[PATCH/middle-end 2/6] __builtin_thread_pointer and AARCH64 ILP32

[Andrew Pinski <pinskia at gmail dot com>]

Hi,
  With ILP32 AARCH64, Pmode (DImode) != ptrmode (SImode) so the variable decl
has a mode of SImode while the register is DImode.  So the target that gets
passed down to expand_builtin_thread_pointer is NULL as expand does not
know how to get a subreg for a pointer type.

This fixes the problem by handling a NULL target like we are able to handle
for a non register/correct mode target inside expand_builtin_thread_pointer.

OK?  Build and tested for aarch64-elf with no regressions.

Thanks,
Andrew Pinski

	* builtins.c (expand_builtin_thread_pointer): Create a new target
	when the target is NULL.
---
 gcc/ChangeLog  |    5 +++++
 gcc/builtins.c |    2 +-
 2 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/gcc/builtins.c b/gcc/builtins.c
index 4f1c818..66797fa 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -5699,7 +5699,7 @@ expand_builtin_thread_pointer (tree exp, rtx target)
   if (icode != CODE_FOR_nothing)
     {
       struct expand_operand op;
-      if (!REG_P (target) || GET_MODE (target) != Pmode)
+      if (target == NULL_RTX || !REG_P (target) || GET_MODE (target) != Pmode)
 	target = gen_reg_rtx (Pmode);
       create_output_operand (&op, target, Pmode);
       expand_insn (icode, 1, &op);
-- 
1.7.2.5