X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=ir%2Fbe%2Fbelower.c;h=4378dc7cb56d3ad79cc0b26b29b3bb6d206de6d9;hb=6e3e499d6c68aee0c6a9ada6a99f16c4f6f8445b;hp=9e395671c3d9c87c1cb76e1d50982f0549f1332b;hpb=8786fa72e7744afaaecdab0d002fc821539b79b9;p=libfirm diff --git a/ir/be/belower.c b/ir/be/belower.c index 9e395671c..4378dc7cb 100644 --- a/ir/be/belower.c +++ b/ir/be/belower.c @@ -26,10 +26,11 @@ #include "iredges_t.h" #include "irgwalk.h" -#ifdef _WIN32 -#include -#else -#include +#ifdef HAVE_MALLOC_H + #include +#endif +#ifdef HAVE_ALLOCA_H + #include #endif #undef is_Perm @@ -257,7 +258,7 @@ static void lower_perm_node(ir_node *irn, void *walk_env) { ir_node *arg1, *arg2, *res1, *res2; ir_node *cpyxchg = NULL; - arch_env = env->chord_env->main_env->arch_env; + arch_env = env->chord_env->birg->main_env->arch_env; do_copy = env->do_copy; mod = env->dbg_module; block = get_nodes_block(irn); @@ -409,16 +410,16 @@ static void lower_perm_node(ir_node *irn, void *walk_env) { int pidx = get_pairidx_for_regidx(pairs, n, cycle->elems[i]->index, 0); /* create intermediate proj */ - res2 = new_r_Proj(get_irn_irg(irn), block, cpyxchg, get_irn_mode(res1), 0); + res1 = new_r_Proj(get_irn_irg(irn), block, cpyxchg, get_irn_mode(res1), 0); /* set as in for next Perm */ - pairs[pidx].in_node = res2; + pairs[pidx].in_node = res1; } else { - sched_remove(res2); + sched_remove(res1); } - sched_remove(res1); + sched_remove(res2); set_Proj_pred(res2, cpyxchg); set_Proj_proj(res2, 0); @@ -430,6 +431,14 @@ static void lower_perm_node(ir_node *irn, void *walk_env) { arch_set_irn_register(arch_env, res2, cycle->elems[i + 1]); arch_set_irn_register(arch_env, res1, cycle->elems[i]); + + /* insert the copy/exchange node in schedule after the magic schedule node (see above) */ + sched_add_after(sched_point, cpyxchg); + + DBG((mod, LEVEL_1, "replacing %+F with %+F, placed new node after %+F\n", irn, cpyxchg, sched_point)); + + /* set the new scheduling point */ + sched_point = res1; } else { DBG((mod, LEVEL_1, "%+F creating copy node (%+F, %s) -> (%+F, %s)\n", @@ -443,14 +452,13 @@ static void lower_perm_node(ir_node *irn, void *walk_env) { /* exchange copy node and proj */ exchange(res2, cpyxchg); - } - /* insert the copy/exchange node in schedule after the magic schedule node (see above) */ - sched_add_after(sched_point, cpyxchg); - /* set the new scheduling point */ - sched_point = cpyxchg; + /* insert the copy/exchange node in schedule after the magic schedule node (see above) */ + sched_add_after(sched_point, cpyxchg); - DBG((mod, LEVEL_1, "replacing %+F with %+F, placed new node after %+F\n", irn, cpyxchg, sched_point)); + /* set the new scheduling point */ + sched_point = cpyxchg; + } } free((void *) cycle->elems); @@ -463,159 +471,137 @@ static void lower_perm_node(ir_node *irn, void *walk_env) { -/** - * Adds Projs to keep nodes for each register class, which eats the - * caller saved registers. - * Note: The caller has to make sure, that call is a Call - * - * @param call The Call node - * @param walk_env The walker environment - */ -static void lower_call_node(ir_node *call, const void *walk_env) { - const arch_env_t *arch_env = walk_env; - int bitset_idx = 0; - int set_size = 0; - arch_isa_t *isa = arch_env_get_isa(arch_env); - const ir_node *proj_T = NULL; - ir_node *block = get_nodes_block(call); - const arch_register_class_t *reg_class; - int i, j, pn, keep_arity; - ir_node **in_keep; - bitset_t *proj_set; - const ir_edge_t *edge; - const arch_register_t *reg; - - /* Prepare the bitset where we store the projnums which are already in use*/ - for (i = 0; i < arch_isa_get_n_reg_class(isa); i++) { - reg_class = arch_isa_get_reg_class(isa, i); - set_size += arch_register_class_n_regs(reg_class); +static int get_n_out_edges(const ir_node *irn) { + const ir_edge_t *edge; + int cnt = 0; + + foreach_out_edge(irn, edge) { + cnt++; } - in_keep = xmalloc(set_size * sizeof(ir_node *)); + return cnt; +} - proj_set = bitset_malloc(set_size); - bitset_clear_all(proj_set); +static ir_node *belower_skip_proj(ir_node *irn) { + while(is_Proj(irn)) + irn = get_Proj_pred(irn); + return irn; +} - /* check if there is a ProjT node and which arguments are used */ - foreach_out_edge(call, edge) { - if (get_irn_mode(get_edge_src_irn(edge)) == mode_T) - proj_T = get_edge_src_irn(edge); - } +static void fix_in(ir_node *irn, ir_node *old, ir_node *nw) { + int i, n; - /* set all used arguments */ - if (proj_T) { - foreach_out_edge(proj_T, edge) { - ir_node *proj = get_edge_src_irn(edge); + irn = belower_skip_proj(irn); + n = get_irn_arity(irn); - assert(is_Proj(proj)); - pn = isa->impl->handle_call_proj(isa, proj, 0); - bitset_set(proj_set, pn); + for (i = 0; i < n; i++) { + if (get_irn_n(irn, i) == old) { + set_irn_n(irn, i, nw); + break; } } - else { - proj_T = new_r_Proj(current_ir_graph, block, call, mode_T, pn_Call_T_result); +} + +static void gen_assure_different_pattern(ir_node *irn, be_irg_t *birg, ir_node *other_different) { + const arch_env_t *arch_env = birg->main_env->arch_env; + ir_node *in[2], *keep, *cpy, *temp; + ir_node *block = get_nodes_block(irn); + const arch_register_class_t *cls = arch_get_irn_reg_class(arch_env, other_different, -1); + FIRM_DBG_REGISTER(firm_dbg_module_t *mod, "firm.be.lower"); + + if (arch_irn_is(arch_env, other_different, ignore) || ! mode_is_datab(get_irn_mode(other_different))) { + DBG((mod, LEVEL_1, "ignore constraint for %+F because other_irn is ignore or not a datab node\n", irn)); + return; } - /* Create for each caller save register a proj (keep node argument) */ - /* if this proj is not already present */ - for (i = 0; i < arch_isa_get_n_reg_class(isa); i++) { + /* Make a not spillable copy of the different node */ + /* this is needed because the different irn could be */ + /* in block far far away */ + /* The copy is optimized later if not needed */ - /* reset the keep input, as we need one keep for each register class */ - memset(in_keep, 0, set_size * sizeof(ir_node *)); - keep_arity = 0; - reg_class = arch_isa_get_reg_class(isa, i); + temp = new_rd_Unknown(birg->irg, get_irn_mode(other_different)); + cpy = be_new_Copy(cls, birg->irg, block, temp); + be_node_set_flags(cpy, BE_OUT_POS(0), arch_irn_flags_dont_spill); - for (j = 0; j < arch_register_class_n_regs(reg_class); j++) { - reg = arch_register_for_index(reg_class, j); + in[0] = irn; + in[1] = cpy; - /* only check caller save registers */ - if (arch_register_type_is(reg, caller_save)) { + /* Let the irn use the copy instead of the old other_different */ + fix_in(irn, other_different, cpy); - /* Only create new proj, iff not already present */ - if (!bitset_is_set(proj_set, bitset_idx)) { - ir_node *proj = new_r_Proj(current_ir_graph, block, (ir_node *)proj_T, mode_Is, bitset_idx); + /* Add the Keep resp. CopyKeep and reroute the users */ + /* of the other_different irn in case of CopyKeep. */ + if (get_n_out_edges(other_different) == 0) { + keep = be_new_Keep(cls, birg->irg, block, 2, in); + } + else { + keep = be_new_CopyKeep_single(cls, birg->irg, block, cpy, irn, get_irn_mode(other_different)); + be_node_set_reg_class(keep, 1, cls); + edges_reroute(other_different, keep, birg->irg); + } - pn = isa->impl->handle_call_proj(isa, proj, 1); - in_keep[keep_arity++] = proj; - } + /* after rerouting: let the copy point to the other_different irn */ + set_irn_n(cpy, 0, other_different); - bitset_idx++; - } - } + DBG((mod, LEVEL_1, "created %+F for %+F to assure should_be_different\n", keep, irn)); +} + +/** + * Checks if node has a should_be_different constraint in output + * and adds a Keep then to assure the constraint. + */ +static void assure_different_constraints(ir_node *irn, be_irg_t *birg) { + const arch_env_t *arch_env = birg->main_env->arch_env; + const arch_register_req_t *req; + arch_register_req_t req_temp; + int i, n; - /* ok, we found some caller save register which are not in use but must be saved */ - if (keep_arity) { - be_new_Keep(reg_class, current_ir_graph, block, keep_arity, in_keep); + req = arch_get_register_req(arch_env, &req_temp, irn, -1); + + if (req) { + if (arch_register_req_is(req, should_be_different)) { + gen_assure_different_pattern(irn, birg, req->other_different); + } + else if (arch_register_req_is(req, should_be_different_from_all)) { + n = get_irn_arity(belower_skip_proj(irn)); + for (i = 0; i < n; i++) { + gen_assure_different_pattern(irn, birg, get_irn_n(belower_skip_proj(irn), i)); + } } } - - bitset_free(proj_set); - return; } /** - * Calls the backend code generator functions to lower Spill and - * Reload nodes into Store and Load. The backend is fully responsible - * for creating the new nodes and setting their input correct. - * Note: The caller of this has to make sure that irn is a Spill - * or Reload! + * Calls the functions to assure register constraints. * - * @param irn The Spill/Reload node + * @param irn The node to be checked for lowering * @param walk_env The walker environment */ -static void lower_spill_reload(ir_node *irn, void *walk_env) { - lower_env_t *env = walk_env; - arch_code_generator_t *cg = env->chord_env->main_env->cg; - const arch_env_t *aenv = env->chord_env->main_env->arch_env; - ir_node *res = NULL; - ir_node *sched_point; - - if (be_is_Spill(irn) && cg->impl->lower_spill) { - res = cg->impl->lower_spill(cg, irn); - } - else if (be_is_Reload(irn) && cg->impl->lower_reload) { - res = cg->impl->lower_reload(cg, irn); - if (res && res != irn) { - /* copy the result register from the reload to the load */ - arch_set_irn_register(aenv, res, arch_get_irn_register(aenv, irn)); - } - } +static void assure_constraints_walker(ir_node *irn, void *walk_env) { + if (is_Block(irn)) + return; - if (res && res != irn) { - sched_point = sched_prev(irn); - sched_remove(irn); - exchange(irn, res); - sched_add_after(sched_point, res); - } - else { - DBG((env->dbg_module, LEVEL_1, "node %+F not lowered\n", irn)); - } + if (mode_is_datab(get_irn_mode(irn))) + assure_different_constraints(irn, walk_env); return; } + /** - * Calls the corresponding lowering function for the node. + * Walks over all nodes to assure register constraints. * - * @param irn The node to be checked for lowering - * @param walk_env The walker environment + * @param birg The birg structure containing the irg */ -static void lower_nodes_before_sched_walker(ir_node *irn, void *walk_env) { - const arch_env_t *arch_env = walk_env; - - if (!is_Block(irn) && !is_Proj(irn)) { - if (is_Call(arch_env, irn)) { - lower_call_node(irn, walk_env); - } - } - - return; +void assure_constraints(be_irg_t *birg) { + irg_walk_blkwise_graph(birg->irg, NULL, assure_constraints_walker, birg); } + /** * Calls the corresponding lowering function for the node. * @@ -624,15 +610,12 @@ static void lower_nodes_before_sched_walker(ir_node *irn, void *walk_env) { */ static void lower_nodes_after_ra_walker(ir_node *irn, void *walk_env) { lower_env_t *env = walk_env; - const arch_env_t *arch_env = env->chord_env->main_env->arch_env; + const arch_env_t *arch_env = env->chord_env->birg->main_env->arch_env; if (!is_Block(irn) && !is_Proj(irn)) { if (is_Perm(arch_env, irn)) { lower_perm_node(irn, walk_env); } - else if (be_is_Spill(irn) || be_is_Reload(irn)) { - lower_spill_reload(irn, walk_env); - } } return; @@ -640,22 +623,9 @@ static void lower_nodes_after_ra_walker(ir_node *irn, void *walk_env) { -/** - * Walks over all blocks in an irg and performs lowering need - * to be done before scheduling (e.g. call lowering). - * - * @param chord_env The chordal environment containing the irg - * @param do_copy 1 == resolve cycles with a free reg if available - */ -void lower_nodes_before_sched(ir_graph *irg, const void *env) { - irg_walk_blkwise_graph(irg, NULL, lower_nodes_before_sched_walker, (void *)env); -} - - - /** * Walks over all blocks in an irg and performs lowering need to be - * done after register allocation (e.g. perm and spill/reload lowering). + * done after register allocation (e.g. perm lowering). * * @param chord_env The chordal environment containing the irg * @param do_copy 1 == resolve cycles with a free reg if available @@ -665,7 +635,7 @@ void lower_nodes_after_ra(be_chordal_env_t *chord_env, int do_copy) { env.chord_env = chord_env; env.do_copy = do_copy; - env.dbg_module = firm_dbg_register("firm.be.lower"); + FIRM_DBG_REGISTER(env.dbg_module, "firm.be.lower"); irg_walk_blkwise_graph(chord_env->irg, NULL, lower_nodes_after_ra_walker, &env); }