/**
* This file implements the x87 support and virtual to stack
- * register translation.
+ * register translation for the ia32 backend.
+ *
+ * @author: Michael Beck
*
* $Id$
*/
#include "irop_t.h"
#include "irprog.h"
#include "iredges_t.h"
+#include "irgmod.h"
#include "obst.h"
#include "pmap.h"
#include "pdeq.h"
#include "irprintf.h"
-#include "..\belive.h"
+#include "..\belive_t.h"
#include "..\besched.h"
+#include "..\benode_t.h"
#include "ia32_new_nodes.h"
#include "gen_ia32_new_nodes.h"
#include "gen_ia32_regalloc_if.h"
/* the unop index */
#define UNOP_IDX 0
+/* the store val index */
+#define STORE_VAL_IDX 2
+
#define MASK_TOS(x) ((x) & (N_x87_REGS - 1))
/** the virtual floating point flag */
/**
* An exchange template.
* Note that our virtual functions have the same inputs
- * ant attributes as the real ones, so we can simple exchange
+ * and attributes as the real ones, so we can simple exchange
* their opcodes!
* Further, x87 supports inverse instructions, so we can handle them.
*/
typedef struct _exchange_tmpl {
- ir_op *normal_op; /**< the normal one */
- ir_op *reverse_op; /**< the reverse one if exists */
+ ir_op *normal_op; /**< the normal one */
+ ir_op *reverse_op; /**< the reverse one if exists */
+ ir_op *normal_pop_op; /**< the normal one with tos pop */
+ ir_op *reverse_pop_op; /**< the reverse one with tos pop */
} exchange_tmpl;
/**
}
/**
- * Set the tos virtual register
+ * Set a virtual register to st(pos)
*/
-static void x87_set_tos_reg(x87_state *state, const arch_register_t *vreg) {
+static void x87_set_reg(x87_state *state, const arch_register_t *vreg, int pos) {
assert(0 < state->depth);
- state->st[MASK_TOS(state->tos)] = vreg;
+ state->st[MASK_TOS(state->tos + pos)] = vreg;
+
+ printf("After SET_REG:\n "); x87_dump_stack(state);
+}
- printf("After INSTR:\n "); x87_dump_stack(state);
+/**
+ * Set the tos virtual register
+ */
+static void x87_set_tos_reg(x87_state *state, const arch_register_t *vreg) {
+ x87_set_reg(state, vreg, 0);
}
/**
printf("<<< %s %s, %s\n", get_irn_opname(fpush), attr->x87[0]->name, attr->x87[2]->name);
}
+/* --------------------------------- liveness ------------------------------------------ */
+
+/**
+ * The liveness transfer function.
+ * Updates a live set over a single step from a given node to its predecessor.
+ * Everything defined at the node is removed from the set, the uses of the node get inserted.
+ * @param arch_env The architecture environment.
+ * @param irn The node at which liveness should be computed.
+ * @param live The bitset of registers live before @p irn. This set gets modified by updating it to
+ * the registers live after irn.
+ * @return live.
+ */
+static unsigned vfp_liveness_transfer(const arch_env_t *arch_env, ir_node *irn, unsigned live)
+{
+ int i, n;
+ const arch_register_class_t *cls = &ia32_reg_classes[CLASS_ia32_vfp];
+
+ if(arch_irn_consider_in_reg_alloc(arch_env, cls, irn)) {
+ const arch_register_t *reg = arch_get_irn_register(arch_env, irn);
+ live &= ~(1 << reg->index);
+ }
+
+ for(i = 0, n = get_irn_arity(irn); i < n; ++i) {
+ ir_node *op = get_irn_n(irn, i);
+
+ if (arch_irn_consider_in_reg_alloc(arch_env, cls, op)) {
+ const arch_register_t *reg = arch_get_irn_register(arch_env, op);
+ live |= 1 << reg->index;
+ }
+ }
+
+ return live;
+}
+
+/**
+ * Put all live virtual registers at the end of a block into a bitset.
+ * @param arch_env The architecture environment.
+ * @param bl The block.
+ * @return The live bitset.
+ */
+static unsigned vfp_liveness_end_of_block(const arch_env_t *arch_env, const ir_node *bl)
+{
+ irn_live_t *li;
+ unsigned live = 0;
+ const arch_register_class_t *cls = &ia32_reg_classes[CLASS_ia32_vfp];
+
+ live_foreach(bl, li) {
+ ir_node *irn = (ir_node *) li->irn;
+ if (live_is_end(li) && arch_irn_consider_in_reg_alloc(arch_env, cls, irn)) {
+ const arch_register_t *reg = arch_get_irn_register(arch_env, irn);
+ live |= 1 << reg->index;
+ }
+ }
+
+ return live;
+}
+
+/**
+ * Compute a bitset of registers which are live at another node.
+ * @param arch_env The architecture environment.
+ * @param pos The node.
+ * @return The live bitset.
+ */
+static unsigned vfp_liveness_nodes_live_at(const arch_env_t *arch_env, const ir_node *pos)
+{
+ const ir_node *bl = is_Block(pos) ? pos : get_nodes_block(pos);
+ const arch_register_class_t *cls = &ia32_reg_classes[CLASS_ia32_vfp];
+ ir_node *irn;
+ unsigned live;
+
+ live = vfp_liveness_end_of_block(arch_env, bl);
+
+ sched_foreach_reverse(bl, irn) {
+ /*
+ * If we encounter the node we want to insert the Perm after,
+ * exit immediately, so that this node is still live
+ */
+ if (irn == pos)
+ return live;
+
+ live = vfp_liveness_transfer(arch_env, irn, live);
+ }
+
+ return live;
+}
+
+/**
+ * Returns true if a register is live in a set.
+ */
+static unsigned is_vfp_live(const arch_register_t *reg, unsigned live) {
+ return live & (1 << reg->index);
+}
+
+static vfp_dump_live(unsigned live) {
+ int i;
+
+ printf("Live registers here: \n");
+ for (i = 0; i < 8; ++i) {
+ if (live & (1 << i)) {
+ printf(" vf%d", i);
+ }
+ }
+ printf("\n");
+}
+
+/* --------------------------------- simulators ---------------------------------------- */
+
+#define XCHG(a, b) do { int t =(a); (a) = (b); (b) = t; } while (0)
+
/**
* Simulate a virtual binop
*/
static void sim_binop(x87_state *state, ir_node *n, const arch_env_t *env, const exchange_tmpl *tmpl) {
int op1_idx, op2_idx = -1;
- int out_idx;
+ int out_idx, do_pop =0;
+ ia32_attr_t *attr;
+ ir_op *dst;
const arch_register_t *op1 = arch_get_irn_register(env, get_irn_n(n, BINOP_IDX_1));
const arch_register_t *op2 = arch_get_irn_register(env, get_irn_n(n, BINOP_IDX_2));
const arch_register_t *out = arch_get_irn_register(env, n);
- ia32_attr_t *attr = get_ia32_attr(n);
+ unsigned live = vfp_liveness_nodes_live_at(env, n);
printf(">>> %s %s, %s -> %s\n", get_irn_opname(n), op1->name, op2->name, out->name);
+ vfp_dump_live(live);
- out_idx = x87_on_stack(state, out);
op1_idx = x87_on_stack(state, op1);
- if (out_idx == op1_idx) {
- /* good, first operands match, bring it to top */
- if (out_idx != 0) {
- x87_create_fxch(state, n, out_idx, BINOP_IDX_1);
- op1_idx = 0;
- out_idx = 0;
- }
+ if (op2->reg_class == &ia32_reg_classes[CLASS_ia32_vfp]) {
+ /* second operand is a vfp register */
+ op2_idx = x87_on_stack(state, op2);
- if (op2->index != REG_VFP_NOREG) {
- /* op2 is no address mode */
- op2_idx = x87_on_stack(state, op2);
- }
- else
- op2_idx = REG_ST_NOREG;
+ if (is_vfp_live(op1, live)) {
+ /* first operand is live */
- n->op = tmpl->normal_op;
- }
- else {
- if (op2->index != REG_VFP_NOREG) {
- /* op2 is no address mode */
- op2_idx = x87_on_stack(state, op2);
+ if (is_vfp_live(op2, live)) {
+ /* both operands are live: push the first one */
+ x87_create_fpush(env, state, n, op1_idx, BINOP_IDX_1);
+ out_idx = op1_idx = 0;
+ ++op2_idx;
+ dst = tmpl->normal_op;
+ do_pop = 0;
+ }
+ else {
+ /* first live, second operand is dead here, bring it to tos */
+ if (op2_idx != 0) {
+ x87_create_fxch(state, n, op2_idx, BINOP_IDX_2);
+ if (op1_idx == 0)
+ op1_idx = op2_idx;
+ }
+ op2_idx = out_idx = 0;
+ dst = tmpl->normal_op;
+ do_pop = 0;
+ }
}
-
- if (out_idx == op2_idx) {
- /* good, second operands match, bring it to top */
- if (out_idx != 0) {
- x87_create_fxch(state, n, out_idx, BINOP_IDX_2);
- op2_idx = 0;
- out_idx = 0;
-
- if (op1_idx == 0)
- op1_idx = out_idx;
+ else {
+ /* first operand is dead */
+ if (is_vfp_live(op2, live)) {
+ /* second operand is live: bring first to tos */
+ if (op1_idx != 0) {
+ x87_create_fxch(state, n, op1_idx, BINOP_IDX_1);
+ if (op2_idx == 0)
+ op2_idx = op1_idx;
+ }
+ op1_idx = out_idx = 0;
+ dst = tmpl->normal_op;
+ do_pop = 0;
+ }
+ else {
+ /* both operands are dead here, pop them from the stack */
+ if (op1_idx == 0) {
+ out_idx = op2_idx;
+ XCHG(op1_idx, op2_idx);
+ dst = tmpl->reverse_pop_op;
+ do_pop = 1;
+ }
+ else if (op2_idx == 0) {
+ out_idx = op1_idx;
+ dst = tmpl->normal_pop_op;
+ do_pop = 1;
+ }
+ else {
+ /* bring the second on top */
+ x87_create_fxch(state, n, op2_idx, BINOP_IDX_2);
+ op2_idx = 0;
+ out_idx = op1_idx;
+ dst = tmpl->normal_pop_op;
+ do_pop = 1;
+ }
}
- n->op = tmpl->reverse_op;
+ }
+ }
+ else {
+ /* second operand is an address mode */
+ if (is_vfp_live(op1, live)) {
+ /* first operand is live: push it here */
+ x87_create_fpush(env, state, n, op1_idx, BINOP_IDX_1);
}
else {
- /* bad, both numbers did not match, push op1 */
- x87_push(state, op1);
- if (op2->index != REG_VFP_NOREG)
- ++op2_idx;
- else
- op2_idx = REG_ST_NOREG;
- op1_idx = 0;
- out_idx = 0;
-
- n->op = tmpl->normal_op;
+ /* first operand is dead: bring it to tos */
+ if (op1_idx != 0)
+ x87_create_fxch(state, n, op1_idx, BINOP_IDX_1);
}
+ op1_idx = out_idx = 0;
+ dst = tmpl->normal_op;
+ do_pop = 0;
}
- x87_set_tos_reg(state, out);
+
+ x87_set_reg(state, out, out_idx);
+ if (do_pop)
+ x87_pop(state);
+
+ /* patch the operation */
+ n->op = dst;
+ attr = get_ia32_attr(n);
attr->x87[0] = op1 = &ia32_st_regs[op1_idx];
attr->x87[1] = op2 = &ia32_st_regs[op2_idx];
attr->x87[2] = out = &ia32_st_regs[out_idx];
int op1_idx, out_idx;
const arch_register_t *op1 = arch_get_irn_register(env, get_irn_n(n, UNOP_IDX));
const arch_register_t *out = arch_get_irn_register(env, n);
- ia32_attr_t *attr = get_ia32_attr(n);
+ ia32_attr_t *attr;
+ unsigned live = vfp_liveness_nodes_live_at(env, n);
+
+ printf(">>> %s -> %s\n", get_irn_opname(n), out->name);
+ vfp_dump_live(live);
- out_idx = x87_on_stack(state, out);
op1_idx = x87_on_stack(state, op1);
- if (out_idx == op1_idx) {
- /* good, operands match, bring it to top */
- if (out_idx != 0) {
- x87_create_fxch(state, n, out_idx, UNOP_IDX);
- op1_idx = 0;
- out_idx = 0;
- }
+ if (is_vfp_live(op1, live)) {
+ /* push the operand here */
+ x87_create_fpush(env, state, n, op1_idx, UNOP_IDX);
}
else {
- /* create a push or an exchange here */
- if (1)
- x87_create_fpush(env, state, n, op1_idx, UNOP_IDX);
- else
+ /* operand is dead, bring it to tos */
+ if (op1_idx != 0)
x87_create_fxch(state, n, op1_idx, UNOP_IDX);
}
- printf(">>> %s -> %s\n", get_irn_opname(n), out->name);
+
+ x87_set_tos_reg(state, out);
+ op1_idx = out_idx = 0;
n->op = op;
+ attr = get_ia32_attr(n);
attr->x87[0] = op1 = &ia32_st_regs[0];
attr->x87[2] = out = &ia32_st_regs[0];
printf("<<< %s -> %s\n", get_irn_opname(n), out->name);
}
/**
- * Simulate a virtual Load
+ * Simulate a virtual Load instructions
*/
static void sim_load(x87_state *state, ir_node *n, const arch_env_t *env, ir_op *op) {
const arch_register_t *out = arch_get_irn_register(env, n);
- ia32_attr_t *attr = get_ia32_attr(n);
+ ia32_attr_t *attr;
printf(">>> %s -> %s\n", get_irn_opname(n), out->name);
x87_push(state, out);
n->op = op;
+ attr = get_ia32_attr(n);
attr->x87[2] = out = &ia32_st_regs[0];
printf("<<< %s -> %s\n", get_irn_opname(n), out->name);
}
+/**
+ * Simulate a virtual Store
+ */
+static void sim_fst(x87_state *state, ir_node *n, const arch_env_t *env) {
+ int op2_idx;
+ const arch_register_t *op2 = arch_get_irn_register(env, get_irn_n(n, STORE_VAL_IDX));
+ ia32_attr_t *attr;
+ unsigned live = vfp_liveness_nodes_live_at(env, n);
+
+ op2_idx = x87_on_stack(state, op2);
+
+ printf(">>> %s %s ->\n", get_irn_opname(n), op2->name);
+
+ /* we can only store the tos to memory */
+ if (op2_idx != 0)
+ x87_create_fxch(state, n, op2_idx, STORE_VAL_IDX);
+
+ if (is_vfp_live(op2, live))
+ n->op = op_ia32_fst;
+ else {
+ x87_pop(state);
+ n->op = op_ia32_fstp;
+ }
+
+ attr = get_ia32_attr(n);
+ attr->x87[1] = op2 = &ia32_st_regs[0];
+ printf("<<< %s %s ->\n", get_irn_opname(n), op2->name);
+}
+
#define _GEN_BINOP(op, rev) \
static void sim_##op(x87_state *state, ir_node *n, const arch_env_t *env) { \
- exchange_tmpl tmpl = { op_ia32_##op, op_ia32_##rev }; \
+ exchange_tmpl tmpl = { op_ia32_##op, op_ia32_##rev, op_ia32_##op##p, op_ia32_##rev##p }; \
sim_binop(state, n, env, &tmpl); \
}
sim_unop(state, n, env, op_ia32_##op); \
}
-
+/* all stubs */
GEN_BINOP(fadd)
GEN_BINOPR(fsub)
GEN_BINOP(fmul)
GEN_UNOP(fcos)
GEN_UNOP(fsqrt)
+/**
+ * Simulate a virtual Copy
+ */
+static void sim_Copy(x87_state *state, ir_node *n, const arch_env_t *env) {
+ ir_mode *mode = get_irn_mode(n);
+
+ if (mode_is_float(mode)) {
+ const arch_register_t *op1 = arch_get_irn_register(env, get_irn_n(n, 0));
+ const arch_register_t *out = arch_get_irn_register(env, n);
+ ir_node *node, *next;
+ ia32_attr_t *attr;
+ int op1_idx;
+ unsigned live = vfp_liveness_nodes_live_at(env, n);
+
+ op1_idx = x87_on_stack(state, op1);
+
+ printf(">>> %s %s -> %s\n", get_irn_opname(n), op1->name, out->name);
+ vfp_dump_live(live);
+
+ if (is_vfp_live(op1, live)) {
+ /* operand is still live,a real copy */
+ x87_push(state, out);
+
+ node = new_rd_ia32_fpush(get_irn_dbg_info(n), get_irn_irg(n), get_nodes_block(n), get_irn_n(n, 0), mode);
+ arch_set_irn_register(env, node, out);
+
+ attr = get_ia32_attr(node);
+ attr->x87[0] = op1 = &ia32_st_regs[op1_idx];
+ attr->x87[2] = out = &ia32_st_regs[0];
+
+ next = sched_next(n);
+ sched_remove(n);
+ exchange(n, node);
+ sched_add_before(next, node);
+ printf(">>> %s %s -> %s\n", get_irn_opname(node), op1->name, out->name);
+ }
+ else {
+ /* just a virtual copy */
+ x87_set_reg(state, out, op1_idx);
+ sched_remove(n);
+ printf(">>> KILLED %s\n", get_irn_opname(n));
+ }
+ }
+}
+
/**
* Run a simulation and fix all virtual instructions for a block.
*
* zero if the simulation must be rerun
*/
static int x87_simulate_block(x87_simulator *sim, ir_node *block) {
- ir_node *n;
+ ir_node *n, *next;
blk_state *bl_state = x87_get_bl_state(sim, block);
x87_state *state = bl_state->begin;
const ir_edge_t *edge;
assert(bl_state->end == NULL);
- sched_foreach(block, n) {
+ /* beware, n might changed */
+ for (n = sched_first(block); !sched_is_end(n); n = next) {
ir_op *op = get_irn_op(n);
+ next = sched_next(n);
if (op->ops.generic) {
sim_func func = (sim_func)op->ops.generic;
clear_irp_opcodes_generic_func();
-#define ASSOC(op) (op_ia32_v ## op)->ops.generic = (op_func)(sim_##op)
+#define ASSOC(op) (op_ia32_v ## op)->ops.generic = (op_func)(sim_##op)
+#define ASSOC_BE(op) (op_be_ ## op)->ops.generic = (op_func)(sim_##op)
ASSOC(fConst);
ASSOC(fld);
ASSOC(fld1);
ASSOC(fsin);
ASSOC(fcos);
ASSOC(fsqrt);
+ ASSOC(fst);
+ ASSOC_BE(Copy);
+#undef ASSOC_BE
#undef ASSOC
}
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