sched.c (update_flow_info, REG_WAS_0): Ignore if setting insn was deleted.

	* sched.c (update_flow_info, REG_WAS_0): Ignore if setting insn
	was deleted.
	* haifa-sched.c (update_flow_info, REG_WAS_0): Likewise.

From-SVN: r17963

gcc/ChangeLog

+Fri Feb 13 20:36:05 1998  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+	* sched.c (update_flow_info, REG_WAS_0): Ignore if setting insn
+	was deleted.
+	* haifa-sched.c (update_flow_info, REG_WAS_0): Likewise.
+
 Fri Feb 13 12:18:40 1998  Jeffrey A Law  (law@cygnus.com)
 
 	* genextract.c (main): Fix typo.

gcc/haifa-sched.c

@@ -7978,6 +7978,14 @@ update_flow_info (notes, first, last, orig_insn)
 	  break;
 
 	case REG_WAS_0:
+	  /* If the insn that set the register to 0 was deleted, this
+	     note cannot be relied on any longer.  The destination might
+	     even have been moved to memory.
+             This was observed for SH4 with execute/920501-6.c compilation,
+	     -O2 -fomit-frame-pointer -finline-functions .  */
+	  if (GET_CODE (XEXP (note, 0)) == NOTE
+	      || INSN_DELETED_P (XEXP (note, 0)))
+	    break;
 	  /* This note applies to the dest of the original insn.  Find the
 	     first new insn that now has the same dest, and move the note
 	     there.  */

gcc/sched.c

@@ -3854,6 +3854,14 @@ update_flow_info (notes, first, last, orig_insn)
 	  break;
 
 	case REG_WAS_0:
+	  /* If the insn that set the register to 0 was deleted, this
+	     note cannot be relied on any longer.  The destination might
+	     even have been moved to memory.
+             This was observed for SH4 with execute/920501-6.c compilation,
+	     -O2 -fomit-frame-pointer -finline-functions .  */
+	  if (GET_CODE (XEXP (note, 0)) == NOTE
+	      || INSN_DELETED_P (XEXP (note, 0)))
+	    break;
 	  /* This note applies to the dest of the original insn.  Find the
 	     first new insn that now has the same dest, and move the note
 	     there.  */