[patch] explow.c: Remove stabilize and its subroutine.

[Kazu Hirata <kazu at cs dot umass dot edu>]

Hi,

Attached is a patch to remove stabilize and copy_all_regs as they are
unused.

AFAICT, the last use of stabilize was removed in

http://gcc.gnu.org/ml/gcc-patches/2004-07/msg00953.html

Even then the last use was surrounded by #if 0, so the function has
been unused for at least half a year.

Note that copy_all_regs is a subroutine of stabilize.

Bootstrapped on i686-pc-linux-gnu.  OK to apply?

Kazu Hirata

2005-01-14  Kazu Hirata  <kazu@cs.umass.edu>

	* explow.c (copy_all_reg, stabilize): Remove.
	* expr.h: Remove the corresponding prototypes.

Index: explow.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/explow.c,v
retrieving revision 1.141
diff -u -d -p -r1.141 explow.c
--- explow.c	11 Nov 2004 23:14:20 -0000	1.141
+++ explow.c	14 Jan 2005 08:46:24 -0000
@@ -390,44 +390,6 @@ convert_memory_address (enum machine_mod
 			x, POINTERS_EXTEND_UNSIGNED);
 #endif /* defined(POINTERS_EXTEND_UNSIGNED) */
 }
-
-/* Given a memory address or facsimile X, construct a new address,
-   currently equivalent, that is stable: future stores won't change it.
-
-   X must be composed of constants, register and memory references
-   combined with addition, subtraction and multiplication:
-   in other words, just what you can get from expand_expr if sum_ok is 1.
-
-   Works by making copies of all regs and memory locations used
-   by X and combining them the same way X does.
-   You could also stabilize the reference to this address
-   by copying the address to a register with copy_to_reg;
-   but then you wouldn't get indexed addressing in the reference.  */
-
-rtx
-copy_all_regs (rtx x)
-{
-  if (REG_P (x))
-    {
-      if (REGNO (x) != FRAME_POINTER_REGNUM
-#if HARD_FRAME_POINTER_REGNUM != FRAME_POINTER_REGNUM
-	  && REGNO (x) != HARD_FRAME_POINTER_REGNUM
-#endif
-	  )
-	x = copy_to_reg (x);
-    }
-  else if (MEM_P (x))
-    x = copy_to_reg (x);
-  else if (GET_CODE (x) == PLUS || GET_CODE (x) == MINUS
-	   || GET_CODE (x) == MULT)
-    {
-      rtx op0 = copy_all_regs (XEXP (x, 0));
-      rtx op1 = copy_all_regs (XEXP (x, 1));
-      if (op0 != XEXP (x, 0) || op1 != XEXP (x, 1))
-	x = gen_rtx_fmt_ee (GET_CODE (x), Pmode, op0, op1);
-    }
-  return x;
-}
 
 /* Return something equivalent to X but valid as a memory address
    for something of mode MODE.  When X is not itself valid, this
@@ -576,22 +538,6 @@ validize_mem (rtx ref)
   return replace_equiv_address (ref, XEXP (ref, 0));
 }
 
-/* Return a modified copy of X with its memory address copied
-   into a temporary register to protect it from side effects.
-   If X is not a MEM, it is returned unchanged (and not copied).
-   Perhaps even if it is a MEM, if there is no need to change it.  */
-
-rtx
-stabilize (rtx x)
-{
-  if (!MEM_P (x)
-      || ! rtx_unstable_p (XEXP (x, 0)))
-    return x;
-
-  return
-    replace_equiv_address (x, force_reg (Pmode, copy_all_regs (XEXP (x, 0))));
-}
-
 /* Copy the value or contents of X to a new temp reg and return that reg.  */
 
 rtx
Index: expr.h
===================================================================
RCS file: /cvs/gcc/gcc/gcc/expr.h,v
retrieving revision 1.185
diff -u -d -p -r1.185 expr.h
--- expr.h	11 Jan 2005 09:51:16 -0000	1.185
+++ expr.h	14 Jan 2005 08:46:24 -0000
@@ -642,14 +642,6 @@ extern void set_mem_attributes_minus_bit
 /* Assemble the static constant template for function entry trampolines.  */
 extern rtx assemble_trampoline_template (void);
 
-/* Given rtx, return new rtx whose address won't be affected by
-   any side effects.  It has been copied to a new temporary reg.  */
-extern rtx stabilize (rtx);
-
-/* Given an rtx, copy all regs it refers to into new temps
-   and return a modified copy that refers to the new temps.  */
-extern rtx copy_all_regs (rtx);
-
 /* Copy given rtx to a new temp reg and return that.  */
 extern rtx copy_to_reg (rtx);