From: J"orn Rennecke <amylaar@cygnus.co.uk>
Date: Mon, 6 Jul 1998 22:55:30 +0000 (+0000)
Subject: reload1.c (delete_dead_insn): Don't delete feeding insn if that insn has side effects.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b294ca3876dd7469827b0fcf4b542c79565c3cee;p=gcc.git

reload1.c (delete_dead_insn): Don't delete feeding insn if that insn has side effects.

	* reload1.c (delete_dead_insn): Don't delete feeding insn
	if that insn has side effects.

From-SVN: r20975
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index b47a5327d56..bc811716fb7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -13,6 +13,9 @@ Mon Jul  6 22:50:48 1998  Jason Merrill  <jason@yorick.cygnus.com>
 
 Mon Jul  6 22:47:55 1998  J"orn Rennecke <amylaar@cygnus.co.uk>
 
+	* reload1.c (delete_dead_insn): Don't delete feeding insn
+	if that insn has side effects.
+
 	* flow.c (find_auto_inc): Clear UNCHANGING bit of register that is
 	changed.
 
diff --git a/gcc/reload1.c b/gcc/reload1.c
index 73fd5d9823f..456abb04edd 100644
--- a/gcc/reload1.c
+++ b/gcc/reload1.c
@@ -2449,7 +2449,8 @@ delete_dead_insn (insn)
   if (prev && GET_CODE (PATTERN (prev)) == SET
       && (prev_dest = SET_DEST (PATTERN (prev)), GET_CODE (prev_dest) == REG)
       && reg_mentioned_p (prev_dest, PATTERN (insn))
-      && find_regno_note (insn, REG_DEAD, REGNO (prev_dest)))
+      && find_regno_note (insn, REG_DEAD, REGNO (prev_dest))
+      && ! side_effects_p (SET_SRC (PATTERN (prev))))
     delete_dead_insn (prev);
 
   PUT_CODE (insn, NOTE);