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* gcse.c (cprop_jump): Use the REG_EQUAL note if available.

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From-SVN: r63332
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Kazu Hirata 2003-02-23 20:52:44 +00:00 committed by Kazu Hirata
parent 7b652bb8eb
commit ef90638128
2 changed files with 24 additions and 6 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2003-02-23 Kazu Hirata <kazu@cs.umass.edu>
* gcse.c (cprop_jump): Use the REG_EQUAL note if available.
2003-02-23 Kaveh R. Ghazi <ghazi@caip.rutgers.edu>
* doc/invoke.texi (ggc-min-expand, ggc-min-heapsize): Document

26
gcc/gcse.c
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@ -4058,19 +4058,33 @@ cprop_jump (bb, setcc, jump, from, src)
&& !modified_between_p (src, setcc, jump))
{
rtx setcc_set = single_set (setcc);
rtx note = find_reg_equal_equiv_note (setcc);
/* Use REG_EQUAL note if available. */
rtx setcc_set_src = (note == 0) ? SET_SRC (setcc_set) : XEXP (note, 0);
new_set = simplify_replace_rtx (SET_SRC (set),
SET_DEST (setcc_set),
SET_SRC (setcc_set));
setcc_set_src);
}
else
new_set = set;
new = simplify_replace_rtx (new_set, from, src);
/* If NEW_SET is simplified down to either a label or a no-op, we
don't have to replace FROM with SRC, but we still have to either
turn JUMP to an unconditional branch or remove the no-op. This
can happen if JUMP is simplified using the REG_EQUAL note in
SETCC. */
if (GET_CODE (new_set) == LABEL_REF || new_set == pc_rtx)
new = new_set;
else
{
new = simplify_replace_rtx (new_set, from, src);
/* If no simplification can be made, then try the next
register. */
if (rtx_equal_p (new, new_set) || rtx_equal_p (new, SET_SRC (set)))
return 0;
/* If no simplification can be made, then try the next
register. */
if (rtx_equal_p (new, new_set) || rtx_equal_p (new, SET_SRC (set)))
return 0;
}
/* If this is now a no-op delete it, otherwise this must be a valid insn. */
if (new == pc_rtx)