[RISCV] RISCV vector calling convention (1/2)

4vtomat · 4vtomat · commit 08371002a08d · 2024-03-27T07:51:22.000-07:00
This is the vector calling convention based on https://github.com/riscv-non-isa/riscv-elf-psabi-doc, the idea is to split between "scalar" callee-saved registers and "vector" callee-saved registers. "scalar" ones remain the original strategy, however, "vector" ones are handled together with RVV objects. The stack layout would be: |--------------------------| <-- FP | callee-allocated save | | area for register varargs| |--------------------------| | callee-saved registers | <-- scalar callee-saved | (scalar) | |--------------------------| | RVV alignment padding | |--------------------------| | callee-saved registers | <-- vector callee-saved | (vector) | |--------------------------| | RVV objects | |--------------------------| | padding before RVV | |--------------------------| | scalar local variables | |--------------------------| <-- BP | variable size objects | |--------------------------| <-- SP Note: This patch doesn't contain "tuple" type, e.g. vint32m1x2. It will be handled in https://github.com/riscv-non-isa/riscv-elf-psabi-doc (2/2). Differential Revision: https://reviews.llvm.org/D154576
diff --git a/clang/include/clang-c/Index.h b/clang/include/clang-c/Index.h
@@ -2991,6 +2991,7 @@ enum CXCallingConv {
   CXCallingConv_AArch64SVEPCS = 18,
   CXCallingConv_M68kRTD = 19,
   CXCallingConv_PreserveNone = 20,
+  CXCallingConv_RISCVVectorCall = 21,
 
   CXCallingConv_Invalid = 100,
   CXCallingConv_Unexposed = 200
diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td
@@ -3011,6 +3011,13 @@ def PreserveNone : DeclOrTypeAttr, TargetSpecificAttr<TargetAnyX86> {
   let Documentation = [PreserveNoneDocs];
 }
 
+def RISCVVectorCC: DeclOrTypeAttr, TargetSpecificAttr<TargetRISCV> {
+ let Spellings = [CXX11<"riscv", "vector_cc">,
+                  C23<"riscv", "vector_cc">,
+                  Clang<"riscv_vector_cc">];
+ let Documentation = [RISCVVectorCCDocs];
+}
+
 def Target : InheritableAttr {
   let Spellings = [GCC<"target">];
   let Args = [StringArgument<"featuresStr">];
diff --git a/clang/include/clang/Basic/AttrDocs.td b/clang/include/clang/Basic/AttrDocs.td
@@ -5494,6 +5494,17 @@ for clang builtin functions.
   }];
 }
 
+def RISCVVectorCCDocs : Documentation {
+ let Category = DocCatCallingConvs;
+ let Heading = "riscv::vector_cc, riscv_vector_cc, clang::riscv_vector_cc";
+ let Content = [{
+The ``riscv_vector_cc`` attribute can be applied to a function. It preserves 15
+registers namely, v1-v7 and v24-v31 as callee-saved. Callers thus don't need
+to save these registers before function calls, and callees only need to save
+them if they use them.
+ }];
+}
+
 def PreferredNameDocs : Documentation {
   let Category = DocCatDecl;
   let Content = [{
diff --git a/clang/include/clang/Basic/Specifiers.h b/clang/include/clang/Basic/Specifiers.h
@@ -273,29 +273,30 @@ namespace clang {
 
   /// CallingConv - Specifies the calling convention that a function uses.
   enum CallingConv {
-    CC_C,           // __attribute__((cdecl))
-    CC_X86StdCall,  // __attribute__((stdcall))
-    CC_X86FastCall, // __attribute__((fastcall))
-    CC_X86ThisCall, // __attribute__((thiscall))
-    CC_X86VectorCall, // __attribute__((vectorcall))
-    CC_X86Pascal,   // __attribute__((pascal))
-    CC_Win64,       // __attribute__((ms_abi))
-    CC_X86_64SysV,  // __attribute__((sysv_abi))
-    CC_X86RegCall, // __attribute__((regcall))
-    CC_AAPCS,       // __attribute__((pcs("aapcs")))
-    CC_AAPCS_VFP,   // __attribute__((pcs("aapcs-vfp")))
-    CC_IntelOclBicc, // __attribute__((intel_ocl_bicc))
-    CC_SpirFunction, // default for OpenCL functions on SPIR target
-    CC_OpenCLKernel, // inferred for OpenCL kernels
-    CC_Swift,        // __attribute__((swiftcall))
+    CC_C,                 // __attribute__((cdecl))
+    CC_X86StdCall,        // __attribute__((stdcall))
+    CC_X86FastCall,       // __attribute__((fastcall))
+    CC_X86ThisCall,       // __attribute__((thiscall))
+    CC_X86VectorCall,     // __attribute__((vectorcall))
+    CC_X86Pascal,         // __attribute__((pascal))
+    CC_Win64,             // __attribute__((ms_abi))
+    CC_X86_64SysV,        // __attribute__((sysv_abi))
+    CC_X86RegCall,        // __attribute__((regcall))
+    CC_AAPCS,             // __attribute__((pcs("aapcs")))
+    CC_AAPCS_VFP,         // __attribute__((pcs("aapcs-vfp")))
+    CC_IntelOclBicc,      // __attribute__((intel_ocl_bicc))
+    CC_SpirFunction,      // default for OpenCL functions on SPIR target
+    CC_OpenCLKernel,      // inferred for OpenCL kernels
+    CC_Swift,             // __attribute__((swiftcall))
     CC_SwiftAsync,        // __attribute__((swiftasynccall))
-    CC_PreserveMost, // __attribute__((preserve_most))
-    CC_PreserveAll,  // __attribute__((preserve_all))
+    CC_PreserveMost,      // __attribute__((preserve_most))
+    CC_PreserveAll,       // __attribute__((preserve_all))
     CC_AArch64VectorCall, // __attribute__((aarch64_vector_pcs))
-    CC_AArch64SVEPCS, // __attribute__((aarch64_sve_pcs))
-    CC_AMDGPUKernelCall, // __attribute__((amdgpu_kernel))
-    CC_M68kRTD,       // __attribute__((m68k_rtd))
-    CC_PreserveNone,  // __attribute__((preserve_none))
+    CC_AArch64SVEPCS,     // __attribute__((aarch64_sve_pcs))
+    CC_AMDGPUKernelCall,  // __attribute__((amdgpu_kernel))
+    CC_M68kRTD,           // __attribute__((m68k_rtd))
+    CC_PreserveNone,      // __attribute__((preserve_none))
+    CC_RISCVVectorCall,   // __attribute__((riscv_vector_cc))
   };
 
   /// Checks whether the given calling convention supports variadic
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
@@ -3445,6 +3445,7 @@ StringRef CXXNameMangler::getCallingConvQualifierName(CallingConv CC) {
   case CC_PreserveAll:
   case CC_M68kRTD:
   case CC_PreserveNone:
+  case CC_RISCVVectorCall:
     // FIXME: we should be mangling all of the above.
     return "";
 
diff --git a/clang/lib/AST/Type.cpp b/clang/lib/AST/Type.cpp
@@ -3484,6 +3484,9 @@ StringRef FunctionType::getNameForCallConv(CallingConv CC) {
   case CC_PreserveAll: return "preserve_all";
   case CC_M68kRTD: return "m68k_rtd";
   case CC_PreserveNone: return "preserve_none";
+    // clang-format off
+  case CC_RISCVVectorCall: return "riscv_vector_cc";
+    // clang-format on
   }
 
   llvm_unreachable("Invalid calling convention.");
@@ -4074,6 +4077,7 @@ bool AttributedType::isCallingConv() const {
   case attr::PreserveAll:
   case attr::M68kRTD:
   case attr::PreserveNone:
+  case attr::RISCVVectorCC:
     return true;
   }
   llvm_unreachable("invalid attr kind");
diff --git a/clang/lib/AST/TypePrinter.cpp b/clang/lib/AST/TypePrinter.cpp
@@ -1071,6 +1071,9 @@ void TypePrinter::printFunctionAfter(const FunctionType::ExtInfo &Info,
     case CC_PreserveNone:
       OS << " __attribute__((preserve_none))";
       break;
+    case CC_RISCVVectorCall:
+      OS << "__attribute__((riscv_vector_cc))";
+      break;
     }
   }
 
@@ -1960,6 +1963,9 @@ void TypePrinter::printAttributedAfter(const AttributedType *T,
   case attr::PreserveNone:
     OS << "preserve_none";
     break;
+  case attr::RISCVVectorCC:
+    OS << "riscv_vector_cc";
+    break;
   case attr::NoDeref:
     OS << "noderef";
     break;
diff --git a/clang/lib/Basic/Targets/RISCV.cpp b/clang/lib/Basic/Targets/RISCV.cpp
@@ -467,3 +467,14 @@ ParsedTargetAttr RISCVTargetInfo::parseTargetAttr(StringRef Features) const {
   }
   return Ret;
 }
+
+TargetInfo::CallingConvCheckResult
+RISCVTargetInfo::checkCallingConvention(CallingConv CC) const {
+  switch (CC) {
+  default:
+    return CCCR_Warning;
+  case CC_C:
+  case CC_RISCVVectorCall:
+    return CCCR_OK;
+  }
+}
diff --git a/clang/lib/Basic/Targets/RISCV.h b/clang/lib/Basic/Targets/RISCV.h
@@ -110,6 +110,8 @@ class RISCVTargetInfo : public TargetInfo {
 
   bool hasBFloat16Type() const override { return true; }
 
+  CallingConvCheckResult checkCallingConvention(CallingConv CC) const override;
+
   bool useFP16ConversionIntrinsics() const override {
     return false;
   }
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
@@ -74,6 +74,9 @@ unsigned CodeGenTypes::ClangCallConvToLLVMCallConv(CallingConv CC) {
   case CC_SwiftAsync: return llvm::CallingConv::SwiftTail;
   case CC_M68kRTD: return llvm::CallingConv::M68k_RTD;
   case CC_PreserveNone: return llvm::CallingConv::PreserveNone;
+    // clang-format off
+  case CC_RISCVVectorCall: return llvm::CallingConv::RISCV_VectorCall;
+    // clang-format on
   }
 }
 
@@ -260,6 +263,9 @@ static CallingConv getCallingConventionForDecl(const ObjCMethodDecl *D,
   if (D->hasAttr<PreserveNoneAttr>())
     return CC_PreserveNone;
 
+  if (D->hasAttr<RISCVVectorCCAttr>())
+    return CC_RISCVVectorCall;
+
   return CC_C;
 }
 
diff --git a/clang/lib/CodeGen/CGDebugInfo.cpp b/clang/lib/CodeGen/CGDebugInfo.cpp
@@ -1452,6 +1452,8 @@ static unsigned getDwarfCC(CallingConv CC) {
     return llvm::dwarf::DW_CC_LLVM_M68kRTD;
   case CC_PreserveNone:
     return llvm::dwarf::DW_CC_LLVM_PreserveNone;
+  case CC_RISCVVectorCall:
+    return llvm::dwarf::DW_CC_LLVM_RISCVVectorCall;
   }
   return 0;
 }
diff --git a/clang/lib/Sema/SemaDeclAttr.cpp b/clang/lib/Sema/SemaDeclAttr.cpp
@@ -5271,6 +5271,9 @@ static void handleCallConvAttr(Sema &S, Decl *D, const ParsedAttr &AL) {
   case ParsedAttr::AT_PreserveNone:
     D->addAttr(::new (S.Context) PreserveNoneAttr(S.Context, AL));
     return;
+  case ParsedAttr::AT_RISCVVectorCC:
+    D->addAttr(::new (S.Context) RISCVVectorCCAttr(S.Context, AL));
+    return;
   default:
     llvm_unreachable("unexpected attribute kind");
   }
@@ -5475,6 +5478,9 @@ bool Sema::CheckCallingConvAttr(const ParsedAttr &Attrs, CallingConv &CC,
   case ParsedAttr::AT_PreserveNone:
     CC = CC_PreserveNone;
     break;
+  case ParsedAttr::AT_RISCVVectorCC:
+    CC = CC_RISCVVectorCall;
+    break;
   default: llvm_unreachable("unexpected attribute kind");
   }
 
@@ -9637,6 +9643,7 @@ ProcessDeclAttribute(Sema &S, Scope *scope, Decl *D, const ParsedAttr &AL,
   case ParsedAttr::AT_AMDGPUKernelCall:
   case ParsedAttr::AT_M68kRTD:
   case ParsedAttr::AT_PreserveNone:
+  case ParsedAttr::AT_RISCVVectorCC:
     handleCallConvAttr(S, D, AL);
     break;
   case ParsedAttr::AT_Suppress:
diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
@@ -138,7 +138,8 @@ static void diagnoseBadTypeAttribute(Sema &S, const ParsedAttr &attr,
   case ParsedAttr::AT_PreserveMost:                                            \
   case ParsedAttr::AT_PreserveAll:                                             \
   case ParsedAttr::AT_M68kRTD:                                                 \
-  case ParsedAttr::AT_PreserveNone
+  case ParsedAttr::AT_PreserveNone:                                            \
+  case ParsedAttr::AT_RISCVVectorCC
 
 // Function type attributes.
 #define FUNCTION_TYPE_ATTRS_CASELIST                                           \
@@ -7939,6 +7940,8 @@ static Attr *getCCTypeAttr(ASTContext &Ctx, ParsedAttr &Attr) {
     return createSimpleAttr<M68kRTDAttr>(Ctx, Attr);
   case ParsedAttr::AT_PreserveNone:
     return createSimpleAttr<PreserveNoneAttr>(Ctx, Attr);
+  case ParsedAttr::AT_RISCVVectorCC:
+    return createSimpleAttr<RISCVVectorCCAttr>(Ctx, Attr);
   }
   llvm_unreachable("unexpected attribute kind!");
 }
diff --git a/clang/test/CodeGen/RISCV/riscv-vector-callingconv-llvm-ir.c b/clang/test/CodeGen/RISCV/riscv-vector-callingconv-llvm-ir.c
@@ -0,0 +1,34 @@
+// REQUIRES: riscv-registered-target
+// RUN: %clang_cc1 -triple riscv64 -target-feature +v \
+// RUN:   -emit-llvm %s -o - | FileCheck -check-prefix=CHECK-LLVM %s
+// RUN: %clang_cc1 -std=c23 -triple riscv64 -target-feature +v \
+// RUN:   -emit-llvm %s -o - | FileCheck -check-prefix=CHECK-LLVM %s
+
+#include <riscv_vector.h>
+
+// CHECK-LLVM: call riscv_vector_cc <vscale x 2 x i32> @bar
+vint32m1_t __attribute__((riscv_vector_cc)) bar(vint32m1_t input);
+vint32m1_t test_vector_cc_attr(vint32m1_t input, int32_t *base, size_t vl) {
+  vint32m1_t val = __riscv_vle32_v_i32m1(base, vl);
+  vint32m1_t ret = bar(input);
+  __riscv_vse32_v_i32m1(base, val, vl);
+  return ret;
+}
+
+// CHECK-LLVM: call riscv_vector_cc <vscale x 2 x i32> @bar
+[[riscv::vector_cc]] vint32m1_t bar(vint32m1_t input);
+vint32m1_t test_vector_cc_attr2(vint32m1_t input, int32_t *base, size_t vl) {
+  vint32m1_t val = __riscv_vle32_v_i32m1(base, vl);
+  vint32m1_t ret = bar(input);
+  __riscv_vse32_v_i32m1(base, val, vl);
+  return ret;
+}
+
+// CHECK-LLVM: call <vscale x 2 x i32> @baz
+vint32m1_t baz(vint32m1_t input);
+vint32m1_t test_no_vector_cc_attr(vint32m1_t input, int32_t *base, size_t vl) {
+  vint32m1_t val = __riscv_vle32_v_i32m1(base, vl);
+  vint32m1_t ret = baz(input);
+  __riscv_vse32_v_i32m1(base, val, vl);
+  return ret;
+}
diff --git a/clang/test/CodeGen/RISCV/riscv-vector-callingconv-llvm-ir.cpp b/clang/test/CodeGen/RISCV/riscv-vector-callingconv-llvm-ir.cpp
@@ -0,0 +1,32 @@
+// REQUIRES: riscv-registered-target
+// RUN: %clang_cc1 -std=c++11 -triple riscv64 -target-feature +v \
+// RUN:   -emit-llvm %s -o - | FileCheck -check-prefix=CHECK-LLVM %s
+
+#include <riscv_vector.h>
+
+// CHECK-LLVM: call riscv_vector_cc <vscale x 2 x i32> @_Z3baru15__rvv_int32m1_t
+vint32m1_t __attribute__((riscv_vector_cc)) bar(vint32m1_t input);
+vint32m1_t test_vector_cc_attr(vint32m1_t input, int32_t *base, size_t vl) {
+  vint32m1_t val = __riscv_vle32_v_i32m1(base, vl);
+  vint32m1_t ret = bar(input);
+  __riscv_vse32_v_i32m1(base, val, vl);
+  return ret;
+}
+
+// CHECK-LLVM: call riscv_vector_cc <vscale x 2 x i32> @_Z3baru15__rvv_int32m1_t
+[[riscv::vector_cc]] vint32m1_t bar(vint32m1_t input);
+vint32m1_t test_vector_cc_attr2(vint32m1_t input, int32_t *base, size_t vl) {
+  vint32m1_t val = __riscv_vle32_v_i32m1(base, vl);
+  vint32m1_t ret = bar(input);
+  __riscv_vse32_v_i32m1(base, val, vl);
+  return ret;
+}
+
+// CHECK-LLVM: call <vscale x 2 x i32> @_Z3bazu15__rvv_int32m1_t
+vint32m1_t baz(vint32m1_t input);
+vint32m1_t test_no_vector_cc_attr(vint32m1_t input, int32_t *base, size_t vl) {
+  vint32m1_t val = __riscv_vle32_v_i32m1(base, vl);
+  vint32m1_t ret = baz(input);
+  __riscv_vse32_v_i32m1(base, val, vl);
+  return ret;
+}
diff --git a/clang/test/CodeGen/RISCV/riscv-vector-callingconv.c b/clang/test/CodeGen/RISCV/riscv-vector-callingconv.c
@@ -0,0 +1,17 @@
+// RUN: %clang_cc1 %s -std=c23 -triple riscv64 -target-feature +v -verify
+
+__attribute__((riscv_vector_cc)) int var; // expected-warning {{'riscv_vector_cc' only applies to function types; type here is 'int'}}
+
+__attribute__((riscv_vector_cc)) void func();
+__attribute__((riscv_vector_cc(1))) void func_invalid(); // expected-error {{'riscv_vector_cc' attribute takes no arguments}}
+
+void test_no_attribute(int); // expected-note {{previous declaration is here}}
+void __attribute__((riscv_vector_cc)) test_no_attribute(int x) { } // expected-error {{function declared 'riscv_vector_cc' here was previously declared without calling convention}}
+
+[[riscv::vector_cc]] int var2; // expected-warning {{'vector_cc' only applies to function types; type here is 'int'}}
+
+[[riscv::vector_cc]] void func2();
+[[riscv::vector_cc(1)]] void func_invalid2(); // expected-error {{'vector_cc' attribute takes no arguments}}
+
+void test_no_attribute2(int); // expected-note {{previous declaration is here}}
+[[riscv::vector_cc]] void test_no_attribute2(int x) { } // expected-error {{function declared 'riscv_vector_cc' here was previously declared without calling convention}}
diff --git a/clang/test/CodeGen/RISCV/riscv-vector-callingconv.cpp b/clang/test/CodeGen/RISCV/riscv-vector-callingconv.cpp
@@ -0,0 +1,35 @@
+// RUN: %clang_cc1 %s -triple riscv64 -target-feature +v -verify
+
+__attribute__((riscv_vector_cc)) int var; // expected-warning {{'riscv_vector_cc' only applies to function types; type here is 'int'}}
+
+__attribute__((riscv_vector_cc)) void func();
+__attribute__((riscv_vector_cc(1))) void func_invalid(); // expected-error {{'riscv_vector_cc' attribute takes no arguments}}
+
+void test_no_attribute(int); // expected-note {{previous declaration is here}}
+void __attribute__((riscv_vector_cc)) test_no_attribute(int x) { } // expected-error {{function declared 'riscv_vector_cc' here was previously declared without calling convention}}
+
+class test_cc {
+  __attribute__((riscv_vector_cc)) void member_func();
+};
+
+void test_lambda() {
+  __attribute__((riscv_vector_cc)) auto lambda = []() { // expected-warning {{'riscv_vector_cc' only applies to function types; type here is 'auto'}}
+  };
+}
+
+[[riscv::vector_cc]] int var2; // expected-warning {{'vector_cc' only applies to function types; type here is 'int'}}
+
+[[riscv::vector_cc]] void func2();
+[[riscv::vector_cc(1)]] void func_invalid2(); // expected-error {{'vector_cc' attribute takes no arguments}}
+
+void test_no_attribute2(int); // expected-note {{previous declaration is here}}
+[[riscv::vector_cc]] void test_no_attribute2(int x) { } // expected-error {{function declared 'riscv_vector_cc' here was previously declared without calling convention}}
+
+class test_cc2 {
+  [[riscv::vector_cc]] void member_func();
+};
+
+void test_lambda2() {
+  [[riscv::vector_cc]] auto lambda = []() { // expected-warning {{'vector_cc' only applies to function types; type here is 'auto'}}
+  };
+}
diff --git a/clang/tools/libclang/CXType.cpp b/clang/tools/libclang/CXType.cpp
@@ -680,6 +680,7 @@ CXCallingConv clang_getFunctionTypeCallingConv(CXType X) {
       TCALLINGCONV(PreserveAll);
       TCALLINGCONV(M68kRTD);
       TCALLINGCONV(PreserveNone);
+      TCALLINGCONV(RISCVVectorCall);
     case CC_SpirFunction: return CXCallingConv_Unexposed;
     case CC_AMDGPUKernelCall: return CXCallingConv_Unexposed;
     case CC_OpenCLKernel: return CXCallingConv_Unexposed;
diff --git a/llvm/include/llvm/AsmParser/LLToken.h b/llvm/include/llvm/AsmParser/LLToken.h
@@ -181,6 +181,7 @@ enum Kind {
   kw_tailcc,
   kw_m68k_rtdcc,
   kw_graalcc,
+  kw_riscv_vector_cc,
 
   // Attributes:
   kw_attributes,
diff --git a/llvm/include/llvm/BinaryFormat/Dwarf.def b/llvm/include/llvm/BinaryFormat/Dwarf.def
@@ -1040,6 +1040,7 @@ HANDLE_DW_CC(0xca, LLVM_PreserveAll)
 HANDLE_DW_CC(0xcb, LLVM_X86RegCall)
 HANDLE_DW_CC(0xcc, LLVM_M68kRTD)
 HANDLE_DW_CC(0xcd, LLVM_PreserveNone)
+HANDLE_DW_CC(0xce, LLVM_RISCVVectorCall)
 // From GCC source code (include/dwarf2.h): This DW_CC_ value is not currently
 // generated by any toolchain.  It is used internally to GDB to indicate OpenCL
 // C functions that have been compiled with the IBM XL C for OpenCL compiler and
diff --git a/llvm/include/llvm/IR/CallingConv.h b/llvm/include/llvm/IR/CallingConv.h
@@ -264,6 +264,9 @@ namespace CallingConv {
     /// except that the first parameter is mapped to x9.
     ARM64EC_Thunk_Native = 109,
 
+    /// Calling convention used for RISC-V V-extension.
+    RISCV_VectorCall = 110,
+
     /// The highest possible ID. Must be some 2^k - 1.
     MaxID = 1023
   };
diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
diff --git a/llvm/lib/IR/AsmWriter.cpp b/llvm/lib/IR/AsmWriter.cpp
diff --git a/llvm/lib/Target/RISCV/RISCVCallingConv.td b/llvm/lib/Target/RISCV/RISCVCallingConv.td
diff --git a/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp b/llvm/lib/Target/RISCV/RISCVFrameLowering.cpp
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
diff --git a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
diff --git a/llvm/test/CodeGen/RISCV/rvv/callee-saved-regs.ll b/llvm/test/CodeGen/RISCV/rvv/callee-saved-regs.ll

Original file line number	Diff line number	Diff line change
`@@ -110,6 +110,8 @@ class RISCVTargetInfo : public TargetInfo {`
`110`	`110`
`111`	`111`	`bool hasBFloat16Type() const override { return true; }`
`112`	`112`
	`113`	`+ CallingConvCheckResult checkCallingConvention(CallingConv CC) const override;`
	`114`	`+`
`113`	`115`	`bool useFP16ConversionIntrinsics() const override {`
`114`	`116`	`return false;`
`115`	`117`	`}`
Original file line number	Diff line number	Diff line change
`@@ -74,6 +74,9 @@ unsigned CodeGenTypes::ClangCallConvToLLVMCallConv(CallingConv CC) {`
`74`	`74`	`case CC_SwiftAsync: return llvm::CallingConv::SwiftTail;`
`75`	`75`	`case CC_M68kRTD: return llvm::CallingConv::M68k_RTD;`
`76`	`76`	`case CC_PreserveNone: return llvm::CallingConv::PreserveNone;`
	`77`	`+ // clang-format off`
	`78`	`+ case CC_RISCVVectorCall: return llvm::CallingConv::RISCV_VectorCall;`
	`79`	`+ // clang-format on`
`77`	`80`	`}`
`78`	`81`	`}`
`79`	`82`
`@@ -260,6 +263,9 @@ static CallingConv getCallingConventionForDecl(const ObjCMethodDecl *D,`
`260`	`263`	`if (D->hasAttr<PreserveNoneAttr>())`
`261`	`264`	`return CC_PreserveNone;`
`262`	`265`
	`266`	`+ if (D->hasAttr<RISCVVectorCCAttr>())`
	`267`	`+ return CC_RISCVVectorCall;`
	`268`	`+`
`263`	`269`	`return CC_C;`
`264`	`270`	`}`
`265`	`271`