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From-SVN: r452
This commit is contained in:
Richard Kenner 1992-03-11 23:43:44 -05:00
parent 4e4b555d33
commit aa2c50d6b3
2 changed files with 14 additions and 50 deletions
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2
gcc/reload1.c
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@ -3231,7 +3231,7 @@ reload_as_needed (first, live_known)
register rtx next = NEXT_INSN (insn);
/* Notice when we move to a new basic block. */
if (live_known && basic_block_needs && this_block + 1 < n_basic_blocks
if (live_known && this_block + 1 < n_basic_blocks
&& insn == basic_block_head[this_block+1])
++this_block;

62
gcc/reorg.c
View File

@ -1758,71 +1758,35 @@ find_basic_block (insn)
return -1;
}
/* Used for communication between the following two routines, contains
the block number that insn was in. */
static int current_block_number;
/* Called via note_stores from update_block_status. It marks the
registers set in this insn as live at the start of the block whose
number is in current_block_number. */
static void
update_block_from_store (dest, x)
rtx dest;
rtx x;
{
int first_regno, last_regno;
int offset = 0;
int i;
if (GET_CODE (x) != SET
|| (GET_CODE (dest) != REG && (GET_CODE (dest) != SUBREG
|| GET_CODE (SUBREG_REG (dest)) != REG)))
return;
if (GET_CODE (dest) == SUBREG)
first_regno = REGNO (SUBREG_REG (dest)) + SUBREG_WORD (dest);
else
first_regno = REGNO (dest);
last_regno = first_regno + HARD_REGNO_NREGS (first_regno, GET_MODE (dest));
for (i = first_regno; i < last_regno; i++)
basic_block_live_at_start[current_block_number][i / HOST_BITS_PER_INT]
|= (1 << (i % HOST_BITS_PER_INT));
}
/* Called when INSN is being moved from a location near the target of a jump.
If WHERE is the first active insn at the start of its basic block, we can
just mark the registers set in INSN as live at the start of the basic block
that starts immediately before INSN.
Otherwise, we leave a marker of the form (use (INSN)) immediately in front
We leave a marker of the form (use (INSN)) immediately in front
of WHERE for mark_target_live_regs. These markers will be deleted when
reorg finishes. */
reorg finishes.
We used to try to update the live status of registers if WHERE is at
the start of a basic block, but that can't work since we may remove a
BARRIER in relax_delay_slots. */
static void
update_block (insn, where)
rtx insn;
rtx where;
{
int b;
/* Ignore if this was in a delay slot and it came from the target of
a branch. */
if (INSN_FROM_TARGET_P (insn))
return;
current_block_number = find_basic_block (insn);
if (current_block_number == -1)
return;
if (where == next_active_insn (basic_block_head[current_block_number]))
note_stores (PATTERN (insn), update_block_from_store);
else
emit_insn_before (gen_rtx (USE, VOIDmode, insn), where);
emit_insn_before (gen_rtx (USE, VOIDmode, insn), where);
/* INSN might be making a value live in a block where it didn't use to
be. So recompute liveness information for this block. */
bb_ticks[current_block_number]++;
b = find_basic_block (insn);
if (b != -1)
bb_ticks[b]++;
}
/* Marks registers possibly live at the current place being scanned by