jump.c (jump_optimize): When simplifying noop moves and PUSH_ROUNDING...

	* jump.c (jump_optimize): When simplifying noop moves and
	PUSH_ROUNDING, fix thinko so we use same criterion for identifying
	the PUSHes to rewrite in second loop as we did in the first.

From-SVN: r21318

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e92f02e50329aa311a21a41d317f3981ed5147fc..62f98f6d592cb5ee199be1e7bcf0f9ea9c0464dc 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+Tue Jul 21 03:59:08 1998  David S. Miller  <davem@pierdol.cobaltmicro.com>
+
+       * jump.c (jump_optimize): When simplifying noop moves and
+       PUSH_ROUNDING, fix thinko so we use same criterion for identifying
+       the PUSHes to rewrite in second loop as we did in the first.
+
 Tue Jul 21 00:31:01 1998  Jeffrey A Law  (law@cygnus.com)
 
        * configure.in: Fix minor problems with gas feature detection code.

diff --git a/gcc/jump.c b/gcc/jump.c
index fce3dc027718743597a6c44aa9edcb73c9453b17..dfc4ae64c3e16b5fb096a18bc1f9d83e7ff5f726 100644 (file)
--- a/gcc/jump.c
+++ b/gcc/jump.c
@@ -402,9 +402,14 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
                    if (GET_CODE (p) != INSN)
                      break;
                    pbody = PATTERN (p);
-                   if (GET_CODE (pbody) == SET)
+                   if (GET_CODE (pbody) != SET)
                      break;
                    dest = SET_DEST (pbody);
+                   /* Allow a no-op move between the adjust and the push.  */
+                   if (GET_CODE (dest) == REG
+                       && GET_CODE (SET_SRC (pbody)) == REG
+                       && REGNO (dest) == REGNO (SET_SRC (pbody)))
+                     continue;
                    if (! (GET_CODE (dest) == MEM
                           && GET_CODE (XEXP (dest, 0)) == POST_INC
                           && XEXP (XEXP (dest, 0), 0) == stack_pointer_rtx))