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

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
b294ca38 · J"orn Rennecke · Jeff Law · 6186ed06 · b294ca38 · b294ca38
Commit b294ca38 authored Jul 06, 1998 by J"orn Rennecke Committed by Jeff Law Jul 06, 1998
Hide whitespace changes
Inline Side-by-side

Showing with 5 additions and 1 deletions

gcc/ChangeLog
+3 -0

gcc/reload1.c
+2 -1

No files found.
--- 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.


--- 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);