From: J"orn Rennecke <amylaar@cygnus.co.uk>
Date: Wed, 29 Apr 1998 13:53:20 +0000 (+0000)
Subject: sched.c (new_insn_dead_notes): Check if the register was used in the original instruc... 
X-Git-Tag: prereleases/egcs-1.1-prerelease~1493
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=93da030f633623de87801b2aea0b8cfe79edebc2;p=thirdparty%2Fgcc.git

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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 42f71194c5b1..b0c68c2b9679 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+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,
diff --git a/gcc/haifa-sched.c b/gcc/haifa-sched.c
index 8d220f04ee32..7fccfd2be793 100644
--- a/gcc/haifa-sched.c
+++ b/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'
diff --git a/gcc/sched.c b/gcc/sched.c
index a44002e12a78..635dceba09d4 100644
--- a/gcc/sched.c
+++ b/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'