From 89d3d4424947aa2328d79659144f3bbad6998255 Mon Sep 17 00:00:00 2001
From: Andrew MacLeod <amacleod@cygnus.com>
Date: Mon, 22 Feb 1999 14:11:58 +0000
Subject: [PATCH] loop.c (libcall_other_regs): Make extern.

	* loop.c (libcall_other_regs): Make extern.
	* rtl.h (find_last_value): Add parameter to prototype.
	(libcall_other_reg): Add extern declaration.
	* rtlanal.c (find_last_value): Add another parameter to allow
	a definition using a hardware register to be found as well.

From-SVN: r25378
---
 gcc/ChangeLog |  8 ++++++++
 gcc/loop.c    |  3 +--
 gcc/rtl.h     |  3 ++-
 gcc/rtlanal.c | 10 ++++++----
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 321077fb4cb..ab0a16bfa9f 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,11 @@
+Mon Feb 22 16:54:18 EST 1999  Andrew MacLeod  <amacleod@cygnus.com>
+
+	* loop.c (libcall_other_regs): Make extern.
+	* rtl.h (find_last_value): Add parameter to prototype.
+	(libcall_other_reg): Add extern declaration.
+	* rtlanal.c (find_last_value): Add another parameter to allow
+	a definition using a hardware register to be found as well.
+
 Mon Feb 22 13:33:47 1999  Mark Mitchell  <mark@markmitchell.com>
 
 	* cse.c (dump_class): New function.
diff --git a/gcc/loop.c b/gcc/loop.c
index 962736f9f6a..cd77cddee5c 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -291,7 +291,6 @@ static void mark_loop_jump PROTO((rtx, int));
 static void prescan_loop PROTO((rtx, rtx));
 static int reg_in_basic_block_p PROTO((rtx, rtx));
 static int consec_sets_invariant_p PROTO((rtx, int, rtx));
-static rtx libcall_other_reg PROTO((rtx, rtx));
 static int labels_in_range_p PROTO((rtx, int));
 static void count_one_set PROTO((rtx, rtx, varray_type, rtx *));
 
@@ -1241,7 +1240,7 @@ record_excess_regs (in_this, not_in_this, output)
    If there are none, return 0.
    If there are one or more, return an EXPR_LIST containing all of them.  */
 
-static rtx
+rtx
 libcall_other_reg (insn, equiv)
      rtx insn, equiv;
 {
diff --git a/gcc/rtl.h b/gcc/rtl.h
index f036a6fe917..2839c883502 100644
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -1013,7 +1013,7 @@ extern int modified_in_p		PROTO((rtx, rtx));
 extern int reg_set_p			PROTO((rtx, rtx));
 extern rtx single_set			PROTO((rtx));
 extern int multiple_sets		PROTO((rtx));
-extern rtx find_last_value		PROTO((rtx, rtx *, rtx));
+extern rtx find_last_value		PROTO((rtx, rtx *, rtx, int));
 extern int refers_to_regno_p		PROTO((int, int, rtx, rtx *));
 extern int reg_overlap_mentioned_p	PROTO((rtx, rtx));
 extern void note_stores			PROTO((rtx, void (*)()));
@@ -1390,6 +1390,7 @@ extern void print_inline_rtx		PROTO ((FILE *, rtx, int));
 
 /* In loop.c */
 extern void init_loop			PROTO ((void));
+extern rtx libcall_other_reg		PROTO ((rtx, rtx));
 #ifdef BUFSIZ
 extern void loop_optimize		PROTO ((rtx, FILE *, int, int));
 #endif
diff --git a/gcc/rtlanal.c b/gcc/rtlanal.c
index 41744d747a2..1dabc369c18 100644
--- a/gcc/rtlanal.c
+++ b/gcc/rtlanal.c
@@ -740,13 +740,15 @@ multiple_sets (insn)
 /* Return the last thing that X was assigned from before *PINSN.  Verify that
    the object is not modified up to VALID_TO.  If it was, if we hit
    a partial assignment to X, or hit a CODE_LABEL first, return X.  If we
-   found an assignment, update *PINSN to point to it.  */
+   found an assignment, update *PINSN to point to it.  
+   ALLOW_HWREG is set to 1 if hardware registers are allowed to be the src.  */
 
 rtx
-find_last_value (x, pinsn, valid_to)
+find_last_value (x, pinsn, valid_to, allow_hwreg)
      rtx x;
      rtx *pinsn;
      rtx valid_to;
+     int allow_hwreg;
 {
   rtx p;
 
@@ -767,8 +769,8 @@ find_last_value (x, pinsn, valid_to)
 	    if (! modified_between_p (src, PREV_INSN (p), valid_to)
 		/* Reject hard registers because we don't usually want
 		   to use them; we'd rather use a pseudo.  */
-		&& ! (GET_CODE (src) == REG
-		      && REGNO (src) < FIRST_PSEUDO_REGISTER))
+		&& (! (GET_CODE (src) == REG
+		      && REGNO (src) < FIRST_PSEUDO_REGISTER) || allow_hwreg))
 	      {
 		*pinsn = p;
 		return src;