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From-SVN: r426
This commit is contained in:
Richard Kenner 1992-03-10 07:41:54 -05:00
parent db5dc21f76
commit d674b9e395
1 changed files with 12 additions and 4 deletions
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16
gcc/reorg.c
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@ -2674,7 +2674,7 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
int own_thread, own_opposite_thread;
int slots_to_fill, *pslots_filled;
{
rtx new_thread = thread;
rtx new_thread;
rtx delay_list = 0;
struct resources opposite_needed, set, needed;
rtx trial;
@ -2698,6 +2698,12 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
else
mark_target_live_regs (opposite_thread, &opposite_needed);
/* If the insn at THREAD can be split, do it here to avoid having to
update THREAD and NEW_THREAD if it is done in the loop below. Also
initialize NEW_THREAD. */
new_thread = thread = try_split (PATTERN (thread), thread);
/* Scan insns at THREAD. We are looking for an insn that can be removed
from THREAD (it neither sets nor references resources that were set
ahead of it and it doesn't set anything needs by the insns ahead of
@ -2895,7 +2901,8 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
/* If we haven't found anything for this delay slot and it is very
likely that the branch will be taken, see if the insn at our target
increments or decrements a register. If so, try to place the opposite
increments or decrements a register with an increment that does not
depend on the destination register. If so, try to place the opposite
arithmetic insn after the jump insn and put the arithmetic insn in the
delay slot. If we can't do this, return. */
if (delay_list == 0 && likely && new_thread && GET_CODE (new_thread) == INSN)
@ -2904,7 +2911,7 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
rtx dest;
rtx src;
trial = try_split (pat, new_thread, 0);
trial = new_thread;
pat = PATTERN (trial);
if (GET_CODE (trial) != INSN || GET_CODE (pat) != SET
@ -2913,7 +2920,8 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
dest = SET_DEST (pat), src = SET_SRC (pat);
if ((GET_CODE (src) == PLUS || GET_CODE (src) == MINUS)
&& rtx_equal_p (XEXP (src, 0), dest))
&& rtx_equal_p (XEXP (src, 0), dest)
&& ! reg_overlap_mentioned_p (dest, XEXP (src, 1)))
{
rtx other = XEXP (src, 1);
rtx new_arith;