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(relax_delay_slots): Delete jump around insn identical

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to the insn in its delay slot.

From-SVN: r3606
This commit is contained in:
Jim Wilson 1993-03-02 13:05:09 -08:00
parent fda792c6b6
commit 51ec237564
1 changed files with 13 additions and 0 deletions
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13
gcc/reorg.c
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@ -3440,6 +3440,19 @@ relax_delay_slots (first)
continue;
}
/* See if this is an unconditional jump around a single insn which is
identical to the one in its delay slot. In this case, we can just
delete the branch and the insn in its delay slot. */
if (next && GET_CODE (next) == INSN
&& prev_label (next_active_insn (next)) == target_label
&& simplejump_p (insn)
&& XVECLEN (pat, 0) == 2
&& rtx_equal_p (PATTERN (next), PATTERN (XVECEXP (pat, 0, 1))))
{
delete_insn (insn);
continue;
}
/* See if this jump (with its delay slots) branches around another
jump (without delay slots). If so, invert this jump and point
it to the target of the second jump. We cannot do this for