sched.c (new_insn_dead_notes): Check if the register was used in the original instruction.

	* sched.c (new_insn_dead_notes): Check if the register was
	used in the original instruction.
	* haifa-sched.c (new_insn_dead_notes): Likewise.

From-SVN: r19494

gcc/ChangeLog

+Wed Apr 29 21:45:16 1998  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+	* sched.c (new_insn_dead_notes): Check if the register was
+	used in the original instruction.
+	* haifa-sched.c (new_insn_dead_notes): Likewise.
+
 Wed Apr 29 13:46:03 1998  Jim Wilson  <wilson@cygnus.com>
 
 	* dwarf2out.c (scope_die_for): If could not find proper scope,

gcc/haifa-sched.c

@@ -7621,6 +7621,13 @@ new_insn_dead_notes (pat, insn, last, orig_insn)
 
   if (GET_CODE (dest) == REG)
     {
+      /* If the original insn already used this register, we may not add new
+         notes for it.  One example for a split that needs this test is
+	 when a multi-word memory access with register-indirect addressing
+	 is split into multiple memory accesses with auto-increment and
+	 one adjusting add instruction for the address register.  */
+      if (reg_referenced_p (dest, PATTERN (orig_insn)))
+	return;
       for (tem = last; tem != insn; tem = PREV_INSN (tem))
 	{
 	  if (GET_RTX_CLASS (GET_CODE (tem)) == 'i'

gcc/sched.c

@@ -3655,6 +3655,13 @@ new_insn_dead_notes (pat, insn, last, orig_insn)
 
   if (GET_CODE (dest) == REG)
     {
+      /* If the original insn already used this register, we may not add new
+         notes for it.  One example for a split that needs this test is
+	 when a multi-word memory access with register-indirect addressing
+	 is split into multiple memory accesses with auto-increment and
+	 one adjusting add instruction for the address register.  */
+      if (reg_referenced_p (dest, PATTERN (orig_insn)))
+	return;
       for (tem = last; tem != insn; tem = PREV_INSN (tem))
 	{
 	  if (GET_RTX_CLASS (GET_CODE (tem)) == 'i'