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fuchsia / third_party / mesa / main / . / src / intel / compiler / elk / elk_nir.c
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/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "../intel_nir.h"
#include "elk_nir.h"
#include "elk_nir_private.h"
#include "elk_shader.h"
#include "dev/intel_debug.h"
#include "compiler/glsl_types.h"
#include "compiler/nir/nir_builder.h"
#include "util/u_math.h"
static bool
remap_tess_levels(nir_builder *b, nir_intrinsic_instr *intr,
enum tess_primitive_mode _primitive_mode)
{
const int location = nir_intrinsic_base(intr);
const unsigned component = nir_intrinsic_component(intr);
bool out_of_bounds = false;
bool write = !nir_intrinsic_infos[intr->intrinsic].has_dest;
unsigned mask = write ? nir_intrinsic_write_mask(intr) : 0;
nir_def *src = NULL, *dest = NULL;
if (write) {
assert(intr->num_components == intr->src[0].ssa->num_components);
} else {
assert(intr->num_components == intr->def.num_components);
}
if (location == VARYING_SLOT_TESS_LEVEL_INNER) {
b->cursor = write ? nir_before_instr(&intr->instr)
: nir_after_instr(&intr->instr);
switch (_primitive_mode) {
case TESS_PRIMITIVE_QUADS:
/* gl_TessLevelInner[0..1] lives at DWords 3-2 (reversed). */
nir_intrinsic_set_base(intr, 0);
if (write) {
assert(intr->src[0].ssa->num_components == 2);
intr->num_components = 4;
nir_def *undef = nir_undef(b, 1, 32);
nir_def *x = nir_channel(b, intr->src[0].ssa, 0);
nir_def *y = nir_channel(b, intr->src[0].ssa, 1);
src = nir_vec4(b, undef, undef, y, x);
mask = !!(mask & WRITEMASK_X) << 3 | !!(mask & WRITEMASK_Y) << 2;
} else if (intr->def.num_components > 1) {
assert(intr->def.num_components == 2);
intr->num_components = 4;
intr->def.num_components = 4;
unsigned wz[2] = { 3, 2 };
dest = nir_swizzle(b, &intr->def, wz, 2);
} else {
nir_intrinsic_set_component(intr, 3 - component);
}
break;
case TESS_PRIMITIVE_TRIANGLES:
/* gl_TessLevelInner[0] lives at DWord 4. */
nir_intrinsic_set_base(intr, 1);
mask &= WRITEMASK_X;
out_of_bounds = component > 0;
break;
case TESS_PRIMITIVE_ISOLINES:
out_of_bounds = true;
break;
default:
unreachable("Bogus tessellation domain");
}
} else if (location == VARYING_SLOT_TESS_LEVEL_OUTER) {
b->cursor = write ? nir_before_instr(&intr->instr)
: nir_after_instr(&intr->instr);
nir_intrinsic_set_base(intr, 1);
switch (_primitive_mode) {
case TESS_PRIMITIVE_QUADS:
case TESS_PRIMITIVE_TRIANGLES:
/* Quads: gl_TessLevelOuter[0..3] lives at DWords 7-4 (reversed).
* Triangles: gl_TessLevelOuter[0..2] lives at DWords 7-5 (reversed).
*/
if (write) {
assert(intr->src[0].ssa->num_components == 4);
unsigned wzyx[4] = { 3, 2, 1, 0 };
src = nir_swizzle(b, intr->src[0].ssa, wzyx, 4);
mask = !!(mask & WRITEMASK_X) << 3 | !!(mask & WRITEMASK_Y) << 2 |
!!(mask & WRITEMASK_Z) << 1 | !!(mask & WRITEMASK_W) << 0;
/* Don't overwrite the inner factor at DWord 4 for triangles */
if (_primitive_mode == TESS_PRIMITIVE_TRIANGLES)
mask &= ~WRITEMASK_X;
} else if (intr->def.num_components > 1) {
assert(intr->def.num_components == 4);
unsigned wzyx[4] = { 3, 2, 1, 0 };
dest = nir_swizzle(b, &intr->def, wzyx, 4);
} else {
nir_intrinsic_set_component(intr, 3 - component);
out_of_bounds = component == 3 &&
_primitive_mode == TESS_PRIMITIVE_TRIANGLES;
}
break;
case TESS_PRIMITIVE_ISOLINES:
/* gl_TessLevelOuter[0..1] lives at DWords 6-7 (in order). */
if (write) {
assert(intr->src[0].ssa->num_components == 4);
nir_def *undef = nir_undef(b, 1, 32);
nir_def *x = nir_channel(b, intr->src[0].ssa, 0);
nir_def *y = nir_channel(b, intr->src[0].ssa, 1);
src = nir_vec4(b, undef, undef, x, y);
mask = !!(mask & WRITEMASK_X) << 2 | !!(mask & WRITEMASK_Y) << 3;
} else {
nir_intrinsic_set_component(intr, 2 + component);
out_of_bounds = component > 1;
}
break;
default:
unreachable("Bogus tessellation domain");
}
} else {
return false;
}
if (out_of_bounds) {
if (!write)
nir_def_rewrite_uses(&intr->def, nir_undef(b, 1, 32));
nir_instr_remove(&intr->instr);
} else if (write) {
nir_intrinsic_set_write_mask(intr, mask);
if (src) {
nir_src_rewrite(&intr->src[0], src);
}
} else if (dest) {
nir_def_rewrite_uses_after(&intr->def, dest,
dest->parent_instr);
}
return true;
}
static bool
is_input(nir_intrinsic_instr *intrin)
{
return intrin->intrinsic == nir_intrinsic_load_input ||
intrin->intrinsic == nir_intrinsic_load_per_primitive_input ||
intrin->intrinsic == nir_intrinsic_load_per_vertex_input ||
intrin->intrinsic == nir_intrinsic_load_interpolated_input;
}
static bool
is_output(nir_intrinsic_instr *intrin)
{
return intrin->intrinsic == nir_intrinsic_load_output ||
intrin->intrinsic == nir_intrinsic_load_per_vertex_output ||
intrin->intrinsic == nir_intrinsic_store_output ||
intrin->intrinsic == nir_intrinsic_store_per_vertex_output;
}
static bool
remap_patch_urb_offsets(nir_block *block, nir_builder *b,
const struct intel_vue_map *vue_map,
enum tess_primitive_mode tes_primitive_mode)
{
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
gl_shader_stage stage = b->shader->info.stage;
if ((stage == MESA_SHADER_TESS_CTRL && is_output(intrin)) ||
(stage == MESA_SHADER_TESS_EVAL && is_input(intrin))) {
if (remap_tess_levels(b, intrin, tes_primitive_mode))
continue;
int vue_slot = vue_map->varying_to_slot[intrin->const_index[0]];
assert(vue_slot != -1);
intrin->const_index[0] = vue_slot;
nir_src *vertex = nir_get_io_arrayed_index_src(intrin);
if (vertex) {
if (nir_src_is_const(*vertex)) {
intrin->const_index[0] += nir_src_as_uint(*vertex) *
vue_map->num_per_vertex_slots;
} else {
b->cursor = nir_before_instr(&intrin->instr);
/* Multiply by the number of per-vertex slots. */
nir_def *vertex_offset =
nir_imul(b,
vertex->ssa,
nir_imm_int(b,
vue_map->num_per_vertex_slots));
/* Add it to the existing offset */
nir_src *offset = nir_get_io_offset_src(intrin);
nir_def *total_offset =
nir_iadd(b, vertex_offset,
offset->ssa);
nir_src_rewrite(offset, total_offset);
}
}
}
}
return true;
}
void
elk_nir_lower_vs_inputs(nir_shader *nir,
bool edgeflag_is_last,
const uint8_t *vs_attrib_wa_flags)
{
/* Start with the location of the variable's base. */
nir_foreach_shader_in_variable(var, nir)
var->data.driver_location = var->data.location;
/* Now use nir_lower_io to walk dereference chains. Attribute arrays are
* loaded as one vec4 or dvec4 per element (or matrix column), depending on
* whether it is a double-precision type or not.
*/
nir_lower_io(nir, nir_var_shader_in, elk_type_size_vec4,
nir_lower_io_lower_64bit_to_32);
/* This pass needs actual constants */
nir_opt_constant_folding(nir);
nir_io_add_const_offset_to_base(nir, nir_var_shader_in);
elk_nir_apply_attribute_workarounds(nir, vs_attrib_wa_flags);
/* The last step is to remap VERT_ATTRIB_* to actual registers */
/* Whether or not we have any system generated values. gl_DrawID is not
* included here as it lives in its own vec4.
*/
const bool has_sgvs =
BITSET_TEST(nir->info.system_values_read, SYSTEM_VALUE_FIRST_VERTEX) ||
BITSET_TEST(nir->info.system_values_read, SYSTEM_VALUE_BASE_INSTANCE) ||
BITSET_TEST(nir->info.system_values_read, SYSTEM_VALUE_VERTEX_ID_ZERO_BASE) ||
BITSET_TEST(nir->info.system_values_read, SYSTEM_VALUE_INSTANCE_ID);
const unsigned num_inputs = util_bitcount64(nir->info.inputs_read);
nir_foreach_function_impl(impl, nir) {
nir_builder b = nir_builder_create(impl);
nir_foreach_block(block, impl) {
nir_foreach_instr_safe(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
switch (intrin->intrinsic) {
case nir_intrinsic_load_first_vertex:
case nir_intrinsic_load_base_instance:
case nir_intrinsic_load_vertex_id_zero_base:
case nir_intrinsic_load_instance_id:
case nir_intrinsic_load_is_indexed_draw:
case nir_intrinsic_load_draw_id: {
b.cursor = nir_after_instr(&intrin->instr);
/* gl_VertexID and friends are stored by the VF as the last
* vertex element. We convert them to load_input intrinsics at
* the right location.
*/
nir_intrinsic_instr *load =
nir_intrinsic_instr_create(nir, nir_intrinsic_load_input);
load->src[0] = nir_src_for_ssa(nir_imm_int(&b, 0));
nir_intrinsic_set_base(load, num_inputs);
switch (intrin->intrinsic) {
case nir_intrinsic_load_first_vertex:
nir_intrinsic_set_component(load, 0);
break;
case nir_intrinsic_load_base_instance:
nir_intrinsic_set_component(load, 1);
break;
case nir_intrinsic_load_vertex_id_zero_base:
nir_intrinsic_set_component(load, 2);
break;
case nir_intrinsic_load_instance_id:
nir_intrinsic_set_component(load, 3);
break;
case nir_intrinsic_load_draw_id:
case nir_intrinsic_load_is_indexed_draw:
/* gl_DrawID and IsIndexedDraw are stored right after
* gl_VertexID and friends if any of them exist.
*/
nir_intrinsic_set_base(load, num_inputs + has_sgvs);
if (intrin->intrinsic == nir_intrinsic_load_draw_id)
nir_intrinsic_set_component(load, 0);
else
nir_intrinsic_set_component(load, 1);
break;
default:
unreachable("Invalid system value intrinsic");
}
load->num_components = 1;
nir_def_init(&load->instr, &load->def, 1, 32);
nir_builder_instr_insert(&b, &load->instr);
nir_def_replace(&intrin->def, &load->def);
break;
}
case nir_intrinsic_load_input: {
/* Attributes come in a contiguous block, ordered by their
* gl_vert_attrib value. That means we can compute the slot
* number for an attribute by masking out the enabled attributes
* before it and counting the bits.
*/
int attr = nir_intrinsic_base(intrin);
uint64_t inputs_read = nir->info.inputs_read;
int slot = -1;
if (edgeflag_is_last) {
inputs_read &= ~BITFIELD64_BIT(VERT_ATTRIB_EDGEFLAG);
if (attr == VERT_ATTRIB_EDGEFLAG)
slot = num_inputs - 1;
}
if (slot == -1)
slot = util_bitcount64(inputs_read &
BITFIELD64_MASK(attr));
nir_intrinsic_set_base(intrin, slot);
break;
}
default:
break; /* Nothing to do */
}
}
}
}
}
void
elk_nir_lower_vue_inputs(nir_shader *nir,
const struct intel_vue_map *vue_map)
{
nir_foreach_shader_in_variable(var, nir)
var->data.driver_location = var->data.location;
/* Inputs are stored in vec4 slots, so use elk_type_size_vec4(). */
nir_lower_io(nir, nir_var_shader_in, elk_type_size_vec4,
nir_lower_io_lower_64bit_to_32);
/* This pass needs actual constants */
nir_opt_constant_folding(nir);
nir_io_add_const_offset_to_base(nir, nir_var_shader_in);
nir_foreach_function_impl(impl, nir) {
nir_foreach_block(block, impl) {
nir_foreach_instr(instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
if (intrin->intrinsic == nir_intrinsic_load_input ||
intrin->intrinsic == nir_intrinsic_load_per_vertex_input) {
/* Offset 0 is the VUE header, which contains
* VARYING_SLOT_LAYER [.y], VARYING_SLOT_VIEWPORT [.z], and
* VARYING_SLOT_PSIZ [.w].
*/
int varying = nir_intrinsic_base(intrin);
int vue_slot;
switch (varying) {
case VARYING_SLOT_PSIZ:
nir_intrinsic_set_base(intrin, 0);
nir_intrinsic_set_component(intrin, 3);
break;
default:
vue_slot = vue_map->varying_to_slot[varying];
assert(vue_slot != -1);
nir_intrinsic_set_base(intrin, vue_slot);
break;
}
}
}
}
}
}
void
elk_nir_lower_tes_inputs(nir_shader *nir, const struct intel_vue_map *vue_map)
{
nir_foreach_shader_in_variable(var, nir)
var->data.driver_location = var->data.location;
nir_lower_io(nir, nir_var_shader_in, elk_type_size_vec4,
nir_lower_io_lower_64bit_to_32);
/* This pass needs actual constants */
nir_opt_constant_folding(nir);
nir_io_add_const_offset_to_base(nir, nir_var_shader_in);
nir_foreach_function_impl(impl, nir) {
nir_builder b = nir_builder_create(impl);
nir_foreach_block(block, impl) {
remap_patch_urb_offsets(block, &b, vue_map,
nir->info.tess._primitive_mode);
}
}
}
static bool
lower_barycentric_per_sample(nir_builder *b,
nir_intrinsic_instr *intrin,
UNUSED void *cb_data)
{
if (intrin->intrinsic != nir_intrinsic_load_barycentric_pixel &&
intrin->intrinsic != nir_intrinsic_load_barycentric_centroid)
return false;
b->cursor = nir_before_instr(&intrin->instr);
nir_def *centroid =
nir_load_barycentric(b, nir_intrinsic_load_barycentric_sample,
nir_intrinsic_interp_mode(intrin));
nir_def_replace(&intrin->def, centroid);
return true;
}
/**
* Convert interpolateAtOffset() offsets from [-0.5, +0.5] floating point
* offsets to integer [-8, +7] offsets (in units of 1/16th of a pixel).
*
* We clamp to +7/16 on the upper end of the range, since +0.5 isn't
* representable in a S0.4 value; a naive conversion would give us -8/16,
* which is the opposite of what was intended.
*
* This is allowed by GL_ARB_gpu_shader5's quantization rules:
*
* "Not all values of <offset> may be supported; x and y offsets may
* be rounded to fixed-point values with the number of fraction bits
* given by the implementation-dependent constant
* FRAGMENT_INTERPOLATION_OFFSET_BITS."
*/
static bool
lower_barycentric_at_offset(nir_builder *b, nir_intrinsic_instr *intrin,
void *data)
{
if (intrin->intrinsic != nir_intrinsic_load_barycentric_at_offset)
return false;
b->cursor = nir_before_instr(&intrin->instr);
assert(intrin->src[0].ssa);
nir_def *offset =
nir_imin(b, nir_imm_int(b, 7),
nir_f2i32(b, nir_fmul_imm(b, intrin->src[0].ssa, 16)));
nir_src_rewrite(&intrin->src[0], offset);
return true;
}
static bool
elk_nir_lower_fs_smooth_interp_gfx4_instr(nir_builder *b, nir_intrinsic_instr *intr, void *_data)
{
if (intr->intrinsic != nir_intrinsic_load_deref)
return false;
nir_deref_instr *deref = nir_instr_as_deref(intr->src[0].ssa->parent_instr);
nir_variable *var = nir_deref_instr_get_variable(deref);
if (var->data.interpolation != INTERP_MODE_SMOOTH)
return false;
/* If we haven't computed pixel_w yet, do so now (once, at the start of the
* shader). CSE could do this, but this makes things more legible and saves
* followup optimization.
*/
nir_def **pixel_w = _data;
if (!*pixel_w) {
b->cursor = nir_before_block(nir_start_block(b->impl));
nir_def *w = nir_load_frag_coord_w(b);
BITSET_SET(b->shader->info.system_values_read, SYSTEM_VALUE_FRAG_COORD_W);
*pixel_w = nir_frcp(b, w);
}
b->cursor = nir_after_instr(&intr->instr);
nir_def *result = nir_fmul(b, &intr->def, *pixel_w);
nir_def_rewrite_uses_after(&intr->def, result, result->parent_instr);
return true;
}
/* Multiplies all smooth interpolation outputs by 1/frag_w. */
static bool
elk_nir_lower_fs_smooth_interp_gfx4(nir_shader *shader)
{
nir_def *pixel_w = NULL;
return nir_shader_intrinsics_pass(shader, elk_nir_lower_fs_smooth_interp_gfx4_instr,
nir_metadata_block_index | nir_metadata_dominance,
&pixel_w);
}
static bool
elk_nir_lower_load_frag_coord_w_gfx4_instr(nir_builder *b, nir_intrinsic_instr *intr, void *_data)
{
if (intr->intrinsic != nir_intrinsic_load_frag_coord_w)
return false;
nir_variable *pos = nir_get_variable_with_location(b->shader, nir_var_shader_in,
VARYING_SLOT_POS, glsl_vec4_type());
/* See elk_nir_lower_fs_inputs(), which did this for other vars already. */
pos->data.driver_location = VARYING_SLOT_POS;
b->cursor = nir_instr_remove(&intr->instr);
nir_def_rewrite_uses(&intr->def, nir_channel(b, nir_load_var(b, pos), 3));
return true;
}
/* No actual sysval for gl_FragCoord.w on this hardware, promote it to a varying
* interpolation.
*/
static bool
elk_nir_lower_load_frag_coord_w_gfx4(nir_shader *shader)
{
return nir_shader_intrinsics_pass(shader, elk_nir_lower_load_frag_coord_w_gfx4_instr,
nir_metadata_block_index | nir_metadata_dominance,
NULL);
}
void
elk_nir_lower_fs_inputs(nir_shader *nir,
const struct intel_device_info *devinfo,
const struct elk_wm_prog_key *key)
{
nir_foreach_shader_in_variable(var, nir) {
var->data.driver_location = var->data.location;
/* Apply default interpolation mode.
*
* Everything defaults to smooth except for the legacy GL color
* built-in variables, which might be flat depending on API state.
*/
if (var->data.interpolation == INTERP_MODE_NONE) {
const bool flat = key->flat_shade &&
(var->data.location == VARYING_SLOT_COL0 ||
var->data.location == VARYING_SLOT_COL1);
var->data.interpolation = flat ? INTERP_MODE_FLAT
: INTERP_MODE_SMOOTH;
}
/* On Ironlake and below, there is only one interpolation mode.
* Centroid interpolation doesn't mean anything on this hardware --
* there is no multisampling.
*/
if (devinfo->ver < 6) {
var->data.centroid = false;
var->data.sample = false;
}
}
/* This needs to run late, after lower_wpos_center and lower_input_attachments. */
NIR_PASS(_, nir, nir_lower_frag_coord_to_pixel_coord);
if (devinfo->ver < 6) {
/* Needs to be run before nir_lower_io. */
NIR_PASS(_, nir, elk_nir_lower_fs_smooth_interp_gfx4);
NIR_PASS(_, nir, elk_nir_lower_load_frag_coord_w_gfx4);
}
nir_lower_io(nir, nir_var_shader_in, elk_type_size_vec4,
nir_lower_io_lower_64bit_to_32 |
nir_lower_io_use_interpolated_input_intrinsics);
if (key->multisample_fbo == ELK_NEVER) {
nir_lower_single_sampled(nir);
} else if (key->persample_interp == ELK_ALWAYS) {
nir_shader_intrinsics_pass(nir, lower_barycentric_per_sample,
nir_metadata_control_flow,
NULL);
}
nir_shader_intrinsics_pass(nir, lower_barycentric_at_offset,
nir_metadata_control_flow,
NULL);
/* This pass needs actual constants */
nir_opt_constant_folding(nir);
nir_io_add_const_offset_to_base(nir, nir_var_shader_in);
}
void
elk_nir_lower_vue_outputs(nir_shader *nir)
{
nir_foreach_shader_out_variable(var, nir) {
var->data.driver_location = var->data.location;
}
nir_lower_io(nir, nir_var_shader_out, elk_type_size_vec4,
nir_lower_io_lower_64bit_to_32);
}
void
elk_nir_lower_tcs_outputs(nir_shader *nir, const struct intel_vue_map *vue_map,
enum tess_primitive_mode tes_primitive_mode)
{
nir_foreach_shader_out_variable(var, nir) {
var->data.driver_location = var->data.location;
}
nir_lower_io(nir, nir_var_shader_out, elk_type_size_vec4,
nir_lower_io_lower_64bit_to_32);
/* This pass needs actual constants */
nir_opt_constant_folding(nir);
nir_io_add_const_offset_to_base(nir, nir_var_shader_out);
nir_foreach_function_impl(impl, nir) {
nir_builder b = nir_builder_create(impl);
nir_foreach_block(block, impl) {
remap_patch_urb_offsets(block, &b, vue_map, tes_primitive_mode);
}
}
}
void
elk_nir_lower_fs_outputs(nir_shader *nir)
{
nir_foreach_shader_out_variable(var, nir) {
var->data.driver_location =
SET_FIELD(var->data.index, ELK_NIR_FRAG_OUTPUT_INDEX) |
SET_FIELD(var->data.location, ELK_NIR_FRAG_OUTPUT_LOCATION);
}
nir_lower_io(nir, nir_var_shader_out, elk_type_size_dvec4, 0);
}
#define OPT(pass, ...) ({ \
bool this_progress = false; \
NIR_PASS(this_progress, nir, pass, ##__VA_ARGS__); \
if (this_progress) \
progress = true; \
this_progress; \
})
void
elk_nir_optimize(nir_shader *nir, bool is_scalar,
const struct intel_device_info *devinfo)
{
bool progress;
unsigned lower_flrp =
(nir->options->lower_flrp16 ? 16 : 0) |
(nir->options->lower_flrp32 ? 32 : 0) |
(nir->options->lower_flrp64 ? 64 : 0);
do {
progress = false;
OPT(nir_shrink_vec_array_vars, nir_var_function_temp);
OPT(nir_opt_deref);
if (OPT(nir_opt_memcpy))
OPT(nir_split_var_copies);
OPT(nir_lower_vars_to_ssa);
if (!nir->info.var_copies_lowered) {
/* Only run this pass if nir_lower_var_copies was not called
* yet. That would lower away any copy_deref instructions and we
* don't want to introduce any more.
*/
OPT(nir_opt_find_array_copies);
}
OPT(nir_opt_copy_prop_vars);
OPT(nir_opt_dead_write_vars);
OPT(nir_opt_combine_stores, nir_var_all);
if (is_scalar) {
OPT(nir_lower_alu_to_scalar, NULL, NULL);
} else {
OPT(nir_opt_shrink_stores, true);
OPT(nir_opt_shrink_vectors, false);
}
OPT(nir_copy_prop);
if (is_scalar) {
OPT(nir_lower_phis_to_scalar, NULL, NULL);
}
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_opt_cse);
OPT(nir_opt_combine_stores, nir_var_all);
/* Passing 0 to the peephole select pass causes it to convert
* if-statements that contain only move instructions in the branches
* regardless of the count.
*
* Passing 1 to the peephole select pass causes it to convert
* if-statements that contain at most a single ALU instruction (total)
* in both branches. Before Gfx6, some math instructions were
* prohibitively expensive and the results of compare operations need an
* extra resolve step. For these reasons, this pass is more harmful
* than good on those platforms.
*
* For indirect loads of uniforms (push constants), we assume that array
* indices will nearly always be in bounds and the cost of the load is
* low. Therefore there shouldn't be a performance benefit to avoid it.
* However, in vec4 tessellation shaders, these loads operate by
* actually pulling from memory.
*/
const bool is_vec4_tessellation = !is_scalar &&
(nir->info.stage == MESA_SHADER_TESS_CTRL ||
nir->info.stage == MESA_SHADER_TESS_EVAL);
nir_opt_peephole_select_options peephole_select_options = {
.limit = 0,
.indirect_load_ok = !is_vec4_tessellation,
};
OPT(nir_opt_peephole_select, &peephole_select_options);
peephole_select_options.limit = 8;
peephole_select_options.expensive_alu_ok = devinfo->ver >= 6;
OPT(nir_opt_peephole_select, &peephole_select_options);
OPT(nir_opt_intrinsics);
OPT(nir_opt_idiv_const, 32);
OPT(nir_opt_algebraic);
/* BFI2 did not exist until Gfx7, so there's no point in trying to
* optimize an instruction that should not get generated.
*/
if (devinfo->ver >= 7)
OPT(nir_opt_reassociate_bfi);
OPT(nir_lower_constant_convert_alu_types);
OPT(nir_opt_constant_folding);
if (lower_flrp != 0) {
if (OPT(nir_lower_flrp,
lower_flrp,
false /* always_precise */)) {
OPT(nir_opt_constant_folding);
}
/* Nothing should rematerialize any flrps, so we only need to do this
* lowering once.
*/
lower_flrp = 0;
}
OPT(nir_opt_dead_cf);
if (OPT(nir_opt_loop)) {
/* If nir_opt_loop makes progress, then we need to clean
* things up if we want any hope of nir_opt_if or nir_opt_loop_unroll
* to make progress.
*/
OPT(nir_copy_prop);
OPT(nir_opt_dce);
}
OPT(nir_opt_if, nir_opt_if_optimize_phi_true_false);
nir_opt_peephole_select_options peephole_discard_options = {
.limit = 0,
.discard_ok = true,
};
OPT(nir_opt_peephole_select, &peephole_discard_options);
if (nir->options->max_unroll_iterations != 0) {
OPT(nir_opt_loop_unroll);
}
OPT(nir_opt_remove_phis);
OPT(nir_opt_gcm, false);
OPT(nir_opt_undef);
OPT(nir_lower_pack);
} while (progress);
/* Workaround Gfxbench unused local sampler variable which will trigger an
* assert in the opt_large_constants pass.
*/
OPT(nir_remove_dead_variables, nir_var_function_temp, NULL);
}
static unsigned
lower_bit_size_callback(const nir_instr *instr, UNUSED void *data)
{
switch (instr->type) {
case nir_instr_type_alu: {
nir_alu_instr *alu = nir_instr_as_alu(instr);
switch (alu->op) {
case nir_op_bit_count:
case nir_op_ufind_msb:
case nir_op_ifind_msb:
case nir_op_find_lsb:
/* These are handled specially because the destination is always
* 32-bit and so the bit size of the instruction is given by the
* source.
*/
return alu->src[0].src.ssa->bit_size >= 32 ? 0 : 32;
default:
break;
}
if (alu->def.bit_size >= 32)
return 0;
/* Note: nir_op_iabs and nir_op_ineg are not lowered here because the
* 8-bit ABS or NEG instruction should eventually get copy propagated
* into the MOV that does the type conversion. This results in far
* fewer MOV instructions.
*/
switch (alu->op) {
case nir_op_idiv:
case nir_op_imod:
case nir_op_irem:
case nir_op_udiv:
case nir_op_umod:
case nir_op_fceil:
case nir_op_ffloor:
case nir_op_ffract:
case nir_op_fround_even:
case nir_op_ftrunc:
return 32;
case nir_op_frcp:
case nir_op_frsq:
case nir_op_fsqrt:
case nir_op_fpow:
case nir_op_fexp2:
case nir_op_flog2:
case nir_op_fsin:
case nir_op_fcos:
return 32;
case nir_op_isign:
unreachable("Should have been lowered by nir_opt_algebraic.");
default:
if (nir_op_infos[alu->op].num_inputs >= 2 &&
alu->def.bit_size == 8)
return 16;
if (nir_alu_instr_is_comparison(alu) &&
alu->src[0].src.ssa->bit_size == 8)
return 16;
return 0;
}
break;
}
case nir_instr_type_intrinsic: {
nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
switch (intrin->intrinsic) {
case nir_intrinsic_read_invocation:
case nir_intrinsic_read_first_invocation:
case nir_intrinsic_vote_feq:
case nir_intrinsic_vote_ieq:
case nir_intrinsic_shuffle:
case nir_intrinsic_shuffle_xor:
case nir_intrinsic_shuffle_up:
case nir_intrinsic_shuffle_down:
case nir_intrinsic_quad_broadcast:
case nir_intrinsic_quad_swap_horizontal:
case nir_intrinsic_quad_swap_vertical:
case nir_intrinsic_quad_swap_diagonal:
if (intrin->src[0].ssa->bit_size == 8)
return 16;
return 0;
case nir_intrinsic_reduce:
case nir_intrinsic_inclusive_scan:
case nir_intrinsic_exclusive_scan:
/* There are a couple of register region issues that make things
* complicated for 8-bit types:
*
* 1. Only raw moves are allowed to write to a packed 8-bit
* destination.
* 2. If we use a strided destination, the efficient way to do
* scan operations ends up using strides that are too big to
* encode in an instruction.
*
* To get around these issues, we just do all 8-bit scan operations
* in 16 bits. It's actually fewer instructions than what we'd have
* to do if we were trying to do it in native 8-bit types and the
* results are the same once we truncate to 8 bits at the end.
*/
if (intrin->def.bit_size == 8)
return 16;
return 0;
default:
return 0;
}
break;
}
case nir_instr_type_phi: {
nir_phi_instr *phi = nir_instr_as_phi(instr);
if (phi->def.bit_size == 8)
return 16;
return 0;
}
default:
return 0;
}
}
/* On gfx12.5+, if the offsets are not both constant and in the {-8,7} range,
* we will have nir_lower_tex() lower the source offset by returning true from
* this filter function.
*/
static bool
lower_xehp_tg4_offset_filter(const nir_instr *instr, UNUSED const void *data)
{
if (instr->type != nir_instr_type_tex)
return false;
nir_tex_instr *tex = nir_instr_as_tex(instr);
if (tex->op != nir_texop_tg4)
return false;
int offset_index = nir_tex_instr_src_index(tex, nir_tex_src_offset);
if (offset_index < 0)
return false;
if (!nir_src_is_const(tex->src[offset_index].src))
return true;
int64_t offset_x = nir_src_comp_as_int(tex->src[offset_index].src, 0);
int64_t offset_y = nir_src_comp_as_int(tex->src[offset_index].src, 1);
return offset_x < -8 || offset_x > 7 || offset_y < -8 || offset_y > 7;
}
/* Does some simple lowering and runs the standard suite of optimizations
*
* This is intended to be called more-or-less directly after you get the
* shader out of GLSL or some other source. While it is geared towards i965,
* it is not at all generator-specific.
*/
void
elk_preprocess_nir(const struct elk_compiler *compiler, nir_shader *nir,
const struct elk_nir_compiler_opts *opts)
{
const struct intel_device_info *devinfo = compiler->devinfo;
UNUSED bool progress; /* Written by OPT */
const bool is_scalar = compiler->scalar_stage[nir->info.stage];
nir_validate_ssa_dominance(nir, "before elk_preprocess_nir");
OPT(nir_lower_frexp);
if (is_scalar) {
OPT(nir_lower_alu_to_scalar, NULL, NULL);
}
if (nir->info.stage == MESA_SHADER_GEOMETRY)
OPT(nir_lower_gs_intrinsics, 0);
/* See also elk_nir_trig_workarounds.py */
if (compiler->precise_trig)
OPT(elk_nir_apply_trig_workarounds);
/* This workaround existing for performance reasons. Since it requires not
* setting RENDER_SURFACE_STATE::SurfaceArray when the array length is 1,
* we're loosing the HW robustness feature in that case.
*
* So when robust image access is enabled, just avoid the workaround.
*/
if (intel_needs_workaround(devinfo, 1806565034) && !opts->robust_image_access)
OPT(intel_nir_clamp_image_1d_2d_array_sizes);
const nir_lower_tex_options tex_options = {
.lower_txp = ~0,
.lower_txf_offset = true,
.lower_rect_offset = true,
.lower_txd_cube_map = true,
.lower_txb_shadow_clamp = true,
.lower_txd_shadow_clamp = true,
.lower_txd_offset_clamp = true,
.lower_tg4_offsets = true,
.lower_txs_lod = true, /* Wa_14012320009 */
.lower_invalid_implicit_lod = true,
};
OPT(nir_lower_tex, &tex_options);
OPT(nir_normalize_cubemap_coords);
OPT(nir_lower_global_vars_to_local);
OPT(nir_split_var_copies);
OPT(nir_split_struct_vars, nir_var_function_temp);
elk_nir_optimize(nir, is_scalar, devinfo);
OPT(nir_lower_doubles, opts->softfp64, nir->options->lower_doubles_options);
if (OPT(nir_lower_int64_float_conversions)) {
OPT(nir_opt_algebraic);
OPT(nir_lower_doubles, opts->softfp64,
nir->options->lower_doubles_options);
}
OPT(nir_lower_bit_size, lower_bit_size_callback, (void *)compiler);
/* Lower a bunch of stuff */
OPT(nir_lower_var_copies);
/* This needs to be run after the first optimization pass but before we
* lower indirect derefs away
*/
if (compiler->supports_shader_constants) {
OPT(nir_opt_large_constants, NULL, 32);
}
if (is_scalar) {
OPT(nir_lower_load_const_to_scalar);
}
OPT(nir_lower_system_values);
nir_lower_compute_system_values_options lower_csv_options = {
.has_base_workgroup_id = nir->info.stage == MESA_SHADER_COMPUTE,
};
OPT(nir_lower_compute_system_values, &lower_csv_options);
const nir_lower_subgroups_options subgroups_options = {
.ballot_bit_size = 32,
.ballot_components = 1,
.lower_to_scalar = true,
.lower_vote_trivial = !is_scalar,
.lower_relative_shuffle = true,
.lower_quad_broadcast_dynamic = true,
.lower_elect = true,
.lower_inverse_ballot = true,
.lower_rotate_to_shuffle = true,
};
OPT(nir_lower_subgroups, &subgroups_options);
nir_variable_mode indirect_mask =
elk_nir_no_indirect_mask(compiler, nir->info.stage);
OPT(nir_lower_indirect_derefs, indirect_mask, UINT32_MAX);
/* Even in cases where we can handle indirect temporaries via scratch, we
* it can still be expensive. Lower indirects on small arrays to
* conditional load/stores.
*
* The threshold of 16 was chosen semi-arbitrarily. The idea is that an
* indirect on an array of 16 elements is about 30 instructions at which
* point, you may be better off doing a send. With a SIMD8 program, 16
* floats is 1/8 of the entire register file. Any array larger than that
* is likely to cause pressure issues. Also, this value is sufficiently
* high that the benchmarks known to suffer from large temporary array
* issues are helped but nothing else in shader-db is hurt except for maybe
* that one kerbal space program shader.
*/
if (is_scalar && !(indirect_mask & nir_var_function_temp))
OPT(nir_lower_indirect_derefs, nir_var_function_temp, 16);
/* Lower array derefs of vectors for SSBO and UBO loads. For both UBOs and
* SSBOs, our back-end is capable of loading an entire vec4 at a time and
* we would like to take advantage of that whenever possible regardless of
* whether or not the app gives us full loads. This should allow the
* optimizer to combine UBO and SSBO load operations and save us some send
* messages.
*/
OPT(nir_lower_array_deref_of_vec,
nir_var_mem_ubo | nir_var_mem_ssbo, NULL,
nir_lower_direct_array_deref_of_vec_load);
/* Get rid of split copies */
elk_nir_optimize(nir, is_scalar, devinfo);
}
static bool
elk_nir_zero_inputs_instr(struct nir_builder *b, nir_intrinsic_instr *intrin,
void *data)
{
if (intrin->intrinsic != nir_intrinsic_load_deref)
return false;
nir_deref_instr *deref = nir_src_as_deref(intrin->src[0]);
if (!nir_deref_mode_is(deref, nir_var_shader_in))
return false;
if (deref->deref_type != nir_deref_type_var)
return false;
nir_variable *var = deref->var;
uint64_t zero_inputs = *(uint64_t *)data;
if (!(BITFIELD64_BIT(var->data.location) & zero_inputs))
return false;
b->cursor = nir_before_instr(&intrin->instr);
nir_def *zero = nir_imm_zero(b, 1, 32);
nir_def_replace(&intrin->def, zero);
return true;
}
static bool
elk_nir_zero_inputs(nir_shader *shader, uint64_t *zero_inputs)
{
return nir_shader_intrinsics_pass(shader, elk_nir_zero_inputs_instr,
nir_metadata_control_flow,
zero_inputs);
}
void
elk_nir_link_shaders(const struct elk_compiler *compiler,
nir_shader *producer, nir_shader *consumer)
{
const struct intel_device_info *devinfo = compiler->devinfo;
nir_lower_io_array_vars_to_elements(producer, consumer);
nir_validate_shader(producer, "after nir_lower_io_arrays_to_elements");
nir_validate_shader(consumer, "after nir_lower_io_arrays_to_elements");
const bool p_is_scalar = compiler->scalar_stage[producer->info.stage];
const bool c_is_scalar = compiler->scalar_stage[consumer->info.stage];
if (p_is_scalar && c_is_scalar) {
NIR_PASS(_, producer, nir_lower_io_vars_to_scalar, nir_var_shader_out);
NIR_PASS(_, consumer, nir_lower_io_vars_to_scalar, nir_var_shader_in);
elk_nir_optimize(producer, p_is_scalar, devinfo);
elk_nir_optimize(consumer, c_is_scalar, devinfo);
}
if (nir_link_opt_varyings(producer, consumer))
elk_nir_optimize(consumer, c_is_scalar, devinfo);
NIR_PASS(_, producer, nir_remove_dead_variables, nir_var_shader_out, NULL);
NIR_PASS(_, consumer, nir_remove_dead_variables, nir_var_shader_in, NULL);
if (nir_remove_unused_varyings(producer, consumer)) {
if (should_print_nir(producer)) {
printf("nir_remove_unused_varyings\n");
nir_print_shader(producer, stdout);
}
if (should_print_nir(consumer)) {
printf("nir_remove_unused_varyings\n");
nir_print_shader(consumer, stdout);
}
NIR_PASS(_, producer, nir_lower_global_vars_to_local);
NIR_PASS(_, consumer, nir_lower_global_vars_to_local);
/* The backend might not be able to handle indirects on
* temporaries so we need to lower indirects on any of the
* varyings we have demoted here.
*/
NIR_PASS(_, producer, nir_lower_indirect_derefs,
elk_nir_no_indirect_mask(compiler, producer->info.stage),
UINT32_MAX);
NIR_PASS(_, consumer, nir_lower_indirect_derefs,
elk_nir_no_indirect_mask(compiler, consumer->info.stage),
UINT32_MAX);
elk_nir_optimize(producer, p_is_scalar, devinfo);
elk_nir_optimize(consumer, c_is_scalar, devinfo);
}
NIR_PASS(_, producer, nir_opt_vectorize_io_vars, nir_var_shader_out);
if (producer->info.stage == MESA_SHADER_TESS_CTRL &&
producer->options->vectorize_tess_levels)
NIR_PASS(_, producer, nir_lower_tess_level_array_vars_to_vec);
NIR_PASS(_, producer, nir_opt_combine_stores, nir_var_shader_out);
NIR_PASS(_, consumer, nir_opt_vectorize_io_vars, nir_var_shader_in);
if (producer->info.stage != MESA_SHADER_TESS_CTRL) {
/* Calling lower_io_to_vector creates output variable writes with
* write-masks. On non-TCS outputs, the back-end can't handle it and we
* need to call nir_lower_io_vars_to_temporaries to get rid of them. This,
* in turn, creates temporary variables and extra copy_deref intrinsics
* that we need to clean up.
*/
NIR_PASS(_, producer, nir_lower_io_vars_to_temporaries,
nir_shader_get_entrypoint(producer), true, false);
NIR_PASS(_, producer, nir_lower_global_vars_to_local);
NIR_PASS(_, producer, nir_split_var_copies);
NIR_PASS(_, producer, nir_lower_var_copies);
}
}
static bool
elk_nir_should_vectorize_mem(unsigned align_mul, unsigned align_offset,
unsigned bit_size,
unsigned num_components,
int64_t hole_size,
nir_intrinsic_instr *low,
nir_intrinsic_instr *high,
void *data)
{
/* Don't combine things to generate 64-bit loads/stores. We have to split
* those back into 32-bit ones anyway and UBO loads aren't split in NIR so
* we don't want to make a mess for the back-end.
*/
if (bit_size > 32 || hole_size > 0 || !nir_num_components_valid(num_components))
return false;
if (low->intrinsic == nir_intrinsic_load_ubo_uniform_block_intel ||
low->intrinsic == nir_intrinsic_load_ssbo_uniform_block_intel ||
low->intrinsic == nir_intrinsic_load_shared_uniform_block_intel ||
low->intrinsic == nir_intrinsic_load_global_constant_uniform_block_intel) {
if (num_components > 4) {
if (!util_is_power_of_two_nonzero(num_components))
return false;
if (bit_size != 32)
return false;
if (num_components > 32)
return false;
}
} else {
/* We can handle at most a vec4 right now. Anything bigger would get
* immediately split by elk_nir_lower_mem_access_bit_sizes anyway.
*/
if (num_components > 4)
return false;
}
uint32_t align;
if (align_offset)
align = 1 << (ffs(align_offset) - 1);
else
align = align_mul;
if (align < bit_size / 8)
return false;
return true;
}
static
bool combine_all_memory_barriers(nir_intrinsic_instr *a,
nir_intrinsic_instr *b,
void *data)
{
/* Combine control barriers with identical memory semantics. This prevents
* the second barrier generating a spurious, identical fence message as the
* first barrier.
*/
if (nir_intrinsic_memory_modes(a) == nir_intrinsic_memory_modes(b) &&
nir_intrinsic_memory_semantics(a) == nir_intrinsic_memory_semantics(b) &&
nir_intrinsic_memory_scope(a) == nir_intrinsic_memory_scope(b)) {
nir_intrinsic_set_execution_scope(a, MAX2(nir_intrinsic_execution_scope(a),
nir_intrinsic_execution_scope(b)));
return true;
}
/* Only combine pure memory barriers */
if ((nir_intrinsic_execution_scope(a) != SCOPE_NONE) ||
(nir_intrinsic_execution_scope(b) != SCOPE_NONE))
return false;
/* Translation to backend IR will get rid of modes we don't care about, so
* no harm in always combining them.
*
* TODO: While HW has only ACQUIRE|RELEASE fences, we could improve the
* scheduling so that it can take advantage of the different semantics.
*/
nir_intrinsic_set_memory_modes(a, nir_intrinsic_memory_modes(a) |
nir_intrinsic_memory_modes(b));
nir_intrinsic_set_memory_semantics(a, nir_intrinsic_memory_semantics(a) |
nir_intrinsic_memory_semantics(b));
nir_intrinsic_set_memory_scope(a, MAX2(nir_intrinsic_memory_scope(a),
nir_intrinsic_memory_scope(b)));
return true;
}
static nir_mem_access_size_align
get_mem_access_size_align(nir_intrinsic_op intrin, uint8_t bytes,
uint8_t bit_size, uint32_t align_mul, uint32_t align_offset,
bool offset_is_const, enum gl_access_qualifier access,
const void *cb_data)
{
const uint32_t align = nir_combined_align(align_mul, align_offset);
switch (intrin) {
case nir_intrinsic_load_ssbo:
case nir_intrinsic_load_shared:
case nir_intrinsic_load_scratch:
/* The offset is constant so we can use a 32-bit load and just shift it
* around as needed.
*/
if (align < 4 && offset_is_const) {
assert(util_is_power_of_two_nonzero(align_mul) && align_mul >= 4);
const unsigned pad = align_offset % 4;
const unsigned comps32 = MIN2(DIV_ROUND_UP(bytes + pad, 4), 4);
return (nir_mem_access_size_align) {
.bit_size = 32,
.num_components = comps32,
.align = 4,
.shift = nir_mem_access_shift_method_scalar,
};
}
break;
default:
break;
}
const bool is_load = nir_intrinsic_infos[intrin].has_dest;
const bool is_scratch = intrin == nir_intrinsic_load_scratch ||
intrin == nir_intrinsic_store_scratch;
if (align < 4 || bytes < 4) {
/* Choose a byte, word, or dword */
bytes = MIN2(bytes, 4);
if (bytes == 3)
bytes = is_load ? 4 : 2;
if (is_scratch) {
/* The way scratch address swizzling works in the back-end, it
* happens at a DWORD granularity so we can't have a single load
* or store cross a DWORD boundary.
*/
if ((align_offset % 4) + bytes > MIN2(align_mul, 4))
bytes = MIN2(align_mul, 4) - (align_offset % 4);
/* Must be a power of two */
if (bytes == 3)
bytes = 2;
}
return (nir_mem_access_size_align) {
.bit_size = bytes * 8,
.num_components = 1,
.align = 1,
.shift = nir_mem_access_shift_method_scalar,
};
} else {
bytes = MIN2(bytes, 16);
return (nir_mem_access_size_align) {
.bit_size = 32,
.num_components = is_scratch ? 1 :
is_load ? DIV_ROUND_UP(bytes, 4) : bytes / 4,
.align = 4,
.shift = nir_mem_access_shift_method_scalar,
};
}
}
static void
elk_vectorize_lower_mem_access(nir_shader *nir,
const struct elk_compiler *compiler,
enum elk_robustness_flags robust_flags)
{
bool progress = false;
const bool is_scalar = compiler->scalar_stage[nir->info.stage];
if (is_scalar) {
nir_load_store_vectorize_options options = {
.modes = nir_var_mem_ubo | nir_var_mem_ssbo |
nir_var_mem_global | nir_var_mem_shared,
.callback = elk_nir_should_vectorize_mem,
.robust_modes = (nir_variable_mode)0,
};
if (robust_flags & ELK_ROBUSTNESS_UBO)
options.robust_modes |= nir_var_mem_ubo | nir_var_mem_global;
if (robust_flags & ELK_ROBUSTNESS_SSBO)
options.robust_modes |= nir_var_mem_ssbo | nir_var_mem_global;
OPT(nir_opt_load_store_vectorize, &options);
}
nir_lower_mem_access_bit_sizes_options mem_access_options = {
.modes = nir_var_mem_ssbo |
nir_var_mem_constant |
nir_var_shader_temp |
nir_var_function_temp |
nir_var_mem_global |
nir_var_mem_shared,
.callback = get_mem_access_size_align,
};
OPT(nir_lower_mem_access_bit_sizes, &mem_access_options);
while (progress) {
progress = false;
OPT(nir_lower_pack);
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_opt_cse);
OPT(nir_opt_algebraic);
OPT(nir_opt_constant_folding);
}
}
static bool
nir_shader_has_local_variables(const nir_shader *nir)
{
nir_foreach_function_impl(impl, nir) {
if (!exec_list_is_empty(&impl->locals))
return true;
}
return false;
}
/* Prepare the given shader for codegen
*
* This function is intended to be called right before going into the actual
* backend and is highly backend-specific. Also, once this function has been
* called on a shader, it will no longer be in SSA form so most optimizations
* will not work.
*/
void
elk_postprocess_nir(nir_shader *nir, const struct elk_compiler *compiler,
bool debug_enabled,
enum elk_robustness_flags robust_flags)
{
const struct intel_device_info *devinfo = compiler->devinfo;
const bool is_scalar = compiler->scalar_stage[nir->info.stage];
UNUSED bool progress; /* Written by OPT */
OPT(intel_nir_lower_sparse_intrinsics);
OPT(nir_lower_bit_size, lower_bit_size_callback, (void *)compiler);
OPT(nir_opt_combine_barriers, combine_all_memory_barriers, NULL);
do {
progress = false;
OPT(nir_opt_algebraic_before_ffma);
} while (progress);
elk_nir_optimize(nir, is_scalar, devinfo);
if (is_scalar && nir_shader_has_local_variables(nir)) {
OPT(nir_lower_vars_to_explicit_types, nir_var_function_temp,
glsl_get_natural_size_align_bytes);
OPT(nir_lower_explicit_io, nir_var_function_temp,
nir_address_format_32bit_offset);
elk_nir_optimize(nir, is_scalar, devinfo);
}
elk_vectorize_lower_mem_access(nir, compiler, robust_flags);
if (OPT(nir_lower_int64))
elk_nir_optimize(nir, is_scalar, devinfo);
if (devinfo->ver >= 6) {
/* Try and fuse multiply-adds, if successful, run shrink_vectors to
* avoid peephole_ffma to generate things like this :
* vec16 ssa_0 = ...
* vec16 ssa_1 = fneg ssa_0
* vec1 ssa_2 = ffma ssa_1, ...
*
* We want this instead :
* vec16 ssa_0 = ...
* vec1 ssa_1 = fneg ssa_0.x
* vec1 ssa_2 = ffma ssa_1, ...
*/
if (OPT(intel_nir_opt_peephole_ffma))
OPT(nir_opt_shrink_vectors, false);
}
if (is_scalar)
OPT(intel_nir_opt_peephole_imul32x16);
if (OPT(nir_opt_comparison_pre)) {
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_opt_cse);
/* Do the select peepehole again. nir_opt_comparison_pre (combined with
* the other optimization passes) will have removed at least one
* instruction from one of the branches of the if-statement, so now it
* might be under the threshold of conversion to bcsel.
*
* See elk_nir_optimize for the explanation of is_vec4_tessellation.
*/
const bool is_vec4_tessellation = !is_scalar &&
(nir->info.stage == MESA_SHADER_TESS_CTRL ||
nir->info.stage == MESA_SHADER_TESS_EVAL);
nir_opt_peephole_select_options peephole_select_options = {
.limit = 0,
.indirect_load_ok = !is_vec4_tessellation,
};
OPT(nir_opt_peephole_select, &peephole_select_options);
peephole_select_options.limit = 1;
peephole_select_options.expensive_alu_ok = compiler->devinfo->ver >= 6;
OPT(nir_opt_peephole_select, &peephole_select_options);
}
do {
progress = false;
if (OPT(nir_opt_algebraic_late)) {
/* At this late stage, anything that makes more constants will wreak
* havok on the vec4 backend. The handling of constants in the vec4
* backend is not good.
*/
if (is_scalar)
OPT(nir_opt_constant_folding);
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_opt_cse);
}
} while (progress);
if (OPT(nir_lower_fp16_casts, nir_lower_fp16_split_fp64)) {
if (OPT(nir_lower_int64)) {
elk_nir_optimize(nir, is_scalar, devinfo);
}
}
const nir_split_conversions_options split_conv_opts = {
.callback = intel_nir_split_conversions_cb,
};
OPT(nir_split_conversions, &split_conv_opts);
if (is_scalar)
OPT(nir_lower_alu_to_scalar, NULL, NULL);
while (OPT(nir_opt_algebraic_distribute_src_mods)) {
if (is_scalar)
OPT(nir_opt_constant_folding);
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_opt_cse);
}
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_opt_move, nir_move_comparisons);
OPT(nir_opt_dead_cf);
/* TODO: Enable nir_opt_uniform_atomics on Gfx7.x too.
* It currently fails Vulkan tests on Haswell for an unknown reason.
*/
bool opt_uniform_atomic_stage_allowed = devinfo->ver >= 8;
if (opt_uniform_atomic_stage_allowed && OPT(nir_opt_uniform_atomics, false)) {
const nir_lower_subgroups_options subgroups_options = {
.ballot_bit_size = 32,
.ballot_components = 1,
.lower_elect = true,
};
OPT(nir_lower_subgroups, &subgroups_options);
if (OPT(nir_lower_int64))
elk_nir_optimize(nir, is_scalar, devinfo);
}
/* Do this only after the last opt_gcm. GCM will undo this lowering. */
if (nir->info.stage == MESA_SHADER_FRAGMENT) {
OPT(intel_nir_lower_non_uniform_barycentric_at_sample);
}
OPT(nir_lower_bool_to_int32);
OPT(nir_copy_prop);
OPT(nir_opt_dce);
OPT(nir_lower_locals_to_regs, 32);
if (unlikely(debug_enabled)) {
/* Re-index SSA defs so we print more sensible numbers. */
nir_foreach_function_impl(impl, nir) {
nir_index_ssa_defs(impl);
}
fprintf(stderr, "NIR (SSA form) for %s shader:\n",
_mesa_shader_stage_to_string(nir->info.stage));
nir_print_shader(nir, stderr);
}
nir_validate_ssa_dominance(nir, "before nir_convert_from_ssa");
/* Rerun the divergence analysis before convert_from_ssa as this pass has
* some assert on consistent divergence flags.
*/
NIR_PASS(_, nir, nir_convert_to_lcssa, true, true);
nir_divergence_analysis(nir);
OPT(nir_convert_from_ssa, true, true);
if (!is_scalar) {
OPT(nir_move_vec_src_uses_to_dest, true);
OPT(nir_lower_vec_to_regs, NULL, NULL);
}
OPT(nir_opt_dce);
if (OPT(nir_opt_rematerialize_compares))
OPT(nir_opt_dce);
nir_trivialize_registers(nir);
/* This is the last pass we run before we start emitting stuff. It
* determines when we need to insert boolean resolves on Gen <= 5. We
* run it last because it stashes data in instr->pass_flags and we don't
* want that to be squashed by other NIR passes.
*/
if (devinfo->ver <= 5)
elk_nir_analyze_boolean_resolves(nir);
nir_sweep(nir);
if (unlikely(debug_enabled)) {
fprintf(stderr, "NIR (final form) for %s shader:\n",
_mesa_shader_stage_to_string(nir->info.stage));
nir_print_shader(nir, stderr);
}
}
static bool
elk_nir_apply_sampler_key(nir_shader *nir,
const struct elk_compiler *compiler,
const struct elk_sampler_prog_key_data *key_tex)
{
const struct intel_device_info *devinfo = compiler->devinfo;
nir_lower_tex_options tex_options = {
.lower_txd_clamp_bindless_sampler = true,
.lower_txd_clamp_if_sampler_index_not_lt_16 = true,
.lower_invalid_implicit_lod = true,
.lower_index_to_offset = true,
};
/* Iron Lake and prior require lowering of all rectangle textures */
if (devinfo->ver < 6)
tex_options.lower_rect = true;
/* Prior to Broadwell, our hardware can't actually do GL_CLAMP */
if (devinfo->ver < 8) {
tex_options.saturate_s = key_tex->gl_clamp_mask[0];
tex_options.saturate_t = key_tex->gl_clamp_mask[1];
tex_options.saturate_r = key_tex->gl_clamp_mask[2];
}
/* Prior to Haswell, we have to lower gradients on shadow samplers */
tex_options.lower_txd_shadow = devinfo->verx10 <= 70;
return nir_lower_tex(nir, &tex_options);
}
static unsigned
get_subgroup_size(const struct shader_info *info, unsigned max_subgroup_size)
{
switch (info->subgroup_size) {
case SUBGROUP_SIZE_API_CONSTANT:
/* We have to use the global constant size. */
return ELK_SUBGROUP_SIZE;
case SUBGROUP_SIZE_UNIFORM:
/* It has to be uniform across all invocations but can vary per stage
* if we want. This gives us a bit more freedom.
*
* For compute, elk_nir_apply_key is called per-dispatch-width so this
* is the actual subgroup size and not a maximum. However, we only
* invoke one size of any given compute shader so it's still guaranteed
* to be uniform across invocations.
*/
return max_subgroup_size;
case SUBGROUP_SIZE_VARYING:
/* The subgroup size is allowed to be fully varying. For geometry
* stages, we know it's always 8 which is max_subgroup_size so we can
* return that. For compute, elk_nir_apply_key is called once per
* dispatch-width so max_subgroup_size is the real subgroup size.
*
* For fragment, we return 0 and let it fall through to the back-end
* compiler. This means we can't optimize based on subgroup size but
* that's a risk the client took when it asked for a varying subgroup
* size.
*/
return info->stage == MESA_SHADER_FRAGMENT ? 0 : max_subgroup_size;
case SUBGROUP_SIZE_REQUIRE_4:
unreachable("Unsupported subgroup size type");
case SUBGROUP_SIZE_REQUIRE_8:
case SUBGROUP_SIZE_REQUIRE_16:
case SUBGROUP_SIZE_REQUIRE_32:
assert(gl_shader_stage_uses_workgroup(info->stage) ||
(info->stage >= MESA_SHADER_RAYGEN && info->stage <= MESA_SHADER_CALLABLE));
/* These enum values are expressly chosen to be equal to the subgroup
* size that they require.
*/
return info->subgroup_size;
case SUBGROUP_SIZE_FULL_SUBGROUPS:
case SUBGROUP_SIZE_REQUIRE_64:
case SUBGROUP_SIZE_REQUIRE_128:
break;
}
unreachable("Invalid subgroup size type");
}
unsigned
elk_nir_api_subgroup_size(const nir_shader *nir,
unsigned hw_subgroup_size)
{
return get_subgroup_size(&nir->info, hw_subgroup_size);
}
void
elk_nir_apply_key(nir_shader *nir,
const struct elk_compiler *compiler,
const struct elk_base_prog_key *key,
unsigned max_subgroup_size)
{
bool progress = false;
OPT(elk_nir_apply_sampler_key, compiler, &key->tex);
const nir_lower_subgroups_options subgroups_options = {
.subgroup_size = get_subgroup_size(&nir->info, max_subgroup_size),
.ballot_bit_size = 32,
.ballot_components = 1,
.lower_subgroup_masks = true,
};
OPT(nir_lower_subgroups, &subgroups_options);
if (key->limit_trig_input_range)
OPT(elk_nir_limit_trig_input_range_workaround);
if (progress) {
const bool is_scalar = compiler->scalar_stage[nir->info.stage];
elk_nir_optimize(nir, is_scalar, compiler->devinfo);
}
}
enum elk_conditional_mod
elk_cmod_for_nir_comparison(nir_op op)
{
switch (op) {
case nir_op_flt:
case nir_op_flt32:
case nir_op_ilt:
case nir_op_ilt32:
case nir_op_ult:
case nir_op_ult32:
return ELK_CONDITIONAL_L;
case nir_op_fge:
case nir_op_fge32:
case nir_op_ige:
case nir_op_ige32:
case nir_op_uge:
case nir_op_uge32:
return ELK_CONDITIONAL_GE;
case nir_op_feq:
case nir_op_feq32:
case nir_op_ieq:
case nir_op_ieq32:
case nir_op_b32all_fequal2:
case nir_op_b32all_iequal2:
case nir_op_b32all_fequal3:
case nir_op_b32all_iequal3:
case nir_op_b32all_fequal4:
case nir_op_b32all_iequal4:
return ELK_CONDITIONAL_Z;
case nir_op_fneu:
case nir_op_fneu32:
case nir_op_ine:
case nir_op_ine32:
case nir_op_b32any_fnequal2:
case nir_op_b32any_inequal2:
case nir_op_b32any_fnequal3:
case nir_op_b32any_inequal3:
case nir_op_b32any_fnequal4:
case nir_op_b32any_inequal4:
return ELK_CONDITIONAL_NZ;
default:
unreachable("Unsupported NIR comparison op");
}
}
enum elk_lsc_opcode
elk_lsc_aop_for_nir_intrinsic(const nir_intrinsic_instr *atomic)
{
switch (nir_intrinsic_atomic_op(atomic)) {
case nir_atomic_op_iadd: {
unsigned src_idx;
switch (atomic->intrinsic) {
case nir_intrinsic_image_atomic:
case nir_intrinsic_bindless_image_atomic:
src_idx = 3;
break;
case nir_intrinsic_ssbo_atomic:
src_idx = 2;
break;
case nir_intrinsic_shared_atomic:
case nir_intrinsic_global_atomic:
src_idx = 1;
break;
default:
unreachable("Invalid add atomic opcode");
}
if (nir_src_is_const(atomic->src[src_idx])) {
int64_t add_val = nir_src_as_int(atomic->src[src_idx]);
if (add_val == 1)
return LSC_OP_ATOMIC_INC;
else if (add_val == -1)
return LSC_OP_ATOMIC_DEC;
}
return LSC_OP_ATOMIC_ADD;
}
case nir_atomic_op_imin: return LSC_OP_ATOMIC_MIN;
case nir_atomic_op_umin: return LSC_OP_ATOMIC_UMIN;
case nir_atomic_op_imax: return LSC_OP_ATOMIC_MAX;
case nir_atomic_op_umax: return LSC_OP_ATOMIC_UMAX;
case nir_atomic_op_iand: return LSC_OP_ATOMIC_AND;
case nir_atomic_op_ior: return LSC_OP_ATOMIC_OR;
case nir_atomic_op_ixor: return LSC_OP_ATOMIC_XOR;
case nir_atomic_op_xchg: return LSC_OP_ATOMIC_STORE;
case nir_atomic_op_cmpxchg: return LSC_OP_ATOMIC_CMPXCHG;
case nir_atomic_op_fmin: return LSC_OP_ATOMIC_FMIN;
case nir_atomic_op_fmax: return LSC_OP_ATOMIC_FMAX;
case nir_atomic_op_fcmpxchg: return LSC_OP_ATOMIC_FCMPXCHG;
case nir_atomic_op_fadd: return LSC_OP_ATOMIC_FADD;
default:
unreachable("Unsupported NIR atomic intrinsic");
}
}
enum elk_reg_type
elk_type_for_nir_type(const struct intel_device_info *devinfo,
nir_alu_type type)
{
switch (type) {
case nir_type_uint:
case nir_type_uint32:
return ELK_REGISTER_TYPE_UD;
case nir_type_bool:
case nir_type_int:
case nir_type_bool32:
case nir_type_int32:
return ELK_REGISTER_TYPE_D;
case nir_type_float:
case nir_type_float32:
return ELK_REGISTER_TYPE_F;
case nir_type_float16:
return ELK_REGISTER_TYPE_HF;
case nir_type_float64:
return ELK_REGISTER_TYPE_DF;
case nir_type_int64:
return devinfo->ver < 8 ? ELK_REGISTER_TYPE_DF : ELK_REGISTER_TYPE_Q;
case nir_type_uint64:
return devinfo->ver < 8 ? ELK_REGISTER_TYPE_DF : ELK_REGISTER_TYPE_UQ;
case nir_type_int16:
return ELK_REGISTER_TYPE_W;
case nir_type_uint16:
return ELK_REGISTER_TYPE_UW;
case nir_type_int8:
return ELK_REGISTER_TYPE_B;
case nir_type_uint8:
return ELK_REGISTER_TYPE_UB;
default:
unreachable("unknown type");
}
return ELK_REGISTER_TYPE_F;
}
nir_shader *
elk_nir_create_passthrough_tcs(void *mem_ctx, const struct elk_compiler *compiler,
const struct elk_tcs_prog_key *key)
{
assert(key->input_vertices > 0);
const nir_shader_compiler_options *options =
compiler->nir_options[MESA_SHADER_TESS_CTRL];
uint64_t inputs_read = key->outputs_written &
~(VARYING_BIT_TESS_LEVEL_INNER | VARYING_BIT_TESS_LEVEL_OUTER);
unsigned locations[64];
unsigned num_locations = 0;
u_foreach_bit64(varying, inputs_read)
locations[num_locations++] = varying;
nir_shader *nir =
nir_create_passthrough_tcs_impl(options, locations, num_locations,
key->input_vertices);
ralloc_steal(mem_ctx, nir);
nir->info.inputs_read = inputs_read;
nir->info.tess._primitive_mode = key->_tes_primitive_mode;
nir_validate_shader(nir, "in elk_nir_create_passthrough_tcs");
struct elk_nir_compiler_opts opts = {};
elk_preprocess_nir(compiler, nir, &opts);
return nir;
}
nir_def *
elk_nir_load_global_const(nir_builder *b, nir_intrinsic_instr *load_uniform,
nir_def *base_addr, unsigned off)
{
assert(load_uniform->intrinsic == nir_intrinsic_load_uniform);
unsigned bit_size = load_uniform->def.bit_size;
assert(bit_size >= 8 && bit_size % 8 == 0);
unsigned byte_size = bit_size / 8;
nir_def *sysval;
if (nir_src_is_const(load_uniform->src[0])) {
uint64_t offset = off +
nir_intrinsic_base(load_uniform) +
nir_src_as_uint(load_uniform->src[0]);
/* Things should be component-aligned. */
assert(offset % byte_size == 0);
unsigned suboffset = offset % 64;
uint64_t aligned_offset = offset - suboffset;
/* Load two just in case we go over a 64B boundary */
nir_def *data[2];
for (unsigned i = 0; i < 2; i++) {
nir_def *addr = nir_iadd_imm(b, base_addr, aligned_offset + i * 64);
data[i] = nir_load_global_constant_uniform_block_intel(b, 16, 32, addr);
}
sysval = nir_extract_bits(b, data, 2, suboffset * 8,
load_uniform->num_components, bit_size);
} else {
nir_def *offset32 =
nir_iadd_imm(b, load_uniform->src[0].ssa,
off + nir_intrinsic_base(load_uniform));
nir_def *addr = nir_iadd(b, base_addr, nir_u2u64(b, offset32));
sysval = nir_load_global_constant(b, addr, byte_size,
load_uniform->num_components, bit_size);
}
return sysval;
}
const struct glsl_type *
elk_nir_get_var_type(const struct nir_shader *nir, nir_variable *var)
{
const struct glsl_type *type = var->interface_type;
if (!type) {
type = var->type;
if (nir_is_arrayed_io(var, nir->info.stage)) {
assert(glsl_type_is_array(type));
type = glsl_get_array_element(type);
}
}
return type;
}