From 632c9d9e7ec43f0a414454b1711acb572fad9759 Mon Sep 17 00:00:00 2001
From: Mike Stump <mrs@gcc.gnu.org>
Date: Wed, 21 Aug 1996 23:03:07 +0000
Subject: [PATCH] flow.c (life_analysis): Preserve registers used by the
 epilogue.

	* flow.c (life_analysis): Preserve registers used by the epilogue.
	(mark_used_regs): Likewise.
	* reorg.c (fill_simple_delay_slots): Likewise.
	(dbr_schedule): Likewise.
Fixes eh49.C for sparc.

From-SVN: r12666
---
 gcc/flow.c  | 19 ++++++++++++++-----
 gcc/reorg.c | 14 +++++++++++++-
 2 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/gcc/flow.c b/gcc/flow.c
index d38e56df64e..86d72286331 100644
--- a/gcc/flow.c
+++ b/gcc/flow.c
@@ -1087,12 +1087,17 @@ life_analysis (f, nregs)
 #endif      
       }
 
-  /* Mark all global registers as being live at the end of the function
-     since they may be referenced by our caller.  */
+  /* Mark all global registers and all registers used by the epilogue
+     as being live at the end of the function since they may be
+     referenced by our caller.  */
 
   if (n_basic_blocks > 0)
     for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
-      if (global_regs[i])
+      if (global_regs[i]
+#ifdef EPILOGUE_USES
+	  || EPILOGUE_USES (i)
+#endif
+	  )
 	{
 	  basic_block_live_at_end[n_basic_blocks - 1]
 	    [i / REGSET_ELT_BITS]
@@ -2665,7 +2670,7 @@ mark_used_regs (needed, live, x, final, insn)
     case RETURN:
       /* If exiting needs the right stack value, consider this insn as
 	 using the stack pointer.  In any event, consider it as using
-	 all global registers.  */
+	 all global registers and all registers used by return.  */
 
 #ifdef EXIT_IGNORE_STACK
       if (! EXIT_IGNORE_STACK
@@ -2675,7 +2680,11 @@ mark_used_regs (needed, live, x, final, insn)
 	  |= (REGSET_ELT_TYPE) 1 << (STACK_POINTER_REGNUM % REGSET_ELT_BITS);
 
       for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
-	if (global_regs[i])
+	if (global_regs[i]
+#ifdef EPILOGUE_USES
+	    || EPILOGUE_USES (i)
+#endif
+	    )
 	  live[i / REGSET_ELT_BITS]
 	    |= (REGSET_ELT_TYPE) 1 << (i % REGSET_ELT_BITS);
       break;
diff --git a/gcc/reorg.c b/gcc/reorg.c
index 54ad9389aa0..beec1681cb4 100644
--- a/gcc/reorg.c
+++ b/gcc/reorg.c
@@ -3344,6 +3344,14 @@ fill_simple_delay_slots (first, non_jumps_p)
   else
     SET_HARD_REG_BIT (needed.regs, STACK_POINTER_REGNUM);
 
+#ifdef EPILOGUE_USES
+  for (i = 0; i <FIRST_PSEUDO_REGISTER; i++)
+    {
+      if (EPILOGUE_USES (i))
+	SET_HARD_REG_BIT (needed.regs, i);
+    }
+#endif
+
   for (trial = get_last_insn (); ! stop_search_p (trial, 1);
        trial = PREV_INSN (trial))
     {
@@ -4450,7 +4458,11 @@ dbr_schedule (first, file)
 			       &end_of_function_needs, 1);
 
   for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
-    if (global_regs[i])
+    if (global_regs[i]
+#ifdef EPILOGUE_USES
+	|| EPILOGUE_USES (i)
+#endif
+	)
       SET_HARD_REG_BIT (end_of_function_needs.regs, i);
 
   /* The registers required to be live at the end of the function are
-- 
2.30.2