X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Flower%2Flower_mode_b.c;h=8cee5966518993fe0b71ea28989c7bbe7375fe40;hb=0f234e2d94155d13c0e4727871125beda0eaa66d;hp=e16a6f3066bcccc64c4097d353b614c28d780b10;hpb=c974948b59add3989745dafda733addf972fcdad;p=libfirm diff --git a/ir/lower/lower_mode_b.c b/ir/lower/lower_mode_b.c index e16a6f306..8cee59665 100644 --- a/ir/lower/lower_mode_b.c +++ b/ir/lower/lower_mode_b.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved. + * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved. * * This file is part of libFirm. * @@ -19,17 +19,32 @@ /** * @file + * @brief lowers operations with mode_b. The result is a graph which + * might still contains some convs from/to mode_b, but no + * operations are performed on them anymore, they are just there + * 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. */ -#ifdef HAVE_CONFIG_H #include "config.h" -#endif #include +#include #include "irnode_t.h" #include "ircons_t.h" +#include "irflag.h" #include "irgwalk.h" #include "irtools.h" #include "iredges.h" @@ -38,11 +53,11 @@ #include "error.h" #include "lowering.h" #include "pdeq.h" +#include "irpass_t.h" -static ir_mode *lowered_mode = NULL; -static int lower_direct_cmp = 0; -static ir_type *lowered_type = NULL; -static pdeq *lowered_nodes = NULL; +static lower_mode_b_config_t config; +static ir_type *lowered_type = NULL; +static pdeq *lowered_nodes = NULL; /** * Removes a node if its out-edge count has reached 0. @@ -53,7 +68,7 @@ static void maybe_kill_node(ir_node *node) 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); @@ -71,32 +86,52 @@ static void maybe_kill_node(ir_node *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); - tarval *tv_one = get_tarval_one(lowered_mode); - ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one); + 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, lowered_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"), - lowered_mode); + if (lowered_type == NULL) { + lowered_type = new_type_primitive(config.lowered_mode); } return lowered_type; } +/** + * creates a "set" node that produces a 0 or 1 based on a Cmp result + */ +static ir_node *create_set(ir_node *node) +{ + dbg_info *dbgi = get_irn_dbg_info(node); + ir_mode *mode = config.lowered_set_mode; + tarval *tv_one = get_tarval_one(mode); + ir_node *one = new_d_Const(dbgi, tv_one); + ir_node *block = get_nodes_block(node); + tarval *tv_zero = get_tarval_null(mode); + ir_node *zero = new_d_Const(dbgi, tv_zero); + + ir_node *set = new_rd_Mux(dbgi, block, node, zero, one, mode); + + if (mode != config.lowered_mode) { + set = new_r_Conv(block, set, config.lowered_mode); + } + + return set; +} + static void adjust_method_type(ir_type *method_type) { int i; @@ -104,17 +139,17 @@ static void adjust_method_type(ir_type *method_type) 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()); } } @@ -122,36 +157,38 @@ static void adjust_method_type(ir_type *method_type) static ir_node *lower_node(ir_node *node) { - ir_graph *irg = current_ir_graph; dbg_info *dbgi = get_irn_dbg_info(node); - ir_op *op = get_irn_op(node); ir_node *block = get_nodes_block(node); + 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... */ - if(op == op_Phi) { + assert(get_irn_mode(node) == mode_b); + + switch (get_irn_opcode(node)) { + case iro_Phi: { int i, arity; ir_node **in; ir_node *unknown, *new_phi; - arity = get_irn_arity(node); - in = alloca(arity * sizeof(in[0])); - unknown = new_Unknown(lowered_mode); - for(i = 0; i < arity; ++i) { + arity = get_irn_arity(node); + in = ALLOCAN(ir_node*, arity); + unknown = new_Unknown(mode); + for (i = 0; i < arity; ++i) { in[i] = unknown; } - new_phi = new_rd_Phi(dbgi, irg, block, arity, in, - lowered_mode); + new_phi = new_r_Phi(block, arity, in, mode); + /* FIXME This does not correctly break cycles: The Phi might not be the + * first in the recursion, so the caller(s) are some yet un-lowered nodes + * and this Phi might have them (indirectly) as operands, so they would be + * replaced twice. */ 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); @@ -161,203 +198,187 @@ static ir_node *lower_node(ir_node *node) return new_phi; } - if(op == op_And || op == op_Or || op == op_Eor) { + case iro_And: + case iro_Or: + case iro_Eor: { int i, arity; - ir_node *copy = exact_copy(node); + res = 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_n(res, i, low_in); } - set_irn_mode(copy, lowered_mode); - - set_irn_link(node, copy); - pdeq_putr(lowered_nodes, node); - return copy; + set_irn_mode(res, mode); + break; } - if(op == op_Not) { + + case iro_Not: { ir_node *op = get_Not_op(node); ir_node *low_op = lower_node(op); res = create_not(dbgi, low_op); - set_irn_link(node, res); - pdeq_putr(lowered_nodes, node); - return res; + break; } - if(op == op_Psi) { - ir_node *cond = get_Psi_cond(node, 0); + + case iro_Mux: { + ir_node *cond = get_Mux_sel(node); ir_node *low_cond = lower_node(cond); - ir_node *v_true = get_Psi_val(node, 0); + ir_node *v_true = get_Mux_true(node); ir_node *low_v_true = lower_node(v_true); - ir_node *v_false = get_Psi_default(node); + 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, - lowered_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, - lowered_mode); - - ir_node *or = new_rd_Or(dbgi, irg, block, and0, and1, - lowered_mode); - - set_irn_link(node, or); - pdeq_putr(lowered_nodes, node); - return or; + ir_node *and1 = new_rd_And(dbgi, block, not_cond, low_v_false, mode); + res = new_rd_Or(dbgi, block, and0, and1, mode); + break; } - if(op == op_Conv) { - tarval *tv_one = get_tarval_one(lowered_mode); - ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one); - tarval *tv_zero = get_tarval_null(lowered_mode); - ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero); + + case iro_Conv: { ir_node *pred = get_Conv_op(node); ir_mode *mode = get_irn_mode(pred); tarval *tv_zeroc = get_tarval_null(mode); - ir_node *zero_cmp = new_d_Const(dbgi, mode, tv_zeroc); - - 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 *vals[2] = { one, zero }; - ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &proj, vals, - lowered_mode); + ir_node *zero_cmp = new_d_Const(dbgi, tv_zeroc); - set_irn_link(node, psi); - pdeq_putr(lowered_nodes, node); - return psi; + 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); + res = create_set(proj); + break; } - if(op == op_Proj) { + + 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 *mode = get_irn_mode(left); + ir_mode *cmp_mode = get_irn_mode(left); - if ((mode_is_int(mode) || mode_is_reference(mode)) && ( - get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode) || - (mode_is_signed(mode) && is_Const(right) && is_Const_null(right)) - )) { + if ((mode_is_int(cmp_mode) || mode_is_reference(cmp_mode)) && + (get_mode_size_bits(cmp_mode) < get_mode_size_bits(mode) || + (mode_is_signed(cmp_mode) && is_Const(right) && is_Const_null(right)))) { int pnc = get_Proj_proj(node); int need_not = 0; ir_node *a = NULL; ir_node *b = NULL; + int bits; + tarval *tv; + ir_node *shift_cnt; - 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; + } else { + goto synth_zero_one; } - if(a != NULL) { - tarval *tv = new_tarval_from_long(get_mode_size_bits(lowered_mode) - 1, mode_Iu); - ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv); - - if(mode != lowered_mode) { - a = new_rd_Conv(dbgi, irg, block, a, lowered_mode); - b = new_rd_Conv(dbgi, irg, block, b, lowered_mode); - } - - res = new_rd_Sub(dbgi, irg, block, a, b, lowered_mode); - if(need_not) { - res = new_rd_Not(dbgi, irg, block, res, lowered_mode); - } - res = new_rd_Shr(dbgi, irg, block, res, shift_cnt, - lowered_mode); - - set_irn_link(node, res); - pdeq_putr(lowered_nodes, node); - return res; - } - } + bits = get_mode_size_bits(mode); + tv = new_tarval_from_long(bits-1, mode_Iu); + shift_cnt = new_d_Const(dbgi, tv); - { - /* synthesize the 0/1 value */ - tarval *tv_one = get_tarval_one(lowered_mode); - ir_node *one = new_d_Const(dbgi, lowered_mode, tv_one); - tarval *tv_zero = get_tarval_null(lowered_mode); - ir_node *zero = new_d_Const(dbgi, lowered_mode, tv_zero); - - ir_node *vals[2] = { one, zero }; - ir_node *psi = new_rd_Psi(dbgi, irg, block, 1, &node, vals, - lowered_mode); + if (cmp_mode != mode) { + a = new_rd_Conv(dbgi, block, a, mode); + b = new_rd_Conv(dbgi, block, b, mode); + } - set_irn_link(node, psi); - pdeq_putr(lowered_nodes, node); - return psi; + 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, block, res, shift_cnt, mode); + } else { + /* synthesize the 0/1 value */ +synth_zero_one: + res = create_set(node); } - } 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, lowered_mode); - return node; - } else if(is_Proj(pred) && is_Start(get_Proj_pred(pred))) { - ir_entity *entity = get_irg_entity(irg); + set_irn_mode(node, mode); + res = node; + goto own_replacement; + } 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, lowered_mode); - return node; + set_irn_mode(node, mode); + res = node; + goto own_replacement; + } else { + panic("unexpected projb: %+F (pred: %+F)", node, pred); } - - panic("unexpected projb: %+F (pred: %+F)", node, pred); + break; } - if(op == op_Const) { + + case iro_Const: { tarval *tv = get_Const_tarval(node); - if(tv == get_tarval_b_true()) { - tarval *tv_one = get_tarval_one(lowered_mode); - res = new_d_Const(dbgi, lowered_mode, tv_one); - } else if(tv == get_tarval_b_false()) { - tarval *tv_zero = get_tarval_null(lowered_mode); - res = new_d_Const(dbgi, lowered_mode, tv_zero); + 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()) { + tarval *tv_zero = get_tarval_null(mode); + res = new_d_Const(dbgi, tv_zero); } else { panic("invalid boolean const %+F", node); } - set_irn_link(node, res); - pdeq_putr(lowered_nodes, node); - return res; + break; + } + + case iro_Unknown: + res = new_Unknown(mode); + break; + + default: + panic("didn't expect %+F to have mode_b", node); } - panic("didn't expect %+F to have mode_b", node); + pdeq_putr(lowered_nodes, node); +own_replacement: + set_irn_link(node, res); + return res; } 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(! lower_direct_cmp) { - if(is_Cond(node) - || (is_Psi(node) && get_irn_mode(node) != mode_b)) { - if(is_Proj(in)) { + 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)) { ir_node *pred = get_Proj_pred(in); - if(is_Cmp(pred)) + if (is_Cmp(pred)) continue; } } @@ -365,38 +386,38 @@ static void lower_mode_b_walker(ir_node *node, void *env) 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 ir_lower_mode_b(ir_graph *irg, const lower_mode_b_config_t *nconfig) { - (void) env; - set_irn_link(node, NULL); -} + ir_entity *entity = get_irg_entity(irg); + ir_type *type = get_entity_type(entity); -void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp) -{ - lowered_mode = mode; - lower_direct_cmp = do_lower_direct_cmp; - lowered_nodes = new_pdeq(); - set_using_irn_link(irg); + 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); - irg_walk_graph(irg, clear_links, NULL, NULL); + adjust_method_type(type); + + set_opt_allow_conv_b(0); + irg_walk_graph(irg, firm_clear_link, NULL, NULL); irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL); while(!pdeq_empty(lowered_nodes)) { @@ -405,5 +426,31 @@ void ir_lower_mode_b(ir_graph *irg, ir_mode *mode, int do_lower_direct_cmp) } del_pdeq(lowered_nodes); - clear_using_irn_link(irg); + 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); }