[Builtin] Make __builtin_thread_pointer target-independent.

This is now supported for ARM, AArch64, PowerPC, SystemZ, SPARC, Mips.

Differential Revision: http://reviews.llvm.org/D19589

llvm-svn: 272893

Author: Marcin Koscielnicki

clang/include/clang/Basic/Builtins.def

@@ -467,6 +467,7 @@ BUILTIN(__builtin_eh_return_data_regno, "iIi", "nc")
 BUILTIN(__builtin_snprintf, "ic*zcC*.", "nFp:2:")
 BUILTIN(__builtin_vsprintf, "ic*cC*a", "nFP:1:")
 BUILTIN(__builtin_vsnprintf, "ic*zcC*a", "nFP:2:")
+BUILTIN(__builtin_thread_pointer, "v*", "nc")
 
 // GCC exception builtins
 BUILTIN(__builtin_eh_return, "vzv*", "r") // FIXME: Takes intptr_t, not size_t!

clang/include/clang/Basic/BuiltinsAArch64.def

@@ -60,6 +60,5 @@ 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*", "nc")
 
 #undef BUILTIN

clang/include/clang/Basic/BuiltinsARM.def

@@ -20,7 +20,6 @@
 
 // In libgcc
 BUILTIN(__clear_cache, "vv*v*", "i")
-BUILTIN(__builtin_thread_pointer, "v*", "")
 
 // Saturating arithmetic
 BUILTIN(__builtin_arm_qadd, "iii", "nc")

clang/lib/CodeGen/CGBuiltin.cpp

@@ -2158,6 +2158,13 @@ RValue CodeGenFunction::EmitBuiltinExpr(const FunctionDecl *FD,
   case Builtin::BI__builtin_canonicalizef:
   case Builtin::BI__builtin_canonicalizel:
     return RValue::get(emitUnaryBuiltin(*this, E, Intrinsic::canonicalize));
+
+  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 GCCBuiltin.
+    break;
+  }
   }
 
   // If this is an alias for a lib function (e.g. __builtin_sin), emit

clang/test/CodeGen/builtins-arm64.c

@@ -1,4 +1,4 @@
-// RUN: %clang_cc1 -triple arm64-apple-ios -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
+// RUN: %clang_cc1 -triple arm64-unknown-linux -emit-llvm -o - %s | opt -S -mem2reg | FileCheck %s
 
 void f0(void *a, void *b) {
 	__clear_cache(a,b);