[clang] [llvm] [RISCV][VLS] Support RISCV VLS calling convention (PR #100346)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. 
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<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff d36edf8146cfea9f0407e2fb26283297eb6a6ac4 
dc4d11d0e9665f42b27de4bfb73c9756b007518d --extensions cpp,h,c -- 
clang/include/clang-c/Index.h clang/include/clang/AST/Type.h 
clang/include/clang/Basic/Specifiers.h 
clang/include/clang/CodeGen/CGFunctionInfo.h clang/lib/AST/ASTContext.cpp 
clang/lib/AST/ItaniumMangle.cpp clang/lib/AST/Type.cpp 
clang/lib/AST/TypePrinter.cpp clang/lib/Basic/Targets/RISCV.cpp 
clang/lib/CodeGen/CGCall.cpp clang/lib/CodeGen/CGDebugInfo.cpp 
clang/lib/CodeGen/Targets/RISCV.cpp clang/lib/Driver/ToolChains/Arch/RISCV.cpp 
clang/lib/Sema/SemaDeclAttr.cpp clang/lib/Sema/SemaType.cpp 
clang/test/CodeGen/RISCV/riscv-vector-callingconv-llvm-ir.c 
clang/test/CodeGen/RISCV/riscv-vector-callingconv-llvm-ir.cpp 
clang/test/CodeGen/RISCV/riscv-vector-callingconv.c 
clang/test/CodeGen/RISCV/riscv-vector-callingconv.cpp 
clang/tools/libclang/CXType.cpp llvm/include/llvm/AsmParser/LLToken.h 
llvm/include/llvm/IR/CallingConv.h llvm/lib/AsmParser/LLLexer.cpp 
llvm/lib/AsmParser/LLParser.cpp llvm/lib/IR/AsmWriter.cpp 
llvm/lib/Target/RISCV/RISCVISelLowering.cpp 
llvm/lib/Target/RISCV/RISCVSubtarget.h
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
index 7e2ffb09e3..ea861fa9dd 100644
--- a/clang/lib/AST/Type.cpp
+++ b/clang/lib/AST/Type.cpp
@@ -3510,7 +3510,8 @@ StringRef FunctionType::getNameForCallConv(CallingConv 
CC) {
     // clang-format off
   case CC_RISCVVectorCall: return "riscv_vector_cc";
     // clang-format on
-  case CC_RISCVVLSCall: return "riscv_vls_cc";
+  case CC_RISCVVLSCall:
+    return "riscv_vls_cc";
   }
 
   llvm_unreachable("Invalid calling convention.");
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index e6e05ee92a..c4785676d2 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -77,7 +77,8 @@ unsigned 
CodeGenTypes::ClangCallConvToLLVMCallConv(CallingConv CC) {
     // clang-format off
   case CC_RISCVVectorCall: return llvm::CallingConv::RISCV_VectorCall;
     // clang-format on
-  case CC_RISCVVLSCall: return llvm::CallingConv::RISCV_VLSCall;
+  case CC_RISCVVLSCall:
+    return llvm::CallingConv::RISCV_VLSCall;
   }
 }
 
diff --git a/clang/lib/CodeGen/Targets/RISCV.cpp 
b/clang/lib/CodeGen/Targets/RISCV.cpp
index 4d16eaad78..f90eb0a11b 100644
--- a/clang/lib/CodeGen/Targets/RISCV.cpp
+++ b/clang/lib/CodeGen/Targets/RISCV.cpp
@@ -105,8 +105,8 @@ void RISCVABIInfo::computeInfo(CGFunctionInfo &FI) const {
   int ArgNum = 0;
   for (auto &ArgInfo : FI.arguments()) {
     bool IsFixed = ArgNum < NumFixedArgs;
-    ArgInfo.info =
-        classifyArgumentType(ArgInfo.type, IsFixed, ArgGPRsLeft, ArgFPRsLeft, 
ABIVLen);
+    ArgInfo.info = classifyArgumentType(ArgInfo.type, IsFixed, ArgGPRsLeft,
+                                        ArgFPRsLeft, ABIVLen);
     ArgNum++;
   }
 }
@@ -335,7 +335,8 @@ ABIArgInfo RISCVABIInfo::coerceVLSVector(QualType Ty, 
unsigned ABIVLen) const {
 
   unsigned NumElts = VT->getNumElements();
   llvm::ScalableVectorType *ResType;
-  llvm::Type *EltType = CGT.ConvertType(VT->getElementType());;
+  llvm::Type *EltType = CGT.ConvertType(VT->getElementType());
+  ;
 
   if (ABIVLen == 0) {
     // RVV fixed-length vector
@@ -498,7 +499,8 @@ ABIArgInfo RISCVABIInfo::classifyArgumentType(QualType Ty, 
bool IsFixed,
   return getNaturalAlignIndirect(Ty, /*ByVal=*/false);
 }
 
-ABIArgInfo RISCVABIInfo::classifyReturnType(QualType RetTy, unsigned ABIVLen) 
const {
+ABIArgInfo RISCVABIInfo::classifyReturnType(QualType RetTy,
+                                            unsigned ABIVLen) const {
   if (RetTy->isVoidType())
     return ABIArgInfo::getIgnore();
 
@@ -507,8 +509,8 @@ ABIArgInfo RISCVABIInfo::classifyReturnType(QualType RetTy, 
unsigned ABIVLen) co
 
   // The rules for return and argument types are the same, so defer to
   // classifyArgumentType.
-  return classifyArgumentType(RetTy, /*IsFixed=*/true, ArgGPRsLeft,
-                              ArgFPRsLeft, ABIVLen);
+  return classifyArgumentType(RetTy, /*IsFixed=*/true, ArgGPRsLeft, 
ArgFPRsLeft,
+                              ABIVLen);
 }
 
 RValue RISCVABIInfo::EmitVAArg(CodeGenFunction &CGF, Address VAListAddr,
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
index 895569e896..01660eb37f 100644
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -7482,7 +7482,7 @@ static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr 
&Attr) {
   case ParsedAttr::AT_RISCVVectorCC:
     return createSimpleAttr<RISCVVectorCCAttr>(Ctx, Attr);
   case ParsedAttr::AT_RISCVVLSCC:
-    return ::new (Ctx) RISCVVLSCCAttr(Ctx, Attr, /*dummy*/0);
+    return ::new (Ctx) RISCVVLSCCAttr(Ctx, Attr, /*dummy*/ 0);
   }
   llvm_unreachable("unexpected attribute kind!");
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/100346
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