-/**
- * Project: libFIRM
- * File name: ir/be/ia32/ia32_optimize.c
- * Purpose: Implements several optimizations for IA32
- * Author: Christian Wuerdig
- * CVS-ID: $Id$
- * Copyright: (c) 2006 Universität Karlsruhe
- * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+/*
+ * Copyright (C) 1995-2007 University of Karlsruhe. All right reserved.
+ *
+ * This file is part of libFirm.
+ *
+ * This file may be distributed and/or modified under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation and appearing in the file LICENSE.GPL included in the
+ * packaging of this file.
+ *
+ * Licensees holding valid libFirm Professional Edition licenses may use
+ * this file in accordance with the libFirm Commercial License.
+ * Agreement provided with the Software.
+ *
+ * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+ * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE.
*/
+/**
+ * @file
+ * @brief Implements several optimizations for IA32.
+ * @author Matthias Braun, Christian Wuerdig
+ * @version $Id$
+ */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "irnode.h"
#include "irprog_t.h"
#include "ircons.h"
+#include "irtools.h"
#include "firm_types.h"
#include "iredges.h"
#include "tv.h"
#include "irgmod.h"
#include "irgwalk.h"
#include "height.h"
+#include "irbitset.h"
#include "../be_t.h"
#include "../beabi.h"
#include "ia32_new_nodes.h"
#include "bearch_ia32_t.h"
-#include "gen_ia32_regalloc_if.h" /* the generated interface (register type and class defenitions) */
+#include "gen_ia32_regalloc_if.h"
#include "ia32_transform.h"
#include "ia32_dbg_stat.h"
+#include "ia32_util.h"
-typedef enum {
- IA32_AM_CAND_NONE = 0,
- IA32_AM_CAND_LEFT = 1,
- IA32_AM_CAND_RIGHT = 2,
- IA32_AM_CAND_BOTH = 3
-} ia32_am_cand_t;
-
-#undef is_NoMem
-#define is_NoMem(irn) (get_irn_op(irn) == op_NoMem)
+DEBUG_ONLY(static firm_dbg_module_t *dbg = NULL;)
typedef int is_op_func_t(const ir_node *n);
+typedef ir_node *load_func_t(dbg_info *db, ir_graph *irg, ir_node *block, ir_node *base, ir_node *index, ir_node *mem);
/**
* checks if a node represents the NOREG value
*/
-static int be_is_NoReg(ia32_code_gen_t *cg, const ir_node *irn) {
- be_abi_irg_t *babi = cg->birg->abi;
- const arch_register_t *fp_noreg = USE_SSE2(cg) ?
- &ia32_xmm_regs[REG_XMM_NOREG] : &ia32_vfp_regs[REG_VFP_NOREG];
-
- return (be_abi_get_callee_save_irn(babi, &ia32_gp_regs[REG_GP_NOREG]) == irn) ||
- (be_abi_get_callee_save_irn(babi, fp_noreg) == irn);
-}
-
-
-
-/*************************************************
- * _____ _ _
- * / ____| | | | |
- * | | ___ _ __ ___| |_ __ _ _ __ | |_ ___
- * | | / _ \| '_ \/ __| __/ _` | '_ \| __/ __|
- * | |___| (_) | | | \__ \ || (_| | | | | |_\__ \
- * \_____\___/|_| |_|___/\__\__,_|_| |_|\__|___/
- *
- *************************************************/
-
-/**
- * creates a unique ident by adding a number to a tag
- *
- * @param tag the tag string, must contain a %d if a number
- * should be added
- */
-static ident *unique_id(const char *tag)
-{
- static unsigned id = 0;
- char str[256];
-
- snprintf(str, sizeof(str), tag, ++id);
- return new_id_from_str(str);
-}
-
-
-
-/**
- * Transforms a SymConst.
- *
- * @param mod the debug module
- * @param block the block the new node should belong to
- * @param node the ir SymConst node
- * @param mode mode of the SymConst
- * @return the created ia32 Const node
- */
-static ir_node *gen_SymConst(ia32_transform_env_t *env) {
- ir_node *cnst;
- dbg_info *dbg = env->dbg;
- ir_mode *mode = env->mode;
- ir_graph *irg = env->irg;
- ir_node *block = env->block;
-
- if (mode_is_float(mode)) {
- FP_USED(env->cg);
- if (USE_SSE2(env->cg))
- cnst = new_rd_ia32_xConst(dbg, irg, block, get_irg_no_mem(irg), mode);
- else
- cnst = new_rd_ia32_vfConst(dbg, irg, block, get_irg_no_mem(irg), mode);
- }
- else
- cnst = new_rd_ia32_Const(dbg, irg, block, get_irg_no_mem(irg), mode);
-
- set_ia32_Const_attr(cnst, env->irn);
-
- return cnst;
-}
-
-/**
- * Get a primitive type for a mode.
- */
-static ir_type *get_prim_type(pmap *types, ir_mode *mode)
-{
- pmap_entry *e = pmap_find(types, mode);
- ir_type *res;
-
- if (! e) {
- char buf[64];
- snprintf(buf, sizeof(buf), "prim_type_%s", get_mode_name(mode));
- res = new_type_primitive(new_id_from_str(buf), mode);
- pmap_insert(types, mode, res);
- }
- else
- res = e->value;
- return res;
-}
-
-/**
- * Get an entity that is initialized with a tarval
- */
-static entity *get_entity_for_tv(ia32_code_gen_t *cg, ir_node *cnst)
-{
- tarval *tv = get_Const_tarval(cnst);
- pmap_entry *e = pmap_find(cg->isa->tv_ent, tv);
- entity *res;
- ir_graph *rem;
-
- if (! e) {
- ir_mode *mode = get_irn_mode(cnst);
- ir_type *tp = get_Const_type(cnst);
- if (tp == firm_unknown_type)
- tp = get_prim_type(cg->isa->types, mode);
-
- res = new_entity(get_glob_type(), unique_id(".LC%u"), tp);
-
- set_entity_ld_ident(res, get_entity_ident(res));
- set_entity_visibility(res, visibility_local);
- set_entity_variability(res, variability_constant);
- set_entity_allocation(res, allocation_static);
-
- /* we create a new entity here: It's initialization must resist on the
- const code irg */
- rem = current_ir_graph;
- current_ir_graph = get_const_code_irg();
- set_atomic_ent_value(res, new_Const_type(tv, tp));
- current_ir_graph = rem;
-
- pmap_insert(cg->isa->tv_ent, tv, res);
- }
- else
- res = e->value;
- return res;
-}
-
-/**
- * Transforms a Const.
- *
- * @param mod the debug module
- * @param block the block the new node should belong to
- * @param node the ir Const node
- * @param mode mode of the Const
- * @return the created ia32 Const node
- */
-static ir_node *gen_Const(ia32_transform_env_t *env) {
- ir_node *cnst;
- symconst_symbol sym;
- ir_graph *irg = env->irg;
- ir_node *block = env->block;
- ir_node *node = env->irn;
- dbg_info *dbg = env->dbg;
- ir_mode *mode = env->mode;
-
- if (mode_is_float(mode)) {
- FP_USED(env->cg);
- if (! USE_SSE2(env->cg)) {
- cnst_classify_t clss = classify_Const(node);
-
- if (clss == CNST_NULL)
- return new_rd_ia32_vfldz(dbg, irg, block, mode);
- else if (clss == CNST_ONE)
- return new_rd_ia32_vfld1(dbg, irg, block, mode);
- }
- sym.entity_p = get_entity_for_tv(env->cg, node);
-
- cnst = new_rd_SymConst(dbg, irg, block, sym, symconst_addr_ent);
- env->irn = cnst;
- cnst = gen_SymConst(env);
- }
- else {
- cnst = new_rd_ia32_Const(dbg, irg, block, get_irg_no_mem(irg), get_irn_mode(node));
- set_ia32_Const_attr(cnst, node);
- }
- return cnst;
+static INLINE int be_is_NoReg(ia32_code_gen_t *cg, const ir_node *irn) {
+ return irn == cg->noreg_gp || irn == cg->noreg_xmm || irn == cg->noreg_vfp;
}
-
-
-/**
- * Transforms (all) Const's into ia32_Const and places them in the
- * block where they are used (or in the cfg-pred Block in case of Phi's).
- * Additionally all reference nodes are changed into mode_Is nodes.
- */
-void ia32_place_consts_set_modes(ir_node *irn, void *env) {
- ia32_code_gen_t *cg = env;
- ia32_transform_env_t tenv;
- ir_mode *mode;
- ir_node *pred, *cnst;
- int i;
- opcode opc;
-
- if (is_Block(irn))
- return;
-
- mode = get_irn_mode(irn);
-
- /* transform all reference nodes into mode_Is nodes */
- if (mode_is_reference(mode)) {
- mode = mode_Is;
- set_irn_mode(irn, mode);
- }
-
- /*
- Annotate mode of stored value to link field of the Store
- as floating point converts might be optimized and we would
- loose the mode.
- */
- if (get_irn_opcode(irn) == iro_Store) {
- set_irn_link(irn, get_irn_mode(get_Store_value(irn)));
- }
-
- tenv.block = get_nodes_block(irn);
- tenv.cg = cg;
- tenv.irg = cg->irg;
- DEBUG_ONLY(tenv.mod = cg->mod;)
-
- /* Loop over all predecessors and check for Sym/Const nodes */
- for (i = get_irn_arity(irn) - 1; i >= 0; --i) {
- pred = get_irn_n(irn, i);
- cnst = NULL;
- opc = get_irn_opcode(pred);
- tenv.irn = pred;
- tenv.mode = get_irn_mode(pred);
- tenv.dbg = get_irn_dbg_info(pred);
-
- /* If it's a Phi, then we need to create the */
- /* new Const in it's predecessor block */
- if (is_Phi(irn)) {
- tenv.block = get_Block_cfgpred_block(get_nodes_block(irn), i);
- }
-
- /* put the const into the block where the original const was */
- if (! (cg->opt & IA32_OPT_PLACECNST)) {
- tenv.block = get_nodes_block(pred);
- }
-
- switch (opc) {
- case iro_Const:
- cnst = gen_Const(&tenv);
- break;
- case iro_SymConst:
- cnst = gen_SymConst(&tenv);
- break;
- default:
- break;
- }
-
- /* if we found a const, then set it */
- if (cnst) {
- set_irn_n(irn, i, cnst);
- }
- }
-}
-
-
-
/********************************************************************************************************
* _____ _ _ ____ _ _ _ _ _
* | __ \ | | | | / __ \ | | (_) (_) | | (_)
* NOTE: THESE PEEPHOLE OPTIMIZATIONS MUST BE CALLED AFTER SCHEDULING AND REGISTER ALLOCATION.
*/
-static int ia32_cnst_compare(ir_node *n1, ir_node *n2) {
- return get_ia32_id_cnst(n1) == get_ia32_id_cnst(n2);
-}
+// only optimize up to 48 stores behind IncSPs
+#define MAXPUSH_OPTIMIZE 48
/**
- * Checks for potential CJmp/CJmpAM optimization candidates.
+ * Tries to create pushs from IncSP,Store combinations
*/
-static ir_node *ia32_determine_cjmp_cand(ir_node *irn, is_op_func_t *is_op_func) {
- ir_node *cand = NULL;
- ir_node *prev = sched_prev(irn);
-
- if (is_Block(prev)) {
- if (get_Block_n_cfgpreds(prev) == 1)
- prev = get_Block_cfgpred(prev, 0);
- else
- prev = NULL;
- }
+static void ia32_create_Pushs(ir_node *irn, ia32_code_gen_t *cg) {
+ int i;
+ int offset;
+ ir_node *node;
+ ir_node *stores[MAXPUSH_OPTIMIZE];
+ ir_node *block = get_nodes_block(irn);
+ ir_graph *irg = cg->irg;
+ ir_node *curr_sp;
+ ir_mode *spmode = get_irn_mode(irn);
- /* The predecessor must be a ProjX. */
- if (prev && is_Proj(prev) && get_irn_mode(prev) == mode_X) {
- prev = get_Proj_pred(prev);
+ memset(stores, 0, sizeof(stores));
- if (is_op_func(prev))
- cand = prev;
- }
-
- return cand;
-}
+ assert(be_is_IncSP(irn));
-static int is_TestJmp_cand(const ir_node *irn) {
- return is_ia32_TestJmp(irn) || is_ia32_And(irn);
-}
+ offset = be_get_IncSP_offset(irn);
+ if(offset < 4)
+ return;
-/**
- * Checks if two consecutive arguments of cand matches
- * the two arguments of irn (TestJmp).
- */
-static int is_TestJmp_replacement(ir_node *cand, ir_node *irn) {
- ir_node *in1 = get_irn_n(irn, 0);
- ir_node *in2 = get_irn_n(irn, 1);
- int i, n = get_irn_arity(cand);
- int same_args = 0;
-
- for (i = 0; i < n - 1; i++) {
- if (get_irn_n(cand, i) == in1 &&
- get_irn_n(cand, i + 1) == in2)
- {
- same_args = 1;
+ /*
+ * We first walk the schedule after the IncSP node as long as we find
+ * suitable stores that could be transformed to a push.
+ * We save them into the stores array which is sorted by the frame offset/4
+ * attached to the node
+ */
+ for(node = sched_next(irn); !sched_is_end(node); node = sched_next(node)) {
+ ir_node *mem;
+ int offset;
+ int storeslot;
+
+ // it has to be a store
+ if(!is_ia32_Store(node))
break;
+
+ // it has to use our sp value
+ if(get_irn_n(node, 0) != irn)
+ continue;
+ // store has to be attached to NoMem
+ mem = get_irn_n(node, 3);
+ if(!is_NoMem(mem)) {
+ continue;
}
- }
- if (same_args)
- return ia32_cnst_compare(cand, irn);
+ /* unfortunately we can't support the full AMs possible for push at the
+ * moment. TODO: fix this */
+ if(get_ia32_am_scale(node) > 0 || !is_ia32_NoReg_GP(get_irn_n(node, 1)))
+ break;
- return 0;
-}
+ offset = get_ia32_am_offs_int(node);
-/**
- * Tries to replace a TestJmp by a CJmp or CJmpAM (in case of And)
- */
-static void ia32_optimize_TestJmp(ir_node *irn, ia32_code_gen_t *cg) {
- ir_node *cand = ia32_determine_cjmp_cand(irn, is_TestJmp_cand);
- int replace = 0;
+ storeslot = offset / 4;
+ if(storeslot >= MAXPUSH_OPTIMIZE)
+ continue;
- /* we found a possible candidate */
- replace = cand ? is_TestJmp_replacement(cand, irn) : 0;
-
- if (replace) {
- DBG((cg->mod, LEVEL_1, "replacing %+F by ", irn));
+ // storing into the same slot twice is bad (and shouldn't happen...)
+ if(stores[storeslot] != NULL)
+ break;
- if (is_ia32_And(cand))
- set_irn_op(irn, op_ia32_CJmpAM);
- else
- set_irn_op(irn, op_ia32_CJmp);
+ // storing at half-slots is bad
+ if(offset % 4 != 0)
+ break;
- DB((cg->mod, LEVEL_1, "%+F\n", irn));
+ stores[storeslot] = node;
}
-}
-
-static int is_CondJmp_cand(const ir_node *irn) {
- return is_ia32_CondJmp(irn) || is_ia32_Sub(irn);
-}
-/**
- * Checks if the arguments of cand are the same of irn.
- */
-static int is_CondJmp_replacement(ir_node *cand, ir_node *irn) {
- int i, n = get_irn_arity(cand);
- int same_args = 1;
+ curr_sp = get_irn_n(irn, 0);
- for (i = 0; i < n; i++) {
- if (get_irn_n(cand, i) != get_irn_n(irn, i)) {
- same_args = 0;
- break;
- }
+ // walk the stores in inverse order and create pushs for them
+ i = (offset / 4) - 1;
+ if(i >= MAXPUSH_OPTIMIZE) {
+ i = MAXPUSH_OPTIMIZE - 1;
}
- if (same_args)
- return ia32_cnst_compare(cand, irn);
-
- return 0;
-}
+ for( ; i >= 0; --i) {
+ const arch_register_t *spreg;
+ ir_node *push;
+ ir_node *val, *mem, *mem_proj;
+ ir_node *store = stores[i];
+ ir_node *noreg = ia32_new_NoReg_gp(cg);
-/**
- * Tries to replace a CondJmp by a CJmpAM
- */
-static void ia32_optimize_CondJmp(ir_node *irn, ia32_code_gen_t *cg) {
- ir_node *cand = ia32_determine_cjmp_cand(irn, is_CondJmp_cand);
- int replace = 0;
+ if(store == NULL || is_Bad(store))
+ break;
- /* we found a possible candidate */
- replace = cand ? is_CondJmp_replacement(cand, irn) : 0;
+ val = get_irn_n(store, 2);
+ mem = get_irn_n(store, 3);
+ spreg = arch_get_irn_register(cg->arch_env, curr_sp);
- if (replace) {
- DBG((cg->mod, LEVEL_1, "replacing %+F by ", irn));
- DBG_OPT_CJMP(irn);
+ push = new_rd_ia32_Push(get_irn_dbg_info(store), irg, block, noreg, noreg, val, curr_sp, mem);
- set_irn_op(irn, op_ia32_CJmpAM);
+ set_ia32_am_support(push, ia32_am_Source, ia32_am_unary);
- DB((cg->mod, LEVEL_1, "%+F\n", irn));
- }
-}
+ sched_add_before(irn, push);
-/**
- * Creates a Push from Store(IncSP(gp_reg_size))
- */
-static void ia32_create_Push(ir_node *irn, ia32_code_gen_t *cg) {
- ir_node *sp = get_irn_n(irn, 0);
- ir_node *val, *next, *push, *bl, *proj_M, *proj_res, *old_proj_M;
- const ir_edge_t *edge;
- heights_t *h;
-
- /* do not create push if store has already an offset assigned or base is not a IncSP */
- if (get_ia32_am_offs(irn) || ! be_is_IncSP(sp))
- return;
+ // create stackpointer proj
+ curr_sp = new_r_Proj(irg, block, push, spmode, pn_ia32_Push_stack);
+ arch_set_irn_register(cg->arch_env, curr_sp, spreg);
- /* do not create push if index is not NOREG */
- if (arch_get_irn_register(cg->arch_env, get_irn_n(irn, 1)) !=
- &ia32_gp_regs[REG_GP_NOREG])
- return;
+ // create memory proj
+ mem_proj = new_r_Proj(irg, block, push, mode_M, pn_ia32_Push_M);
- /* do not create push for floating point */
- val = get_irn_n(irn, 2);
- if (mode_is_float(get_irn_mode(val)))
- return;
+ // use the memproj now
+ exchange(store, mem_proj);
- /* do not create push if IncSp doesn't expand stack or expand size is different from register size */
- if (be_get_IncSP_direction(sp) != be_stack_dir_expand ||
- be_get_IncSP_offset(sp) != get_mode_size_bytes(ia32_reg_classes[CLASS_ia32_gp].mode))
- return;
+ // we can remove the store now
+ sched_remove(store);
- /* do not create push, if there is a path (inside the block) from the push value to IncSP */
- h = heights_new(cg->irg);
- if (get_nodes_block(val) == get_nodes_block(sp) &&
- heights_reachable_in_block(h, val, sp))
- {
- heights_free(h);
- return;
+ offset -= 4;
}
- heights_free(h);
- /* ok, translate into Push */
- edge = get_irn_out_edge_first(irn);
- old_proj_M = get_edge_src_irn(edge);
+ be_set_IncSP_offset(irn, offset);
- next = sched_next(irn);
- sched_remove(irn);
- sched_remove(sp);
+ // can we remove the IncSP now?
+ if(offset == 0) {
+ const ir_edge_t *edge, *next;
- bl = get_nodes_block(irn);
- push = new_rd_ia32_Push(NULL, current_ir_graph, bl,
- be_get_IncSP_pred(sp), val, be_get_IncSP_mem(sp));
- proj_res = new_r_Proj(current_ir_graph, bl, push, get_irn_mode(sp), pn_ia32_Push_stack);
- proj_M = new_r_Proj(current_ir_graph, bl, push, mode_M, pn_ia32_Push_M);
+ foreach_out_edge_safe(irn, edge, next) {
+ ir_node *arg = get_edge_src_irn(edge);
+ int pos = get_edge_src_pos(edge);
- /* copy a possible constant from the store */
- set_ia32_id_cnst(push, get_ia32_id_cnst(irn));
- set_ia32_immop_type(push, get_ia32_immop_type(irn));
-
- /* the push must have SP out register */
- arch_set_irn_register(cg->arch_env, push, arch_get_irn_register(cg->arch_env, sp));
+ set_irn_n(arg, pos, curr_sp);
+ }
- exchange(old_proj_M, proj_M);
- exchange(sp, proj_res);
- sched_add_before(next, push);
- sched_add_after(push, proj_res);
+ set_irn_n(irn, 0, new_Bad());
+ sched_remove(irn);
+ } else {
+ set_irn_n(irn, 0, curr_sp);
+ }
}
/**
- * Creates a Pop from IncSP(Load(sp))
+ * Tries to optimize two following IncSP.
*/
-static void ia32_create_Pop(ir_node *irn, ia32_code_gen_t *cg) {
- ir_node *old_proj_M = be_get_IncSP_mem(irn);
- ir_node *load = skip_Proj(old_proj_M);
- ir_node *old_proj_res = NULL;
- ir_node *bl, *pop, *next, *proj_res, *proj_sp, *proj_M;
- const ir_edge_t *edge;
- const arch_register_t *reg, *sp;
-
- if (! is_ia32_Load(load) || get_ia32_am_offs(load))
- return;
+static void ia32_optimize_IncSP(ir_node *node)
+{
+ int pred_offs;
+ int curr_offs;
+ int offs;
+ ir_node *pred = be_get_IncSP_pred(node);
+ ir_node *predpred;
- if (arch_get_irn_register(cg->arch_env, get_irn_n(load, 1)) !=
- &ia32_gp_regs[REG_GP_NOREG])
+ if(!be_is_IncSP(pred))
return;
- if (arch_get_irn_register(cg->arch_env, get_irn_n(load, 0)) != cg->isa->arch_isa.sp)
+
+ if(get_irn_n_edges(pred) > 1)
return;
- /* ok, translate into pop */
- foreach_out_edge(load, edge) {
- ir_node *succ = get_edge_src_irn(edge);
- if (succ != old_proj_M) {
- old_proj_res = succ;
- break;
+ pred_offs = be_get_IncSP_offset(pred);
+ curr_offs = be_get_IncSP_offset(node);
+
+ if(pred_offs == BE_STACK_FRAME_SIZE_EXPAND) {
+ if(curr_offs != BE_STACK_FRAME_SIZE_SHRINK) {
+ return;
}
+ offs = 0;
+ } else if(pred_offs == BE_STACK_FRAME_SIZE_SHRINK) {
+ if(curr_offs != BE_STACK_FRAME_SIZE_EXPAND) {
+ return;
+ }
+ offs = 0;
+ } else if(curr_offs == BE_STACK_FRAME_SIZE_EXPAND
+ || curr_offs == BE_STACK_FRAME_SIZE_SHRINK) {
+ return;
+ } else {
+ offs = curr_offs + pred_offs;
}
- if (! old_proj_res) {
- assert(0);
- return; /* should not happen */
- }
-
- bl = get_nodes_block(load);
-
- /* IncSP is typically scheduled after the load, so remove it first */
- sched_remove(irn);
- next = sched_next(old_proj_res);
- sched_remove(old_proj_res);
- sched_remove(load);
-
- reg = arch_get_irn_register(cg->arch_env, load);
- sp = arch_get_irn_register(cg->arch_env, irn);
-
- pop = new_rd_ia32_Pop(NULL, current_ir_graph, bl, get_irn_n(irn, 0), get_irn_n(load, 2));
- proj_res = new_r_Proj(current_ir_graph, bl, pop, get_irn_mode(old_proj_res), pn_ia32_Pop_res);
- proj_sp = new_r_Proj(current_ir_graph, bl, pop, get_irn_mode(irn), pn_ia32_Pop_stack);
- proj_M = new_r_Proj(current_ir_graph, bl, pop, mode_M, pn_ia32_Pop_M);
- exchange(old_proj_M, proj_M);
- exchange(old_proj_res, proj_res);
- exchange(irn, proj_sp);
+ be_set_IncSP_offset(node, offs);
- arch_set_irn_register(cg->arch_env, proj_res, reg);
- arch_set_irn_register(cg->arch_env, proj_sp, sp);
+ /* rewire dependency edges */
+ predpred = be_get_IncSP_pred(pred);
+ edges_reroute_kind(pred, predpred, EDGE_KIND_DEP, current_ir_graph);
- sched_add_before(next, proj_sp);
- sched_add_before(proj_sp, proj_res);
- sched_add_before(proj_res,pop);
-}
-
-/**
- * Tries to optimize two following IncSP.
- */
-static void ia32_optimize_IncSP(ir_node *irn, ia32_code_gen_t *cg) {
- ir_node *prev = be_get_IncSP_pred(irn);
- int real_uses = get_irn_n_edges(prev);
-
- if (be_is_IncSP(prev) && real_uses == 1) {
- /* first IncSP has only one IncSP user, kill the first one */
- unsigned prev_offs = be_get_IncSP_offset(prev);
- be_stack_dir_t prev_dir = be_get_IncSP_direction(prev);
- unsigned curr_offs = be_get_IncSP_offset(irn);
- be_stack_dir_t curr_dir = be_get_IncSP_direction(irn);
-
- int new_ofs = prev_offs * (prev_dir == be_stack_dir_expand ? -1 : +1) +
- curr_offs * (curr_dir == be_stack_dir_expand ? -1 : +1);
-
- if (new_ofs < 0) {
- new_ofs = -new_ofs;
- curr_dir = be_stack_dir_expand;
- }
- else
- curr_dir = be_stack_dir_shrink;
- be_set_IncSP_offset(prev, 0);
- be_set_IncSP_offset(irn, (unsigned)new_ofs);
- be_set_IncSP_direction(irn, curr_dir);
-
- /* Omit the optimized IncSP */
- be_set_IncSP_pred(irn, be_get_IncSP_pred(prev));
- }
+ /* Omit the IncSP */
+ be_set_IncSP_pred(node, predpred);
+ sched_remove(pred);
+ be_kill_node(pred);
}
/**
* Performs Peephole Optimizations.
*/
-void ia32_peephole_optimization(ir_node *irn, void *env) {
+static void ia32_peephole_optimize_node(ir_node *node, void *env) {
ia32_code_gen_t *cg = env;
- if (is_ia32_TestJmp(irn))
- ia32_optimize_TestJmp(irn, cg);
- else if (is_ia32_CondJmp(irn))
- ia32_optimize_CondJmp(irn, cg);
- /* seems to be buggy when using Pushes */
-// else if (be_is_IncSP(irn))
-// ia32_optimize_IncSP(irn, cg);
- else if (is_ia32_Store(irn))
- ia32_create_Push(irn, cg);
-}
+ if (be_is_IncSP(node)) {
+ ia32_optimize_IncSP(node);
+ if (cg->opt & IA32_OPT_PUSHARGS)
+ ia32_create_Pushs(node, cg);
+ }
+}
+void ia32_peephole_optimization(ir_graph *irg, ia32_code_gen_t *cg) {
+ irg_walk_graph(irg, ia32_peephole_optimize_node, NULL, cg);
+}
/******************************************************************
* _ _ __ __ _
*
******************************************************************/
-typedef struct {
- ia32_code_gen_t *cg;
- heights_t *h;
-} ia32_am_opt_env_t;
-
-static int node_is_ia32_comm(const ir_node *irn) {
- return is_ia32_irn(irn) ? is_ia32_commutative(irn) : 0;
-}
-
-static int ia32_get_irn_n_edges(const ir_node *irn) {
- const ir_edge_t *edge;
- int cnt = 0;
-
- foreach_out_edge(irn, edge) {
- cnt++;
- }
-
- return cnt;
-}
-
-/**
- * Returns the first mode_M Proj connected to irn.
- */
-static ir_node *get_mem_proj(const ir_node *irn) {
- const ir_edge_t *edge;
- ir_node *src;
-
- assert(get_irn_mode(irn) == mode_T && "expected mode_T node");
-
- foreach_out_edge(irn, edge) {
- src = get_edge_src_irn(edge);
-
- assert(is_Proj(src) && "Proj expected");
-
- if (get_irn_mode(src) == mode_M)
- return src;
- }
-
- return NULL;
-}
-
-/**
- * Returns the first Proj with mode != mode_M connected to irn.
- */
-static ir_node *get_res_proj(const ir_node *irn) {
- const ir_edge_t *edge;
- ir_node *src;
-
- assert(get_irn_mode(irn) == mode_T && "expected mode_T node");
-
- foreach_out_edge(irn, edge) {
- src = get_edge_src_irn(edge);
-
- assert(is_Proj(src) && "Proj expected");
-
- if (get_irn_mode(src) != mode_M)
- return src;
- }
-
- return NULL;
-}
-
/**
- * Determines if pred is a Proj and if is_op_func returns true for it's predecessor.
- *
- * @param pred The node to be checked
- * @param is_op_func The check-function
- * @return 1 if conditions are fulfilled, 0 otherwise
+ * Removes node from schedule if it is not used anymore. If irn is a mode_T node
+ * all it's Projs are removed as well.
+ * @param irn The irn to be removed from schedule
*/
-static int pred_is_specific_node(const ir_node *pred, is_op_func_t *is_op_func) {
- if (is_Proj(pred) && is_op_func(get_Proj_pred(pred))) {
- return 1;
- }
-
- return 0;
-}
-
-/**
- * Determines if pred is a Proj and if is_op_func returns true for it's predecessor
- * and if the predecessor is in block bl.
- *
- * @param bl The block
- * @param pred The node to be checked
- * @param is_op_func The check-function
- * @return 1 if conditions are fulfilled, 0 otherwise
- */
-static int pred_is_specific_nodeblock(const ir_node *bl, const ir_node *pred,
- int (*is_op_func)(const ir_node *n))
+static INLINE void try_kill(ir_node *node)
{
- if (is_Proj(pred)) {
- pred = get_Proj_pred(pred);
- if ((bl == get_nodes_block(pred)) && is_op_func(pred)) {
- return 1;
+ if(get_irn_mode(node) == mode_T) {
+ const ir_edge_t *edge, *next;
+ foreach_out_edge_safe(node, edge, next) {
+ ir_node *proj = get_edge_src_irn(edge);
+ try_kill(proj);
}
}
- return 0;
-}
-
-/**
- * Checks if irn is a candidate for address calculation.
- *
- * - none of the operand must be a Load within the same block OR
- * - all Loads must have more than one user OR
- * - the irn has a frame entity (it's a former FrameAddr)
- *
- * @param block The block the Loads must/mustnot be in
- * @param irn The irn to check
- * return 1 if irn is a candidate, 0 otherwise
- */
-static int is_addr_candidate(const ir_node *block, const ir_node *irn) {
- ir_node *in, *left, *right;
- int n, is_cand = 1;
-
- left = get_irn_n(irn, 2);
- right = get_irn_n(irn, 3);
-
- in = left;
-
- if (pred_is_specific_nodeblock(block, in, is_ia32_Ld)) {
- n = ia32_get_irn_n_edges(in);
- is_cand = (n == 1) ? 0 : is_cand; /* load with only one user: don't create LEA */
- }
-
- in = right;
+ if(get_irn_n_edges(node) != 0)
+ return;
- if (pred_is_specific_nodeblock(block, in, is_ia32_Ld)) {
- n = ia32_get_irn_n_edges(in);
- is_cand = (n == 1) ? 0 : is_cand; /* load with only one user: don't create LEA */
+ if (sched_is_scheduled(node)) {
+ sched_remove(node);
}
- is_cand = get_ia32_frame_ent(irn) ? 1 : is_cand;
-
- return is_cand;
+ be_kill_node(node);
}
-/**
- * Checks if irn is a candidate for address mode.
- *
- * address mode (AM):
- * - at least one operand has to be a Load within the same block AND
- * - the load must not have other users than the irn AND
- * - the irn must not have a frame entity set
- *
- * @param h The height information of the irg
- * @param block The block the Loads must/mustnot be in
- * @param irn The irn to check
- * return 0 if irn is no candidate, 1 if left load can be used, 2 if right one, 3 for both
- */
-static ia32_am_cand_t is_am_candidate(heights_t *h, const ir_node *block, ir_node *irn) {
- ir_node *in, *load, *other, *left, *right;
- int n, is_cand = 0, cand;
-
- if (is_ia32_Ld(irn) || is_ia32_St(irn) || is_ia32_Store8Bit(irn) || is_ia32_vfild(irn) || is_ia32_vfist(irn))
- return 0;
-
- left = get_irn_n(irn, 2);
- right = get_irn_n(irn, 3);
-
- in = left;
-
- if (pred_is_specific_nodeblock(block, in, is_ia32_Ld)) {
- n = ia32_get_irn_n_edges(in);
- is_cand = (n == 1) ? 1 : is_cand; /* load with more than one user: no AM */
-
- load = get_Proj_pred(in);
- other = right;
-
- /* If there is a data dependency of other irn from load: cannot use AM */
- if (get_nodes_block(other) == block) {
- other = skip_Proj(other);
- is_cand = heights_reachable_in_block(h, other, load) ? 0 : is_cand;
- }
- }
+static void optimize_conv_store(ir_node *node)
+{
+ ir_node *pred;
+ ir_mode *conv_mode;
+ ir_mode *store_mode;
- cand = is_cand ? IA32_AM_CAND_LEFT : IA32_AM_CAND_NONE;
- in = right;
- is_cand = 0;
+ if(!is_ia32_Store(node) && !is_ia32_Store8Bit(node))
+ return;
- if (pred_is_specific_nodeblock(block, in, is_ia32_Ld)) {
- n = ia32_get_irn_n_edges(in);
- is_cand = (n == 1) ? 1 : is_cand; /* load with more than one user: no AM */
+ pred = get_irn_n(node, 2);
+ if(!is_ia32_Conv_I2I(pred) && !is_ia32_Conv_I2I8Bit(pred))
+ return;
- load = get_Proj_pred(in);
- other = left;
+ /* the store only stores the lower bits, so we only need the conv
+ * it it shrinks the mode */
+ conv_mode = get_ia32_ls_mode(pred);
+ store_mode = get_ia32_ls_mode(node);
+ if(get_mode_size_bits(conv_mode) < get_mode_size_bits(store_mode))
+ return;
- /* If there is a data dependency of other irn from load: cannot use load */
- if (get_nodes_block(other) == block) {
- other = skip_Proj(other);
- is_cand = heights_reachable_in_block(h, other, load) ? 0 : is_cand;
- }
+ set_irn_n(node, 2, get_irn_n(pred, 2));
+ if(get_irn_n_edges(pred) == 0) {
+ be_kill_node(pred);
}
-
- cand = is_cand ? (cand | IA32_AM_CAND_RIGHT) : cand;
-
- /* if the irn has a frame entity: we do not use address mode */
- return get_ia32_frame_ent(irn) ? IA32_AM_CAND_NONE : cand;
}
-/**
- * Compares the base and index addr and the load/store entities
- * and returns 1 if they are equal.
- */
-static int load_store_addr_is_equal(const ir_node *load, const ir_node *store,
- const ir_node *addr_b, const ir_node *addr_i)
+static void optimize_load_conv(ir_node *node)
{
- int is_equal = (addr_b == get_irn_n(load, 0)) && (addr_i == get_irn_n(load, 1));
- entity *lent = get_ia32_frame_ent(load);
- entity *sent = get_ia32_frame_ent(store);
- ident *lid = get_ia32_am_sc(load);
- ident *sid = get_ia32_am_sc(store);
- char *loffs = get_ia32_am_offs(load);
- char *soffs = get_ia32_am_offs(store);
-
- /* are both entities set and equal? */
- if (is_equal && (lent || sent))
- is_equal = lent && sent && (lent == sent);
-
- /* are address mode idents set and equal? */
- if (is_equal && (lid || sid))
- is_equal = lid && sid && (lid == sid);
-
- /* are offsets set and equal */
- if (is_equal && (loffs || soffs))
- is_equal = loffs && soffs && strcmp(loffs, soffs) == 0;
-
- /* are the load and the store of the same mode? */
- is_equal = is_equal ? get_ia32_ls_mode(load) == get_ia32_ls_mode(store) : 0;
-
- return is_equal;
-}
-
-typedef enum _ia32_take_lea_attr {
- IA32_LEA_ATTR_NONE = 0,
- IA32_LEA_ATTR_BASE = (1 << 0),
- IA32_LEA_ATTR_INDEX = (1 << 1),
- IA32_LEA_ATTR_OFFS = (1 << 2),
- IA32_LEA_ATTR_SCALE = (1 << 3),
- IA32_LEA_ATTR_AMSC = (1 << 4),
- IA32_LEA_ATTR_FENT = (1 << 5)
-} ia32_take_lea_attr;
+ ir_node *pred, *predpred;
+ ir_mode *load_mode;
+ ir_mode *conv_mode;
-/**
- * Decides if we have to keep the LEA operand or if we can assimilate it.
- */
-static int do_new_lea(ir_node *irn, ir_node *base, ir_node *index, ir_node *lea,
- int have_am_sc, ia32_code_gen_t *cg)
-{
- ir_node *lea_base = get_irn_n(lea, 0);
- ir_node *lea_idx = get_irn_n(lea, 1);
- entity *irn_ent = get_ia32_frame_ent(irn);
- entity *lea_ent = get_ia32_frame_ent(lea);
- int ret_val = 0;
- int is_noreg_base = be_is_NoReg(cg, base);
- int is_noreg_index = be_is_NoReg(cg, index);
- ia32_am_flavour_t am_flav = get_ia32_am_flavour(lea);
-
- /* If the Add and the LEA both have a different frame entity set: keep */
- if (irn_ent && lea_ent && (irn_ent != lea_ent))
- return IA32_LEA_ATTR_NONE;
- else if (! irn_ent && lea_ent)
- ret_val |= IA32_LEA_ATTR_FENT;
-
- /* If the Add and the LEA both have already an address mode symconst: keep */
- if (have_am_sc && get_ia32_am_sc(lea))
- return IA32_LEA_ATTR_NONE;
- else if (get_ia32_am_sc(lea))
- ret_val |= IA32_LEA_ATTR_AMSC;
-
- /* Check the different base-index combinations */
-
- if (! is_noreg_base && ! is_noreg_index) {
- /* Assimilate if base is the lea and the LEA is just a Base + Offset calculation */
- if ((base == lea) && ! (am_flav & ia32_I ? 1 : 0)) {
- if (am_flav & ia32_O)
- ret_val |= IA32_LEA_ATTR_OFFS;
-
- ret_val |= IA32_LEA_ATTR_BASE;
- }
- else
- return IA32_LEA_ATTR_NONE;
- }
- else if (! is_noreg_base && is_noreg_index) {
- /* Base is set but index not */
- if (base == lea) {
- /* Base points to LEA: assimilate everything */
- if (am_flav & ia32_O)
- ret_val |= IA32_LEA_ATTR_OFFS;
- if (am_flav & ia32_S)
- ret_val |= IA32_LEA_ATTR_SCALE;
- if (am_flav & ia32_I)
- ret_val |= IA32_LEA_ATTR_INDEX;
-
- ret_val |= IA32_LEA_ATTR_BASE;
- }
- else if (am_flav & ia32_B ? 0 : 1) {
- /* Base is not the LEA but the LEA is an index only calculation: assimilate */
- if (am_flav & ia32_O)
- ret_val |= IA32_LEA_ATTR_OFFS;
- if (am_flav & ia32_S)
- ret_val |= IA32_LEA_ATTR_SCALE;
-
- ret_val |= IA32_LEA_ATTR_INDEX;
- }
- else
- return IA32_LEA_ATTR_NONE;
- }
- else if (is_noreg_base && ! is_noreg_index) {
- /* Index is set but not base */
- if (index == lea) {
- /* Index points to LEA: assimilate everything */
- if (am_flav & ia32_O)
- ret_val |= IA32_LEA_ATTR_OFFS;
- if (am_flav & ia32_S)
- ret_val |= IA32_LEA_ATTR_SCALE;
- if (am_flav & ia32_B)
- ret_val |= IA32_LEA_ATTR_BASE;
-
- ret_val |= IA32_LEA_ATTR_INDEX;
- }
- else if (am_flav & ia32_I ? 0 : 1) {
- /* Index is not the LEA but the LEA is a base only calculation: assimilate */
- if (am_flav & ia32_O)
- ret_val |= IA32_LEA_ATTR_OFFS;
- if (am_flav & ia32_S)
- ret_val |= IA32_LEA_ATTR_SCALE;
-
- ret_val |= IA32_LEA_ATTR_BASE;
- }
- else
- return IA32_LEA_ATTR_NONE;
- }
- else {
- assert(0 && "There must have been set base or index");
- }
-
- return ret_val;
-}
+ if (!is_ia32_Conv_I2I(node) && !is_ia32_Conv_I2I8Bit(node))
+ return;
+ pred = get_irn_n(node, 2);
+ if(!is_Proj(pred))
+ return;
-/**
- * Folds Add or Sub to LEA if possible
- */
-static ir_node *fold_addr(ia32_code_gen_t *cg, ir_node *irn, ir_node *noreg) {
- ir_graph *irg = get_irn_irg(irn);
- dbg_info *dbg = get_irn_dbg_info(irn);
- ir_node *block = get_nodes_block(irn);
- ir_node *res = irn;
- ir_node *shift = NULL;
- ir_node *lea_o = NULL;
- ir_node *lea = NULL;
- char *offs = NULL;
- const char *offs_cnst = NULL;
- char *offs_lea = NULL;
- int scale = 0;
- int isadd = 0;
- int dolea = 0;
- int have_am_sc = 0;
- int am_sc_sign = 0;
- ident *am_sc = NULL;
- entity *lea_ent = NULL;
- ir_node *left, *right, *temp;
- ir_node *base, *index;
- ia32_am_flavour_t am_flav;
- DEBUG_ONLY(firm_dbg_module_t *mod = cg->mod;)
-
- if (is_ia32_Add(irn))
- isadd = 1;
-
- left = get_irn_n(irn, 2);
- right = get_irn_n(irn, 3);
-
- /* "normalize" arguments in case of add with two operands */
- if (isadd && ! be_is_NoReg(cg, right)) {
- /* put LEA == ia32_am_O as right operand */
- if (is_ia32_Lea(left) && get_ia32_am_flavour(left) == ia32_am_O) {
- set_irn_n(irn, 2, right);
- set_irn_n(irn, 3, left);
- temp = left;
- left = right;
- right = temp;
- }
+ predpred = get_Proj_pred(pred);
+ if(!is_ia32_Load(predpred))
+ return;
- /* put LEA != ia32_am_O as left operand */
- if (is_ia32_Lea(right) && get_ia32_am_flavour(right) != ia32_am_O) {
- set_irn_n(irn, 2, right);
- set_irn_n(irn, 3, left);
- temp = left;
- left = right;
- right = temp;
- }
+ /* the load is sign extending the upper bits, so we only need the conv
+ * if it shrinks the mode */
+ load_mode = get_ia32_ls_mode(predpred);
+ conv_mode = get_ia32_ls_mode(node);
+ if(get_mode_size_bits(conv_mode) < get_mode_size_bits(load_mode))
+ return;
- /* put SHL as left operand iff left is NOT a LEA */
- if (! is_ia32_Lea(left) && pred_is_specific_node(right, is_ia32_Shl)) {
- set_irn_n(irn, 2, right);
- set_irn_n(irn, 3, left);
- temp = left;
- left = right;
- right = temp;
+ if(get_mode_sign(conv_mode) != get_mode_sign(load_mode)) {
+ /* change the load if it has only 1 user */
+ if(get_irn_n_edges(pred) == 1) {
+ ir_mode *newmode;
+ if(get_mode_sign(conv_mode)) {
+ newmode = find_signed_mode(load_mode);
+ } else {
+ newmode = find_unsigned_mode(load_mode);
+ }
+ assert(newmode != NULL);
+ set_ia32_ls_mode(predpred, newmode);
+ } else {
+ /* otherwise we have to keep the conv */
+ return;
}
}
- base = left;
- index = noreg;
- offs = NULL;
- scale = 0;
- am_flav = 0;
-
- /* check for operation with immediate */
- if (is_ia32_ImmConst(irn)) {
- DBG((mod, LEVEL_1, "\tfound op with imm const"));
-
- offs_cnst = get_ia32_cnst(irn);
- dolea = 1;
- }
- else if (is_ia32_ImmSymConst(irn)) {
- DBG((mod, LEVEL_1, "\tfound op with imm symconst"));
-
- have_am_sc = 1;
- dolea = 1;
- am_sc = get_ia32_id_cnst(irn);
- am_sc_sign = is_ia32_am_sc_sign(irn);
- }
-
- /* determine the operand which needs to be checked */
- temp = be_is_NoReg(cg, right) ? left : right;
-
- /* check if right operand is AMConst (LEA with ia32_am_O) */
- /* but we can only eat it up if there is no other symconst */
- /* because the linker won't accept two symconsts */
- if (! have_am_sc && is_ia32_Lea(temp) && get_ia32_am_flavour(temp) == ia32_am_O) {
- DBG((mod, LEVEL_1, "\tgot op with LEA am_O"));
-
- offs_lea = get_ia32_am_offs(temp);
- am_sc = get_ia32_am_sc(temp);
- am_sc_sign = is_ia32_am_sc_sign(temp);
- have_am_sc = 1;
- dolea = 1;
- lea_o = temp;
-
- if (temp == base)
- base = noreg;
- }
-
- if (isadd) {
- /* default for add -> make right operand to index */
- index = right;
- dolea = 1;
-
- DBG((mod, LEVEL_1, "\tgot LEA candidate with index %+F\n", index));
-
- /* determine the operand which needs to be checked */
- temp = left;
- if (is_ia32_Lea(left)) {
- temp = right;
- }
+ /* kill the conv */
+ exchange(node, pred);
+}
- /* check for SHL 1,2,3 */
- if (pred_is_specific_node(temp, is_ia32_Shl)) {
- temp = get_Proj_pred(temp);
- shift = temp;
+static void optimize_conv_conv(ir_node *node)
+{
+ ir_node *pred_proj, *pred, *result_conv;
+ ir_mode *pred_mode, *conv_mode;
- if (get_ia32_Immop_tarval(temp)) {
- scale = get_tarval_long(get_ia32_Immop_tarval(temp));
+ if (!is_ia32_Conv_I2I(node) && !is_ia32_Conv_I2I8Bit(node))
+ return;
- if (scale <= 3) {
- index = get_irn_n(temp, 2);
+ assert(n_ia32_Conv_I2I_val == n_ia32_Conv_I2I8Bit_val);
+ pred_proj = get_irn_n(node, n_ia32_Conv_I2I_val);
+ if(is_Proj(pred_proj))
+ pred = get_Proj_pred(pred_proj);
+ else
+ pred = pred_proj;
- DBG((mod, LEVEL_1, "\tgot scaled index %+F\n", index));
- }
- else {
- scale = 0;
- shift = NULL;
- }
- }
- }
+ if(!is_ia32_Conv_I2I(pred) && !is_ia32_Conv_I2I8Bit(pred))
+ return;
- /* fix base */
- if (! be_is_NoReg(cg, index)) {
- /* if we have index, but left == right -> no base */
- if (left == right) {
- base = noreg;
+ /* we know that after a conv, the upper bits are sign extended
+ * so we only need the 2nd conv if it shrinks the mode */
+ conv_mode = get_ia32_ls_mode(node);
+ pred_mode = get_ia32_ls_mode(pred);
+ /* if 2nd conv is smaller then first conv, then we can always take the 2nd
+ * conv */
+ if(get_mode_size_bits(conv_mode) <= get_mode_size_bits(pred_mode)) {
+ if(get_irn_n_edges(pred_proj) == 1) {
+ result_conv = pred_proj;
+ set_ia32_ls_mode(pred, conv_mode);
+
+ /* Argh:We must change the opcode to 8bit AND copy the register constraints */
+ if (get_mode_size_bits(conv_mode) == 8) {
+ set_irn_op(pred, op_ia32_Conv_I2I8Bit);
+ set_ia32_in_req_all(pred, get_ia32_in_req_all(node));
}
- else if (! is_ia32_Lea(left) && (index != right)) {
- /* index != right -> we found a good Shl */
- /* left != LEA -> this Shl was the left operand */
- /* -> base is right operand */
- base = (right == lea_o) ? noreg : right;
+ } else {
+ /* TODO: construct syncs/stuff here but we'll probably end up with
+ * 2 statements anyway */
+ if(get_irn_mode(pred) == mode_T) {
+ return;
}
- }
- }
-
- /* Try to assimilate a LEA as left operand */
- if (is_ia32_Lea(left) && (get_ia32_am_flavour(left) != ia32_am_O)) {
- /* check if we can assimilate the LEA */
- int take_attr = do_new_lea(irn, base, index, left, have_am_sc, cg);
- if (take_attr == IA32_LEA_ATTR_NONE) {
- DBG((mod, LEVEL_1, "\tleave old LEA, creating new one\n"));
- }
- else {
- DBG((mod, LEVEL_1, "\tgot LEA as left operand ... assimilating\n"));
- lea = left; /* for statistics */
-
- if (take_attr & IA32_LEA_ATTR_OFFS)
- offs = get_ia32_am_offs(left);
+ result_conv = exact_copy(pred);
+ set_ia32_ls_mode(result_conv, conv_mode);
- if (take_attr & IA32_LEA_ATTR_AMSC) {
- am_sc = get_ia32_am_sc(left);
- have_am_sc = 1;
- am_sc_sign = is_ia32_am_sc_sign(left);
+ /* Argh:We must change the opcode to 8bit AND copy the register constraints */
+ if (get_mode_size_bits(conv_mode) == 8) {
+ set_irn_op(result_conv, op_ia32_Conv_I2I8Bit);
+ set_ia32_in_req_all(result_conv, get_ia32_in_req_all(node));
}
-
- if (take_attr & IA32_LEA_ATTR_SCALE)
- scale = get_ia32_am_scale(left);
-
- if (take_attr & IA32_LEA_ATTR_BASE)
- base = get_irn_n(left, 0);
-
- if (take_attr & IA32_LEA_ATTR_INDEX)
- index = get_irn_n(left, 1);
-
- if (take_attr & IA32_LEA_ATTR_FENT)
- lea_ent = get_ia32_frame_ent(left);
}
- }
-
- /* ok, we can create a new LEA */
- if (dolea) {
- res = new_rd_ia32_Lea(dbg, irg, block, base, index, mode_Is);
-
- /* add the old offset of a previous LEA */
- if (offs) {
- add_ia32_am_offs(res, offs);
- }
-
- /* add the new offset */
- if (isadd) {
- if (offs_cnst) {
- add_ia32_am_offs(res, offs_cnst);
- }
- if (offs_lea) {
- add_ia32_am_offs(res, offs_lea);
+ } else {
+ /* if both convs have the same sign, then we can take the smaller one */
+ if(get_mode_sign(conv_mode) == get_mode_sign(pred_mode)) {
+ result_conv = pred_proj;
+ } else {
+ /* no optimisation possible if smaller conv is sign-extend */
+ if(mode_is_signed(pred_mode)) {
+ return;
}
+ /* we can take the smaller conv if it is unsigned */
+ result_conv = pred_proj;
}
- else {
- /* either lea_O-cnst, -cnst or -lea_O */
- if (offs_cnst) {
- if (offs_lea) {
- add_ia32_am_offs(res, offs_lea);
- }
-
- sub_ia32_am_offs(res, offs_cnst);
- }
- else {
- sub_ia32_am_offs(res, offs_lea);
- }
- }
-
- /* set the address mode symconst */
- if (have_am_sc) {
- set_ia32_am_sc(res, am_sc);
- if (am_sc_sign)
- set_ia32_am_sc_sign(res);
- }
-
- /* copy the frame entity (could be set in case of Add */
- /* which was a FrameAddr) */
- if (lea_ent)
- set_ia32_frame_ent(res, lea_ent);
- else
- set_ia32_frame_ent(res, get_ia32_frame_ent(irn));
-
- if (get_ia32_frame_ent(res))
- set_ia32_use_frame(res);
-
- /* set scale */
- set_ia32_am_scale(res, scale);
-
- am_flav = ia32_am_N;
- /* determine new am flavour */
- if (offs || offs_cnst || offs_lea || have_am_sc) {
- am_flav |= ia32_O;
- }
- if (! be_is_NoReg(cg, base)) {
- am_flav |= ia32_B;
- }
- if (! be_is_NoReg(cg, index)) {
- am_flav |= ia32_I;
- }
- if (scale > 0) {
- am_flav |= ia32_S;
- }
- set_ia32_am_flavour(res, am_flav);
-
- set_ia32_op_type(res, ia32_AddrModeS);
-
- SET_IA32_ORIG_NODE(res, ia32_get_old_node_name(cg, irn));
-
- DBG((mod, LEVEL_1, "\tLEA [%+F + %+F * %d + %s]\n", base, index, scale, get_ia32_am_offs(res)));
-
- /* we will exchange it, report here before the Proj is created */
- if (shift && lea && lea_o)
- DBG_OPT_LEA4(irn, lea_o, lea, shift, res);
- else if (shift && lea)
- DBG_OPT_LEA3(irn, lea, shift, res);
- else if (shift && lea_o)
- DBG_OPT_LEA3(irn, lea_o, shift, res);
- else if (lea && lea_o)
- DBG_OPT_LEA3(irn, lea_o, lea, res);
- else if (shift)
- DBG_OPT_LEA2(irn, shift, res);
- else if (lea)
- DBG_OPT_LEA2(irn, lea, res);
- else if (lea_o)
- DBG_OPT_LEA2(irn, lea_o, res);
- else
- DBG_OPT_LEA1(irn, res);
-
- /* get the result Proj of the Add/Sub */
- irn = get_res_proj(irn);
-
- assert(irn && "Couldn't find result proj");
-
- /* exchange the old op with the new LEA */
- exchange(irn, res);
}
- return res;
-}
-
-
-/**
- * Merges a Load/Store node with a LEA.
- * @param irn The Load/Store node
- * @param lea The LEA
- */
-static void merge_loadstore_lea(ir_node *irn, ir_node *lea) {
- entity *irn_ent = get_ia32_frame_ent(irn);
- entity *lea_ent = get_ia32_frame_ent(lea);
+ /* kill the conv */
+ exchange(node, result_conv);
- /* If the irn and the LEA both have a different frame entity set: do not merge */
- if (irn_ent && lea_ent && (irn_ent != lea_ent))
- return;
- else if (! irn_ent && lea_ent) {
- set_ia32_frame_ent(irn, lea_ent);
- set_ia32_use_frame(irn);
+ if(get_irn_n_edges(pred) == 0) {
+ be_kill_node(pred);
}
-
- /* get the AM attributes from the LEA */
- add_ia32_am_offs(irn, get_ia32_am_offs(lea));
- set_ia32_am_scale(irn, get_ia32_am_scale(lea));
- set_ia32_am_flavour(irn, get_ia32_am_flavour(lea));
-
- set_ia32_am_sc(irn, get_ia32_am_sc(lea));
- if (is_ia32_am_sc_sign(lea))
- set_ia32_am_sc_sign(irn);
-
- set_ia32_op_type(irn, is_ia32_Ld(irn) ? ia32_AddrModeS : ia32_AddrModeD);
-
- /* set base and index */
- set_irn_n(irn, 0, get_irn_n(lea, 0));
- set_irn_n(irn, 1, get_irn_n(lea, 1));
-
- /* clear remat flag */
- set_ia32_flags(irn, get_ia32_flags(irn) & ~arch_irn_flags_rematerializable);
-
- if (is_ia32_Ld(irn))
- DBG_OPT_LOAD_LEA(lea, irn);
- else
- DBG_OPT_STORE_LEA(lea, irn);
-
-}
-
-/**
- * Sets new_right index of irn to right and new_left index to left.
- * Also exchange left and right
- */
-static void exchange_left_right(ir_node *irn, ir_node **left, ir_node **right, int new_left, int new_right) {
- ir_node *temp;
-
- set_irn_n(irn, new_right, *right);
- set_irn_n(irn, new_left, *left);
-
- temp = *left;
- *left = *right;
- *right = temp;
-
- /* this is only needed for Compares, but currently ALL nodes
- * have this attribute :-) */
- set_ia32_pncode(irn, get_inversed_pnc(get_ia32_pncode(irn)));
+ optimize_conv_conv(result_conv);
}
-/**
- * Performs address calculation optimization (create LEAs if possible)
- */
-static void optimize_lea(ir_node *irn, void *env) {
- ia32_code_gen_t *cg = env;
- ir_node *block, *noreg_gp, *left, *right;
-
- if (! is_ia32_irn(irn))
- return;
+static void optimize_node(ir_node *node, void *env)
+{
+ (void) env;
- /* Following cases can occur: */
- /* - Sub (l, imm) -> LEA [base - offset] */
- /* - Sub (l, r == LEA with ia32_am_O) -> LEA [base - offset] */
- /* - Add (l, imm) -> LEA [base + offset] */
- /* - Add (l, r == LEA with ia32_am_O) -> LEA [base + offset] */
- /* - Add (l == LEA with ia32_am_O, r) -> LEA [base + offset] */
- /* - Add (l, r) -> LEA [base + index * scale] */
- /* with scale > 1 iff l/r == shl (1,2,3) */
-
- if (is_ia32_Sub(irn) || is_ia32_Add(irn)) {
- left = get_irn_n(irn, 2);
- right = get_irn_n(irn, 3);
- block = get_nodes_block(irn);
- noreg_gp = ia32_new_NoReg_gp(cg);
-
- /* Do not try to create a LEA if one of the operands is a Load. */
- /* check is irn is a candidate for address calculation */
- if (is_addr_candidate(block, irn)) {
- ir_node *res;
-
- DBG((cg->mod, LEVEL_1, "\tfound address calculation candidate %+F ... ", irn));
- res = fold_addr(cg, irn, noreg_gp);
-
- if (res != irn)
- DB((cg->mod, LEVEL_1, "transformed into %+F\n", res));
- else
- DB((cg->mod, LEVEL_1, "not transformed\n"));
- }
- }
- else if (is_ia32_Ld(irn) || is_ia32_St(irn) || is_ia32_Store8Bit(irn)) {
- /* - Load -> LEA into Load } TODO: If the LEA is used by more than one Load/Store */
- /* - Store -> LEA into Store } it might be better to keep the LEA */
- left = get_irn_n(irn, 0);
-
- if (is_ia32_Lea(left)) {
- const ir_edge_t *edge, *ne;
- ir_node *src;
-
- /* merge all Loads/Stores connected to this LEA with the LEA */
- foreach_out_edge_safe(left, edge, ne) {
- src = get_edge_src_irn(edge);
-
- if (src && (is_ia32_Ld(src) || is_ia32_St(src) || is_ia32_Store8Bit(src))) {
- DBG((cg->mod, LEVEL_1, "\nmerging %+F into %+F\n", left, irn));
- if (! is_ia32_got_lea(src))
- merge_loadstore_lea(src, left);
- set_ia32_got_lea(src);
- }
- }
- }
- }
+ optimize_load_conv(node);
+ optimize_conv_store(node);
+ optimize_conv_conv(node);
}
-
/**
- * Checks for address mode patterns and performs the
- * necessary transformations.
- * This function is called by a walker.
+ * Performs conv and address mode optimization.
*/
-static void optimize_am(ir_node *irn, void *env) {
- ia32_am_opt_env_t *am_opt_env = env;
- ia32_code_gen_t *cg = am_opt_env->cg;
- heights_t *h = am_opt_env->h;
- ir_node *block, *noreg_gp, *noreg_fp;
- ir_node *left, *right;
- ir_node *store, *load, *mem_proj;
- ir_node *succ, *addr_b, *addr_i;
- int check_am_src = 0;
- int need_exchange_on_fail = 0;
- DEBUG_ONLY(firm_dbg_module_t *mod = cg->mod;)
-
- if (! is_ia32_irn(irn))
- return;
-
- block = get_nodes_block(irn);
- noreg_gp = ia32_new_NoReg_gp(cg);
- noreg_fp = ia32_new_NoReg_fp(cg);
-
- DBG((mod, LEVEL_1, "checking for AM\n"));
-
- /* fold following patterns: */
- /* - op -> Load into AMop with am_Source */
- /* conditions: */
- /* - op is am_Source capable AND */
- /* - the Load is only used by this op AND */
- /* - the Load is in the same block */
- /* - Store -> op -> Load into AMop with am_Dest */
- /* conditions: */
- /* - op is am_Dest capable AND */
- /* - the Store uses the same address as the Load AND */
- /* - the Load is only used by this op AND */
- /* - the Load and Store are in the same block AND */
- /* - nobody else uses the result of the op */
-
- if ((get_ia32_am_support(irn) != ia32_am_None) && ! is_ia32_Lea(irn)) {
- ia32_am_cand_t cand = is_am_candidate(h, block, irn);
- ia32_am_cand_t orig_cand = cand;
-
- /* cand == 1: load is left; cand == 2: load is right; */
-
- if (cand == IA32_AM_CAND_NONE)
- return;
-
- DBG((mod, LEVEL_1, "\tfound address mode candidate %+F ... ", irn));
-
- left = get_irn_n(irn, 2);
- if (get_irn_arity(irn) == 4) {
- /* it's an "unary" operation */
- right = left;
- }
- else {
- right = get_irn_n(irn, 3);
- }
-
- /* normalize commutative ops */
- if (node_is_ia32_comm(irn) && (cand == IA32_AM_CAND_LEFT)) {
-
- /* Assure that right operand is always a Load if there is one */
- /* because non-commutative ops can only use Dest AM if the right */
- /* operand is a load, so we only need to check right operand. */
-
- exchange_left_right(irn, &left, &right, 3, 2);
- need_exchange_on_fail = 1;
-
- /* now: load is right */
- cand = IA32_AM_CAND_RIGHT;
- }
-
- /* check for Store -> op -> Load */
-
- /* Store -> op -> Load optimization is only possible if supported by op */
- /* and if right operand is a Load */
- if ((get_ia32_am_support(irn) & ia32_am_Dest) && (cand & IA32_AM_CAND_RIGHT))
- {
- /* An address mode capable op always has a result Proj. */
- /* If this Proj is used by more than one other node, we don't need to */
- /* check further, otherwise we check for Store and remember the address, */
- /* the Store points to. */
-
- succ = get_res_proj(irn);
- assert(succ && "Couldn't find result proj");
-
- addr_b = NULL;
- addr_i = NULL;
- store = NULL;
-
- /* now check for users and Store */
- if (ia32_get_irn_n_edges(succ) == 1) {
- succ = get_edge_src_irn(get_irn_out_edge_first(succ));
-
- if (is_ia32_xStore(succ) || is_ia32_Store(succ)) {
- store = succ;
- addr_b = get_irn_n(store, 0);
- addr_i = get_irn_n(store, 1);
- }
- }
-
- if (store) {
- /* we found a Store as single user: Now check for Load */
-
- /* Extra check for commutative ops with two Loads */
- /* -> put the interesting Load right */
- if (node_is_ia32_comm(irn) && (cand == IA32_AM_CAND_BOTH)) {
- if ((addr_b == get_irn_n(get_Proj_pred(left), 0)) &&
- (addr_i == get_irn_n(get_Proj_pred(left), 1)))
- {
- /* We exchange left and right, so it's easier to kill */
- /* the correct Load later and to handle unary operations. */
- exchange_left_right(irn, &left, &right, 3, 2);
- need_exchange_on_fail ^= 1;
- }
- }
-
- /* skip the Proj for easier access */
- load = get_Proj_pred(right);
-
- /* Compare Load and Store address */
- if (load_store_addr_is_equal(load, store, addr_b, addr_i)) {
- /* Right Load is from same address, so we can */
- /* disconnect the Load and Store here */
-
- /* set new base, index and attributes */
- set_irn_n(irn, 0, addr_b);
- set_irn_n(irn, 1, addr_i);
- add_ia32_am_offs(irn, get_ia32_am_offs(load));
- set_ia32_am_scale(irn, get_ia32_am_scale(load));
- set_ia32_am_flavour(irn, get_ia32_am_flavour(load));
- set_ia32_op_type(irn, ia32_AddrModeD);
- set_ia32_frame_ent(irn, get_ia32_frame_ent(load));
- set_ia32_ls_mode(irn, get_ia32_ls_mode(load));
-
- set_ia32_am_sc(irn, get_ia32_am_sc(load));
- if (is_ia32_am_sc_sign(load))
- set_ia32_am_sc_sign(irn);
-
- if (is_ia32_use_frame(load))
- set_ia32_use_frame(irn);
-
- /* connect to Load memory and disconnect Load */
- if (get_irn_arity(irn) == 5) {
- /* binary AMop */
- set_irn_n(irn, 4, get_irn_n(load, 2));
- set_irn_n(irn, 3, noreg_gp);
- }
- else {
- /* unary AMop */
- set_irn_n(irn, 3, get_irn_n(load, 2));
- set_irn_n(irn, 2, noreg_gp);
- }
-
- /* connect the memory Proj of the Store to the op */
- mem_proj = get_mem_proj(store);
- set_Proj_pred(mem_proj, irn);
- set_Proj_proj(mem_proj, 1);
-
- /* clear remat flag */
- set_ia32_flags(irn, get_ia32_flags(irn) & ~arch_irn_flags_rematerializable);
-
- DBG_OPT_AM_D(load, store, irn);
-
- DB((mod, LEVEL_1, "merged with %+F and %+F into dest AM\n", load, store));
-
- need_exchange_on_fail = 0;
- }
- } /* if (store) */
- else if (get_ia32_am_support(irn) & ia32_am_Source) {
- /* There was no store, check if we still can optimize for source address mode */
- check_am_src = 1;
- }
- } /* if (support AM Dest) */
- else if (get_ia32_am_support(irn) & ia32_am_Source) {
- /* op doesn't support am AM Dest -> check for AM Source */
- check_am_src = 1;
- }
-
- /* was exchanged but optimize failed: exchange back */
- if (need_exchange_on_fail) {
- exchange_left_right(irn, &left, &right, 3, 2);
- cand = orig_cand;
- }
-
- need_exchange_on_fail = 0;
-
- /* normalize commutative ops */
- if (check_am_src && node_is_ia32_comm(irn) && (cand == IA32_AM_CAND_RIGHT)) {
-
- /* Assure that left operand is always a Load if there is one */
- /* because non-commutative ops can only use Source AM if the */
- /* left operand is a Load, so we only need to check the left */
- /* operand afterwards. */
-
- exchange_left_right(irn, &left, &right, 3, 2);
- need_exchange_on_fail = 1;
-
- /* now: load is left */
- cand = IA32_AM_CAND_LEFT;
- }
-
- /* optimize op -> Load iff Load is only used by this op */
- /* and left operand is a Load which only used by this irn */
- if (check_am_src &&
- (cand & IA32_AM_CAND_LEFT) &&
- (ia32_get_irn_n_edges(left) == 1))
- {
- left = get_Proj_pred(left);
-
- addr_b = get_irn_n(left, 0);
- addr_i = get_irn_n(left, 1);
-
- /* set new base, index and attributes */
- set_irn_n(irn, 0, addr_b);
- set_irn_n(irn, 1, addr_i);
- add_ia32_am_offs(irn, get_ia32_am_offs(left));
- set_ia32_am_scale(irn, get_ia32_am_scale(left));
- set_ia32_am_flavour(irn, get_ia32_am_flavour(left));
- set_ia32_op_type(irn, ia32_AddrModeS);
- set_ia32_frame_ent(irn, get_ia32_frame_ent(left));
- set_ia32_ls_mode(irn, get_ia32_ls_mode(left));
-
- set_ia32_am_sc(irn, get_ia32_am_sc(left));
- if (is_ia32_am_sc_sign(left))
- set_ia32_am_sc_sign(irn);
-
- /* clear remat flag */
- set_ia32_flags(irn, get_ia32_flags(irn) & ~arch_irn_flags_rematerializable);
-
- if (is_ia32_use_frame(left))
- set_ia32_use_frame(irn);
-
- /* connect to Load memory */
- if (get_irn_arity(irn) == 5) {
- /* binary AMop */
- set_irn_n(irn, 4, get_irn_n(left, 2));
-
- /* this is only needed for Compares, but currently ALL nodes
- * have this attribute :-) */
- set_ia32_pncode(irn, get_inversed_pnc(get_ia32_pncode(irn)));
-
- /* disconnect from Load */
- /* (make second op -> first, set second in to noreg) */
- set_irn_n(irn, 2, get_irn_n(irn, 3));
- set_irn_n(irn, 3, noreg_gp);
- }
- else {
- /* unary AMop */
- set_irn_n(irn, 3, get_irn_n(left, 2));
-
- /* disconnect from Load */
- set_irn_n(irn, 2, noreg_gp);
- }
-
- DBG_OPT_AM_S(left, irn);
-
- /* If Load has a memory Proj, connect it to the op */
- mem_proj = get_mem_proj(left);
- if (mem_proj) {
- set_Proj_pred(mem_proj, irn);
- set_Proj_proj(mem_proj, 1);
- }
+void ia32_optimize_graph(ia32_code_gen_t *cg)
+{
+ irg_walk_blkwise_graph(cg->irg, NULL, optimize_node, cg);
- DB((mod, LEVEL_1, "merged with %+F into source AM\n", left));
- }
- else {
- /* was exchanged but optimize failed: exchange back */
- if (need_exchange_on_fail)
- exchange_left_right(irn, &left, &right, 3, 2);
- }
- }
+ if (cg->dump)
+ be_dump(cg->irg, "-opt", dump_ir_block_graph_sched);
}
-/**
- * Performs address mode optimization.
- */
-void ia32_optimize_addressmode(ia32_code_gen_t *cg) {
- /* if we are supposed to do AM or LEA optimization: recalculate edges */
- if (cg->opt & (IA32_OPT_DOAM | IA32_OPT_LEA)) {
- edges_deactivate(cg->irg);
- edges_activate(cg->irg);
- }
- else {
- /* no optimizations at all */
- return;
- }
-
- /* beware: we cannot optimize LEA and AM in one run because */
- /* LEA optimization adds new nodes to the irg which */
- /* invalidates the phase data */
-
- if (cg->opt & IA32_OPT_LEA) {
- irg_walk_blkwise_graph(cg->irg, NULL, optimize_lea, cg);
- }
-
- if (cg->opt & IA32_OPT_DOAM) {
- /* we need height information for am optimization */
- heights_t *h = heights_new(cg->irg);
- ia32_am_opt_env_t env;
-
- env.cg = cg;
- env.h = h;
-
- irg_walk_blkwise_graph(cg->irg, NULL, optimize_am, &env);
-
- heights_free(h);
- }
+void ia32_init_optimize(void)
+{
+ FIRM_DBG_REGISTER(dbg, "firm.be.ia32.optimize");
}