diff --git a/clang/include/clang/AST/ASTContext.h b/clang/include/clang/AST/ASTContext.h
index 2b9cd035623cc..d374ec6e72a71 100644
--- a/clang/include/clang/AST/ASTContext.h
+++ b/clang/include/clang/AST/ASTContext.h
@@ -2914,10 +2914,14 @@ class ASTContext : public RefCountedBase<ASTContext> {
   NestedNameSpecifier *
   getCanonicalNestedNameSpecifier(NestedNameSpecifier *NNS) const;
 
-  /// Retrieves the default calling convention for the current target.
+  /// Retrieves the default calling convention for the current context.
+  ///
+  /// The context's default calling convention may differ from the current
+  /// target's default calling convention if the -fdefault-calling-conv option
+  /// is used; to get the target's default calling convention, e.g. for built-in
+  /// functions, call getTargetInfo().getDefaultCallingConv() instead.
   CallingConv getDefaultCallingConvention(bool IsVariadic,
-                                          bool IsCXXMethod,
-                                          bool IsBuiltin = false) const;
+                                          bool IsCXXMethod) const;
 
   /// Retrieves the "canonical" template name that refers to a
   /// given template.
diff --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index e7abb18330e17..aa55018ddd249 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -12677,10 +12677,9 @@ QualType ASTContext::GetBuiltinType(unsigned Id,
 
   bool Variadic = (TypeStr[0] == '.');
 
-  FunctionType::ExtInfo EI(getDefaultCallingConvention(
-      Variadic, /*IsCXXMethod=*/false, /*IsBuiltin=*/true));
-  if (BuiltinInfo.isNoReturn(Id)) EI = EI.withNoReturn(true);
-
+  FunctionType::ExtInfo EI(Target->getDefaultCallingConv());
+  if (BuiltinInfo.isNoReturn(Id))
+    EI = EI.withNoReturn(true);
 
   // We really shouldn't be making a no-proto type here.
   if (ArgTypes.empty() && Variadic && !getLangOpts().requiresStrictPrototypes())
@@ -13064,43 +13063,38 @@ void ASTContext::forEachMultiversionedFunctionVersion(
 }
 
 CallingConv ASTContext::getDefaultCallingConvention(bool IsVariadic,
-                                                    bool IsCXXMethod,
-                                                    bool IsBuiltin) const {
+                                                    bool IsCXXMethod) const {
   // Pass through to the C++ ABI object
   if (IsCXXMethod)
     return ABI->getDefaultMethodCallConv(IsVariadic);
 
-  // Builtins ignore user-specified default calling convention and remain the
-  // Target's default calling convention.
-  if (!IsBuiltin) {
-    switch (LangOpts.getDefaultCallingConv()) {
-    case LangOptions::DCC_None:
-      break;
-    case LangOptions::DCC_CDecl:
-      return CC_C;
-    case LangOptions::DCC_FastCall:
-      if (getTargetInfo().hasFeature("sse2") && !IsVariadic)
-        return CC_X86FastCall;
-      break;
-    case LangOptions::DCC_StdCall:
-      if (!IsVariadic)
-        return CC_X86StdCall;
-      break;
-    case LangOptions::DCC_VectorCall:
-      // __vectorcall cannot be applied to variadic functions.
-      if (!IsVariadic)
-        return CC_X86VectorCall;
-      break;
-    case LangOptions::DCC_RegCall:
-      // __regcall cannot be applied to variadic functions.
-      if (!IsVariadic)
-        return CC_X86RegCall;
-      break;
-    case LangOptions::DCC_RtdCall:
-      if (!IsVariadic)
-        return CC_M68kRTD;
-      break;
-    }
+  switch (LangOpts.getDefaultCallingConv()) {
+  case LangOptions::DCC_None:
+    break;
+  case LangOptions::DCC_CDecl:
+    return CC_C;
+  case LangOptions::DCC_FastCall:
+    if (getTargetInfo().hasFeature("sse2") && !IsVariadic)
+      return CC_X86FastCall;
+    break;
+  case LangOptions::DCC_StdCall:
+    if (!IsVariadic)
+      return CC_X86StdCall;
+    break;
+  case LangOptions::DCC_VectorCall:
+    // __vectorcall cannot be applied to variadic functions.
+    if (!IsVariadic)
+      return CC_X86VectorCall;
+    break;
+  case LangOptions::DCC_RegCall:
+    // __regcall cannot be applied to variadic functions.
+    if (!IsVariadic)
+      return CC_X86RegCall;
+    break;
+  case LangOptions::DCC_RtdCall:
+    if (!IsVariadic)
+      return CC_M68kRTD;
+    break;
   }
   return Target->getDefaultCallingConv();
 }
diff --git a/clang/lib/Sema/SemaExprCXX.cpp b/clang/lib/Sema/SemaExprCXX.cpp
index 4a86cbd0633b6..cfdf855f65ff1 100644
--- a/clang/lib/Sema/SemaExprCXX.cpp
+++ b/clang/lib/Sema/SemaExprCXX.cpp
@@ -3467,8 +3467,8 @@ void Sema::DeclareGlobalAllocationFunction(DeclarationName Name,
     }
   }
 
-  FunctionProtoType::ExtProtoInfo EPI(Context.getDefaultCallingConvention(
-      /*IsVariadic=*/false, /*IsCXXMethod=*/false, /*IsBuiltin=*/true));
+  FunctionProtoType::ExtProtoInfo EPI(
+      Context.getTargetInfo().getDefaultCallingConv());
 
   QualType BadAllocType;
   bool HasBadAllocExceptionSpec = Name.isAnyOperatorNew();
diff --git a/clang/lib/Sema/SemaLookup.cpp b/clang/lib/Sema/SemaLookup.cpp
index aa7191d2814fe..6d6e07a2c03c7 100644
--- a/clang/lib/Sema/SemaLookup.cpp
+++ b/clang/lib/Sema/SemaLookup.cpp
@@ -22,6 +22,7 @@
 #include "clang/AST/ExprCXX.h"
 #include "clang/Basic/Builtins.h"
 #include "clang/Basic/LangOptions.h"
+#include "clang/Basic/TargetInfo.h"
 #include "clang/Lex/HeaderSearch.h"
 #include "clang/Lex/ModuleLoader.h"
 #include "clang/Lex/Preprocessor.h"
@@ -777,7 +778,7 @@ static void GetOpenCLBuiltinFctOverloads(
     std::vector<QualType> &FunctionList, SmallVector<QualType, 1> &RetTypes,
     SmallVector<SmallVector<QualType, 1>, 5> &ArgTypes) {
   FunctionProtoType::ExtProtoInfo PI(
-      Context.getDefaultCallingConvention(false, false, true));
+      Context.getTargetInfo().getDefaultCallingConv());
   PI.Variadic = false;
 
   // Do not attempt to create any FunctionTypes if there are no return types,
diff --git a/clang/lib/Sema/SemaRISCV.cpp b/clang/lib/Sema/SemaRISCV.cpp
index 9eab0c2a0df6a..c8b925156ed0b 100644
--- a/clang/lib/Sema/SemaRISCV.cpp
+++ b/clang/lib/Sema/SemaRISCV.cpp
@@ -417,7 +417,7 @@ void RISCVIntrinsicManagerImpl::CreateRVVIntrinsicDecl(LookupResult &LR,
     ArgTypes.push_back(RVVType2Qual(Context, Sigs[i]));
 
   FunctionProtoType::ExtProtoInfo PI(
-      Context.getDefaultCallingConvention(false, false, true));
+      Context.getTargetInfo().getDefaultCallingConv());
 
   PI.Variadic = false;