* @file
* @brief Peephole optimization and legalization of a sparc function
* @author Matthias Braun
- * @version $Id$
*
* A note on sparc stackpointer (sp) behaviour:
* The ABI expects SPARC_MIN_STACKSIZE bytes to be available at the
#include "irgmod.h"
#include "ircons.h"
#include "irgwalk.h"
-
+#include "heights.h"
+#include "beirg.h"
#include "bepeephole.h"
#include "benode.h"
#include "besched.h"
#include "bestack.h"
#include "beirgmod.h"
+static ir_heights_t *heights;
+
static void kill_unused_stacknodes(ir_node *node)
{
if (get_irn_n_edges(node) > 0)
static void introduce_epilog(ir_node *ret)
{
- const arch_register_t *sp_reg = &sparc_registers[REG_SP];
- ir_graph *irg = get_irn_irg(ret);
- be_stack_layout_t *layout = be_get_irg_stack_layout(irg);
- ir_node *block = get_nodes_block(ret);
- ir_type *frame_type = get_irg_frame_type(irg);
- unsigned frame_size = get_type_size_bytes(frame_type);
- int sp_idx = be_find_return_reg_input(ret, sp_reg);
- ir_node *sp = get_irn_n(ret, sp_idx);
+ arch_register_t const *const sp_reg = &sparc_registers[REG_SP];
+ assert(arch_get_irn_register_req_in(ret, n_sparc_Return_sp) == sp_reg->single_req);
+ ir_node *const sp = get_irn_n(ret, n_sparc_Return_sp);
+ ir_node *const block = get_nodes_block(ret);
+ ir_graph *const irg = get_irn_irg(ret);
+ be_stack_layout_t *const layout = be_get_irg_stack_layout(irg);
if (!layout->sp_relative) {
- const arch_register_t *fp_reg = &sparc_registers[REG_FRAME_POINTER];
- ir_node *fp = be_get_initial_reg_value(irg, fp_reg);
- ir_node *restore = new_bd_sparc_RestoreZero(NULL, block, fp);
+ arch_register_t const *const fp_reg = &sparc_registers[REG_FRAME_POINTER];
+ ir_node *const fp = be_get_initial_reg_value(irg, fp_reg);
+ ir_node *const new_sp = be_get_initial_reg_value(irg, sp_reg);
+ ir_node *const restore = new_bd_sparc_RestoreZero(NULL, block, new_sp, fp);
sched_add_before(ret, restore);
arch_set_irn_register(restore, sp_reg);
- set_irn_n(ret, sp_idx, restore);
-
+ set_irn_n(ret, n_sparc_Return_sp, restore);
kill_unused_stacknodes(sp);
} else {
- ir_node *incsp = be_new_IncSP(sp_reg, block, sp, -frame_size, 0);
- set_irn_n(ret, sp_idx, incsp);
+ ir_type *const frame_type = get_irg_frame_type(irg);
+ unsigned const frame_size = get_type_size_bytes(frame_type);
+ ir_node *const incsp = be_new_IncSP(sp_reg, block, sp, -frame_size, 0);
+ set_irn_n(ret, n_sparc_Return_sp, incsp);
sched_add_before(ret, incsp);
}
}
be_stack_layout_t *layout = be_get_irg_stack_layout(irg);
ir_node *block = get_nodes_block(start);
ir_node *initial_sp = be_get_initial_reg_value(irg, sp_reg);
- ir_node *sp = initial_sp;
ir_node *schedpoint = start;
ir_type *frame_type = get_irg_frame_type(irg);
unsigned frame_size = get_type_size_bytes(frame_type);
schedpoint = sched_next(schedpoint);
if (!layout->sp_relative) {
- ir_node *save = new_bd_sparc_Save_imm(NULL, block, sp, NULL,
- -SPARC_MIN_STACKSIZE-frame_size);
+ ir_node *const save = new_bd_sparc_Save_imm(NULL, block, initial_sp, NULL, -(SPARC_MIN_STACKSIZE + frame_size));
arch_set_irn_register(save, sp_reg);
sched_add_after(schedpoint, save);
schedpoint = save;
- edges_reroute(initial_sp, save);
- set_irn_n(save, n_sparc_Save_stack, initial_sp);
+ edges_reroute_except(initial_sp, save, save);
/* we still need the Save even if noone is explicitely using the
* value. (TODO: this isn't 100% correct yet, something at the end of
sched_add_after(schedpoint, keep);
}
} else {
- ir_node *incsp = be_new_IncSP(sp_reg, block, sp, frame_size, 0);
- edges_reroute(initial_sp, incsp);
- be_set_IncSP_pred(incsp, sp);
+ ir_node *const incsp = be_new_IncSP(sp_reg, block, initial_sp, frame_size, 0);
+ edges_reroute_except(initial_sp, incsp, incsp);
sched_add_after(schedpoint, incsp);
}
}
sched_add_before(node, new_frameaddr);
arch_set_irn_register(new_frameaddr, reg);
- exchange(node, new_frameaddr);
+ be_peephole_exchange(node, new_frameaddr);
}
}
ir_node *constant = create_constant_from_immediate(node, offset);
ir_node *new_load = new_bd_sparc_Ld_reg(dbgi, block, ptr, constant, mem, load_store_mode);
sparc_load_store_attr_t *new_load_attr = get_sparc_load_store_attr(new_load);
- unsigned n_outs = arch_get_irn_n_outs(node);
- unsigned i;
new_load_attr->is_frame_entity = load_store_attr->is_frame_entity;
new_load_attr->is_reg_reg = load_store_attr->is_reg_reg;
sched_add_before(node, new_load);
- for (i = 0; i < n_outs; i++) {
+ be_foreach_out(node, i) {
arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
}
- exchange(node, new_load);
+ be_peephole_exchange(node, new_load);
}
}
+static void split_sparc_ldf(ir_node *node)
+{
+ sparc_load_store_attr_t *attr = get_sparc_load_store_attr(node);
+ unsigned bits = get_mode_size_bits(attr->load_store_mode);
+ /* split 128bit loads into 2 64bit loads */
+ if (bits == 128) {
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_node *block = get_nodes_block(node);
+ ir_node *ptr = get_irn_n(node, n_sparc_Ldf_ptr);
+ ir_node *mem = get_irn_n(node, n_sparc_Ldf_mem);
+ ir_node *new_load
+ = new_bd_sparc_Ldf_d(dbgi, block, ptr, mem, mode_D,
+ attr->base.immediate_value_entity,
+ attr->base.immediate_value + 8,
+ attr->is_frame_entity);
+ ir_node *new_mem = new_r_Proj(new_load, mode_M, pn_sparc_Ldf_M);
+
+ const arch_register_t *reg
+ = arch_get_irn_register_out(node, pn_sparc_Ldf_res);
+ unsigned reg_index = reg->global_index;
+
+ arch_set_irn_register_out(new_load, pn_sparc_Ldf_res,
+ &sparc_registers[reg_index+2]);
+
+ attr->load_store_mode = mode_D;
+ set_irn_n(node, n_sparc_Ldf_mem, new_mem);
+ sched_add_before(node, new_load);
+ }
+}
+
static void finish_sparc_Ldf(ir_node *node)
{
sparc_attr_t *attr = get_sparc_attr(node);
ir_node *new_ptr = new_bd_sparc_Add_reg(dbgi, block, ptr, constant);
ir_node *new_load = new_bd_sparc_Ldf_s(dbgi, block, new_ptr, mem, load_store_mode, NULL, 0, true);
sparc_load_store_attr_t *new_load_attr = get_sparc_load_store_attr(new_load);
- unsigned n_outs = arch_get_irn_n_outs(node);
- unsigned i;
new_load_attr->is_frame_entity = load_store_attr->is_frame_entity;
new_load_attr->is_reg_reg = load_store_attr->is_reg_reg;
sched_add_before(node, new_load);
- for (i = 0; i < n_outs; i++) {
+ be_foreach_out(node, i) {
arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
}
- exchange(node, new_load);
+ be_peephole_exchange(node, new_load);
}
}
ir_node *constant = create_constant_from_immediate(node, offset);
ir_node *new_load = new_bd_sparc_St_reg(dbgi, block, value, ptr, constant, mem, load_store_mode);
sparc_load_store_attr_t *new_load_attr = get_sparc_load_store_attr(new_load);
- unsigned n_outs = arch_get_irn_n_outs(node);
- unsigned i;
new_load_attr->is_frame_entity = load_store_attr->is_frame_entity;
new_load_attr->is_reg_reg = load_store_attr->is_reg_reg;
sched_add_before(node, new_load);
- for (i = 0; i < n_outs; i++) {
+ be_foreach_out(node, i) {
arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
}
- exchange(node, new_load);
+ be_peephole_exchange(node, new_load);
}
}
ir_node *new_ptr = new_bd_sparc_Add_reg(dbgi, block, ptr, constant);
ir_node *new_load = new_bd_sparc_Stf_s(dbgi, block, value, new_ptr, mem, load_store_mode, NULL, 0, true);
sparc_load_store_attr_t *new_load_attr = get_sparc_load_store_attr(new_load);
- unsigned n_outs = arch_get_irn_n_outs(node);
- unsigned i;
new_load_attr->is_frame_entity = load_store_attr->is_frame_entity;
new_load_attr->is_reg_reg = load_store_attr->is_reg_reg;
sched_add_before(node, new_load);
- for (i = 0; i < n_outs; i++) {
+ be_foreach_out(node, i) {
arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
}
- exchange(node, new_load);
+ be_peephole_exchange(node, new_load);
}
}
(void) node;
}
+/* output must not be local, or out reg. Since the destination of the restore
+ * is the rotated register-file where only the old in-registers are still
+ * visible (as out-registers) */
static bool is_restorezeroopt_reg(const arch_register_t *reg)
{
unsigned index = reg->global_index;
|| (index >= REG_I0 && index <= REG_I7);
}
+static void replace_with_restore_reg(ir_node *node, ir_node *replaced,
+ ir_node *op0, ir_node *op1)
+{
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_node *stack_in = get_irn_n(node, n_sparc_RestoreZero_stack);
+ ir_node *fp = get_irn_n(node, n_sparc_RestoreZero_frame_pointer);
+ ir_node *block = get_nodes_block(node);
+ ir_mode *mode = get_irn_mode(node);
+ ir_node *new_node = new_bd_sparc_Restore_reg(dbgi, block, stack_in, fp,
+ op0, op1);
+ ir_node *stack = new_r_Proj(new_node, mode, pn_sparc_Restore_stack);
+ ir_node *res = new_r_Proj(new_node, mode, pn_sparc_Restore_res);
+ const arch_register_t *reg = arch_get_irn_register(replaced);
+ const arch_register_t *sp = &sparc_registers[REG_SP];
+ arch_set_irn_register_out(new_node, pn_sparc_Restore_stack, sp);
+ arch_set_irn_register_out(new_node, pn_sparc_Restore_res, reg);
+
+ sched_add_before(node, new_node);
+ be_peephole_exchange(node, stack);
+ be_peephole_exchange(replaced, res);
+}
+
+static void replace_with_restore_imm(ir_node *node, ir_node *replaced,
+ ir_node *op, ir_entity *imm_entity,
+ int32_t immediate)
+{
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_node *stack_in = get_irn_n(node, n_sparc_RestoreZero_stack);
+ ir_node *fp = get_irn_n(node, n_sparc_RestoreZero_frame_pointer);
+ ir_node *block = get_nodes_block(node);
+ ir_mode *mode = get_irn_mode(node);
+ ir_node *new_node = new_bd_sparc_Restore_imm(dbgi, block, stack_in, fp,
+ op, imm_entity, immediate);
+ ir_node *stack = new_r_Proj(new_node, mode, pn_sparc_Restore_stack);
+ ir_node *res = new_r_Proj(new_node, mode, pn_sparc_Restore_res);
+ const arch_register_t *reg = arch_get_irn_register(replaced);
+ const arch_register_t *sp = &sparc_registers[REG_SP];
+ arch_set_irn_register_out(new_node, pn_sparc_Restore_stack, sp);
+ arch_set_irn_register_out(new_node, pn_sparc_Restore_res, reg);
+
+ sched_add_before(node, new_node);
+ be_peephole_exchange(node, stack);
+ be_peephole_exchange(replaced, res);
+}
+
static void peephole_sparc_RestoreZero(ir_node *node)
{
/* restore gives us a free "add" instruction, let's try to use that to fold
- * an instruction in */
- ir_node *try = sched_prev(node);
-
- /* output must not be local, or out reg (it would be strange though if
- * they were) */
- if (be_is_Copy(try)) {
- dbg_info *dbgi;
- ir_node *block;
- ir_node *new_restore;
- ir_node *op;
- ir_node *fp;
- ir_node *res;
- ir_node *stack;
- ir_mode *mode;
-
- const arch_register_t *reg = arch_get_irn_register(try);
- if (!is_restorezeroopt_reg(reg))
- return;
+ * an instruction in. We can do the following:
+ *
+ * - Copy values (g0 + reg)
+ * - Produce constants (g0 + immediate)
+ * - Perform an add (reg + reg)
+ * - Perform a sub with immediate (reg + (-immediate))
+ *
+ * Note: In an ideal world, this would not be a peephole optimization but
+ * already performed during code selection. Since about all foldable ops are
+ * arguments of the return node. However we have a hard time doing this
+ * since we construct epilogue code only after register allocation
+ * (and therefore after code selection).
+ */
+ int n_tries = 10; /* limit our search */
+
+ for (ir_node *schedpoint = node;;) {
+ const arch_register_t *reg;
+ schedpoint = sched_prev(schedpoint);
+ if (sched_is_begin(schedpoint))
+ break;
- op = get_irn_n(try, n_be_Copy_op);
- fp = get_irn_n(node, n_sparc_RestoreZero_frame_pointer);
- dbgi = get_irn_dbg_info(node);
- block = get_nodes_block(node);
- new_restore = new_bd_sparc_Restore_imm(dbgi, block, fp, op, NULL, 0);
- arch_set_irn_register_out(new_restore, pn_sparc_Restore_stack,
- &sparc_registers[REG_SP]);
- arch_set_irn_register_out(new_restore, pn_sparc_Restore_res,
- reg);
+ if (--n_tries == 0)
+ break;
- mode = get_irn_mode(node);
- stack = new_r_Proj(new_restore, mode, pn_sparc_Restore_stack);
- res = new_r_Proj(new_restore, mode, pn_sparc_Restore_res);
+ if (arch_get_irn_n_outs(schedpoint) == 0)
+ continue;
+
+ if (!mode_is_data(get_irn_mode(schedpoint)))
+ return;
- sched_add_before(node, new_restore);
- be_peephole_exchange(node, stack);
- be_peephole_exchange(try, res);
+ reg = arch_get_irn_register(schedpoint);
+ if (!is_restorezeroopt_reg(reg))
+ continue;
+
+ if (be_is_Copy(schedpoint) && be_can_move_down(heights, schedpoint, node)) {
+ ir_node *const op = be_get_Copy_op(schedpoint);
+ replace_with_restore_imm(node, schedpoint, op, NULL, 0);
+ } else if (is_sparc_Or(schedpoint) &&
+ arch_get_irn_flags(schedpoint) & ((arch_irn_flags_t)sparc_arch_irn_flag_immediate_form) &&
+ arch_get_irn_register_in(schedpoint, 0) == &sparc_registers[REG_G0] &&
+ be_can_move_down(heights, schedpoint, node)) {
+ /* it's a constant */
+ const sparc_attr_t *attr = get_sparc_attr_const(schedpoint);
+ ir_entity *entity = attr->immediate_value_entity;
+ int32_t immediate = attr->immediate_value;
+ ir_node *g0 = get_irn_n(schedpoint, 0);
+ replace_with_restore_imm(node, schedpoint, g0, entity, immediate);
+ } else if (is_sparc_Add(schedpoint) &&
+ be_can_move_down(heights, schedpoint, node)) {
+ if (arch_get_irn_flags(schedpoint) & ((arch_irn_flags_t)sparc_arch_irn_flag_immediate_form)) {
+ ir_node *op = get_irn_n(schedpoint, 0);
+ const sparc_attr_t *attr = get_sparc_attr_const(schedpoint);
+ ir_entity *entity = attr->immediate_value_entity;
+ int32_t imm = attr->immediate_value;
+ replace_with_restore_imm(node, schedpoint, op, entity, imm);
+ } else {
+ ir_node *op0 = get_irn_n(schedpoint, 0);
+ ir_node *op1 = get_irn_n(schedpoint, 1);
+ replace_with_restore_reg(node, schedpoint, op0, op1);
+ }
+ } else if (is_sparc_Sub(schedpoint) &&
+ arch_get_irn_flags(schedpoint) & ((arch_irn_flags_t)sparc_arch_irn_flag_immediate_form) &&
+ arch_get_irn_register_in(schedpoint, 0) == &sparc_registers[REG_G0] &&
+ be_can_move_down(heights, schedpoint, node)) {
+ /* it's a constant */
+ const sparc_attr_t *attr = get_sparc_attr_const(schedpoint);
+ ir_entity *entity = attr->immediate_value_entity;
+ int32_t imm = attr->immediate_value;
+ if (entity == NULL && sparc_is_value_imm_encodeable(-imm)) {
+ ir_node *g0 = get_irn_n(schedpoint, 0);
+ replace_with_restore_imm(node, schedpoint, g0, NULL, -imm);
+ } else {
+ continue;
+ }
+ }
+ /* when we're here then we performed a folding and are done */
+ return;
}
}
static void finish_sparc_Return(ir_node *node)
{
- ir_node *schedpoint = node;
- ir_node *restore;
- /* see that there is no code between Return and restore, if there is move
- * it in front of the restore */
- while (true) {
- if (!sched_has_prev(schedpoint))
- return;
- schedpoint = sched_prev(schedpoint);
- if (is_sparc_Restore(schedpoint) || is_sparc_RestoreZero(schedpoint))
+ /* Ensure that the restore is directly before the return. */
+ sched_foreach_reverse_from(sched_prev(node), restore) {
+ if (is_sparc_Restore(restore) || is_sparc_RestoreZero(restore)) {
+ sched_remove(restore);
+ sched_add_before(node, restore);
break;
- }
- restore = schedpoint;
- schedpoint = sched_prev(node);
- /* move all code between return and restore up */
- while (schedpoint != restore) {
- ir_node *next_schedpoint = sched_prev(schedpoint);
- sched_remove(schedpoint);
- sched_add_before(restore, schedpoint);
- schedpoint = next_schedpoint;
+ }
}
}
}
}
-void sparc_finish(ir_graph *irg)
+void sparc_finish_graph(ir_graph *irg)
{
be_stack_layout_t *stack_layout = be_get_irg_stack_layout(irg);
bool at_begin = stack_layout->sp_relative ? true : false;
irg_walk_graph(irg, NULL, sparc_collect_frame_entity_nodes, fec_env);
be_assign_entities(fec_env, sparc_set_frame_entity, at_begin);
be_free_frame_entity_coalescer(fec_env);
+ sparc_adjust_stack_entity_offsets(irg);
sparc_introduce_prolog_epilog(irg);
be_abi_fix_stack_nodes(irg);
sparc_fix_stack_bias(irg);
+ heights = heights_new(irg);
+
/* perform peephole optimizations */
- clear_irp_opcodes_generic_func();
+ ir_clear_opcodes_generic_func();
register_peephole_optimisation(op_be_IncSP, peephole_be_IncSP);
register_peephole_optimisation(op_sparc_FrameAddr, peephole_sparc_FrameAddr);
register_peephole_optimisation(op_sparc_RestoreZero,
peephole_sparc_RestoreZero);
+ register_peephole_optimisation(op_sparc_Ldf, split_sparc_ldf);
be_peephole_opt(irg);
/* perform legalizations (mostly fix nodes with too big immediates) */
- clear_irp_opcodes_generic_func();
+ ir_clear_opcodes_generic_func();
register_peephole_optimisation(op_be_IncSP, finish_be_IncSP);
register_peephole_optimisation(op_sparc_FrameAddr, finish_sparc_FrameAddr);
register_peephole_optimisation(op_sparc_Ld, finish_sparc_Ld);
register_peephole_optimisation(op_sparc_Stf, finish_sparc_Stf);
be_peephole_opt(irg);
+ heights_free(heights);
+
be_remove_dead_nodes_from_schedule(irg);
}
projects / libfirm / blobdiff