ObjcRuntime.h: Add mips64, aarch64, and riscv64 to non-legacy dispatch (#76694)

This PR updates the list of architectures for which libobjc2 has
fast-path objc_msgSend implementations.

Related to: gnustep/libobjc2#261

Author: hmelder

clang/include/clang/Basic/ObjCRuntime.h

@@ -100,16 +100,24 @@ class ObjCRuntime {
   bool isLegacyDispatchDefaultForArch(llvm::Triple::ArchType Arch) {
     // The GNUstep runtime uses a newer dispatch method by default from
     // version 1.6 onwards
-    if (getKind() == GNUstep && getVersion() >= VersionTuple(1, 6)) {
-      if (Arch == llvm::Triple::arm ||
-          Arch == llvm::Triple::x86 ||
-          Arch == llvm::Triple::x86_64)
-        return false;
-    }
-    else if ((getKind() ==  MacOSX) && isNonFragile() &&
-             (getVersion() >= VersionTuple(10, 0)) &&
-             (getVersion() < VersionTuple(10, 6)))
-        return Arch != llvm::Triple::x86_64;
+    if (getKind() == GNUstep) {
+      switch (Arch) {
+      case llvm::Triple::arm:
+      case llvm::Triple::x86:
+      case llvm::Triple::x86_64:
+        return !(getVersion() >= VersionTuple(1, 6));
+      case llvm::Triple::aarch64:
+      case llvm::Triple::mips64:
+        return !(getVersion() >= VersionTuple(1, 9));
+      case llvm::Triple::riscv64:
+        return !(getVersion() >= VersionTuple(2, 2));
+      default:
+        return true;
+      }
+    } else if ((getKind() == MacOSX) && isNonFragile() &&
+               (getVersion() >= VersionTuple(10, 0)) &&
+               (getVersion() < VersionTuple(10, 6)))
+      return Arch != llvm::Triple::x86_64;
     // Except for deployment target of 10.5 or less,
     // Mac runtimes use legacy dispatch everywhere now.
     return true;

clang/test/CodeGenObjC/messages.m

@@ -1,7 +1,8 @@
 // RUN: %clang_cc1 -fobjc-runtime=macosx-fragile-10.5 -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-MAC
 // RUN: %clang_cc1 -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-MAC-NF
 // RUN: %clang_cc1 -fobjc-runtime=gcc -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-GNU
-// RUN: %clang_cc1 -fobjc-runtime=gnustep -emit-llvm -o - %s | FileCheck %s -check-prefix CHECK-GNU-NF
+// RUN: %clang_cc1 -fobjc-runtime=gnustep -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-GNU-NF
+// RUN: %clang_cc1 -fobjc-runtime=gnustep-2.2 -fobjc-dispatch-method=non-legacy -emit-llvm -o - %s | FileCheck %s -check-prefix=CHECK-MAC
 
 typedef struct {
   int x;

clang/test/Driver/gnustep-dispatch-method.m

@@ -0,0 +1,38 @@
+// DEFINE: %{triple} =
+// DEFINE: %{ver} = 1.6
+// DEFINE: %{prefix} = CHECK-MSGSEND
+// DEFINE: %{check} = %clang --target=%{triple} -fobjc-runtime=gnustep-%{ver} -### -c %s 2>&1 | FileCheck -check-prefix=%{prefix} %s
+
+// REDEFINE: %{ver} = 1.6
+// REDEFINE: %{triple} = i386-unknown-freebsd
+// RUN: %{check}
+// REDEFINE: %{triple} = x86_64-unknown-freebsd
+// RUN: %{check}
+// REDEFINE: %{triple} = arm-unknown-freebsd
+// RUN: %{check}
+// REDEFINE: %{prefix} = CHECK-MSGLOOKUP
+// REDEFINE: %{triple} = aarch64-unknown-freebsd
+// RUN: %{check}
+// REDEFINE: %{triple} = mips64-unknown-freebsd
+// RUN: %{check}
+// REDEFINE: %{triple} = riscv64-unknown-freebsd
+// RUN: %{check}
+
+// REDEFINE: %{ver} = 1.9
+// REDEFINE: %{prefix} = CHECK-MSGSEND
+// REDEFINE: %{triple} = aarch64-unknown-freebsd
+// RUN: %{check}
+// REDEFINE: %{triple} = mips64-unknown-freebsd
+// RUN: %{check}
+// REDEFINE: %{prefix} = CHECK-MSGLOOKUP
+// REDEFINE: %{triple} = riscv64-unknown-freebsd
+// RUN: %{check}
+
+// REDEFINE: %{ver} = 2.2
+// REDEFINE: %{prefix} = CHECK-MSGSEND
+// REDEFINE: %{triple} = riscv64-unknown-freebsd
+// RUN: %{check}
+
+
+// CHECK-MSGSEND: "-cc1"{{.*}} "-fobjc-dispatch-method=non-legacy"
+// CHECK-MSGLOOKUP-NOT: "-cc1"{{.*}} "-fobjc-dispatch-method=non-legacy"