[clang] [HLSL] Implement HLSL splatting (PR #118992)

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git-clang-format --diff 2feced1df0aa01f78501720b98faa985bcec846a cadd309a7d7c61a592d11cb306d44139df8d15ee --extensions cpp,h -- clang/include/clang/Sema/SemaHLSL.h clang/lib/AST/Expr.cpp clang/lib/AST/ExprConstant.cpp clang/lib/CodeGen/CGExpr.cpp clang/lib/CodeGen/CGExprAgg.cpp clang/lib/CodeGen/CGExprComplex.cpp clang/lib/CodeGen/CGExprConstant.cpp clang/lib/CodeGen/CGExprScalar.cpp clang/lib/Edit/RewriteObjCFoundationAPI.cpp clang/lib/Sema/Sema.cpp clang/lib/Sema/SemaCast.cpp clang/lib/Sema/SemaHLSL.cpp clang/lib/StaticAnalyzer/Core/ExprEngineC.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index 36557ccb15..69e7766764 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -996,7 +996,7 @@ void AggExprEmitter::VisitCastExpr(CastExpr *E) {
     Address DestVal = Dest.getAddress();
     SourceLocation Loc = E->getExprLoc();
 
-    assert (RV.isScalar() && "RHS of HLSL splat cast must be a scalar.");
+    assert(RV.isScalar() && "RHS of HLSL splat cast must be a scalar.");
     llvm::Value *SrcVal = RV.getScalarVal();
     EmitHLSLSplatCast(CGF, DestVal, DestTy, SrcVal, SrcTy, Loc);
     break;
diff --git a/clang/lib/CodeGen/CGExprScalar.cpp b/clang/lib/CodeGen/CGExprScalar.cpp
index b09c18f4a1..cd7d9c243f 100644
--- a/clang/lib/CodeGen/CGExprScalar.cpp
+++ b/clang/lib/CodeGen/CGExprScalar.cpp
@@ -2797,7 +2797,8 @@ Value *ScalarExprEmitter::VisitCastExpr(CastExpr *CE) {
   }
   case CK_HLSLSplatCast: {
     // This cast should only handle splatting from vectors of length 1.
-    // But in Sema a cast should have been inserted to convert the vec1 to a scalar
+    // But in Sema a cast should have been inserted to convert the vec1 to a
+    // scalar
     assert(DestTy->isVectorType() && "Destination type must be a vector.");
     auto *DestVecTy = DestTy->getAs<VectorType>();
     QualType SrcTy = E->getType();
diff --git a/clang/lib/Sema/SemaCast.cpp b/clang/lib/Sema/SemaCast.cpp
index a60bc06874..d045870b58 100644
--- a/clang/lib/Sema/SemaCast.cpp
+++ b/clang/lib/Sema/SemaCast.cpp
@@ -2785,7 +2785,8 @@ void CastOperation::CheckCXXCStyleCast(bool FunctionalStyle,
     // change splat from vec1 case to splat from scalar
     if (VT && VT->getNumElements() == 1)
       SrcExpr = Self.ImpCastExprToType(SrcExpr.get(), VT->getElementType(),
-				       CK_HLSLVectorTruncation, VK_PRValue, nullptr, CCK);
+                                       CK_HLSLVectorTruncation, VK_PRValue,
+                                       nullptr, CCK);
     Kind = CK_HLSLSplatCast;
     return;
   }

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https://github.com/llvm/llvm-project/pull/118992