From: Bernd Schmidt <bernds@cygnus.co.uk>
Date: Tue, 14 Dec 1999 19:54:41 +0000 (+0000)
Subject: Avoid reversing bivs with maybe_multiple set.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6979065c1686e69766a0fa871abb68bcfb83b1c6;p=gcc.git

Avoid reversing bivs with maybe_multiple set.

From-SVN: r30929
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7a23bb1c6f6..01016d13e19 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+1999-12-14  Bernd Schmidt  <bernds@cygnus.co.uk>
+
+	* loop.c (check_dbra_loop): Can't reverse a biv that has
+	maybe_multiple set.
+
 1999-12-14  Nick Clifton  <nickc@cygnus.com>
 
 	* config/arm/arm.c: Add support for -mcpu=arm720 command line
diff --git a/gcc/loop.c b/gcc/loop.c
index 9d55f815281..573a76aad6a 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -7953,6 +7953,7 @@ check_dbra_loop (loop_end, insn_count, loop_start, loop_info)
   for (bl = loop_iv_list; bl; bl = bl->next)
     {
       if (bl->biv_count == 1
+	  && ! bl->biv->maybe_multiple
 	  && bl->biv->dest_reg == XEXP (comparison, 0)
 	  && ! reg_used_between_p (regno_reg_rtx[bl->regno], bl->biv->insn,
 				   first_compare))