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(schedule_insns): If there was no first scheduling pass,

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split instructions after reload.
(update_flow_info): Tolerate some idiosyncrasies after reload.

From-SVN: r13666
This commit is contained in:
Jim Wilson 1997-02-19 13:42:25 -08:00
parent 101c1a3d93
commit e02fbefc82
1 changed files with 41 additions and 2 deletions
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43
gcc/sched.c
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@ -4452,6 +4452,15 @@ update_flow_info (notes, first, last, orig_insn)
pattern, so we can safely ignore it. */
if (insn == first)
{
/* After reload, REG_DEAD notes come sometimes an
instruction after the register actually dies. */
if (reload_completed && REG_NOTE_KIND (note) == REG_DEAD)
{
XEXP (note, 1) = REG_NOTES (insn);
REG_NOTES (insn) = note;
break;
}
if (REG_NOTE_KIND (note) != REG_UNUSED)
abort ();
@ -4480,6 +4489,15 @@ update_flow_info (notes, first, last, orig_insn)
uses it. */
break;
}
/* If this note refers to a multiple word hard
register, it may have been split into several smaller
hard register references. We could split the notes,
but simply dropping them is good enough. */
if (GET_CODE (orig_dest) == REG
&& REGNO (orig_dest) < FIRST_PSEUDO_REGISTER
&& HARD_REGNO_NREGS (REGNO (orig_dest),
GET_MODE (orig_dest)) > 1)
break;
/* It must be set somewhere, fail if we couldn't find where it
was set. */
if (insn == last)
@ -4516,7 +4534,22 @@ update_flow_info (notes, first, last, orig_insn)
/* The original dest must still be set someplace. Abort if we
couldn't find it. */
if (insn == first)
abort ();
{
/* However, if this note refers to a multiple word hard
register, it may have been split into several smaller
hard register references. We could split the notes,
but simply dropping them is good enough. */
if (GET_CODE (orig_dest) == REG
&& REGNO (orig_dest) < FIRST_PSEUDO_REGISTER
&& HARD_REGNO_NREGS (REGNO (orig_dest),
GET_MODE (orig_dest)) > 1)
break;
/* Likewise for multi-word memory references. */
if (GET_CODE (orig_dest) == MEM
&& SIZE_FOR_MODE (orig_dest) > MOVE_MAX)
break;
abort ();
}
}
break;
@ -4563,6 +4596,9 @@ update_flow_info (notes, first, last, orig_insn)
break;
case REG_INC:
/* reload sometimes leaves obsolete REG_INC notes around. */
if (reload_completed)
break;
/* This should be moved to whichever instruction now has the
increment operation. */
abort ();
@ -4945,7 +4981,10 @@ schedule_insns (dump_file)
/* Split insns here to get max fine-grain parallelism. */
prev = PREV_INSN (insn);
if (reload_completed == 0)
/* It is probably not worthwhile to try to split again in the
second pass. However, if flag_schedule_insns is not set,
the first and only (if any) scheduling pass is after reload. */
if (reload_completed == 0 || ! flag_schedule_insns)
{
rtx last, first = PREV_INSN (insn);
rtx notes = REG_NOTES (insn);