[AArch64, ILP32] 6/6 Add support for "wsp" register.

gcc/

	* config/aarch64/aarch64.c (aarch64_hard_regno_mode_ok): Also return
	true for SP_REGNUM if mode == ptr_mode.
	* config/aarch64/aarch64.h (ADDITIONAL_REGISTER_NAMES): Add "wsp"
	with value R0_REGNUM + 31.

From-SVN: r201170

gcc/ChangeLog

 2013-07-23  Yufeng Zhang  <yufeng.zhang@arm.com>
 
+	* config/aarch64/aarch64.c (aarch64_hard_regno_mode_ok): Also return
+	true for SP_REGNUM if mode == ptr_mode.
+	* config/aarch64/aarch64.h (ADDITIONAL_REGISTER_NAMES): Add "wsp"
+	with value R0_REGNUM + 31.
+
+2013-07-23  Yufeng Zhang  <yufeng.zhang@arm.com>
+
 	* config/aarch64/aarch64.c (aarch64_pad_arg_upward): In big-endian,
 	pad pointer-typed argument downward.
 

gcc/config/aarch64/aarch64.c

@@ -382,8 +382,13 @@ aarch64_hard_regno_mode_ok (unsigned regno, enum machine_mode mode)
   if (GET_MODE_CLASS (mode) == MODE_CC)
     return regno == CC_REGNUM;
 
-  if (regno == SP_REGNUM || regno == FRAME_POINTER_REGNUM
-      || regno == ARG_POINTER_REGNUM)
+  if (regno == SP_REGNUM)
+    /* The purpose of comparing with ptr_mode is to support the
+       global register variable associated with the stack pointer
+       register via the syntax of asm ("wsp") in ILP32.  */
+    return mode == Pmode || mode == ptr_mode;
+
+  if (regno == FRAME_POINTER_REGNUM || regno == ARG_POINTER_REGNUM)
     return mode == Pmode;
 
   if (GP_REGNUM_P (regno) && ! aarch64_vect_struct_mode_p (mode))

gcc/config/aarch64/aarch64.h

@@ -278,7 +278,7 @@ extern unsigned long aarch64_tune_flags;
     R_ALIASES(16), R_ALIASES(17), R_ALIASES(18), R_ALIASES(19), \
     R_ALIASES(20), R_ALIASES(21), R_ALIASES(22), R_ALIASES(23), \
     R_ALIASES(24), R_ALIASES(25), R_ALIASES(26), R_ALIASES(27), \
-    R_ALIASES(28), R_ALIASES(29), R_ALIASES(30), /* 31 omitted  */ \
+    R_ALIASES(28), R_ALIASES(29), R_ALIASES(30), {"wsp", R0_REGNUM + 31}, \
     V_ALIASES(0),  V_ALIASES(1),  V_ALIASES(2),  V_ALIASES(3),  \
     V_ALIASES(4),  V_ALIASES(5),  V_ALIASES(6),  V_ALIASES(7),  \
     V_ALIASES(8),  V_ALIASES(9),  V_ALIASES(10), V_ALIASES(11), \