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ir_compute_live_ranges() micro-optimizations

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Dmitry Stogov 2022-11-16 00:11:52 +03:00
parent f72e6dc388
commit bd80dd4700
1 changed files with 34 additions and 28 deletions
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62
ir_ra.c
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@ -341,9 +341,9 @@ static void ir_add_phi_use(ir_ctx *ctx, int v, int op_num, ir_live_pos pos, ir_r
int ir_compute_live_ranges(ir_ctx *ctx)
{
uint32_t b, i, j, k, n, succ;
uint32_t b, i, j, k, n, succ, *p;
ir_ref ref;
uint32_t flags, len;
uint32_t len;
ir_insn *insn;
ir_block *bb, *succ_bb;
#ifdef IR_DEBUG
@ -379,8 +379,8 @@ int ir_compute_live_ranges(ir_ctx *ctx)
if (bb->successors_count == 0) {
ir_bitset_clear(live, len);
}
for (i = 0; i < bb->successors_count; i++) {
succ = ctx->cfg_edges[bb->successors + i];
for (i = 0, p = &ctx->cfg_edges[bb->successors + i]; i < bb->successors_count; i++, p++) {
succ = *p;
/* blocks must be ordered where all dominators of a block are before this block */
#ifdef IR_DEBUG
IR_ASSERT(ir_bitset_in(visited, succ) || bb->loop_header == succ);
@ -402,28 +402,31 @@ int ir_compute_live_ranges(ir_ctx *ctx)
if (succ_bb->predecessors_count > 1) {
ir_use_list *use_list = &ctx->use_lists[succ_bb->start];
k = 0;
for (j = 0; j < succ_bb->predecessors_count; j++) {
if (ctx->cfg_edges[succ_bb->predecessors + j] == b) {
k = j + 2;
break;
if (use_list->count > 1) {
k = 0;
for (j = 0; j < succ_bb->predecessors_count; j++) {
if (ctx->cfg_edges[succ_bb->predecessors + j] == b) {
k = j + 2;
break;
}
}
}
IR_ASSERT(k != 0);
for (ref = 0; ref < use_list->count; ref++) {
ir_ref use = ctx->use_edges[use_list->refs + ref];
insn = &ctx->ir_base[use];
if (insn->op == IR_PHI) {
if (ir_insn_op(insn, k) > 0) {
/* live.add(phi.inputOf(b)) */
IR_ASSERT(ctx->vregs[ir_insn_op(insn, k)]);
ir_bitset_incl(live, ctx->vregs[ir_insn_op(insn, k)]);
// TODO: ir_add_live_range() is used just to set ival->type
/* intervals[phi.inputOf(b)].addRange(b.from, b.to) */
ir_add_live_range(ctx, &unused, ctx->vregs[ir_insn_op(insn, k)], insn->type,
IR_START_LIVE_POS_FROM_REF(bb->start),
IR_END_LIVE_POS_FROM_REF(bb->end));
ir_add_phi_use(ctx, ctx->vregs[ir_insn_op(insn, k)], k, IR_DEF_LIVE_POS_FROM_REF(bb->end), use);
IR_ASSERT(k != 0);
for (ref = 0; ref < use_list->count; ref++) {
ir_ref use = ctx->use_edges[use_list->refs + ref];
insn = &ctx->ir_base[use];
if (insn->op == IR_PHI) {
ir_ref input = ir_insn_op(insn, k);
if (input > 0) {
/* live.add(phi.inputOf(b)) */
IR_ASSERT(ctx->vregs[input]);
ir_bitset_incl(live, ctx->vregs[input]);
// TODO: ir_add_live_range() is used just to set ival->type
/* intervals[phi.inputOf(b)].addRange(b.from, b.to) */
ir_add_live_range(ctx, &unused, ctx->vregs[input], insn->type,
IR_START_LIVE_POS_FROM_REF(bb->start),
IR_END_LIVE_POS_FROM_REF(bb->end));
ir_add_phi_use(ctx, ctx->vregs[input], k, IR_DEF_LIVE_POS_FROM_REF(bb->end), use);
}
}
}
}
@ -443,7 +446,6 @@ int ir_compute_live_ranges(ir_ctx *ctx)
uint8_t def_flags = 0;
insn = &ctx->ir_base[ref];
flags = ir_op_flags[insn->op];
if (ctx->rules) {
ir_tmp_reg tmp_regs[4];
int n = ir_get_temporary_regs(ctx, ref, tmp_regs);
@ -515,10 +517,14 @@ int ir_compute_live_ranges(ir_ctx *ctx)
}
}
if (insn->op != IR_PHI && (!ctx->rules || ctx->rules[ref] != IR_SKIP_MEM)) {
uint32_t flags = ir_op_flags[insn->op];
ir_ref *p;
n = ir_input_edges_count(ctx, insn);
for (j = 1; j <= n; j++) {
j = (flags & IR_OP_FLAG_CONTROL) ? 2 : 1;
for (p = insn->ops + j; j <= n; j++, p++) {
if (IR_OPND_KIND(flags, j) == IR_OPND_DATA) {
ir_ref input = ir_insn_op(insn, j);
ir_ref input = *p;
uint8_t use_flags;
if (ctx->rules) {