Avoid reversing bivs with maybe_multiple set.

From-SVN: r30929

Avoid reversing bivs with maybe_multiple set.
From-SVN: r30929
6979065c · Bernd Schmidt · Bernd Schmidt · a120a3bd · 6979065c · 6979065c
Commit 6979065c authored Dec 14, 1999 by Bernd Schmidt Committed by Bernd Schmidt Dec 14, 1999
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gcc/ChangeLog
+5 -0

gcc/loop.c
+1 -0

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--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
+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

--- 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))