/* Create clone of E in the node N represented by CALL_EXPR the callgraph. */
struct cgraph_edge *
cgraph_clone_edge (struct cgraph_edge *e, struct cgraph_node *n,
gimple call_stmt, unsigned stmt_uid, gcov_type count_scale,
int freq_scale, bool update_original)
{
struct cgraph_edge *new_edge;
gcov_type count = apply_probability (e->count, count_scale);
gcov_type freq;
/* We do not want to ignore loop nest after frequency drops to 0. */
if (!freq_scale)
freq_scale = 1;
freq = e->frequency * (gcov_type) freq_scale / CGRAPH_FREQ_BASE;
if (freq > CGRAPH_FREQ_MAX)
freq = CGRAPH_FREQ_MAX;
if (e->indirect_unknown_callee)
{
tree decl;
if (call_stmt && (decl = gimple_call_fndecl (call_stmt)))
{
struct cgraph_node *callee = cgraph_get_node (decl);
gcc_checking_assert (callee);
new_edge = cgraph_create_edge (n, callee, call_stmt, count, freq);
}
else
{
new_edge = cgraph_create_indirect_edge (n, call_stmt,
e->indirect_info->ecf_flags,
count, freq);
*new_edge->indirect_info = *e->indirect_info;
}
}
else
{
new_edge = cgraph_create_edge (n, e->callee, call_stmt, count, freq);
if (e->indirect_info)
{
new_edge->indirect_info
= ggc_alloc_cleared_cgraph_indirect_call_info ();
*new_edge->indirect_info = *e->indirect_info;
}
}
new_edge->inline_failed = e->inline_failed;
new_edge->indirect_inlining_edge = e->indirect_inlining_edge;
new_edge->lto_stmt_uid = stmt_uid;
/* Clone flags that depend on call_stmt availability manually. */
new_edge->can_throw_external = e->can_throw_external;
new_edge->call_stmt_cannot_inline_p = e->call_stmt_cannot_inline_p;
if (update_original)
{
e->count -= new_edge->count;
if (e->count < 0)
e->count = 0;
}
cgraph_call_edge_duplication_hooks (e, new_edge);
return new_edge;
}
static bool
shrink_wrap_one_built_in_call (gimple bi_call)
{
gimple_stmt_iterator bi_call_bsi;
basic_block bi_call_bb, join_tgt_bb, guard_bb, guard_bb0;
edge join_tgt_in_edge_from_call, join_tgt_in_edge_fall_thru;
edge bi_call_in_edge0, guard_bb_in_edge;
unsigned tn_cond_stmts, nconds;
unsigned ci;
gimple cond_expr = NULL;
gimple cond_expr_start;
tree bi_call_label_decl;
gimple bi_call_label;
auto_vec<gimple, 12> conds;
gen_shrink_wrap_conditions (bi_call, conds, &nconds);
/* This can happen if the condition generator decides
it is not beneficial to do the transformation. Just
return false and do not do any transformation for
the call. */
if (nconds == 0)
return false;
bi_call_bb = gimple_bb (bi_call);
/* Now find the join target bb -- split bi_call_bb if needed. */
if (stmt_ends_bb_p (bi_call))
{
/* If the call must be the last in the bb, don't split the block,
it could e.g. have EH edges. */
join_tgt_in_edge_from_call = find_fallthru_edge (bi_call_bb->succs);
if (join_tgt_in_edge_from_call == NULL)
return false;
}
else
join_tgt_in_edge_from_call = split_block (bi_call_bb, bi_call);
bi_call_bsi = gsi_for_stmt (bi_call);
join_tgt_bb = join_tgt_in_edge_from_call->dest;
/* Now it is time to insert the first conditional expression
into bi_call_bb and split this bb so that bi_call is
shrink-wrapped. */
tn_cond_stmts = conds.length ();
cond_expr = NULL;
cond_expr_start = conds[0];
for (ci = 0; ci < tn_cond_stmts; ci++)
{
gimple c = conds[ci];
gcc_assert (c || ci != 0);
if (!c)
break;
gsi_insert_before (&bi_call_bsi, c, GSI_SAME_STMT);
cond_expr = c;
}
nconds--;
ci++;
gcc_assert (cond_expr && gimple_code (cond_expr) == GIMPLE_COND);
/* Now the label. */
bi_call_label_decl = create_artificial_label (gimple_location (bi_call));
bi_call_label = gimple_build_label (bi_call_label_decl);
gsi_insert_before (&bi_call_bsi, bi_call_label, GSI_SAME_STMT);
bi_call_in_edge0 = split_block (bi_call_bb, cond_expr);
bi_call_in_edge0->flags &= ~EDGE_FALLTHRU;
bi_call_in_edge0->flags |= EDGE_TRUE_VALUE;
guard_bb0 = bi_call_bb;
bi_call_bb = bi_call_in_edge0->dest;
join_tgt_in_edge_fall_thru = make_edge (guard_bb0, join_tgt_bb,
EDGE_FALSE_VALUE);
bi_call_in_edge0->probability = REG_BR_PROB_BASE * ERR_PROB;
bi_call_in_edge0->count =
apply_probability (guard_bb0->count,
bi_call_in_edge0->probability);
join_tgt_in_edge_fall_thru->probability =
inverse_probability (bi_call_in_edge0->probability);
join_tgt_in_edge_fall_thru->count =
guard_bb0->count - bi_call_in_edge0->count;
/* Code generation for the rest of the conditions */
guard_bb = guard_bb0;
while (nconds > 0)
{
unsigned ci0;
edge bi_call_in_edge;
gimple_stmt_iterator guard_bsi = gsi_for_stmt (cond_expr_start);
ci0 = ci;
cond_expr_start = conds[ci0];
for (; ci < tn_cond_stmts; ci++)
{
gimple c = conds[ci];
gcc_assert (c || ci != ci0);
if (!c)
break;
gsi_insert_before (&guard_bsi, c, GSI_SAME_STMT);
cond_expr = c;
}
nconds--;
ci++;
gcc_assert (cond_expr && gimple_code (cond_expr) == GIMPLE_COND);
guard_bb_in_edge = split_block (guard_bb, cond_expr);
guard_bb_in_edge->flags &= ~EDGE_FALLTHRU;
guard_bb_in_edge->flags |= EDGE_FALSE_VALUE;
bi_call_in_edge = make_edge (guard_bb, bi_call_bb, EDGE_TRUE_VALUE);
bi_call_in_edge->probability = REG_BR_PROB_BASE * ERR_PROB;
bi_call_in_edge->count =
apply_probability (guard_bb->count,
bi_call_in_edge->probability);
guard_bb_in_edge->probability =
inverse_probability (bi_call_in_edge->probability);
guard_bb_in_edge->count = guard_bb->count - bi_call_in_edge->count;
}
if (dump_file && (dump_flags & TDF_DETAILS))
{
location_t loc;
loc = gimple_location (bi_call);
fprintf (dump_file,
"%s:%d: note: function call is shrink-wrapped"
" into error conditions.\n",
LOCATION_FILE (loc), LOCATION_LINE (loc));
}
return true;
}
static struct loop *
unswitch_loop (struct loop *loop, basic_block unswitch_on, rtx cond, rtx cinsn)
{
edge entry, latch_edge, true_edge, false_edge, e;
basic_block switch_bb, unswitch_on_alt;
struct loop *nloop;
int irred_flag, prob;
rtx seq;
/* Some sanity checking. */
gcc_assert (flow_bb_inside_loop_p (loop, unswitch_on));
gcc_assert (EDGE_COUNT (unswitch_on->succs) == 2);
gcc_assert (just_once_each_iteration_p (loop, unswitch_on));
gcc_assert (!loop->inner);
gcc_assert (flow_bb_inside_loop_p (loop, EDGE_SUCC (unswitch_on, 0)->dest));
gcc_assert (flow_bb_inside_loop_p (loop, EDGE_SUCC (unswitch_on, 1)->dest));
entry = loop_preheader_edge (loop);
/* Make a copy. */
irred_flag = entry->flags & EDGE_IRREDUCIBLE_LOOP;
entry->flags &= ~EDGE_IRREDUCIBLE_LOOP;
if (!duplicate_loop_to_header_edge (loop, entry, 1,
NULL, NULL, NULL, 0))
return NULL;
entry->flags |= irred_flag;
/* Record the block with condition we unswitch on. */
unswitch_on_alt = get_bb_copy (unswitch_on);
true_edge = BRANCH_EDGE (unswitch_on_alt);
false_edge = FALLTHRU_EDGE (unswitch_on);
latch_edge = single_succ_edge (get_bb_copy (loop->latch));
/* Create a block with the condition. */
prob = true_edge->probability;
switch_bb = create_empty_bb (EXIT_BLOCK_PTR->prev_bb);
seq = compare_and_jump_seq (XEXP (cond, 0), XEXP (cond, 1), GET_CODE (cond),
block_label (true_edge->dest),
prob, cinsn);
emit_insn_after (seq, BB_END (switch_bb));
e = make_edge (switch_bb, true_edge->dest, 0);
e->probability = prob;
e->count = apply_probability (latch_edge->count, prob);
e = make_edge (switch_bb, FALLTHRU_EDGE (unswitch_on)->dest, EDGE_FALLTHRU);
e->probability = false_edge->probability;
e->count = apply_probability (latch_edge->count, false_edge->probability);
if (irred_flag)
{
switch_bb->flags |= BB_IRREDUCIBLE_LOOP;
EDGE_SUCC (switch_bb, 0)->flags |= EDGE_IRREDUCIBLE_LOOP;
EDGE_SUCC (switch_bb, 1)->flags |= EDGE_IRREDUCIBLE_LOOP;
}
else
{
switch_bb->flags &= ~BB_IRREDUCIBLE_LOOP;
EDGE_SUCC (switch_bb, 0)->flags &= ~EDGE_IRREDUCIBLE_LOOP;
EDGE_SUCC (switch_bb, 1)->flags &= ~EDGE_IRREDUCIBLE_LOOP;
}
/* Loopify from the copy of LOOP body, constructing the new loop. */
nloop = loopify (latch_edge,
single_pred_edge (get_bb_copy (loop->header)), switch_bb,
BRANCH_EDGE (switch_bb), FALLTHRU_EDGE (switch_bb), true,
prob, REG_BR_PROB_BASE - prob);
copy_loop_info (loop, nloop);
/* Remove branches that are now unreachable in new loops. */
remove_path (true_edge);
remove_path (false_edge);
/* Preserve the simple loop preheaders. */
split_edge (loop_preheader_edge (loop));
split_edge (loop_preheader_edge (nloop));
return nloop;
}
