From: Bernd Schmidt <bernds@redhat.co.uk>
Date: Thu, 11 Jan 2001 18:05:38 +0000 (+0000)
Subject: Disable a minor optimization in cases where it would lose a REG_LABEL note.
X-Git-Tag: prereleases/gcc-2.95.3-test2~9
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=edbcc676ee21a4236d23a1669d35d6b9a84decb9;p=thirdparty%2Fgcc.git

Disable a minor optimization in cases where it would lose a REG_LABEL note.

From-SVN: r38914
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9848e5782fc5..2575e7d1dae7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,8 @@
 2001-01-11  Bernd Schmidt  <bernds@redhat.co.uk>
 
+	* loop.c (scan_loop): Disable copy propagation if we find a REG_LABEL
+	note.
+
 	Revert this patch:
 	2000-12-18  David Edelsohn  <edelsohn@gnu.org>
 	* rs6000.c (and64_operand): Use logical_u_operand.
diff --git a/gcc/loop.c b/gcc/loop.c
index d7242ed04eb2..a231058ca137 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -919,6 +919,7 @@ scan_loop (loop_start, end, loop_cont, unroll_p, bct_p)
 		  && VARRAY_INT (set_in_loop, regno) == 1
 		  && ! side_effects_p (SET_SRC (set))
 		  && ! find_reg_note (p, REG_RETVAL, NULL_RTX)
+		  && ! find_reg_note (p, REG_LABEL, NULL_RTX)
 		  && (! SMALL_REGISTER_CLASSES
 		      || (! (GET_CODE (SET_SRC (set)) == REG
 			     && REGNO (SET_SRC (set)) < FIRST_PSEUDO_REGISTER)))