* @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 "../bepeephole.h"
-#include "../benode.h"
-#include "../besched.h"
-#include "../bespillslots.h"
-#include "../bestack.h"
-#include "../beirgmod.h"
+#include "bepeephole.h"
+#include "benode.h"
+#include "besched.h"
+#include "bespillslots.h"
+#include "bestack.h"
+#include "beirgmod.h"
+
+static ir_heights_t *heights;
static void kill_unused_stacknodes(ir_node *node)
{
}
/**
- * adjust sp-relative offsets. Split into multiple instructions if offset
- * exceeds SPARC immediate range.
+ * Adjust sp-relative offsets.
+ *
+ * Split into multiple instructions if offset exceeds SPARC immediate range.
*/
static void finish_sparc_FrameAddr(ir_node *node)
{
- /* adapt to SPARC stack magic */
sparc_attr_t *attr = get_sparc_attr(node);
int offset = attr->immediate_value;
}
}
+static void finish_sparc_Ld(ir_node *node)
+{
+ sparc_attr_t *attr = get_sparc_attr(node);
+ int offset = attr->immediate_value;
+ const sparc_load_store_attr_t *load_store_attr = get_sparc_load_store_attr_const(node);
+
+ if (! load_store_attr->is_frame_entity)
+ return;
+
+ if (! sparc_is_value_imm_encodeable(offset)) {
+ ir_node *ptr = get_irn_n(node, n_sparc_Ld_ptr);
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_node *block = get_nodes_block(node);
+ ir_node *mem = get_irn_n(node, n_sparc_Ld_mem);
+ ir_mode *load_store_mode = load_store_attr->load_store_mode;
+ 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++) {
+ arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
+ }
+ exchange(node, new_load);
+ }
+
+}
+
+static void finish_sparc_Ldf(ir_node *node)
+{
+ sparc_attr_t *attr = get_sparc_attr(node);
+ int offset = attr->immediate_value;
+ const sparc_load_store_attr_t *load_store_attr = get_sparc_load_store_attr_const(node);
+
+ if (! load_store_attr->is_frame_entity)
+ return;
+
+ if (! sparc_is_value_imm_encodeable(offset)) {
+ ir_node *ptr = get_irn_n(node, n_sparc_Ldf_ptr);
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_node *block = get_nodes_block(node);
+ ir_node *mem = get_irn_n(node, n_sparc_Ldf_mem);
+ ir_mode *load_store_mode = load_store_attr->load_store_mode;
+ ir_node *constant = create_constant_from_immediate(node, offset);
+ 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++) {
+ arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
+ }
+ exchange(node, new_load);
+ }
+
+}
+
+static void finish_sparc_St(ir_node *node)
+{
+ sparc_attr_t *attr = get_sparc_attr(node);
+ int offset = attr->immediate_value;
+ const sparc_load_store_attr_t *load_store_attr = get_sparc_load_store_attr_const(node);
+
+ if (! load_store_attr->is_frame_entity)
+ return;
+
+ if (! sparc_is_value_imm_encodeable(offset)) {
+ ir_node *ptr = get_irn_n(node, n_sparc_St_ptr);
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_node *block = get_nodes_block(node);
+ ir_node *mem = get_irn_n(node, n_sparc_St_mem);
+ ir_node *value = get_irn_n(node, n_sparc_St_val);
+ ir_mode *load_store_mode = load_store_attr->load_store_mode;
+ 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++) {
+ arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
+ }
+ exchange(node, new_load);
+ }
+
+}
+
+static void finish_sparc_Stf(ir_node *node)
+{
+ sparc_attr_t *attr = get_sparc_attr(node);
+ int offset = attr->immediate_value;
+ const sparc_load_store_attr_t *load_store_attr = get_sparc_load_store_attr_const(node);
+
+ if (! load_store_attr->is_frame_entity)
+ return;
+
+ if (! sparc_is_value_imm_encodeable(offset)) {
+ ir_node *ptr = get_irn_n(node, n_sparc_Stf_ptr);
+ dbg_info *dbgi = get_irn_dbg_info(node);
+ ir_node *block = get_nodes_block(node);
+ ir_node *mem = get_irn_n(node, n_sparc_Stf_mem);
+ ir_node *value = get_irn_n(node, n_sparc_Stf_val);
+ ir_mode *load_store_mode = load_store_attr->load_store_mode;
+ ir_node *constant = create_constant_from_immediate(node, offset);
+ 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++) {
+ arch_set_irn_register_out(new_load, i, arch_get_irn_register_out(node, i));
+ }
+ exchange(node, new_load);
+ }
+
+}
+
static void peephole_be_IncSP(ir_node *node)
{
ir_node *pred;
(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;
+ return (index >= REG_G0 && index <= REG_G7)
+ || (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 *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, 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 *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, 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. 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 */
+ ir_node *schedpoint = node;
+
+ while (sched_has_prev(schedpoint)) {
+ const arch_register_t *reg;
+ schedpoint = sched_prev(schedpoint);
+
+ if (--n_tries == 0)
+ break;
+
+ if (arch_get_irn_n_outs(schedpoint) == 0)
+ continue;
+
+ if (!mode_is_data(get_irn_mode(schedpoint)))
+ return;
+
+ reg = arch_get_irn_register(schedpoint);
+ if (!is_restorezeroopt_reg(reg))
+ continue;
+
+ if (be_is_Copy(schedpoint) && be_can_move_before(heights, schedpoint, node)) {
+ ir_node *op = get_irn_n(schedpoint, n_be_Copy_op);
+ 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_before(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_before(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_before(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;
}
}
-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);
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_Ldf, finish_sparc_Ldf);
register_peephole_optimisation(op_sparc_Return, finish_sparc_Return);
register_peephole_optimisation(op_sparc_Save, finish_sparc_Save);
+ register_peephole_optimisation(op_sparc_St, finish_sparc_St);
+ 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