basic_block
cfg_layout_duplicate_bb (basic_block bb)
{
rtx insn;
basic_block new_bb;
insn = duplicate_insn_chain (BB_HEAD (bb), BB_END (bb));
new_bb = create_basic_block (insn,
insn ? get_last_insn () : NULL,
EXIT_BLOCK_PTR->prev_bb);
BB_COPY_PARTITION (new_bb, bb);
if (bb->il.rtl->header)
{
insn = bb->il.rtl->header;
while (NEXT_INSN (insn))
insn = NEXT_INSN (insn);
insn = duplicate_insn_chain (bb->il.rtl->header, insn);
if (insn)
new_bb->il.rtl->header = unlink_insn_chain (insn, get_last_insn ());
}
if (bb->il.rtl->footer)
{
insn = bb->il.rtl->footer;
while (NEXT_INSN (insn))
insn = NEXT_INSN (insn);
insn = duplicate_insn_chain (bb->il.rtl->footer, insn);
if (insn)
new_bb->il.rtl->footer = unlink_insn_chain (insn, get_last_insn ());
}
if (bb->il.rtl->global_live_at_start)
{
new_bb->il.rtl->global_live_at_start = ALLOC_REG_SET (®_obstack);
new_bb->il.rtl->global_live_at_end = ALLOC_REG_SET (®_obstack);
COPY_REG_SET (new_bb->il.rtl->global_live_at_start,
bb->il.rtl->global_live_at_start);
COPY_REG_SET (new_bb->il.rtl->global_live_at_end,
bb->il.rtl->global_live_at_end);
}
return new_bb;
}
static void
record_effective_endpoints (void)
{
rtx next_insn;
basic_block bb;
rtx insn;
for (insn = get_insns ();
insn
&& NOTE_P (insn)
&& NOTE_LINE_NUMBER (insn) != NOTE_INSN_BASIC_BLOCK;
insn = NEXT_INSN (insn))
continue;
/* No basic blocks at all? */
gcc_assert (insn);
if (PREV_INSN (insn))
cfg_layout_function_header =
unlink_insn_chain (get_insns (), PREV_INSN (insn));
else
cfg_layout_function_header = NULL_RTX;
next_insn = get_insns ();
FOR_EACH_BB (bb)
{
rtx end;
if (PREV_INSN (BB_HEAD (bb)) && next_insn != BB_HEAD (bb))
bb->il.rtl->header = unlink_insn_chain (next_insn,
PREV_INSN (BB_HEAD (bb)));
end = skip_insns_after_block (bb);
if (NEXT_INSN (BB_END (bb)) && BB_END (bb) != end)
bb->il.rtl->footer = unlink_insn_chain (NEXT_INSN (BB_END (bb)), end);
next_insn = NEXT_INSN (BB_END (bb));
}
cfg_layout_function_footer = next_insn;
if (cfg_layout_function_footer)
cfg_layout_function_footer = unlink_insn_chain (cfg_layout_function_footer, get_last_insn ());
}
basic_block
cfg_layout_duplicate_bb (basic_block bb, edge e)
{
rtx insn;
edge s, n;
basic_block new_bb;
gcov_type new_count = e ? e->count : 0;
if (bb->count < new_count)
new_count = bb->count;
if (!bb->pred)
abort ();
#ifdef ENABLE_CHECKING
if (!cfg_layout_can_duplicate_bb_p (bb))
abort ();
#endif
insn = duplicate_insn_chain (BB_HEAD (bb), BB_END (bb));
new_bb = create_basic_block (insn,
insn ? get_last_insn () : NULL,
EXIT_BLOCK_PTR->prev_bb);
if (bb->rbi->header)
{
insn = bb->rbi->header;
while (NEXT_INSN (insn))
insn = NEXT_INSN (insn);
insn = duplicate_insn_chain (bb->rbi->header, insn);
if (insn)
new_bb->rbi->header = unlink_insn_chain (insn, get_last_insn ());
}
if (bb->rbi->footer)
{
insn = bb->rbi->footer;
while (NEXT_INSN (insn))
insn = NEXT_INSN (insn);
insn = duplicate_insn_chain (bb->rbi->footer, insn);
if (insn)
new_bb->rbi->footer = unlink_insn_chain (insn, get_last_insn ());
}
if (bb->global_live_at_start)
{
new_bb->global_live_at_start = OBSTACK_ALLOC_REG_SET (&flow_obstack);
new_bb->global_live_at_end = OBSTACK_ALLOC_REG_SET (&flow_obstack);
COPY_REG_SET (new_bb->global_live_at_start, bb->global_live_at_start);
COPY_REG_SET (new_bb->global_live_at_end, bb->global_live_at_end);
}
new_bb->loop_depth = bb->loop_depth;
new_bb->flags = bb->flags;
for (s = bb->succ; s; s = s->succ_next)
{
/* Since we are creating edges from a new block to successors
of another block (which therefore are known to be disjoint), there
is no need to actually check for duplicated edges. */
n = unchecked_make_edge (new_bb, s->dest, s->flags);
n->probability = s->probability;
if (e && bb->count)
{
/* Take care for overflows! */
n->count = s->count * (new_count * 10000 / bb->count) / 10000;
s->count -= n->count;
}
else
n->count = s->count;
n->aux = s->aux;
}
if (e)
{
new_bb->count = new_count;
bb->count -= new_count;
new_bb->frequency = EDGE_FREQUENCY (e);
bb->frequency -= EDGE_FREQUENCY (e);
redirect_edge_and_branch_force (e, new_bb);
if (bb->count < 0)
bb->count = 0;
if (bb->frequency < 0)
bb->frequency = 0;
}
else
{
new_bb->count = bb->count;
new_bb->frequency = bb->frequency;
}
new_bb->rbi->original = bb;
bb->rbi->copy = new_bb;
return new_bb;
}
