = call i32 @llvm.dx.thread.id.in.group(i32 0)
+// CHECK:  %[[#ID_X_:]] = insertelement <2 x i32> poison, i32 %[[#ID_X]], i64 0
+// CHECK:  %[[#ID_Y:]] = call i32 @llvm.dx.thread.id.in.group(i32 1)
+// CHECK:  %[[#ID_XY:]] = insertelement <2 x i32> %[[#ID_X_]], i32 %[[#ID_Y]], i64 1
+// CHECK:  call void @{{.*}}bar{{.*}}(<2 x i32> %[[#ID_XY]])
+[shader("compute")]
+[numthreads(8,8,1)]
+void bar(uint2 Idx : SV_GroupThreadID) {}
+
+// CHECK:  define void @test()
+// CHECK:  %[[#ID_X:]] = call i32 @llvm.dx.thread.id.in.group(i32 0)
+// CHECK:  %[[#ID_X_:]] = insertelement <3 x i32> poison, i32 %[[#ID_X]], i64 0
+// CHECK:  %[[#ID_Y:]] = call i32 @llvm.dx.thread.id.in.group(i32 1)
+// CHECK:  %[[#ID_XY:]] = insertelement <3 x i32> %[[#ID_X_]], i32 %[[#ID_Y]], i64 1
+// CHECK:  %[[#ID_Z:]] = call i32 @llvm.dx.thread.id.in.group(i32 2)
+// CHECK:  %[[#ID_XYZ:]] = insertelement <3 x i32> %[[#ID_XY]], i32 %[[#ID_Z]], i64 2
+// CHECK:  call void @{{.*}}test{{.*}}(<3 x i32> %[[#ID_XYZ]])
+[shader("compute")]
+[numthreads(8,8,1)]
+void test(uint3 Idx : SV_GroupThreadID) {}

clang/test/SemaHLSL/Semantics/entry_parameter.hlsl

@@ -2,15 +2,18 @@
 // RUN: %clang_cc1 -triple dxil-pc-shadermodel6.0-mesh -hlsl-entry CSMain -x hlsl -finclude-default-header  -verify -o - %s
 
 [numthreads(8,8,1)]
-// expected-error@+3 {{attribute 'SV_GroupIndex' is unsupported in 'mesh' shaders, requires compute}}
-// expected-error@+2 {{attribute 'SV_DispatchThreadID' is unsupported in 'mesh' shaders, requires compute}}
-// expected-error@+1 {{attribute 'SV_GroupID' is unsupported in 'mesh' shaders, requires compute}}
-void CSMain(int GI : SV_GroupIndex, uint ID : SV_DispatchThreadID, uint GID : SV_GroupID) {
-// CHECK: FunctionDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> line:[[@LINE-1]]:6 CSMain 'void (int, uint, uint)'
+// expected-error@+4 {{attribute 'SV_GroupIndex' is unsupported in 'mesh' shaders, requires compute}}
+// expected-error@+3 {{attribute 'SV_DispatchThreadID' is unsupported in 'mesh' shaders, requires compute}}
+// expected-error@+2 {{attribute 'SV_GroupID' is unsupported in 'mesh' shaders, requires compute}}
+// expected-error@+1 {{attribute 'SV_GroupThreadID' is unsupported in 'mesh' shaders, requires compute}}
+void CSMain(int GI : SV_GroupIndex, uint ID : SV_DispatchThreadID, uint GID : SV_GroupID, uint GThreadID : SV_GroupThreadID) {
+// CHECK: FunctionDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> line:[[@LINE-1]]:6 CSMain 'void (int, uint, uint, uint)'
 // CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:17 GI 'int'
 // CHECK-NEXT: HLSLSV_GroupIndexAttr
 // CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:42 ID 'uint'
 // CHECK-NEXT: HLSLSV_DispatchThreadIDAttr
 // CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:73 GID 'uint'
 // CHECK-NEXT: HLSLSV_GroupIDAttr
+// CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:96 GThreadID 'uint'
+// CHECK-NEXT: HLSLSV_GroupThreadIDAttr
 }

clang/test/SemaHLSL/Semantics/invalid_entry_parameter.hlsl

@@ -49,3 +49,25 @@ struct ST2_GID {
     static uint GID : SV_GroupID;
     uint s_gid : SV_GroupID;
 };
+
+[numthreads(8,8,1)]
+// expected-error@+1 {{attribute 'SV_GroupThreadID' only applies to a field or parameter of type 'uint/uint2/uint3'}}
+void CSMain_GThreadID(float ID : SV_GroupThreadID) {
+}
+
+[numthreads(8,8,1)]
+// expected-error@+1 {{attribute 'SV_GroupThreadID' only applies to a field or parameter of type 'uint/uint2/uint3'}}
+void CSMain2_GThreadID(ST GID : SV_GroupThreadID) {
+
+}
+
+void foo_GThreadID() {
+// expected-warning@+1 {{'SV_GroupThreadID' attribute only applies to parameters and non-static data members}}
+  uint GThreadIS : SV_GroupThreadID;
+}
+
+struct ST2_GThreadID {
+// expected-warning@+1 {{'SV_GroupThreadID' attribute only applies to parameters and non-static data members}}
+    static uint GThreadID : SV_GroupThreadID;
+    uint s_gthreadid : SV_GroupThreadID;
+};

clang/test/SemaHLSL/Semantics/valid_entry_parameter.hlsl

@@ -49,3 +49,28 @@ void CSMain3_GID(uint3 : SV_GroupID) {
 // CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:24 'uint3'
 // CHECK-NEXT: HLSLSV_GroupIDAttr
 }
+
+[numthreads(8,8,1)]
+void CSMain_GThreadID(uint ID : SV_GroupThreadID) {
+// CHECK: FunctionDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> line:[[@LINE-1]]:6 CSMain_GThreadID 'void (uint)'
+// CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:28 ID 'uint'
+// CHECK-NEXT: HLSLSV_GroupThreadIDAttr
+}
+[numthreads(8,8,1)]
+void CSMain1_GThreadID(uint2 ID : SV_GroupThreadID) {
+// CHECK: FunctionDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> line:[[@LINE-1]]:6 CSMain1_GThreadID 'void (uint2)'
+// CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:30 ID 'uint2'
+// CHECK-NEXT: HLSLSV_GroupThreadIDAttr
+}
+[numthreads(8,8,1)]
+void CSMain2_GThreadID(uint3 ID : SV_GroupThreadID) {
+// CHECK: FunctionDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> line:[[@LINE-1]]:6 CSMain2_GThreadID 'void (uint3)'
+// CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:30 ID 'uint3'
+// CHECK-NEXT: HLSLSV_GroupThreadIDAttr
+}
+[numthreads(8,8,1)]
+void CSMain3_GThreadID(uint3 : SV_GroupThreadID) {
+// CHECK: FunctionDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> line:[[@LINE-1]]:6 CSMain3_GThreadID 'void (uint3)'
+// CHECK-NEXT: ParmVarDecl 0x{{[0-9a-fA-F]+}} <{{.*}}> col:30 'uint3'
+// CHECK-NEXT: HLSLSV_GroupThreadIDAttr
+}