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From-SVN: r565
This commit is contained in:
Richard Kenner 1992-03-22 13:16:15 -05:00
parent 6d51800282
commit 9b72fab4b7
1 changed files with 8 additions and 7 deletions
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15
gcc/reorg.c
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@ -2820,21 +2820,22 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
We could check for more complex cases than those tested below,
but it doesn't seem worth it. It might also be a good idea to try
to swap the two insns. That might do better. */
to swap the two insns. That might do better.
We can't do this if the next insn modifies our source, because that
would make the replacement into the insn invalid. This also
prevents updating the contents of a PRE_INC. */
if (GET_CODE (trial) == INSN && GET_CODE (pat) == SET
&& GET_CODE (SET_SRC (pat)) == REG
&& GET_CODE (SET_DEST (pat)) == REG)
{
rtx next = next_nonnote_insn (trial);
int our_dest = REGNO (SET_DEST (pat));
if (next && GET_CODE (next) == INSN
&& GET_CODE (PATTERN (next)) == SET
&& GET_CODE (SET_DEST (PATTERN (next))) == REG
&& REGNO (SET_DEST (PATTERN (next))) != our_dest
&& refers_to_regno_p (our_dest, our_dest + 1,
SET_SRC (PATTERN (next)), 0))
&& GET_CODE (PATTERN (next)) != USE
&& ! reg_set_p (SET_DEST (pat), next)
&& reg_referenced_p (SET_DEST (pat), PATTERN (next)))
validate_replace_rtx (SET_DEST (pat), SET_SRC (pat), next);
}
}