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[PATCH, AArch64] Add support for "wsp" register


Hi,

This patch adds support for the register "wsp"; in ILP32, this is necessary in order to support the global register variable associated the stack pointer with the syntax asm ("wsp"); it is used in libgloss to get the stack pointer.

OK for the trunk?

Thanks,
Yufeng


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.
diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 7049651..46c11bc 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -358,8 +358,13 @@ 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))
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index e1fa413..0924269 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/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), \

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