[clang][IR] Overload @llvm.thread.pointer to support non-AS0 targets (#132489)

Thread-local globals live, by default, in the default globals address
space, which may not be 0, so we need to overload @llvm.thread.pointer
to support other address spaces, and use the default globals address
space in Clang.

3 files changed, 5 insertions, 4 deletions

diff --git a/clang/lib/CodeGen/CGBuiltin.cpp b/clang/lib/CodeGen/CGBuiltin.cpp
index 4fdf211..48cfbda 100644
--- a/clang/lib/CodeGen/CGBuiltin.cpp
+++ b/clang/lib/CodeGen/CGBuiltin.cpp
@@ -6115,8 +6115,9 @@ RValue CodeGenFunction::EmitBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
   case Builtin::BI__builtin_thread_pointer: {
     if (!getContext().getTargetInfo().isTLSSupported())
       CGM.ErrorUnsupported(E, "__builtin_thread_pointer");
-    // Fall through - it's already mapped to the intrinsic by ClangBuiltin.
-    break;
+
+    return RValue::get(Builder.CreateIntrinsic(llvm::Intrinsic::thread_pointer,
+                                               {GlobalsInt8PtrTy}, {}));
   }
   case Builtin::BI__builtin_os_log_format:
     return emitBuiltinOSLogFormat(*E);
diff --git a/clang/test/CodeGen/builtins-arm64.c b/clang/test/CodeGen/builtins-arm64.c
index 0913295..86c2812 100644
--- a/clang/test/CodeGen/builtins-arm64.c
+++ b/clang/test/CodeGen/builtins-arm64.c
@@ -10,7 +10,7 @@ void f0(void *a, void *b) {
 
 void *tp (void) {
   return __builtin_thread_pointer ();
-// CHECK-LINUX: call {{.*}} @llvm.thread.pointer()
+// CHECK-LINUX: call {{.*}} @llvm.thread.pointer.p0()
 }
 
 // CHECK: call {{.*}} @llvm.bitreverse.i32(i32 %a)
diff --git a/clang/test/CodeGen/builtins-wasm.c b/clang/test/CodeGen/builtins-wasm.c
index 4a44a9a..d8aff82 100644
--- a/clang/test/CodeGen/builtins-wasm.c
+++ b/clang/test/CodeGen/builtins-wasm.c
@@ -749,5 +749,5 @@ int externref_is_null(__externref_t arg) {
 
 void *tp (void) {
   return __builtin_thread_pointer ();
-  // WEBASSEMBLY: call {{.*}} @llvm.thread.pointer()
+  // WEBASSEMBLY: call {{.*}} @llvm.thread.pointer.p0()
 }