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(jump_optimize): When searching for a LOOP_END note to move,

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stop if we find a LOOP_BEG note first.

From-SVN: r8885
This commit is contained in:
Jim Wilson 1995-02-06 16:29:31 -08:00
parent 4f2d367490
commit ca188f1679
1 changed files with 21 additions and 14 deletions
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35
gcc/jump.c
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@ -1878,24 +1878,31 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan)
and moved the break sequence outside the loop.
We must move the LOOP_END note to where the
loop really ends now, or we will confuse loop
optimization. */
optimization. Stop if we find a LOOP_BEG note
first, since we don't want to move the LOOP_END
note in that case. */
for (;range2after != label2; range2after = rangenext)
{
rangenext = NEXT_INSN (range2after);
if (GET_CODE (range2after) == NOTE
&& (NOTE_LINE_NUMBER (range2after)
== NOTE_INSN_LOOP_END))
if (GET_CODE (range2after) == NOTE)
{
NEXT_INSN (PREV_INSN (range2after))
= rangenext;
PREV_INSN (rangenext)
= PREV_INSN (range2after);
PREV_INSN (range2after)
= PREV_INSN (range1beg);
NEXT_INSN (range2after) = range1beg;
NEXT_INSN (PREV_INSN (range1beg))
= range2after;
PREV_INSN (range1beg) = range2after;
if (NOTE_LINE_NUMBER (range2after)
== NOTE_INSN_LOOP_END)
{
NEXT_INSN (PREV_INSN (range2after))
= rangenext;
PREV_INSN (rangenext)
= PREV_INSN (range2after);
PREV_INSN (range2after)
= PREV_INSN (range1beg);
NEXT_INSN (range2after) = range1beg;
NEXT_INSN (PREV_INSN (range1beg))
= range2after;
PREV_INSN (range1beg) = range2after;
}
else if (NOTE_LINE_NUMBER (range2after)
== NOTE_INSN_LOOP_BEG)
break;
}
}
changed = 1;