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loop-iv.c (simplify_using_initial_values): Return if the expression becomes invalid due to altered regs. 

* loop-iv.c (simplify_using_initial_values): Return if the
	expression becomes invalid due to altered regs.

From-SVN: r122291
This commit is contained in:
Bernd Schmidt 2007-02-24 16:30:51 +00:00 committed by Bernd Schmidt
parent f048ddccf0
commit 00c73ae637
2 changed files with 4 additions and 0 deletions
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gcc/ChangeLog
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@ -4,6 +4,8 @@
(determine_max_iter): Take additional LOOP arg; all callers changed.
Lose broken logic dealing with PLUS. Try to limit the upper bound by
one using simplifications.
(simplify_using_initial_values): Return if the expression becomes
invalid due to altered regs.
2007-02-23 DJ Delorie <dj@redhat.com>

2
gcc/loop-iv.c
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@ -1811,6 +1811,8 @@ simplify_using_initial_values (struct loop *loop, enum rtx_code op, rtx *expr)
FREE_REG_SET (altered);
return;
}
if (for_each_rtx (expr, altered_reg_used, altered))
return;
}
if (!single_pred_p (e->src)