}
nir_ssa_def_rewrite_uses(def, nir_src_for_reg(reg));
- assert(list_empty(&def->uses) && list_empty(&def->if_uses));
+ assert(list_is_empty(&def->uses) && list_is_empty(&def->if_uses));
if (def->parent_instr->type == nir_instr_type_ssa_undef) {
/* If it's an ssa_undef instruction, remove it since we know we just got
else
assert(src.reg.reg->num_components >= dest_src.reg.reg->num_components);
- nir_alu_instr *mov = nir_alu_instr_create(b->shader, nir_op_imov);
+ nir_alu_instr *mov = nir_alu_instr_create(b->shader, nir_op_mov);
nir_src_copy(&mov->src[0].src, &src, mov);
mov->dest.dest = nir_dest_for_reg(dest_src.reg.reg);
mov->dest.write_mask = (1 << dest_src.reg.reg->num_components) - 1;
int a = pred[b];
emit_copy(&state->builder, values[loc[a]], values[b]);
- /* If any other copies want a they can find it at b */
- loc[a] = b;
-
/* b has been filled, mark it as not needing to be copied */
pred[b] = -1;
- /* If a needs to be filled, it's ready for copying now */
- if (pred[a] != -1)
+ /* If a needs to be filled... */
+ if (pred[a] != -1) {
+ /* If any other copies want a they can find it at b */
+ loc[a] = b;
+
+ /* It's ready for copying now */
ready[++ready_idx] = a;
+ }
}
int b = to_do[to_do_idx--];
if (pred[b] == -1)
nir_register *reg = nir_local_reg_create(state->builder.impl);
reg->name = "copy_temp";
reg->num_array_elems = 0;
- if (values[b].is_ssa)
+ if (values[b].is_ssa) {
reg->num_components = values[b].ssa->num_components;
- else
+ reg->bit_size = values[b].ssa->bit_size;
+ } else {
reg->num_components = values[b].reg.reg->num_components;
+ reg->bit_size = values[b].reg.reg->bit_size;
+ }
values[num_vals].is_ssa = false;
values[num_vals].reg.reg = reg;
nir_builder_init(&state.builder, impl);
state.dead_ctx = ralloc_context(NULL);
state.phi_webs_only = phi_webs_only;
- state.merge_node_table = _mesa_hash_table_create(NULL, _mesa_hash_pointer,
- _mesa_key_pointer_equal);
+ state.merge_node_table = _mesa_pointer_hash_table_create(NULL);
state.progress = false;
nir_foreach_block(block, impl) {
static void
place_phi_read(nir_shader *shader, nir_register *reg,
- nir_ssa_def *def, nir_block *block)
+ nir_ssa_def *def, nir_block *block, unsigned depth)
{
if (block != def->parent_instr->block) {
/* Try to go up the single-successor tree */
bool all_single_successors = true;
- struct set_entry *entry;
set_foreach(block->predecessors, entry) {
nir_block *pred = (nir_block *)entry->key;
if (pred->successors[0] && pred->successors[1]) {
}
}
- if (all_single_successors) {
+ if (all_single_successors && depth < 32) {
/* All predecessors of this block have exactly one successor and it
* is this block so they must eventually lead here without
* intersecting each other. Place the reads in the predecessors
* instead of this block.
+ *
+ * We only let this function recurse 32 times because it can recurse
+ * indefinitely in the presence of infinite loops. Because we're
+ * crawling a single-successor chain, it doesn't matter where we
+ * place it so it's ok to stop at an arbitrary distance.
+ *
+ * TODO: One day, we could detect back edges and avoid the recursion
+ * that way.
*/
- set_foreach(block->predecessors, entry)
- place_phi_read(shader, reg, def, (nir_block *)entry->key);
+ set_foreach(block->predecessors, entry) {
+ place_phi_read(shader, reg, def, (nir_block *)entry->key,
+ depth + 1);
+ }
return;
}
}
- nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_imov);
+ nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_mov);
mov->src[0].src = nir_src_for_ssa(def);
mov->dest.dest = nir_dest_for_reg(reg);
mov->dest.write_mask = (1 << reg->num_components) - 1;
nir_register *reg = create_reg_for_ssa_def(&phi->dest.ssa, impl);
- nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_imov);
+ nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_mov);
mov->src[0].src = nir_src_for_reg(reg);
mov->dest.write_mask = (1 << phi->dest.ssa.num_components) - 1;
nir_ssa_dest_init(&mov->instr, &mov->dest.dest,
nir_foreach_phi_src(src, phi) {
assert(src->src.is_ssa);
- place_phi_read(shader, reg, src->src.ssa, src->pred);
+ place_phi_read(shader, reg, src->src.ssa, src->pred, 0);
}
nir_instr_remove(&phi->instr);
return true;
}
+static bool
+ssa_def_is_local_to_block(nir_ssa_def *def, UNUSED void *state)
+{
+ nir_block *block = def->parent_instr->block;
+ nir_foreach_use(use_src, def) {
+ if (use_src->parent_instr->block != block ||
+ use_src->parent_instr->type == nir_instr_type_phi) {
+ return false;
+ }
+ }
+
+ if (!list_is_empty(&def->if_uses))
+ return false;
+
+ return true;
+}
+
/** Lower all of the SSA defs in a block to registers
*
* This performs the very simple operation of blindly replacing all of the SSA
nir_register *reg = create_reg_for_ssa_def(&load->def, state.impl);
nir_ssa_def_rewrite_uses(&load->def, nir_src_for_reg(reg));
- nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_imov);
+ nir_alu_instr *mov = nir_alu_instr_create(shader, nir_op_mov);
mov->src[0].src = nir_src_for_ssa(&load->def);
mov->dest.dest = nir_dest_for_reg(reg);
mov->dest.write_mask = (1 << reg->num_components) - 1;
nir_instr_insert(nir_after_instr(&load->instr), &mov->instr);
+ } else if (nir_foreach_ssa_def(instr, ssa_def_is_local_to_block, NULL)) {
+ /* If the SSA def produced by this instruction is only in the block
+ * in which it is defined and is not used by ifs or phis, then we
+ * don't have a reason to convert it to a register.
+ */
} else {
nir_foreach_dest(instr, dest_replace_ssa_with_reg, &state);
}
projects / mesa.git / blobdiff