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cfgcleanup.c (old_insns_match_p): Remove code to substitute REG_EQUAL/REG_EQUIV notes.

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* cfgcleanup.c (old_insns_match_p): Remove code to substitute
	REG_EQUAL/REG_EQUIV notes.

From-SVN: r148463
This commit is contained in:
Steven Bosscher 2009-06-13 23:15:48 +00:00
parent 1d24fdd92a
commit fb4c464040
2 changed files with 5 additions and 34 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-06-14 Steven Bosscher <steven@gcc.gnu.org>
* cfgcleanup.c (old_insns_match_p): Remove code to substitute
REG_EQUAL/REG_EQUIV notes.
2009-06-14 Richard Guenther <rguenther@suse.de>
PR middle-end/40389

34
gcc/cfgcleanup.c
View file

@ -1009,40 +1009,6 @@ old_insns_match_p (int mode ATTRIBUTE_UNUSED, rtx i1, rtx i2)
? rtx_renumbered_equal_p (p1, p2) : rtx_equal_p (p1, p2))
return true;
/* Do not do EQUIV substitution after reload. First, we're undoing the
work of reload_cse. Second, we may be undoing the work of the post-
reload splitting pass. */
/* ??? Possibly add a new phase switch variable that can be used by
targets to disallow the troublesome insns after splitting. */
if (!reload_completed)
{
/* The following code helps take care of G++ cleanups. */
rtx equiv1 = find_reg_equal_equiv_note (i1);
rtx equiv2 = find_reg_equal_equiv_note (i2);
if (equiv1 && equiv2
/* If the equivalences are not to a constant, they may
reference pseudos that no longer exist, so we can't
use them. */
&& (! reload_completed
|| (CONSTANT_P (XEXP (equiv1, 0))
&& rtx_equal_p (XEXP (equiv1, 0), XEXP (equiv2, 0)))))
{
rtx s1 = single_set (i1);
rtx s2 = single_set (i2);
if (s1 != 0 && s2 != 0
&& rtx_renumbered_equal_p (SET_DEST (s1), SET_DEST (s2)))
{
validate_change (i1, &SET_SRC (s1), XEXP (equiv1, 0), 1);
validate_change (i2, &SET_SRC (s2), XEXP (equiv2, 0), 1);
if (! rtx_renumbered_equal_p (p1, p2))
cancel_changes (0);
else if (apply_change_group ())
return true;
}
}
}
return false;
}