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nir: Add alignment parameters to SSBO, UBO, and shared access

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This also changes spirv_to_nir and glsl_to_nir to set them.  The one
place that doesn't set them is shared memory access lowering in
nir_lower_io.  That will have to be updated before any consumers of it
can effectively use these new alignments.

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Acked-by: Karol Herbst <kherbst@redhat.com>
This commit is contained in:
Jason Ekstrand
2018-11-13 09:45:03 -06:00
parent fb127f7729
commit d34fd81e76
7 changed files with 85 additions and 10 deletions
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14
src/compiler/glsl/glsl_to_nir.cpp
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@@ -33,6 +33,7 @@
#include "compiler/nir/nir_builder.h"
#include "main/imports.h"
#include "main/mtypes.h"
#include "util/u_math.h"
/*
* pass to lower GLSL IR to NIR
@@ -603,6 +604,14 @@ nir_visitor::visit(ir_return *ir)
nir_builder_instr_insert(&b, &instr->instr);
}
static void
intrinsic_set_std430_align(nir_intrinsic_instr *intrin, const glsl_type *type)
{
unsigned bit_size = type->is_boolean() ? 32 : glsl_get_bit_size(type);
unsigned pow2_components = util_next_power_of_two(type->vector_elements);
nir_intrinsic_set_align(intrin, (bit_size / 8) * pow2_components, 0);
}
void
nir_visitor::visit(ir_call *ir)
{
@@ -1006,6 +1015,7 @@ nir_visitor::visit(ir_call *ir)
instr->src[0] = nir_src_for_ssa(nir_val);
instr->src[1] = nir_src_for_ssa(evaluate_rvalue(block));
instr->src[2] = nir_src_for_ssa(evaluate_rvalue(offset));
intrinsic_set_std430_align(instr, val->type);
nir_intrinsic_set_write_mask(instr, write_mask->value.u[0]);
instr->num_components = val->type->vector_elements;
@@ -1024,6 +1034,7 @@ nir_visitor::visit(ir_call *ir)
const glsl_type *type = ir->return_deref->var->type;
instr->num_components = type->vector_elements;
intrinsic_set_std430_align(instr, type);
/* Setup destination register */
unsigned bit_size = type->is_boolean() ? 32 : glsl_get_bit_size(type);
@@ -1101,6 +1112,7 @@ nir_visitor::visit(ir_call *ir)
const glsl_type *type = ir->return_deref->var->type;
instr->num_components = type->vector_elements;
intrinsic_set_std430_align(instr, type);
/* Setup destination register */
unsigned bit_size = type->is_boolean() ? 32 : glsl_get_bit_size(type);
@@ -1131,6 +1143,7 @@ nir_visitor::visit(ir_call *ir)
instr->src[0] = nir_src_for_ssa(nir_val);
instr->num_components = val->type->vector_elements;
intrinsic_set_std430_align(instr, val->type);
nir_builder_instr_insert(&b, &instr->instr);
break;
@@ -1388,6 +1401,7 @@ nir_visitor::visit(ir_expression *ir)
load->num_components = ir->type->vector_elements;
load->src[0] = nir_src_for_ssa(evaluate_rvalue(ir->operands[0]));
load->src[1] = nir_src_for_ssa(evaluate_rvalue(ir->operands[1]));
intrinsic_set_std430_align(load, ir->type);
add_instr(&load->instr, ir->type->vector_elements, bit_size);
/*

41
src/compiler/nir/nir.h
View File

@@ -34,6 +34,7 @@
#include "util/list.h"
#include "util/ralloc.h"
#include "util/set.h"
#include "util/bitscan.h"
#include "util/bitset.h"
#include "util/macros.h"
#include "compiler/nir_types.h"
@@ -1248,6 +1249,18 @@ typedef enum {
*/
NIR_INTRINSIC_ACCESS = 16,
/**
* Alignment for offsets and addresses
*
* These two parameters, specify an alignment in terms of a multiplier and
* an offset. The offset or address parameter X of the intrinsic is
* guaranteed to satisfy the following:
*
* (X - align_offset) % align_mul == 0
*/
NIR_INTRINSIC_ALIGN_MUL = 17,
NIR_INTRINSIC_ALIGN_OFFSET = 18,
NIR_INTRINSIC_NUM_INDEX_FLAGS,
} nir_intrinsic_index_flag;
@@ -1342,6 +1355,34 @@ INTRINSIC_IDX_ACCESSORS(image_dim, IMAGE_DIM, enum glsl_sampler_dim)
INTRINSIC_IDX_ACCESSORS(image_array, IMAGE_ARRAY, bool)
INTRINSIC_IDX_ACCESSORS(access, ACCESS, enum gl_access_qualifier)
INTRINSIC_IDX_ACCESSORS(format, FORMAT, unsigned)
INTRINSIC_IDX_ACCESSORS(align_mul, ALIGN_MUL, unsigned)
INTRINSIC_IDX_ACCESSORS(align_offset, ALIGN_OFFSET, unsigned)
static inline void
nir_intrinsic_set_align(nir_intrinsic_instr *intrin,
unsigned align_mul, unsigned align_offset)
{
assert(util_is_power_of_two_nonzero(align_mul));
assert(align_offset < align_mul);
nir_intrinsic_set_align_mul(intrin, align_mul);
nir_intrinsic_set_align_offset(intrin, align_offset);
}
/** Returns a simple alignment for a load/store intrinsic offset
*
* Instead of the full mul+offset alignment scheme provided by the ALIGN_MUL
* and ALIGN_OFFSET parameters, this helper takes both into account and
* provides a single simple alignment parameter. The offset X is guaranteed
* to satisfy X % align == 0.
*/
static inline unsigned
nir_intrinsic_align(nir_intrinsic_instr *intrin)
{
const unsigned align_mul = nir_intrinsic_align_mul(intrin);
const unsigned align_offset = nir_intrinsic_align_offset(intrin);
assert(align_offset < align_mul);
return align_offset ? 1 << (ffs(align_offset) - 1) : align_mul;
}
/**
* \group texture information

26
src/compiler/nir/nir_intrinsics.py
View File

@@ -109,6 +109,9 @@ IMAGE_ARRAY = "NIR_INTRINSIC_IMAGE_ARRAY"
ACCESS = "NIR_INTRINSIC_ACCESS"
# Image format for image intrinsics
FORMAT = "NIR_INTRINSIC_FORMAT"
# Offset or address alignment
ALIGN_MUL = "NIR_INTRINSIC_ALIGN_MUL"
ALIGN_OFFSET = "NIR_INTRINSIC_ALIGN_OFFSET"
#
# Possible flags:
@@ -554,8 +557,8 @@ def load(name, num_srcs, indices=[], flags=[]):
# src[] = { offset }. const_index[] = { base, range }
load("uniform", 1, [BASE, RANGE], [CAN_ELIMINATE, CAN_REORDER])
# src[] = { buffer_index, offset }. No const_index
load("ubo", 2, flags=[CAN_ELIMINATE, CAN_REORDER])
# src[] = { buffer_index, offset }. const_index[] = { align_mul, align_offset }
load("ubo", 2, [ALIGN_MUL, ALIGN_OFFSET], flags=[CAN_ELIMINATE, CAN_REORDER])
# src[] = { offset }. const_index[] = { base, component }
load("input", 1, [BASE, COMPONENT], [CAN_ELIMINATE, CAN_REORDER])
# src[] = { vertex, offset }. const_index[] = { base, component }
@@ -564,14 +567,15 @@ load("per_vertex_input", 2, [BASE, COMPONENT], [CAN_ELIMINATE, CAN_REORDER])
intrinsic("load_interpolated_input", src_comp=[2, 1], dest_comp=0,
indices=[BASE, COMPONENT], flags=[CAN_ELIMINATE, CAN_REORDER])
# src[] = { buffer_index, offset }. No const_index
load("ssbo", 2, flags=[CAN_ELIMINATE], indices=[ACCESS])
# src[] = { buffer_index, offset }.
# const_index[] = { access, align_mul, align_offset }
load("ssbo", 2, [ACCESS, ALIGN_MUL, ALIGN_OFFSET], [CAN_ELIMINATE])
# src[] = { offset }. const_index[] = { base, component }
load("output", 1, [BASE, COMPONENT], flags=[CAN_ELIMINATE])
# src[] = { vertex, offset }. const_index[] = { base }
load("per_vertex_output", 2, [BASE, COMPONENT], [CAN_ELIMINATE])
# src[] = { offset }. const_index[] = { base }
load("shared", 1, [BASE], [CAN_ELIMINATE])
# src[] = { offset }. const_index[] = { base, align_mul, align_offset }
load("shared", 1, [BASE, ALIGN_MUL, ALIGN_OFFSET], [CAN_ELIMINATE])
# src[] = { offset }. const_index[] = { base, range }
load("push_constant", 1, [BASE, RANGE], [CAN_ELIMINATE, CAN_REORDER])
# src[] = { offset }. const_index[] = { base, range }
@@ -590,7 +594,9 @@ store("output", 2, [BASE, WRMASK, COMPONENT])
# src[] = { value, vertex, offset }.
# const_index[] = { base, write_mask, component }
store("per_vertex_output", 3, [BASE, WRMASK, COMPONENT])
# src[] = { value, block_index, offset }. const_index[] = { write_mask }
store("ssbo", 3, [WRMASK, ACCESS])
# src[] = { value, offset }. const_index[] = { base, write_mask }
store("shared", 2, [BASE, WRMASK])
# src[] = { value, block_index, offset }
# const_index[] = { write_mask, access, align_mul, align_offset }
store("ssbo", 3, [WRMASK, ACCESS, ALIGN_MUL, ALIGN_OFFSET])
# src[] = { value, offset }.
# const_index[] = { base, write_mask, align_mul, align_offset }
store("shared", 2, [BASE, WRMASK, ALIGN_MUL, ALIGN_OFFSET])

4
src/compiler/nir/nir_lower_atomics_to_ssbo.c
View File

@@ -149,6 +149,10 @@ lower_instr(nir_intrinsic_instr *instr, unsigned ssbo_offset, nir_builder *b)
break;
}
if (new_instr->intrinsic == nir_intrinsic_load_ssbo ||
new_instr->intrinsic == nir_intrinsic_store_ssbo)
nir_intrinsic_set_align(new_instr, 4, 0);
nir_ssa_dest_init(&new_instr->instr, &new_instr->dest,
instr->dest.ssa.num_components,
instr->dest.ssa.bit_size, NULL);

2
src/compiler/nir/nir_print.c
View File

@@ -691,6 +691,8 @@ print_intrinsic_instr(nir_intrinsic_instr *instr, print_state *state)
[NIR_INTRINSIC_IMAGE_ARRAY] = "image_array",
[NIR_INTRINSIC_ACCESS] = "access",
[NIR_INTRINSIC_FORMAT] = "format",
[NIR_INTRINSIC_ALIGN_MUL] = "align_mul",
[NIR_INTRINSIC_ALIGN_OFFSET] = "align_offset",
};
for (unsigned idx = 1; idx < NIR_INTRINSIC_NUM_INDEX_FLAGS; idx++) {
if (!info->index_map[idx])

2
src/compiler/spirv/spirv_to_nir.c
View File

@@ -2762,6 +2762,7 @@ vtn_handle_atomics(struct vtn_builder *b, SpvOp opcode,
switch (opcode) {
case SpvOpAtomicLoad:
atomic->num_components = glsl_get_vector_elements(ptr->type->type);
nir_intrinsic_set_align(atomic, 4, 0);
if (ptr->mode == vtn_variable_mode_ssbo)
atomic->src[src++] = nir_src_for_ssa(index);
atomic->src[src++] = nir_src_for_ssa(offset);
@@ -2770,6 +2771,7 @@ vtn_handle_atomics(struct vtn_builder *b, SpvOp opcode,
case SpvOpAtomicStore:
atomic->num_components = glsl_get_vector_elements(ptr->type->type);
nir_intrinsic_set_write_mask(atomic, (1 << atomic->num_components) - 1);
nir_intrinsic_set_align(atomic, 4, 0);
atomic->src[src++] = nir_src_for_ssa(vtn_ssa_value(b, w[4])->def);
if (ptr->mode == vtn_variable_mode_ssbo)
atomic->src[src++] = nir_src_for_ssa(index);

6
src/compiler/spirv/vtn_variables.c
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@@ -646,6 +646,12 @@ _vtn_load_store_tail(struct vtn_builder *b, nir_intrinsic_op op, bool load,
nir_intrinsic_set_access(instr, access);
}
/* With extensions like relaxed_block_layout, we really can't guarantee
* much more than scalar alignment.
*/
if (op != nir_intrinsic_load_push_constant)
nir_intrinsic_set_align(instr, data_bit_size / 8, 0);
if (index)
instr->src[src++] = nir_src_for_ssa(index);