X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Flower%2Flower_mode_b.c;h=6a381be801bc931f30c0e468e3c7635d05dde736;hb=fedd1b41af2db9492f9b9d0626b6db560288a63e;hp=dfd502c96962b2845b621b007092658ef1619ea9;hpb=26978503af473670da1864c6549073641baff0ed;p=libfirm diff --git a/ir/lower/lower_mode_b.c b/ir/lower/lower_mode_b.c index dfd502c96..6a381be80 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) 1995-2011 University of Karlsruhe. All right reserved. * * This file is part of libFirm. * @@ -19,286 +19,447 @@ /** * @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 whether ConvB(X) is a good 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" +#include "iropt_t.h" +#include "irgmod.h" #include "tv.h" #include "error.h" #include "lowering.h" +#include "pdeq.h" +#include "irpass_t.h" +#include "util.h" +#include "array.h" + +static const lower_mode_b_config_t *config; +static ir_type *lowered_type; +static ir_node **lowered_nodes; +static ir_node **check_later; -static ir_mode *lowered_mode = NULL; -static int lower_direct_cmp = 0; +/** + * Removes a node if its out-edge count has reached 0. + * temporary hack until we have proper automatic dead code elimination. + */ +static void maybe_kill_node(ir_node *node) +{ + if (get_irn_n_edges(node) != 0) + return; + + kill_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_node *block = get_nodes_block(node); + ir_mode *mode = config->lowered_mode; + ir_tarval *tv_one = get_mode_one(mode); + ir_graph *irg = get_irn_irg(node); + ir_node *one = new_rd_Const(dbgi, irg, tv_one); + + return new_rd_Eor(dbgi, block, node, one, mode); +} + +static ir_node *create_convb(ir_node *node) +{ + ir_node *block = get_nodes_block(node); + 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(config->lowered_mode); + } + return lowered_type; +} + +ir_node *ir_create_mux_set(ir_node *cond, ir_mode *dest_mode) +{ + ir_graph *irg = get_irn_irg(cond); + ir_node *block = get_nodes_block(cond); + ir_tarval *tv_one = get_mode_one(dest_mode); + ir_node *one = new_r_Const(irg, tv_one); + ir_tarval *tv_zero = get_mode_null(dest_mode); + ir_node *zero = new_r_Const(irg, tv_zero); + ir_node *set = new_r_Mux(block, cond, zero, one, dest_mode); + return set; +} - return new_rd_Eor(dbgi, irg, block, node, one, lowered_mode); +ir_node *ir_create_cond_set(ir_node *cond_value, ir_mode *dest_mode) +{ + ir_node *lower_block = part_block_edges(cond_value); + ir_node *upper_block = get_nodes_block(cond_value); + ir_graph *irg = get_irn_irg(cond_value); + ir_node *cond = new_r_Cond(upper_block, cond_value); + ir_node *proj_true = new_r_Proj(cond, mode_X, pn_Cond_true); + ir_node *proj_false = new_r_Proj(cond, mode_X, pn_Cond_false); + ir_node *in_true[1] = { proj_true }; + ir_node *in_false[1] = { proj_false }; + ir_node *true_block = new_r_Block(irg, ARRAY_SIZE(in_true), in_true); + ir_node *false_block = new_r_Block(irg, ARRAY_SIZE(in_false),in_false); + ir_node *true_jmp = new_r_Jmp(true_block); + ir_node *false_jmp = new_r_Jmp(false_block); + ir_node *lower_in[2] = { true_jmp, false_jmp }; + ir_node *one = new_r_Const(irg, get_mode_one(dest_mode)); + ir_node *zero = new_r_Const(irg, get_mode_null(dest_mode)); + ir_node *phi_in[2] = { one, zero }; + ir_node *phi; + + set_irn_in(lower_block, ARRAY_SIZE(lower_in), lower_in); + phi = new_r_Phi(lower_block, ARRAY_SIZE(phi_in), phi_in, dest_mode); + + /* make sure we do visit the cond_value later... */ + ARR_APP1(ir_node*, check_later, cond_value); + + return phi; +} + +static void adjust_method_type(ir_type *method_type) +{ + size_t i; + size_t n_params; + size_t n_res; + + n_params = get_method_n_params(method_type); + for (i = 0; i < n_params; ++i) { + ir_type *param = get_method_param_type(method_type, i); + 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) { + ir_type *res_type = get_method_res_type(method_type, i); + 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_op *op = get_irn_op(node); ir_node *block = get_nodes_block(node); - ir_node *res; - - assert(get_irn_mode(node) == mode_b); + ir_mode *mode = config->lowered_mode; + ir_node *res = (ir_node*)get_irn_link(node); + ir_graph *irg; - res = get_irn_link(node); - if(res != NULL) + if (res != NULL) return res; - /* TODO: be robust against phi-loops... */ - if(op == op_Phi) { + node = skip_Tuple(node); + + assert(get_irn_mode(node) == mode_b); + + irg = get_irn_irg(node); + switch (get_irn_opcode(node)) { + case iro_Phi: { int i, arity; ir_node **in; - ir_node *unknown; + ir_node *dummy; + ir_node *new_phi; arity = get_irn_arity(node); - in = alloca(arity * sizeof(in[0])); - unknown = new_Unknown(lowered_mode); - for(i = 0; i < arity; ++i) { - in[i] = unknown; + in = ALLOCAN(ir_node*, arity); + dummy = new_r_Dummy(irg, mode); + for (i = 0; i < arity; ++i) { + in[i] = dummy; } - ir_node *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); + ARR_APP1(ir_node*, lowered_nodes, node); - for(i = 0; i < arity; ++i) { - ir_node *in = get_irn_n(node, i); - ir_node *low_in = lower_node(in); + for (i = 0; i < arity; ++i) { + ir_node *in = get_irn_n(node, i); + ir_node *lowered_in = is_Bad(in) ? in : lower_node(in); - set_irn_n(new_phi, i, low_in); + set_irn_n(new_phi, i, lowered_in); } return new_phi; } - if(op == op_And || op == op_Or || op == op_Eor) { - int i, arity; - ir_node *copy = exact_copy(node); - - arity = get_irn_arity(node); - 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, lowered_mode); - - set_irn_link(node, copy); - return copy; + case iro_And: { + ir_node *lowered_left = lower_node(get_And_left(node)); + ir_node *lowered_right = lower_node(get_And_right(node)); + res = new_rd_And(dbgi, block, lowered_left, lowered_right, mode); + break; + } + case iro_Or: { + ir_node *lowered_left = lower_node(get_Or_left(node)); + ir_node *lowered_right = lower_node(get_Or_right(node)); + res = new_rd_Or(dbgi, block, lowered_left, lowered_right, mode); + break; + } + case iro_Eor: { + ir_node *lowered_left = lower_node(get_Eor_left(node)); + ir_node *lowered_right = lower_node(get_Eor_right(node)); + res = new_rd_Eor(dbgi, block, lowered_left, lowered_right, 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); - 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, 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); - return or; - } - 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); - ir_mode *mode = get_irn_mode(node); - 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, node, 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); - - set_irn_link(node, psi); - return psi; + 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_Proj) { - ir_node *pred = get_Proj_pred(node); - - assert(!is_Load(pred)); - if(is_Cmp(pred)) { - ir_mode *mode = get_irn_mode(pred); - ir_node *left = get_Cmp_left(pred); - ir_node *right = get_Cmp_right(pred); - - if( (mode_is_int(mode) || mode_is_character(mode) - || mode_is_reference(mode)) && - (get_mode_size_bits(mode) < get_mode_size_bits(lowered_mode) - || classify_Const(right) == CNST_NULL)) { - int pnc = get_Proj_proj(node); - int need_not = 0; - ir_node *a = NULL; - ir_node *b = NULL; - - if(pnc == pn_Cmp_Lt) { - /* a < b -> (a - b) >> 31 */ - a = left; - b = right; - } else if(pnc == pn_Cmp_Le) { - /* a <= b -> ((a - b) >> 31) ^ 1 */ - a = right; - b = left; - need_not = 1; - } else if(pnc == pn_Cmp_Gt) { - /* a > b -> (b - a) >> 31 */ - a = right; - b = left; - } else if(pnc == pn_Cmp_Ge) { - /* a >= b -> ((a - b) >> 31) ^ 1 */ - a = left; - b = right; - need_not = 1; - } - if(a != NULL) { - tarval *tv = new_tarval_from_long(31, mode_Iu); - ir_node *shift_cnt = new_d_Const(dbgi, mode_Iu, tv); + case iro_Conv: { + ir_node *pred = get_Conv_op(node); + ir_mode *mode = get_irn_mode(pred); + ir_tarval *tv_zeroc = get_mode_null(mode); + ir_node *zero_cmp = new_rd_Const(dbgi, irg, tv_zeroc); - 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); - res = new_rd_Shr(dbgi, irg, block, res, shift_cnt, - lowered_mode); + ir_node *cmp = new_rd_Cmp(dbgi, block, pred, zero_cmp, ir_relation_less_greater); + res = config->create_set(cmp); + break; + } - if(need_not) { - res = create_not(dbgi, res); - } - set_irn_link(node, res); - return res; - } + case iro_Cmp: { + ir_node *left = get_Cmp_left(node); + ir_node *right = get_Cmp_right(node); + ir_mode *cmp_mode = get_irn_mode(left); + ir_relation relation = get_Cmp_relation(node); + + 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) && relation != ir_relation_greater))) { + int need_not = 0; + ir_node *a = NULL; + ir_node *b = NULL; + int bits; + ir_tarval *tv; + ir_node *shift_cnt; + + if (relation == ir_relation_less) { + /* a < b -> (a - b) >> 31 */ + a = left; + b = right; + } else if (relation == ir_relation_less_equal) { + /* a <= b -> ~(a - b) >> 31 */ + a = right; + b = left; + need_not = 1; + } else if (relation == ir_relation_greater) { + /* a > b -> (b - a) >> 31 */ + a = right; + b = left; + } else if (relation == ir_relation_greater_equal) { + /* a >= b -> ~(a - b) >> 31 */ + a = left; + b = right; + need_not = 1; + } else { + goto synth_zero_one; } - { - /* 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); + bits = get_mode_size_bits(mode); + tv = new_tarval_from_long(bits-1, mode_Iu); + shift_cnt = new_rd_Const(dbgi, irg, tv); - 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); - 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 = config->create_set(node); } + break; + } + case iro_Proj: { + ir_node *pred = get_Proj_pred(node); + + 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); + res = node; + goto own_replacement; + } else if (is_Proj(pred) && is_Start(get_Proj_pred(pred))) { + ir_graph *irg = get_irn_irg(node); + ir_entity *entity = get_irg_entity(irg); + ir_type *type = get_entity_type(entity); + adjust_method_type(type); + set_irn_mode(node, mode); + res = node; + goto own_replacement; + } panic("unexpected projb: %+F (pred: %+F)", node, pred); } - if(op == op_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); + + case iro_Const: { + ir_tarval *tv = get_Const_tarval(node); + if (tv == get_tarval_b_true()) { + ir_tarval *tv_one = get_mode_one(mode); + res = new_rd_Const(dbgi, irg, tv_one); + } else if (tv == get_tarval_b_false()) { + ir_tarval *tv_zero = get_mode_null(mode); + res = new_rd_Const(dbgi, irg, tv_zero); } else { panic("invalid boolean const %+F", node); } - set_irn_link(node, res); - return res; + break; } - panic("didn't expect %+F to have mode_b", node); -} + case iro_Unknown: + res = new_r_Unknown(irg, mode); + break; -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); + default: + panic("didn't expect %+F to have mode_b", node); + } - return conv; + ARR_APP1(ir_node*, 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; - (void) env; + bool changed = false; 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)) { - ir_node *pred = get_Proj_pred(in); - if(is_Cmp(pred)) - continue; + if (! config->lower_direct_cmp) { + /* 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_Cmp(in)) { + continue; } } } lowered_in = lower_node(in); - lowered_in = create_convb(lowered_in); + + if (is_Call(node)) { + ir_type *type = get_Call_type(node); + adjust_method_type(type); + } else if (is_Cond(node) || (is_Mux(node) && i == 0)) { + lowered_in = create_convb(lowered_in); + } set_irn_n(node, i, lowered_in); + changed = true; + } + if (changed) { + bool *global_changed = (bool*)env; + *global_changed = true; + add_identities(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); + bool changed = false; + size_t i; + size_t n; -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; - set_using_irn_link(irg); - irg_walk_graph(irg, clear_links, NULL, NULL); - irg_walk_graph(irg, lower_mode_b_walker, NULL, NULL); - clear_using_irn_link(irg); + config = nconfig; + lowered_nodes = NEW_ARR_F(ir_node*, 0); + check_later = NEW_ARR_F(ir_node*, 0); + lowered_type = NULL; + + edges_assure(irg); + + /* ensure no optimisation touches muxes anymore */ + set_irg_state(irg, IR_GRAPH_STATE_KEEP_MUX | IR_GRAPH_STATE_BCONV_ALLOWED); + + ir_reserve_resources(irg, IR_RESOURCE_IRN_LINK); + + adjust_method_type(type); + + irg_walk_graph(irg, firm_clear_link, NULL, NULL); + irg_walk_graph(irg, lower_mode_b_walker, NULL, &changed); + + for (i = 0, n = ARR_LEN(check_later); i < n; ++i) { + ir_node *node = check_later[i]; + irg_walk_core(node, lower_mode_b_walker, NULL, &changed); + } + + for (i = 0, n = ARR_LEN(lowered_nodes); i < n; ++i) { + ir_node *node = lowered_nodes[i]; + maybe_kill_node(node); + } + DEL_ARR_F(check_later); + DEL_ARR_F(lowered_nodes); + + ir_free_resources(irg, IR_RESOURCE_IRN_LINK); + + if (changed) { + /* lowering might create new blocks, so be sure to handle this */ + set_irg_extblk_inconsistent(irg); + set_irg_doms_inconsistent(irg); + edges_deactivate(irg); + } }