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(reemit_notes): New function. 

(schedule_block): Call reemit_notes twice.  Reorganize code for
handling SCHED_GROUP_P insns, so that reemit_notes works.

From-SVN: r9814
This commit is contained in:
Jim Wilson 1995-05-24 18:41:18 -07:00
parent 20b04867c8
commit 6382ae03d8
1 changed files with 38 additions and 20 deletions
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58
gcc/sched.c
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@ -3103,6 +3103,33 @@ finish_sometimes_live (regs_sometimes_live, sometimes_max)
}
}
/* Search INSN for fake REG_DEAD notes for NOTE_INSN_SETJMP,
NOTE_INSN_LOOP_BEG, and NOTE_INSN_LOOP_END; and convert them back
into NOTEs. LAST is the last instruction output by the instruction
scheduler. Return the new value of LAST. */
static rtx
reemit_notes (insn, last)
rtx insn;
rtx last;
{
rtx note;
for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
{
if (REG_NOTE_KIND (note) == REG_DEAD
&& GET_CODE (XEXP (note, 0)) == CONST_INT)
{
if (INTVAL (XEXP (note, 0)) == NOTE_INSN_SETJMP)
emit_note_after (INTVAL (XEXP (note, 0)), insn);
else
last = emit_note_before (INTVAL (XEXP (note, 0)), last);
remove_note (insn, note);
}
}
return last;
}
/* Use modified list scheduling to rearrange insns in basic block
B. FILE, if nonzero, is where we dump interesting output about
this pass. */
@ -3858,22 +3885,7 @@ schedule_block (b, file)
last = insn;
/* Check to see if we need to re-emit any notes here. */
{
rtx note;
for (note = REG_NOTES (insn); note; note = XEXP (note, 1))
{
if (REG_NOTE_KIND (note) == REG_DEAD
&& GET_CODE (XEXP (note, 0)) == CONST_INT)
{
if (INTVAL (XEXP (note, 0)) == NOTE_INSN_SETJMP)
emit_note_after (INTVAL (XEXP (note, 0)), insn);
else
last = emit_note_before (INTVAL (XEXP (note, 0)), last);
remove_note (insn, note);
}
}
}
last = reemit_notes (insn, last);
/* Everything that precedes INSN now either becomes "ready", if
it can execute immediately before INSN, or "pending", if
@ -3888,7 +3900,8 @@ schedule_block (b, file)
/* Schedule all prior insns that must not be moved. */
if (SCHED_GROUP_P (insn))
{
/* Disable these insns from being launched. */
/* Disable these insns from being launched, in case one of the
insns in the group has a dependency on an earlier one. */
link = insn;
while (SCHED_GROUP_P (link))
{
@ -3897,17 +3910,22 @@ schedule_block (b, file)
INSN_REF_COUNT (link) = 0;
}
/* None of these insns can move forward into delay slots. */
/* Now handle each group insn like the main insn was handled
above. */
while (SCHED_GROUP_P (insn))
{
insn = PREV_INSN (insn);
new_ready = schedule_insn (insn, ready, new_ready, clock);
INSN_PRIORITY (insn) = DONE_PRIORITY;
sched_n_insns += 1;
NEXT_INSN (insn) = last;
PREV_INSN (last) = insn;
last = insn;
last = reemit_notes (insn, last);
/* ??? Why don't we set LAUNCH_PRIORITY here? */
new_ready = schedule_insn (insn, ready, new_ready, clock);
INSN_PRIORITY (insn) = DONE_PRIORITY;
}
}
}