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bb-reorder.c (fixup_reorder_chain): Add jump in new block after switch for CASE_DROPS_THROUGH.

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* bb-reorder.c (fixup_reorder_chain): Add jump in new block
        after switch for CASE_DROPS_THROUGH.

From-SVN: r36253
This commit is contained in:
Richard Henderson 2000-09-07 17:25:05 -07:00 committed by Richard Henderson
parent 7f586614b6
commit 0d45144b57
2 changed files with 21 additions and 11 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2000-09-07 Richard Henderson <rth@cygnus.com>
* bb-reorder.c (fixup_reorder_chain): Add jump in new block
after switch for CASE_DROPS_THROUGH.
2000-09-07 Richard Henderson <rth@cygnus.com>
* loop.c (strength_reduce): Call check_ext_dependant_givs.

27
gcc/bb-reorder.c
View File

@ -549,7 +549,7 @@ fixup_reorder_chain ()
for (bb = BASIC_BLOCK (0); bb ; bb = RBI (bb)->next)
{
edge e_fall, e_taken, e;
rtx jump_insn, barrier_insn;
rtx jump_insn, barrier_insn, bb_end_insn;
basic_block nb;
if (bb->succ == NULL)
@ -564,9 +564,10 @@ fixup_reorder_chain ()
else if (! (e->flags & EDGE_EH))
e_taken = e;
if (GET_CODE (bb->end) == JUMP_INSN)
bb_end_insn = bb->end;
if (GET_CODE (bb_end_insn) == JUMP_INSN)
{
if (any_uncondjump_p (bb->end))
if (any_uncondjump_p (bb_end_insn))
{
/* If the destination is still not next, nothing to do. */
if (RBI (bb)->index + 1 != RBI (e_taken->dest)->index)
@ -582,7 +583,7 @@ fixup_reorder_chain ()
bb->index, RBI (bb)->index);
continue;
}
else if (any_condjump_p (bb->end))
else if (any_condjump_p (bb_end_insn))
{
/* If the old fallthru is still next, nothing to do. */
if (RBI (bb)->index + 1 == RBI (e_fall->dest)->index
@ -596,10 +597,11 @@ fixup_reorder_chain ()
edge based on known or assumed probability. */
if (RBI (bb)->index + 1 != RBI (e_taken->dest)->index)
{
rtx note = find_reg_note (bb->end, REG_BR_PROB, 0);
rtx note = find_reg_note (bb_end_insn, REG_BR_PROB, 0);
if (note
&& INTVAL (XEXP (note, 0)) < REG_BR_PROB_BASE / 2
&& invert_jump (bb->end, label_for_bb (e_fall->dest), 0))
&& invert_jump (bb_end_insn,
label_for_bb (e_fall->dest), 0))
{
e_fall->flags &= ~EDGE_FALLTHRU;
e_taken->flags |= EDGE_FALLTHRU;
@ -609,14 +611,15 @@ fixup_reorder_chain ()
/* Otherwise we can try to invert the jump. This will
basically never fail, however, keep up the pretense. */
else if (invert_jump (bb->end, label_for_bb (e_fall->dest), 0))
else if (invert_jump (bb_end_insn,
label_for_bb (e_fall->dest), 0))
{
e_fall->flags &= ~EDGE_FALLTHRU;
e_taken->flags |= EDGE_FALLTHRU;
continue;
}
}
else if (returnjump_p (bb->end))
else if (returnjump_p (bb_end_insn))
continue;
else
{
@ -629,8 +632,10 @@ fixup_reorder_chain ()
tablejump, the fallthru block should not have moved. */
if (RBI (bb)->index + 1 == RBI (e_fall->dest)->index)
continue;
#endif
bb_end_insn = skip_insns_after_block (bb);
#else
abort ();
#endif
}
}
else
@ -653,7 +658,7 @@ fixup_reorder_chain ()
{
e_fall->flags &= ~EDGE_FALLTHRU;
jump_insn = emit_jump_to_block_after (e_fall->dest, bb->end);
jump_insn = emit_jump_to_block_after (e_fall->dest, bb_end_insn);
bb->end = jump_insn;
barrier_insn = emit_barrier_after (jump_insn);
RBI (bb)->eff_end = barrier_insn;
@ -664,7 +669,7 @@ fixup_reorder_chain ()
/* We got here if we need to add a new jump insn in a new block
across the edge e_fall. */
jump_insn = emit_jump_to_block_after (e_fall->dest, bb->end);
jump_insn = emit_jump_to_block_after (e_fall->dest, bb_end_insn);
barrier_insn = emit_barrier_after (jump_insn);
VARRAY_GROW (basic_block_info, ++n_basic_blocks);