[HLSL] clang codeGen for HLSLNumThreadsAttr

Translate HLSLNumThreadsAttr into function attribute with name "dx.numthreads" and value format as "x,y,z".

Reviewed By: beanz

Differential Revision: https://reviews.llvm.org/D131799

clang/lib/CodeGen/CGHLSLRuntime.cpp

@@ -19,6 +19,7 @@
 #include "llvm/IR/IntrinsicsDirectX.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/IR/Module.h"
+#include "llvm/Support/FormatVariadic.h"
 
 using namespace clang;
 using namespace CodeGen;
@@ -107,6 +108,13 @@ void clang::CodeGen::CGHLSLRuntime::setHLSLEntryAttributes(
   const StringRef ShaderAttrKindStr = "hlsl.shader";
   Fn->addFnAttr(ShaderAttrKindStr,
                 ShaderAttr->ConvertShaderTypeToStr(ShaderAttr->getType()));
+  if (HLSLNumThreadsAttr *NumThreadsAttr = FD->getAttr<HLSLNumThreadsAttr>()) {
+    const StringRef NumThreadsKindStr = "hlsl.numthreads";
+    std::string NumThreadsStr =
+        formatv("{0},{1},{2}", NumThreadsAttr->getX(), NumThreadsAttr->getY(),
+                NumThreadsAttr->getZ());
+    Fn->addFnAttr(NumThreadsKindStr, NumThreadsStr);
+  }
 }
 
 llvm::Value *CGHLSLRuntime::emitInputSemantic(IRBuilder<> &B,

clang/test/CodeGenHLSL/entry.hlsl

@@ -4,9 +4,10 @@
 
 // Make sure not mangle entry.
 // CHECK:define void @foo()
-// Make sure add function attribute.
+// Make sure add function attribute and numthreads attribute.
+// CHECK:"hlsl.numthreads"="16,8,1"
 // CHECK:"hlsl.shader"="compute"
-[numthreads(1,1,1)]
+[numthreads(16,8,1)]
 void foo() {
 
 }