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ir_sccp.c
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ir_sccp.c
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/*
* IR - Lightweight JIT Compilation Framework
* (SCCP - Sparse Conditional Constant Propagation)
* Copyright (C) 2022 Zend by Perforce.
* Authors: Dmitry Stogov <[email protected]>
*
* The SCCP algorithm is based on M. N. Wegman and F. K. Zadeck publication
* See: M. N. Wegman and F. K. Zadeck. "Constant propagation with conditional branches"
* ACM Transactions on Programming Languages and Systems, 13(2):181-210, April 1991
*/
#include "ir.h"
#include "ir_private.h"
#define IR_TOP IR_UNUSED
#define IR_BOTTOM IR_LAST_OP
#define IR_MAKE_TOP(ref) do {IR_ASSERT(ref > 0); _values[ref].optx = IR_TOP;} while (0)
#define IR_MAKE_BOTTOM(ref) do {IR_ASSERT(ref > 0); _values[ref].optx = IR_BOTTOM;} while (0)
#define IR_IS_TOP(ref) (ref >= 0 && _values[ref].optx == IR_TOP)
#define IR_IS_BOTTOM(ref) (ref >= 0 && _values[ref].optx == IR_BOTTOM)
#define IR_IS_FEASIBLE(ref) (ref >= 0 && _values[ref].optx != IR_TOP)
#define IR_COMBO_COPY_PROPAGATION 1
#if IR_COMBO_COPY_PROPAGATION
IR_ALWAYS_INLINE ir_ref ir_sccp_identity(ir_insn *_values, ir_ref a)
{
if (a > 0 && _values[a].op == IR_COPY) {
a = _values[a].op1;
IR_ASSERT(a < 0 || _values[a].op != IR_COPY); /* this may be a copy of symbolic constant */
}
return a;
}
#endif
static ir_ref ir_sccp_fold(ir_ctx *ctx, ir_insn *_values, ir_ref res, uint32_t opt, ir_ref op1, ir_ref op2, ir_ref op3)
{
ir_insn *op1_insn, *op2_insn, *op3_insn, *insn;
#if IR_COMBO_COPY_PROPAGATION
op1 = ir_sccp_identity(_values, op1);
op2 = ir_sccp_identity(_values, op2);
op3 = ir_sccp_identity(_values, op3);
#endif
restart:
op1_insn = (op1 > 0 && IR_IS_CONST_OP(_values[op1].op)) ? _values + op1 : ctx->ir_base + op1;
op2_insn = (op2 > 0 && IR_IS_CONST_OP(_values[op2].op)) ? _values + op2 : ctx->ir_base + op2;
op3_insn = (op3 > 0 && IR_IS_CONST_OP(_values[op3].op)) ? _values + op3 : ctx->ir_base + op3;
switch (ir_folding(ctx, opt, op1, op2, op3, op1_insn, op2_insn, op3_insn)) {
case IR_FOLD_DO_RESTART:
opt = ctx->fold_insn.optx;
op1 = ctx->fold_insn.op1;
op2 = ctx->fold_insn.op2;
op3 = ctx->fold_insn.op3;
goto restart;
case IR_FOLD_DO_EMIT:
IR_MAKE_BOTTOM(res);
return 1;
case IR_FOLD_DO_COPY:
op1 = ctx->fold_insn.op1;
#if IR_COMBO_COPY_PROPAGATION
op1 = ir_sccp_identity(_values, op1);
#endif
insn = (op1 > 0 && IR_IS_CONST_OP(_values[op1].op)) ? _values + op1 : ctx->ir_base + op1;
if (IR_IS_CONST_OP(insn->op)) {
/* pass */
#if IR_COMBO_COPY_PROPAGATION
} else if (_values[res].optx == IR_TOP) {
_values[res].optx = IR_OPT(IR_COPY, insn->type);
_values[res].op1 = op1;
return 1;
} else if (_values[res].op == IR_COPY && _values[res].op1 == op1) {
return 0; /* not changed */
} else {
IR_ASSERT(_values[res].optx != IR_BOTTOM);
/* we don't check for widening */
_values[res].optx = IR_OPT(IR_COPY, insn->type);
_values[res].op1 = op1;
return 1;
#else
} else {
IR_MAKE_BOTTOM(res);
return 1;
#endif
}
break;
case IR_FOLD_DO_CONST:
insn = &ctx->fold_insn;
break;
default:
IR_ASSERT(0);
return 0;
}
if (IR_IS_TOP(res)) {
_values[res].optx = IR_OPT(insn->type, insn->type);
_values[res].val.u64 = insn->val.u64;
return 1;
} else if (_values[res].opt != IR_OPT(insn->type, insn->type) || _values[res].val.u64 != insn->val.u64) {
IR_MAKE_BOTTOM(res);
return 1;
}
return 0; /* not changed */
}
static bool ir_sccp_meet_phi(ir_ctx *ctx, ir_insn *_values, ir_ref i, ir_insn *insn, ir_bitqueue *worklist)
{
ir_ref j, n, input, *merge_input, *p;
ir_insn *v, *new_const = NULL;
#if IR_COMBO_COPY_PROPAGATION
ir_ref new_copy;
#endif
if (!IR_IS_FEASIBLE(insn->op1)) {
return 0;
}
n = insn->inputs_count;
if (n > 3 && _values[i].optx == IR_TOP) {
for (j = 0; j < (n>>2); j++) {
_values[i+j+1].optx = IR_BOTTOM; /* keep the tail of a long multislot instruction */
}
}
p = insn->ops + 2;
merge_input = ctx->ir_base[insn->op1].ops + 1;
for (; --n > 0; p++, merge_input++) {
IR_ASSERT(*merge_input > 0);
if (_values[*merge_input].optx == IR_TOP) {
continue;
}
input = *p;
if (IR_IS_CONST_REF(input)) {
v = &ctx->ir_base[input];
} else if (input == i) {
continue;
} else {
v = &_values[input];
if (v->op == IR_TOP) {
/* do backward propagaton only once */
if (!v->op1) {
v->op1 = 1;
ir_bitqueue_add(worklist, input);
}
continue;
#if IR_COMBO_COPY_PROPAGATION
} else if (v->op == IR_COPY) {
input = v->op1;
IR_ASSERT(input < 0 || _values[input].op != IR_COPY);
new_copy = input;
goto next;
} else if (v->op == IR_BOTTOM) {
new_copy = input;
goto next;
#else
} else if (v->op == IR_BOTTOM) {
IR_MAKE_BOTTOM(i);
return 1;
#endif
}
}
new_copy = IR_UNUSED;
new_const = v;
goto next;
}
IR_ASSERT(_values[i].optx == IR_TOP);
return 0;
next:
p++;
merge_input++;
/* for all live merge inputs */
for (; --n > 0; p++, merge_input++) {
IR_ASSERT(*merge_input > 0);
if (_values[*merge_input].optx == IR_TOP) {
continue;
}
input = *p;
if (IR_IS_CONST_REF(input)) {
v = &ctx->ir_base[input];
} else if (input == i) {
continue;
} else {
v = &_values[input];
if (v->op == IR_TOP) {
/* do backward propagaton only once */
if (!v->op1) {
v->op1 = 1;
ir_bitqueue_add(worklist, input);
}
continue;
#if IR_COMBO_COPY_PROPAGATION
} else if (v->op == IR_COPY) {
input = v->op1;
IR_ASSERT(input < 0 || _values[input].op != IR_COPY);
if (new_copy == input) {
continue;
} else {
IR_MAKE_BOTTOM(i);
return 1;
}
} else if (v->op == IR_BOTTOM) {
if (new_copy == input) {
continue;
} else {
IR_MAKE_BOTTOM(i);
return 1;
}
#else
} else if (v->op == IR_BOTTOM) {
IR_MAKE_BOTTOM(i);
return 1;
#endif
}
}
if (!new_const || new_const->opt != v->opt || new_const->val.u64 != v->val.u64) {
IR_MAKE_BOTTOM(i);
return 1;
}
}
#if IR_COMBO_COPY_PROPAGATION
if (new_copy) {
if (_values[i].op == IR_COPY && _values[i].op1 == new_copy) {
return 0; /* not changed */
} else {
IR_ASSERT(_values[i].optx != IR_BOTTOM);
/* we don't check for widening */
_values[i].optx = IR_OPT(IR_COPY, ctx->ir_base[new_copy].type);
_values[i].op1 = new_copy;
return 1;
}
}
#endif
if (_values[i].optx == IR_TOP) {
_values[i].optx = new_const->opt;
_values[i].val.u64 = new_const->val.u64;
return 1;
} else if (_values[i].opt == new_const->opt && _values[i].val.u64 == new_const->val.u64) {
return 0;
} else {
IR_MAKE_BOTTOM(i);
return 1;
}
}
static bool ir_is_dead_load_ex(ir_ctx *ctx, ir_ref ref, uint32_t flags, ir_insn *insn)
{
if ((flags & (IR_OP_FLAG_MEM|IR_OP_FLAG_MEM_MASK)) == (IR_OP_FLAG_MEM|IR_OP_FLAG_MEM_LOAD)) {
return ctx->use_lists[ref].count == 1;
} else if (insn->op == IR_ALLOCA || insn->op == IR_BLOCK_BEGIN) {
return ctx->use_lists[ref].count == 1;
}
return 0;
}
static bool ir_is_dead_load(ir_ctx *ctx, ir_ref ref)
{
if (ctx->use_lists[ref].count == 1) {
uint32_t flags = ir_op_flags[ctx->ir_base[ref].op];
if ((flags & (IR_OP_FLAG_MEM|IR_OP_FLAG_MEM_MASK)) == (IR_OP_FLAG_MEM|IR_OP_FLAG_MEM_LOAD)) {
return 1;
} else if (ctx->ir_base[ref].op == IR_ALLOCA) {
return 1;
}
}
return 0;
}
static bool ir_is_dead(ir_ctx *ctx, ir_ref ref)
{
if (ctx->use_lists[ref].count == 0) {
return IR_IS_FOLDABLE_OP(ctx->ir_base[ref].op);
} else {
return ir_is_dead_load(ctx, ref);
}
return 0;
}
static ir_ref ir_find1(ir_ctx *ctx, uint32_t optx, ir_ref op1)
{
IR_ASSERT(!IR_IS_CONST_REF(op1));
ir_use_list *use_list = &ctx->use_lists[op1];
ir_ref *p, n = use_list->count;
for (p = ctx->use_edges + use_list->refs; n > 0; p++, n--) {
ir_ref use = *p;
ir_insn *use_insn = &ctx->ir_base[use];
if (use_insn->optx == optx) {
IR_ASSERT(use_insn->op1 == op1);
return use;
}
}
return IR_UNUSED;
}
static bool ir_sccp_is_true(ir_ctx *ctx, ir_insn *_values, ir_ref a)
{
ir_insn *v = IR_IS_CONST_REF(a) ? &ctx->ir_base[a] : &_values[a];
return ir_const_is_true(v);
}
static bool ir_sccp_is_equal(ir_ctx *ctx, ir_insn *_values, ir_ref a, ir_ref b)
{
ir_insn *v1 = IR_IS_CONST_REF(a) ? &ctx->ir_base[a] : &_values[a];
ir_insn *v2 = IR_IS_CONST_REF(b) ? &ctx->ir_base[b] : &_values[b];
IR_ASSERT(!IR_IS_SYM_CONST(v1->op));
IR_ASSERT(!IR_IS_SYM_CONST(v2->op));
return v1->val.u64 == v2->val.u64;
}
static void ir_sccp_make_nop(ir_ctx *ctx, ir_ref ref)
{
ir_ref j, n, *p;
ir_insn *insn;
CLEAR_USES(ref);
insn = &ctx->ir_base[ref];
n = insn->inputs_count;
insn->opt = IR_NOP; /* keep "inputs_count" */
for (j = 1, p = insn->ops + j; j <= n; j++, p++) {
*p = IR_UNUSED;
}
}
static void ir_sccp_remove_insn(ir_ctx *ctx, ir_insn *_values, ir_ref ref, ir_bitqueue *worklist)
{
ir_ref j, n, *p;
ir_insn *insn;
CLEAR_USES(ref);
insn = &ctx->ir_base[ref];
n = insn->inputs_count;
insn->opt = IR_NOP; /* keep "inputs_count" */
for (j = 1, p = insn->ops + j; j <= n; j++, p++) {
ir_ref input = *p;
*p = IR_UNUSED;
/* we may skip nodes that are going to be removed by SCCP (TOP, CONST and COPY) */
if (input > 0 && _values[input].op > IR_COPY) {
ir_use_list_remove_all(ctx, input, ref);
if (ir_is_dead(ctx, input)) {
/* schedule DCE */
ir_bitqueue_add(worklist, input);
}
}
}
}
static void ir_sccp_remove_insn2(ir_ctx *ctx, ir_ref ref, ir_bitqueue *worklist)
{
ir_ref j, n, *p;
ir_insn *insn;
CLEAR_USES(ref);
insn = &ctx->ir_base[ref];
n = insn->inputs_count;
insn->opt = IR_NOP; /* keep "inputs_count" */
for (j = 1, p = insn->ops + j; j <= n; j++, p++) {
ir_ref input = *p;
*p = IR_UNUSED;
if (input > 0) {
ir_use_list_remove_all(ctx, input, ref);
if (ir_is_dead(ctx, input)) {
/* schedule DCE */
ir_bitqueue_add(worklist, input);
} else if (ctx->ir_base[input].op == IR_PHI && ctx->use_lists[input].count == 1) {
/* try to optimize PHI into ABS/MIN/MAX/COND */
ir_bitqueue_add(worklist, ctx->ir_base[input].op1);
}
}
}
}
static void ir_sccp_replace_insn(ir_ctx *ctx, ir_insn *_values, ir_ref ref, ir_ref new_ref, ir_bitqueue *worklist)
{
ir_ref j, n, *p, use, k, l;
ir_insn *insn;
ir_use_list *use_list;
IR_ASSERT(ref != new_ref);
insn = &ctx->ir_base[ref];
n = insn->inputs_count;
insn->opt = IR_NOP; /* keep "inputs_count" */
for (j = 1, p = insn->ops + 1; j <= n; j++, p++) {
ir_ref input = *p;
*p = IR_UNUSED;
/* we may skip nodes that are going to be removed by SCCP (TOP, CONST and COPY) */
if (input > 0 && _values[input].op > IR_COPY) {
ir_use_list_remove_all(ctx, input, ref);
if (ir_is_dead(ctx, input)) {
/* schedule DCE */
ir_bitqueue_add(worklist, input);
}
}
}
use_list = &ctx->use_lists[ref];
n = use_list->count;
for (j = 0, p = &ctx->use_edges[use_list->refs]; j < n; j++, p++) {
use = *p;
if (IR_IS_FEASIBLE(use)) {
insn = &ctx->ir_base[use];
l = insn->inputs_count;
for (k = 1; k <= l; k++) {
if (ir_insn_op(insn, k) == ref) {
ir_insn_set_op(insn, k, new_ref);
}
}
#if IR_COMBO_COPY_PROPAGATION
if (new_ref > 0 && IR_IS_BOTTOM(use)) {
if (ir_use_list_add(ctx, new_ref, use)) {
/* restore after reallocation */
use_list = &ctx->use_lists[ref];
n = use_list->count;
p = &ctx->use_edges[use_list->refs + j];
}
}
#endif
/* we may skip nodes that are going to be removed by SCCP (TOP, CONST and COPY) */
if (worklist && _values[use].op > IR_COPY) {
/* schedule folding */
ir_bitqueue_add(worklist, use);
}
}
}
CLEAR_USES(ref);
}
static void ir_sccp_replace_insn2(ir_ctx *ctx, ir_ref ref, ir_ref new_ref, ir_bitqueue *worklist)
{
ir_ref j, n, *p, use, k, l;
ir_insn *insn;
ir_use_list *use_list;
IR_ASSERT(ref != new_ref);
insn = &ctx->ir_base[ref];
n = insn->inputs_count;
insn->opt = IR_NOP; /* keep "inputs_count" */
for (j = 1, p = insn->ops + 1; j <= n; j++, p++) {
ir_ref input = *p;
*p = IR_UNUSED;
if (input > 0) {
ir_use_list_remove_all(ctx, input, ref);
if (ir_is_dead(ctx, input)) {
/* schedule DCE */
ir_bitqueue_add(worklist, input);
} else if (ctx->ir_base[input].op == IR_PHI && ctx->use_lists[input].count == 1) {
/* try to optimize PHI into ABS/MIN/MAX/COND */
ir_bitqueue_add(worklist, input);
}
}
}
use_list = &ctx->use_lists[ref];
n = use_list->count;
for (j = 0, p = &ctx->use_edges[use_list->refs]; j < n; j++, p++) {
use = *p;
insn = &ctx->ir_base[use];
l = insn->inputs_count;
for (k = 1; k <= l; k++) {
if (ir_insn_op(insn, k) == ref) {
ir_insn_set_op(insn, k, new_ref);
}
}
#if IR_COMBO_COPY_PROPAGATION
if (new_ref > 0) {
if (ir_use_list_add(ctx, new_ref, use)) {
/* restore after reallocation */
use_list = &ctx->use_lists[ref];
n = use_list->count;
p = &ctx->use_edges[use_list->refs + j];
}
}
#endif
/* schedule folding */
ir_bitqueue_add(worklist, use);
}
CLEAR_USES(ref);
}
static void ir_sccp_fold2(ir_ctx *ctx, ir_ref ref, ir_bitqueue *worklist)
{
uint32_t opt;
ir_ref op1, op2, op3;
ir_insn *op1_insn, *op2_insn, *op3_insn, *insn;
insn = &ctx->ir_base[ref];
opt = insn->opt;
op1 = insn->op1;
op2 = insn->op2;
op3 = insn->op3;
restart:
op1_insn = ctx->ir_base + op1;
op2_insn = ctx->ir_base + op2;
op3_insn = ctx->ir_base + op3;
switch (ir_folding(ctx, opt, op1, op2, op3, op1_insn, op2_insn, op3_insn)) {
case IR_FOLD_DO_RESTART:
opt = ctx->fold_insn.optx;
op1 = ctx->fold_insn.op1;
op2 = ctx->fold_insn.op2;
op3 = ctx->fold_insn.op3;
goto restart;
case IR_FOLD_DO_EMIT:
insn = &ctx->ir_base[ref];
if (insn->opt != ctx->fold_insn.opt
|| insn->op1 != ctx->fold_insn.op1
|| insn->op2 != ctx->fold_insn.op2
|| insn->op3 != ctx->fold_insn.op3) {
ir_use_list *use_list;
ir_ref n, j, *p, use;
insn->optx = ctx->fold_insn.opt;
IR_ASSERT(!IR_OP_HAS_VAR_INPUTS(ir_op_flags[opt & IR_OPT_OP_MASK]));
insn->inputs_count = IR_INPUT_EDGES_COUNT(ir_op_flags[opt & IR_OPT_OP_MASK]);
if (insn->op1 != ctx->fold_insn.op1) {
if (insn->op1 > 0) {
ir_use_list_remove_one(ctx, insn->op1, ref);
}
if (ctx->fold_insn.op1 > 0) {
ir_use_list_add(ctx, ctx->fold_insn.op1, ref);
}
}
if (insn->op2 != ctx->fold_insn.op2) {
if (insn->op2 > 0) {
ir_use_list_remove_one(ctx, insn->op2, ref);
}
if (ctx->fold_insn.op2 > 0) {
ir_use_list_add(ctx, ctx->fold_insn.op2, ref);
}
}
if (insn->op3 != ctx->fold_insn.op3) {
if (insn->op3 > 0) {
ir_use_list_remove_one(ctx, insn->op3, ref);
}
if (ctx->fold_insn.op3 > 0) {
ir_use_list_add(ctx, ctx->fold_insn.op3, ref);
}
}
insn->op1 = ctx->fold_insn.op1;
insn->op2 = ctx->fold_insn.op2;
insn->op3 = ctx->fold_insn.op3;
use_list = &ctx->use_lists[ref];
n = use_list->count;
for (j = 0, p = &ctx->use_edges[use_list->refs]; j < n; j++, p++) {
use = *p;
ir_bitqueue_add(worklist, use);
}
}
break;
case IR_FOLD_DO_COPY:
op1 = ctx->fold_insn.op1;
ir_sccp_replace_insn2(ctx, ref, op1, worklist);
break;
case IR_FOLD_DO_CONST:
op1 = ir_const(ctx, ctx->fold_insn.val, ctx->fold_insn.type);
ir_sccp_replace_insn2(ctx, ref, op1, worklist);
break;
default:
IR_ASSERT(0);
break;
}
}
static void ir_sccp_remove_if(ir_ctx *ctx, ir_insn *_values, ir_ref ref, ir_ref dst)
{
ir_ref next;
ir_insn *insn, *next_insn;
insn = &ctx->ir_base[ref];
if (ctx->use_lists[dst].count == 1) {
next = ctx->use_edges[ctx->use_lists[dst].refs];
next_insn = &ctx->ir_base[next];
/* remove IF and IF_TRUE/FALSE from double linked control list */
next_insn->op1 = insn->op1;
ir_use_list_replace_one(ctx, insn->op1, ref, next);
/* remove IF and IF_TRUE/FALSE instructions */
ir_sccp_make_nop(ctx, ref);
ir_sccp_make_nop(ctx, dst);
} else {
insn->op2 = IR_UNUSED;
insn->optx = IR_OPTX(IR_END, IR_VOID, 1);
next_insn = &ctx->ir_base[dst];
next_insn->op = IR_BEGIN;
}
}
static void ir_sccp_remove_unfeasible_merge_inputs(ir_ctx *ctx, ir_insn *_values, ir_ref ref, ir_ref unfeasible_inputs)
{
ir_ref i, j, n, k, *p, use;
ir_insn *insn, *use_insn;
ir_use_list *use_list;
ir_bitset life_inputs;
insn = &ctx->ir_base[ref];
IR_ASSERT(insn->op == IR_MERGE || insn->op == IR_LOOP_BEGIN);
n = insn->inputs_count;
if (n - unfeasible_inputs == 1) {
/* remove MERGE completely */
for (j = 1; j <= n; j++) {
ir_ref input = ir_insn_op(insn, j);
if (input && IR_IS_FEASIBLE(input)) {
ir_insn *input_insn = &ctx->ir_base[input];
IR_ASSERT(input_insn->op == IR_END || input_insn->op == IR_LOOP_END||
input_insn->op == IR_IJMP || input_insn->op == IR_UNREACHABLE);
if (input_insn->op == IR_END || input_insn->op == IR_LOOP_END) {
if (input < ref) {
ir_ref prev, next = IR_UNUSED;
ir_insn *next_insn = NULL;
prev = input_insn->op1;
use_list = &ctx->use_lists[ref];
if (use_list->count == 1) {
next = ctx->use_edges[use_list->refs];
next_insn = &ctx->ir_base[next];
} else {
for (k = 0, p = &ctx->use_edges[use_list->refs]; k < use_list->count; k++, p++) {
use = *p;
use_insn = &ctx->ir_base[use];
IR_ASSERT((use_insn->op != IR_PHI) && "PHI must be already removed");
if (ir_op_flags[use_insn->op] & IR_OP_FLAG_CONTROL) {
IR_ASSERT(!next);
next = use;
next_insn = use_insn;
} else if (use_insn->op != IR_NOP) {
IR_ASSERT(use_insn->op1 == ref);
IR_ASSERT(use_insn->op == IR_VAR);
ir_ref region = prev;
while (!IR_IS_BB_START(ctx->ir_base[region].op)) {
region = ctx->ir_base[region].op1;
}
use_insn->op1 = region;
ir_use_list_add(ctx, region, use);
p = &ctx->use_edges[use_list->refs + k];
}
}
}
IR_ASSERT(prev && next);
/* remove MERGE and input END from double linked control list */
next_insn->op1 = prev;
ir_use_list_replace_one(ctx, prev, input, next);
/* remove MERGE and input END instructions */
ir_sccp_make_nop(ctx, ref);
ir_sccp_make_nop(ctx, input);
} else {
for (i = 2; i <= n; i++) {
ir_insn_set_op(insn, i, IR_UNUSED);
}
insn->op = IR_BEGIN;
insn->op1 = input;
input_insn->op = IR_END;
}
break;
} else {
for (i = 2; i <= n; i++) {
ir_insn_set_op(insn, i, IR_UNUSED);
}
insn->op = IR_BEGIN;
insn->op1 = input;
}
}
}
} else {
n = insn->inputs_count;
i = 1;
life_inputs = ir_bitset_malloc(n + 1);
for (j = 1; j <= n; j++) {
ir_ref input = ir_insn_op(insn, j);
if (input) {
if (i != j) {
ir_insn_set_op(insn, i, input);
}
ir_bitset_incl(life_inputs, j);
i++;
}
}
j = i;
while (j <= n) {
ir_insn_set_op(insn, j, IR_UNUSED);
j++;
}
i--;
insn->inputs_count = i;
n++;
use_list = &ctx->use_lists[ref];
if (use_list->count > 1) {
for (k = 0, p = &ctx->use_edges[use_list->refs]; k < use_list->count; k++, p++) {
use = *p;
use_insn = &ctx->ir_base[use];
if (use_insn->op == IR_PHI) {
i = 2;
for (j = 2; j <= n; j++) {
ir_ref input = ir_insn_op(use_insn, j);
if (ir_bitset_in(life_inputs, j - 1)) {
IR_ASSERT(input);
if (i != j) {
ir_insn_set_op(use_insn, i, input);
}
i++;
} else if (!IR_IS_CONST_REF(input)) {
ir_use_list_remove_one(ctx, input, use);
}
}
while (i <= n) {
ir_insn_set_op(use_insn, i, IR_UNUSED);
i++;
}
use_insn->inputs_count = insn->inputs_count + 1;
}
}
}
ir_mem_free(life_inputs);
}
}
static bool ir_may_promote_d2f(ir_ctx *ctx, ir_ref ref)
{
ir_insn *insn = &ctx->ir_base[ref];
IR_ASSERT(insn->type == IR_DOUBLE);
if (IR_IS_CONST_REF(ref)) {
return !IR_IS_SYM_CONST(insn->op) && insn->val.d == (double)(float)insn->val.d;
} else {
switch (insn->op) {
case IR_FP2FP:
return 1;
// case IR_INT2FP:
// return ctx->use_lists[ref].count == 1;
case IR_NEG:
case IR_ABS:
return ctx->use_lists[ref].count == 1 &&
ir_may_promote_d2f(ctx, insn->op1);
case IR_ADD:
case IR_SUB:
case IR_MUL:
case IR_DIV:
case IR_MIN:
case IR_MAX:
return ctx->use_lists[ref].count == 1 &&
ir_may_promote_d2f(ctx, insn->op1) &&
ir_may_promote_d2f(ctx, insn->op2);
default:
break;
}
}
return 0;
}
static bool ir_may_promote_f2d(ir_ctx *ctx, ir_ref ref)
{
ir_insn *insn = &ctx->ir_base[ref];
IR_ASSERT(insn->type == IR_FLOAT);
if (IR_IS_CONST_REF(ref)) {
return !IR_IS_SYM_CONST(insn->op) && insn->val.f == (float)(double)insn->val.f;
} else {
switch (insn->op) {
case IR_FP2FP:
return 1;
case IR_INT2FP:
return ctx->use_lists[ref].count == 1;
case IR_NEG:
case IR_ABS:
return ctx->use_lists[ref].count == 1 &&
ir_may_promote_f2d(ctx, insn->op1);
case IR_ADD:
case IR_SUB:
case IR_MUL:
// case IR_DIV:
case IR_MIN:
case IR_MAX:
return ctx->use_lists[ref].count == 1 &&
ir_may_promote_f2d(ctx, insn->op1) &&
ir_may_promote_f2d(ctx, insn->op2);
default:
break;
}
}
return 0;
}
static ir_ref ir_promote_d2f(ir_ctx *ctx, ir_ref ref, ir_ref use)
{
ir_insn *insn = &ctx->ir_base[ref];
uint32_t count;
IR_ASSERT(insn->type == IR_DOUBLE);
if (IR_IS_CONST_REF(ref)) {
return ir_const_float(ctx, (float)insn->val.d);
} else {
switch (insn->op) {
case IR_FP2FP:
count = ctx->use_lists[ref].count;
ir_use_list_remove_all(ctx, ref, use);
if (ctx->use_lists[ref].count == 0) {
ir_use_list_replace_one(ctx, insn->op1, ref, use);
if (count > 1) {
do {
ir_use_list_add(ctx, insn->op1, use);
} while (--count > 1);
}
ref = insn->op1;
MAKE_NOP(insn);
return ref;
} else {
ir_use_list_add(ctx, insn->op1, use);
count -= ctx->use_lists[ref].count;
if (count > 1) {
do {
ir_use_list_add(ctx, insn->op1, use);
} while (--count > 1);
}
}
return insn->op1;
// case IR_INT2FP:
// insn->type = IR_FLOAT;
// return ref;
case IR_NEG:
case IR_ABS:
insn->op1 = ir_promote_d2f(ctx, insn->op1, ref);
insn->type = IR_FLOAT;
return ref;
case IR_ADD:
case IR_SUB:
case IR_MUL:
case IR_DIV:
case IR_MIN:
case IR_MAX:
if (insn->op1 == insn->op2) {
insn->op2 = insn->op1 = ir_promote_d2f(ctx, insn->op1, ref);
} else {
insn->op1 = ir_promote_d2f(ctx, insn->op1, ref);
insn->op2 = ir_promote_d2f(ctx, insn->op2, ref);
}
insn->type = IR_FLOAT;
return ref;
default:
break;
}
}
IR_ASSERT(0);
return ref;
}
static ir_ref ir_promote_f2d(ir_ctx *ctx, ir_ref ref, ir_ref use)
{
ir_insn *insn = &ctx->ir_base[ref];
uint32_t count;
ir_ref old_ref;
IR_ASSERT(insn->type == IR_FLOAT);
if (IR_IS_CONST_REF(ref)) {
return ir_const_double(ctx, (double)insn->val.f);
} else {
switch (insn->op) {
case IR_FP2FP:
count = ctx->use_lists[ref].count;
ir_use_list_remove_all(ctx, ref, use);
if (ctx->use_lists[ref].count == 0) {
ir_use_list_replace_one(ctx, insn->op1, ref, use);
if (count > 1) {
do {
ir_use_list_add(ctx, insn->op1, use);
} while (--count > 1);
}
ref = insn->op1;
MAKE_NOP(insn);
return ref;
} else {
ir_use_list_add(ctx, insn->op1, use);
count -= ctx->use_lists[ref].count;
if (count > 1) {
do {
ir_use_list_add(ctx, insn->op1, use);
} while (--count > 1);
}
}
return insn->op1;
case IR_INT2FP:
old_ref = ir_find1(ctx, IR_OPTX(IR_INT2FP, IR_DOUBLE, 1), insn->op1);
if (old_ref) {
IR_ASSERT(ctx->use_lists[ref].count == 1);
ir_use_list_remove_one(ctx, insn->op1, ref);
CLEAR_USES(ref);
MAKE_NOP(insn);
ir_use_list_add(ctx, old_ref, use);
return old_ref;
}
insn->type = IR_DOUBLE;
return ref;
case IR_NEG:
case IR_ABS:
insn->op1 = ir_promote_f2d(ctx, insn->op1, ref);
insn->type = IR_DOUBLE;
return ref;
case IR_ADD:
case IR_SUB:
case IR_MUL:
// case IR_DIV:
case IR_MIN:
case IR_MAX:
if (insn->op1 == insn->op2) {
insn->op2 = insn->op1 = ir_promote_f2d(ctx, insn->op1, ref);
} else {
insn->op1 = ir_promote_f2d(ctx, insn->op1, ref);
insn->op2 = ir_promote_f2d(ctx, insn->op2, ref);
}
insn->type = IR_DOUBLE;
return ref;
default:
break;
}
}
IR_ASSERT(0);
return ref;
}
static bool ir_may_promote_i2i(ir_ctx *ctx, ir_type type, ir_ref ref)
{
ir_insn *insn = &ctx->ir_base[ref];
if (IR_IS_CONST_REF(ref)) {
return !IR_IS_SYM_CONST(insn->op);
} else {
switch (insn->op) {
case IR_ZEXT:
case IR_SEXT:
return ctx->ir_base[insn->op1].type == type;
case IR_NEG:
case IR_ABS:
case IR_NOT:
return ctx->use_lists[ref].count == 1 &&
ir_may_promote_i2i(ctx, type, insn->op1);
case IR_ADD:
case IR_SUB:
case IR_MUL:
// case IR_DIV:
case IR_MIN:
case IR_MAX:
case IR_OR:
case IR_AND:
case IR_XOR:
return ctx->use_lists[ref].count == 1 &&
ir_may_promote_i2i(ctx, type, insn->op1) &&
ir_may_promote_i2i(ctx, type, insn->op2);
default:
break;
}
}
return 0;
}
static ir_ref ir_promote_i2i(ir_ctx *ctx, ir_type type, ir_ref ref, ir_ref use)
{
ir_insn *insn = &ctx->ir_base[ref];
uint32_t count;
if (IR_IS_CONST_REF(ref)) {
return ir_const(ctx, insn->val, type);
} else {
switch (insn->op) {
case IR_ZEXT:
case IR_SEXT:
count = ctx->use_lists[ref].count;
ir_use_list_remove_all(ctx, ref, use);
if (ctx->use_lists[ref].count == 0) {
ir_use_list_replace_one(ctx, insn->op1, ref, use);
if (count > 1) {
do {
ir_use_list_add(ctx, insn->op1, use);
} while (--count > 1);
}
ref = insn->op1;
MAKE_NOP(insn);
return ref;
} else {
ir_use_list_add(ctx, insn->op1, use);