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intel/nir: switch ray query state tracking to local variables uint16_t

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We should be able to use uint8_t but there appears to be a backend
bug.

Q2RTX shader compute shader improvement with ray queries :

Totals:
Instrs: 102221 -> 101499 (-0.71%); split: -0.82%, +0.12%
Cycles: 4451260 -> 4396025 (-1.24%)
Send messages: 3587 -> 3585 (-0.06%)
Spill count: 717 -> 658 (-8.23%)
Fill count: 1248 -> 1214 (-2.72%); split: -3.21%, +0.48%
Scratch Memory Size: 21504 -> 16384 (-23.81%)

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19982>
This commit is contained in:
Lionel Landwerlin
2022-11-17 23:32:21 +02:00
parent 085f6ec6eb
commit 25de091753
1 changed files with 56 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

108
src/intel/compiler/brw_nir_lower_ray_queries.c
View File

@@ -31,17 +31,18 @@
struct lowering_state {
const struct intel_device_info *devinfo;
nir_function_impl *impl;
struct hash_table *queries;
uint32_t n_queries;
struct brw_nir_rt_globals_defs globals;
nir_ssa_def *rq_globals;
uint32_t state_scratch_base_offset;
};
struct brw_ray_query {
nir_variable *opaque_var;
nir_variable *internal_var;
uint32_t id;
};
@@ -60,42 +61,48 @@ need_spill_fill(struct lowering_state *state)
* nir_intrinsic_rq_proceed.
*/
static bool
maybe_create_brw_var(nir_instr *instr, struct lowering_state *state)
static void
register_opaque_var(nir_variable *opaque_var, struct lowering_state *state)
{
if (instr->type != nir_instr_type_deref)
return false;
nir_deref_instr *deref = nir_instr_as_deref(instr);
if (deref->deref_type != nir_deref_type_var &&
deref->deref_type != nir_deref_type_array)
return false;
nir_variable *opaque_var = nir_deref_instr_get_variable(deref);
if (!opaque_var || !opaque_var->data.ray_query)
return false;
struct hash_entry *entry = _mesa_hash_table_search(state->queries, opaque_var);
if (entry)
return false;
assert(entry == NULL);
struct brw_ray_query *rq = rzalloc(state->queries, struct brw_ray_query);
rq->opaque_var = opaque_var;
rq->id = state->n_queries;
_mesa_hash_table_insert(state->queries, opaque_var, rq);
unsigned aoa_size = glsl_get_aoa_size(opaque_var->type);
state->n_queries += MAX2(1, aoa_size);
return true;
_mesa_hash_table_insert(state->queries, opaque_var, rq);
}
static void
create_internal_var(struct brw_ray_query *rq, struct lowering_state *state)
{
const struct glsl_type *opaque_type = rq->opaque_var->type;
const struct glsl_type *internal_type = glsl_uint16_t_type();
while (glsl_type_is_array(opaque_type)) {
assert(!glsl_type_is_unsized_array(opaque_type));
internal_type = glsl_array_type(internal_type,
glsl_array_size(opaque_type),
0);
opaque_type = glsl_get_array_element(opaque_type);
}
rq->internal_var = nir_local_variable_create(state->impl,
internal_type,
NULL);
}
static nir_ssa_def *
get_ray_query_shadow_addr(nir_builder *b,
nir_deref_instr *deref,
struct lowering_state *state,
nir_ssa_def **out_state_offset)
nir_deref_instr **out_state_deref)
{
nir_deref_path path;
nir_deref_path_init(&path, deref, NULL);
@@ -115,8 +122,7 @@ get_ray_query_shadow_addr(nir_builder *b,
brw_rt_ray_queries_shadow_stack_size(state->devinfo) * rq->id);
bool spill_fill = need_spill_fill(state);
*out_state_offset = nir_imm_int(b, state->state_scratch_base_offset +
SIZEOF_QUERY_STATE * rq->id);
*out_state_deref = nir_build_deref_var(b, rq->internal_var);
if (!spill_fill)
return NULL;
@@ -128,11 +134,7 @@ get_ray_query_shadow_addr(nir_builder *b,
nir_ssa_def *index = nir_ssa_for_src(b, (*p)->arr.index, 1);
/**/
uint32_t local_state_offset = SIZEOF_QUERY_STATE *
MAX2(1, glsl_get_aoa_size((*p)->type));
*out_state_offset =
nir_iadd(b, *out_state_offset,
nir_imul_imm(b, index, local_state_offset));
*out_state_deref = nir_build_deref_array(b, *out_state_deref, index);
/**/
uint64_t size = MAX2(1, glsl_get_aoa_size((*p)->type)) *
@@ -166,13 +168,13 @@ get_ray_query_shadow_addr(nir_builder *b,
static void
update_trace_ctrl_level(nir_builder *b,
nir_ssa_def *state_scratch_offset,
nir_deref_instr *state_deref,
nir_ssa_def **out_old_ctrl,
nir_ssa_def **out_old_level,
nir_ssa_def *new_ctrl,
nir_ssa_def *new_level)
{
nir_ssa_def *old_value = nir_load_scratch(b, 1, 32, state_scratch_offset, 4);
nir_ssa_def *old_value = nir_load_deref(b, state_deref);
nir_ssa_def *old_ctrl = nir_ishr_imm(b, old_value, 2);
nir_ssa_def *old_level = nir_iand_imm(b, old_value, 0x3);
@@ -181,6 +183,11 @@ update_trace_ctrl_level(nir_builder *b,
if (out_old_level)
*out_old_level = old_level;
if (new_ctrl)
new_ctrl = nir_i2i16(b, new_ctrl);
if (new_level)
new_level = nir_i2i16(b, new_level);
if (new_ctrl || new_level) {
if (!new_ctrl)
new_ctrl = old_ctrl;
@@ -188,7 +195,7 @@ update_trace_ctrl_level(nir_builder *b,
new_level = old_level;
nir_ssa_def *new_value = nir_ior(b, nir_ishl_imm(b, new_ctrl, 2), new_level);
nir_store_scratch(b, new_value, state_scratch_offset, 4, 0x1);
nir_store_deref(b, state_deref, new_value, 0x1);
}
}
@@ -221,9 +228,9 @@ lower_ray_query_intrinsic(nir_builder *b,
b->cursor = nir_instr_remove(&intrin->instr);
nir_ssa_def *ctrl_level_addr;
nir_deref_instr *ctrl_level_deref;
nir_ssa_def *shadow_stack_addr =
get_ray_query_shadow_addr(b, deref, state, &ctrl_level_addr);
get_ray_query_shadow_addr(b, deref, state, &ctrl_level_deref);
nir_ssa_def *hw_stack_addr =
brw_nir_rt_sync_stack_addr(b, state->globals.base_mem_addr, state->devinfo);
nir_ssa_def *stack_addr = shadow_stack_addr ? shadow_stack_addr : hw_stack_addr;
@@ -265,7 +272,7 @@ lower_ray_query_intrinsic(nir_builder *b,
brw_nir_rt_query_mark_init(b, stack_addr);
brw_nir_rt_store_mem_ray_query_at_addr(b, ray_addr, &ray_defs);
update_trace_ctrl_level(b, ctrl_level_addr,
update_trace_ctrl_level(b, ctrl_level_deref,
NULL, NULL,
nir_imm_int(b, GEN_RT_TRACE_RAY_INITAL),
nir_imm_int(b, BRW_RT_BVH_LEVEL_WORLD));
@@ -280,7 +287,7 @@ lower_ray_query_intrinsic(nir_builder *b,
nir_push_if(b, not_done);
{
nir_ssa_def *ctrl, *level;
update_trace_ctrl_level(b, ctrl_level_addr,
update_trace_ctrl_level(b, ctrl_level_deref,
&ctrl, &level,
NULL,
NULL);
@@ -304,7 +311,7 @@ lower_ray_query_intrinsic(nir_builder *b,
if (shadow_stack_addr)
spill_query(b, hw_stack_addr, shadow_stack_addr);
update_trace_ctrl_level(b, ctrl_level_addr,
update_trace_ctrl_level(b, ctrl_level_deref,
NULL, NULL,
nir_imm_int(b, GEN_RT_TRACE_RAY_CONTINUE),
hit_in.bvh_level);
@@ -326,7 +333,7 @@ lower_ray_query_intrinsic(nir_builder *b,
brw_nir_rt_mem_hit_addr_from_addr(b, stack_addr, true), 16,
brw_nir_rt_mem_hit_addr_from_addr(b, stack_addr, false), 16,
BRW_RT_SIZEOF_HIT_INFO);
update_trace_ctrl_level(b, ctrl_level_addr,
update_trace_ctrl_level(b, ctrl_level_deref,
NULL, NULL,
nir_imm_int(b, GEN_RT_TRACE_RAY_COMMIT),
nir_imm_int(b, BRW_RT_BVH_LEVEL_OBJECT));
@@ -335,7 +342,7 @@ lower_ray_query_intrinsic(nir_builder *b,
case nir_intrinsic_rq_generate_intersection: {
brw_nir_rt_generate_hit_addr(b, stack_addr, intrin->src[1].ssa);
update_trace_ctrl_level(b, ctrl_level_addr,
update_trace_ctrl_level(b, ctrl_level_deref,
NULL, NULL,
nir_imm_int(b, GEN_RT_TRACE_RAY_COMMIT),
nir_imm_int(b, BRW_RT_BVH_LEVEL_OBJECT));
@@ -529,34 +536,31 @@ bool
brw_nir_lower_ray_queries(nir_shader *shader,
const struct intel_device_info *devinfo)
{
assert(exec_list_length(&shader->functions) == 1);
struct lowering_state state = {
.devinfo = devinfo,
.impl = nir_shader_get_entrypoint(shader),
.queries = _mesa_pointer_hash_table_create(NULL),
};
assert(exec_list_length(&shader->functions) == 1);
/* Find query variables */
nir_function_impl *impl = nir_shader_get_entrypoint(shader);
nir_foreach_block_safe(block, impl) {
nir_foreach_instr(instr, block)
maybe_create_brw_var(instr, &state);
}
/* Map all query variable to internal type variables */
nir_foreach_function_temp_variable(var, state.impl)
register_opaque_var(var, &state);
hash_table_foreach(state.queries, entry)
create_internal_var(entry->data, &state);
bool progress = state.n_queries > 0;
if (progress) {
state.state_scratch_base_offset = shader->scratch_size;
shader->scratch_size += SIZEOF_QUERY_STATE * state.n_queries;
lower_ray_query_impl(impl, &state);
lower_ray_query_impl(state.impl, &state);
nir_remove_dead_derefs(shader);
nir_remove_dead_variables(shader,
nir_var_shader_temp | nir_var_function_temp,
NULL);
nir_metadata_preserve(impl, nir_metadata_none);
nir_metadata_preserve(state.impl, nir_metadata_none);
}
ralloc_free(state.queries);