* so modes match. A backend can safely skip all mode_b convs.
* @author Matthias Braun, Christoph Mallon
* @version $Id$
+ *
+ * After this pass the following should hold:
+ * - The only inputs with mode_b are for the Cond node or the
+ * Sel input of a Mux node.
+ * - The only nodes producing mode_b are: Proj(Cmp) and ConvB(X) (where X
+ * is some mode that can be converted to the lowered mode).
+ * ConvB will usually be implemented by a comparison with 0 producing some
+ * flags in the backends. It's debatable wether ConvB(X) is a goode idea.
+ * Maybe we should rather introduce a Test node.
+ * All other former uses should be converted to manipulations with an integer
+ * mode that was specified in the pass configuration.
*/
#include "config.h"
#include <stdlib.h>
+#include <stdbool.h>
#include "irnode_t.h"
#include "ircons_t.h"
#include "error.h"
#include "lowering.h"
#include "pdeq.h"
+#include "irpass_t.h"
static lower_mode_b_config_t config;
static ir_type *lowered_type = NULL;
ir_graph *irg;
int i, arity;
- if(get_irn_n_edges(node) != 0)
+ if (get_irn_n_edges(node) != 0)
return;
irg = get_irn_irg(node);
static ir_node *create_not(dbg_info *dbgi, ir_node *node)
{
- ir_graph *irg = current_ir_graph;
ir_node *block = get_nodes_block(node);
ir_mode *mode = config.lowered_mode;
tarval *tv_one = get_tarval_one(mode);
ir_node *one = new_d_Const(dbgi, tv_one);
- return new_rd_Eor(dbgi, irg, block, node, one, mode);
+ return new_rd_Eor(dbgi, block, node, one, mode);
}
static ir_node *create_convb(ir_node *node)
{
- ir_graph *irg = current_ir_graph;
ir_node *block = get_nodes_block(node);
- ir_node *conv = new_rd_Conv(NULL, irg, block, node, mode_b);
+ ir_node *conv = new_rd_Conv(NULL, block, node, mode_b);
return conv;
}
static ir_type *create_lowered_type(void)
{
- if(lowered_type == NULL) {
- lowered_type = new_type_primitive(new_id_from_str("__lowered_mode_b"),
- config.lowered_mode);
+ if (lowered_type == NULL) {
+ lowered_type = new_type_primitive(config.lowered_mode);
}
return lowered_type;
}
*/
static ir_node *create_set(ir_node *node)
{
- ir_graph *irg = current_ir_graph;
dbg_info *dbgi = get_irn_dbg_info(node);
ir_mode *mode = config.lowered_set_mode;
tarval *tv_one = get_tarval_one(mode);
tarval *tv_zero = get_tarval_null(mode);
ir_node *zero = new_d_Const(dbgi, tv_zero);
- ir_node *set = new_rd_Mux(dbgi, irg, block, node, zero, one, mode);
+ ir_node *set = new_rd_Mux(dbgi, block, node, zero, one, mode);
if (mode != config.lowered_mode) {
- set = new_r_Conv(irg, block, set, config.lowered_mode);
+ set = new_r_Conv(block, set, config.lowered_mode);
}
return set;
int n_res;
n_params = get_method_n_params(method_type);
- for(i = 0; i < n_params; ++i) {
+ for (i = 0; i < n_params; ++i) {
ir_type *param = get_method_param_type(method_type, i);
- if(get_type_mode(param) == mode_b) {
+ if (get_type_mode(param) == mode_b) {
set_method_param_type(method_type, i, create_lowered_type());
}
}
n_res = get_method_n_ress(method_type);
- for(i = 0; i < n_res; ++i) {
+ for (i = 0; i < n_res; ++i) {
ir_type *res_type = get_method_res_type(method_type, i);
- if(get_type_mode(res_type) == mode_b) {
+ if (get_type_mode(res_type) == mode_b) {
set_method_res_type(method_type, i, create_lowered_type());
}
}
static ir_node *lower_node(ir_node *node)
{
- ir_graph *irg = current_ir_graph;
dbg_info *dbgi = get_irn_dbg_info(node);
ir_node *block = get_nodes_block(node);
- ir_mode *mode = config.lowered_mode;
+ ir_mode *mode = config.lowered_mode;
ir_node *res;
assert(get_irn_mode(node) == mode_b);
res = get_irn_link(node);
- if(res != NULL)
+ if (res != NULL)
return res;
- /* TODO: be robust against phi-loops... */
switch (get_irn_opcode(node)) {
case iro_Phi: {
int i, arity;
arity = get_irn_arity(node);
in = ALLOCAN(ir_node*, arity);
- unknown = new_Unknown(config.lowered_mode);
- for(i = 0; i < arity; ++i) {
+ unknown = new_Unknown(mode);
+ for (i = 0; i < arity; ++i) {
in[i] = unknown;
}
- new_phi = new_r_Phi(irg, block, arity, in, config.lowered_mode);
+ new_phi = new_r_Phi(block, arity, in, mode);
set_irn_link(node, new_phi);
pdeq_putr(lowered_nodes, node);
- for(i = 0; i < arity; ++i) {
+ for (i = 0; i < arity; ++i) {
ir_node *in = get_irn_n(node, i);
ir_node *low_in = lower_node(in);
ir_node *copy = exact_copy(node);
arity = get_irn_arity(node);
- for(i = 0; i < arity; ++i) {
+ for (i = 0; i < arity; ++i) {
ir_node *in = get_irn_n(node, i);
ir_node *low_in = lower_node(in);
set_irn_n(copy, i, low_in);
}
- set_irn_mode(copy, config.lowered_mode);
+ set_irn_mode(copy, mode);
set_irn_link(node, copy);
pdeq_putr(lowered_nodes, node);
return copy;
}
+
case iro_Not: {
ir_node *op = get_Not_op(node);
ir_node *low_op = lower_node(op);
pdeq_putr(lowered_nodes, node);
return res;
}
+
case iro_Mux: {
ir_node *cond = get_Mux_sel(node);
ir_node *low_cond = lower_node(cond);
ir_node *v_false = get_Mux_false(node);
ir_node *low_v_false = lower_node(v_false);
- ir_node *and0 = new_rd_And(dbgi, irg, block, low_cond, low_v_true, mode);
+ ir_node *and0 = new_rd_And(dbgi, block, low_cond, low_v_true, mode);
ir_node *not_cond = create_not(dbgi, low_cond);
- ir_node *and1 = new_rd_And(dbgi, irg, block, not_cond, low_v_false, mode);
- ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1, mode);
+ ir_node *and1 = new_rd_And(dbgi, block, not_cond, low_v_false, mode);
+ ir_node *or = new_rd_Or(dbgi, block, and0, and1, mode);
set_irn_link(node, or);
pdeq_putr(lowered_nodes, node);
return or;
}
+
case iro_Conv: {
ir_node *pred = get_Conv_op(node);
ir_mode *mode = get_irn_mode(pred);
ir_node *zero_cmp = new_d_Const(dbgi, tv_zeroc);
ir_node *set;
- ir_node *cmp = new_rd_Cmp(dbgi, irg, block, pred, zero_cmp);
- ir_node *proj = new_rd_Proj(dbgi, irg, block, cmp, mode_b,
- pn_Cmp_Lg);
+ ir_node *cmp = new_rd_Cmp(dbgi, block, pred, zero_cmp);
+ ir_node *proj = new_rd_Proj(dbgi, block, cmp, mode_b, pn_Cmp_Lg);
set = create_set(proj);
set_irn_link(node, set);
pdeq_putr(lowered_nodes, node);
return set;
}
+
case iro_Proj: {
ir_node *pred = get_Proj_pred(node);
- if(is_Cmp(pred)) {
+ if (is_Cmp(pred)) {
ir_node *left = get_Cmp_left(pred);
ir_node *right = get_Cmp_right(pred);
ir_mode *cmp_mode = get_irn_mode(left);
ir_node *a = NULL;
ir_node *b = NULL;
- if(pnc == pn_Cmp_Lt) {
+ if (pnc == pn_Cmp_Lt) {
/* a < b -> (a - b) >> 31 */
a = left;
b = right;
- } else if(pnc == pn_Cmp_Le) {
+ } else if (pnc == pn_Cmp_Le) {
/* a <= b -> ~(a - b) >> 31 */
a = right;
b = left;
need_not = 1;
- } else if(pnc == pn_Cmp_Gt) {
+ } else if (pnc == pn_Cmp_Gt) {
/* a > b -> (b - a) >> 31 */
a = right;
b = left;
- } else if(pnc == pn_Cmp_Ge) {
+ } else if (pnc == pn_Cmp_Ge) {
/* a >= b -> ~(a - b) >> 31 */
a = left;
b = right;
need_not = 1;
}
- if(a != NULL) {
+ if (a != NULL) {
int bits = get_mode_size_bits(mode);
tarval *tv = new_tarval_from_long(bits-1, mode_Iu);
ir_node *shift_cnt = new_d_Const(dbgi, tv);
- if(cmp_mode != mode) {
- a = new_rd_Conv(dbgi, irg, block, a, mode);
- b = new_rd_Conv(dbgi, irg, block, b, mode);
+ if (cmp_mode != mode) {
+ a = new_rd_Conv(dbgi, block, a, mode);
+ b = new_rd_Conv(dbgi, block, b, mode);
}
- res = new_rd_Sub(dbgi, irg, block, a, b, mode);
- if(need_not) {
- res = new_rd_Not(dbgi, irg, block, res, mode);
+ res = new_rd_Sub(dbgi, block, a, b, mode);
+ if (need_not) {
+ res = new_rd_Not(dbgi, block, res, mode);
}
- res = new_rd_Shr(dbgi, irg, block, res, shift_cnt, mode);
+ res = new_rd_Shr(dbgi, block, res, shift_cnt, mode);
set_irn_link(node, res);
pdeq_putr(lowered_nodes, node);
set_irn_link(node, set);
pdeq_putr(lowered_nodes, node);
return set;
- } else if(is_Proj(pred) && is_Call(get_Proj_pred(pred))) {
+ } else if (is_Proj(pred) && is_Call(get_Proj_pred(pred))) {
ir_type *type = get_Call_type(get_Proj_pred(pred));
adjust_method_type(type);
set_irn_mode(node, mode);
return node;
- } else if(is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
- ir_entity *entity = get_irg_entity(irg);
+ } else if (is_Proj(pred) && is_Start(get_Proj_pred(pred))) {
+ ir_entity *entity = get_irg_entity(current_ir_graph);
ir_type *type = get_entity_type(entity);
adjust_method_type(type);
set_irn_mode(node, mode);
panic("unexpected projb: %+F (pred: %+F)", node, pred);
}
+
case iro_Const: {
tarval *tv = get_Const_tarval(node);
- if(tv == get_tarval_b_true()) {
+ if (tv == get_tarval_b_true()) {
tarval *tv_one = get_tarval_one(mode);
res = new_d_Const(dbgi, tv_one);
- } else if(tv == get_tarval_b_false()) {
+ } else if (tv == get_tarval_b_false()) {
tarval *tv_zero = get_tarval_null(mode);
res = new_d_Const(dbgi, tv_zero);
} else {
pdeq_putr(lowered_nodes, node);
return res;
}
+
case iro_Unknown:
- return new_Unknown(config.lowered_mode);
+ return new_Unknown(mode);
+
default:
panic("didn't expect %+F to have mode_b", node);
}
static void lower_mode_b_walker(ir_node *node, void *env)
{
int i, arity;
- int changed = 0;
+ bool changed = 0;
(void) env;
arity = get_irn_arity(node);
- for(i = 0; i < arity; ++i) {
+ for (i = 0; i < arity; ++i) {
ir_node *lowered_in;
ir_node *in = get_irn_n(node, i);
- if(get_irn_mode(in) != mode_b)
+ if (get_irn_mode(in) != mode_b)
continue;
- if(! config.lower_direct_cmp) {
+ if (! config.lower_direct_cmp) {
+ /* Proj(Cmp) as input for Cond and Mux nodes needs no changes.
+ (Mux with mode_b is an exception as it gets replaced by and/or
+ anyway so we still lower the inputs then) */
if (is_Cond(node) ||
(is_Mux(node) && get_irn_mode(node) != mode_b)) {
- if(is_Proj(in)) {
+ if (is_Proj(in)) {
ir_node *pred = get_Proj_pred(in);
- if(is_Cmp(pred))
+ if (is_Cmp(pred))
continue;
}
}
lowered_in = lower_node(in);
- if(is_Return(node)) {
- ir_entity *entity = get_irg_entity(current_ir_graph);
- ir_type *type = get_entity_type(entity);
- adjust_method_type(type);
- } else if(is_Call(node)) {
+ if (is_Call(node)) {
ir_type *type = get_Call_type(node);
adjust_method_type(type);
- } else {
+ } else if (is_Cond(node) || (is_Mux(node) && i == 0)) {
lowered_in = create_convb(lowered_in);
}
set_irn_n(node, i, lowered_in);
- changed = 1;
+ changed = true;
}
- if(changed) {
+ if (changed) {
add_identities(current_ir_graph->value_table, node);
}
}
-static void clear_links(ir_node *node, void *env)
-{
- (void) env;
- set_irn_link(node, NULL);
-}
-
void ir_lower_mode_b(ir_graph *irg, const lower_mode_b_config_t *nconfig)
{
+ ir_entity *entity = get_irg_entity(irg);
+ ir_type *type = get_entity_type(entity);
+
config = *nconfig;
lowered_nodes = new_pdeq();
+ lowered_type = NULL;
+
+ /* ensure no optimisation touches muxes anymore */
+ set_irg_state(irg, IR_GRAPH_STATE_KEEP_MUX);
ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK);
+ adjust_method_type(type);
+
set_opt_allow_conv_b(0);
- irg_walk_graph(irg, clear_links, NULL, NULL);
+ irg_walk_graph(irg, firm_clear_link, NULL, NULL);
irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL);
while(!pdeq_empty(lowered_nodes)) {
ir_free_resources(irg, IR_RESOURCE_IRN_LINK);
}
+
+struct pass_t {
+ ir_graph_pass_t pass;
+ const lower_mode_b_config_t *config;
+};
+
+/**
+ * Wrapper to run ir_lower_mode_b() as an ir_graph pass
+ */
+static int pass_wrapper(ir_graph *irg, void *context)
+{
+ struct pass_t *pass = context;
+
+ ir_lower_mode_b(irg, pass->config);
+ return 0;
+}
+
+ir_graph_pass_t *ir_lower_mode_b_pass(
+ const char *name, const lower_mode_b_config_t *config)
+{
+ struct pass_t *pass = XMALLOCZ(struct pass_t);
+
+ pass->config = config;
+ return def_graph_pass_constructor(
+ &pass->pass, name ? name : "lower_mode_b", pass_wrapper);
+}
projects / libfirm / blobdiff