4 files changed, 14 insertions, 4 deletions
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index b7e8bad..f39c698 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -222,6 +222,8 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
       return std::make_unique<OHOSTargetInfo<ARMleTargetInfo>>(Triple, Opts);
     case llvm::Triple::FreeBSD:
       return std::make_unique<FreeBSDTargetInfo<ARMleTargetInfo>>(Triple, Opts);
+    case llvm::Triple::Fuchsia:
+      return std::make_unique<FuchsiaTargetInfo<ARMleTargetInfo>>(Triple, Opts);
     case llvm::Triple::NetBSD:
       return std::make_unique<NetBSDTargetInfo<ARMleTargetInfo>>(Triple, Opts);
     case llvm::Triple::OpenBSD:
@@ -254,6 +256,8 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
       return std::make_unique<AppleMachOARMTargetInfo>(Triple, Opts);
 
     switch (os) {
+    case llvm::Triple::Fuchsia:
+      return std::make_unique<FuchsiaTargetInfo<ARMbeTargetInfo>>(Triple, Opts);
     case llvm::Triple::Linux:
       return std::make_unique<LinuxTargetInfo<ARMbeTargetInfo>>(Triple, Opts);
     case llvm::Triple::NetBSD:
diff --git a/clang/lib/Basic/Targets/ARM.cpp b/clang/lib/Basic/Targets/ARM.cpp
index 3de17d2..d00a3a4 100644
--- a/clang/lib/Basic/Targets/ARM.cpp
+++ b/clang/lib/Basic/Targets/ARM.cpp
@@ -260,6 +260,7 @@ ARMTargetInfo::ARMTargetInfo(const llvm::Triple &Triple,
     : TargetInfo(Triple), FPMath(FP_Default), IsAAPCS(true), LDREX(0),
       HW_FP(0) {
   bool IsFreeBSD = Triple.isOSFreeBSD();
+  bool IsFuchsia = Triple.isOSFuchsia();
   bool IsOpenBSD = Triple.isOSOpenBSD();
   bool IsNetBSD = Triple.isOSNetBSD();
   bool IsHaiku = Triple.isOSHaiku();
@@ -332,7 +333,7 @@ ARMTargetInfo::ARMTargetInfo(const llvm::Triple &Triple,
     default:
       if (IsNetBSD)
         setABI("apcs-gnu");
-      else if (IsFreeBSD || IsOpenBSD || IsHaiku || IsOHOS)
+      else if (IsFreeBSD || IsFuchsia || IsOpenBSD || IsHaiku || IsOHOS)
         setABI("aapcs-linux");
       else
         setABI("aapcs");
diff --git a/clang/lib/Basic/Targets/RISCV.cpp b/clang/lib/Basic/Targets/RISCV.cpp
index 04da4e6..685925b 100644
--- a/clang/lib/Basic/Targets/RISCV.cpp
+++ b/clang/lib/Basic/Targets/RISCV.cpp
@@ -192,8 +192,11 @@ void RISCVTargetInfo::getTargetDefines(const LangOptions &Opts,
     Builder.defineMacro("__riscv_muldiv");
   }
 
-  if (ISAInfo->hasExtension("a")) {
+  // The "a" extension is composed of "zalrsc" and "zaamo"
+  if (ISAInfo->hasExtension("a"))
     Builder.defineMacro("__riscv_atomic");
+
+  if (ISAInfo->hasExtension("zalrsc")) {
     Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
     Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
     Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
diff --git a/clang/lib/Basic/Targets/RISCV.h b/clang/lib/Basic/Targets/RISCV.h
index d8b0e64..85fa4cc 100644
--- a/clang/lib/Basic/Targets/RISCV.h
+++ b/clang/lib/Basic/Targets/RISCV.h
@@ -195,7 +195,8 @@ public:
   void setMaxAtomicWidth() override {
     MaxAtomicPromoteWidth = 128;
 
-    if (ISAInfo->hasExtension("a"))
+    // "a" implies "zalrsc" which is sufficient to inline atomics
+    if (ISAInfo->hasExtension("zalrsc"))
       MaxAtomicInlineWidth = 32;
   }
 };
@@ -225,7 +226,8 @@ public:
   void setMaxAtomicWidth() override {
     MaxAtomicPromoteWidth = 128;
 
-    if (ISAInfo->hasExtension("a"))
+    // "a" implies "zalrsc" which is sufficient to inline atomics
+    if (ISAInfo->hasExtension("zalrsc"))
       MaxAtomicInlineWidth = 64;
   }
 };