[AArch64] Implement __builtin_thread_pointer

[zatrazz]

Summary

This path add the aarch64 __builtin_thread_pointer support. It will be
lowered to llvm.aarch64.thread.pointer.

[rengolin]

include/clang/Basic/BuiltinsAArch64.def

63

Isn't this nothrow, at least?

[zatrazz]

include/clang/Basic/BuiltinsAArch64.def

63

It is, I will change it.

[rengolin]

Ok, LGTM with the change. Thanks!

include/clang/Basic/BuiltinsAArch64.def

 
 // System Registers
 BUILTIN(__builtin_arm_rsr, "UicC*", "nc")
 BUILTIN(__builtin_arm_rsr64, "LUicC*", "nc")
 BUILTIN(__builtin_arm_rsrp, "v*cC*", "nc")
 BUILTIN(__builtin_arm_wsr, "vcC*Ui", "nc")
 BUILTIN(__builtin_arm_wsr64, "vcC*LUi", "nc")
 BUILTIN(__builtin_arm_wsrp, "vcC*vC*", "nc")
+BUILTIN(__builtin_thread_pointer, "v*", "")
 
 #undef BUILTIN

lib/CodeGen/CGBuiltin.cpp

if (BuiltinID == AArch64::BI__builtin_arm_strex ||
     return Builder.CreateCall(F, {StoreVal, StoreAddr}, "stxr");
   }
 
   if (BuiltinID == AArch64::BI__builtin_arm_clrex) {
     Function *F = CGM.getIntrinsic(Intrinsic::aarch64_clrex);
     return Builder.CreateCall(F);
   }
 
+  if (BuiltinID == AArch64::BI__builtin_thread_pointer) {
+    Function *F = CGM.getIntrinsic(Intrinsic::aarch64_thread_pointer);
+    return Builder.CreateCall(F);
+  }
+
   // CRC32
   Intrinsic::ID CRCIntrinsicID = Intrinsic::not_intrinsic;
   switch (BuiltinID) {
   case AArch64::BI__builtin_arm_crc32b:
     CRCIntrinsicID = Intrinsic::aarch64_crc32b; break;
   case AArch64::BI__builtin_arm_crc32cb:
     CRCIntrinsicID = Intrinsic::aarch64_crc32cb; break;
   case AArch64::BI__builtin_arm_crc32h:

test/CodeGen/builtins-arm64.c

 // RUN: %clang_cc1 -triple arm64-apple-ios -O3 -emit-llvm -o - %s | FileCheck %s
 
 void f0(void *a, void *b) {
   __clear_cache(a,b);
 // CHECK: call {{.*}} @__clear_cache
 }
 
+void *tp (void) {
+  return __builtin_thread_pointer ();
+// CHECK: call {{.*}} @llvm.aarch64.thread.pointer()
+}
+
 // CHECK: call {{.*}} @llvm.aarch64.rbit.i32(i32 %a)
 unsigned rbit(unsigned a) {
   return __builtin_arm_rbit(a);
 }
 
 // CHECK: call {{.*}} @llvm.aarch64.rbit.i64(i64 %a)
 unsigned long long rbit64(unsigned long long a) {
   return __builtin_arm_rbit64(a);