diff options
Diffstat (limited to 'src/intel/compiler')
| -rw-r--r-- | src/intel/compiler/brw_fs.cpp | 318 |
1 files changed, 185 insertions, 133 deletions
diff --git a/src/intel/compiler/brw_fs.cpp b/src/intel/compiler/brw_fs.cpp index c5d4f5634df..fd51cace752 100644 --- a/src/intel/compiler/brw_fs.cpp +++ b/src/intel/compiler/brw_fs.cpp @@ -1906,62 +1906,6 @@ fs_visitor::compact_virtual_grfs() return progress; } -static void -set_push_pull_constant_loc(unsigned uniform, int *chunk_start, - unsigned *max_chunk_bitsize, - bool contiguous, unsigned bitsize, - const unsigned target_bitsize, - int *push_constant_loc, int *pull_constant_loc, - unsigned *num_push_constants, - unsigned *num_pull_constants, - const unsigned max_push_components, - const unsigned max_chunk_size, - bool allow_pull_constants, - struct brw_stage_prog_data *stage_prog_data) -{ - /* This is the first live uniform in the chunk */ - if (*chunk_start < 0) - *chunk_start = uniform; - - /* Keep track of the maximum bit size access in contiguous uniforms */ - *max_chunk_bitsize = MAX2(*max_chunk_bitsize, bitsize); - - /* If this element does not need to be contiguous with the next, we - * split at this point and everything between chunk_start and u forms a - * single chunk. - */ - if (!contiguous) { - /* If bitsize doesn't match the target one, skip it */ - if (*max_chunk_bitsize != target_bitsize) { - /* FIXME: right now we only support 32 and 64-bit accesses */ - assert(*max_chunk_bitsize == 4 || *max_chunk_bitsize == 8); - *max_chunk_bitsize = 0; - *chunk_start = -1; - return; - } - - unsigned chunk_size = uniform - *chunk_start + 1; - - /* Decide whether we should push or pull this parameter. In the - * Vulkan driver, push constants are explicitly exposed via the API - * so we push everything. In GL, we only push small arrays. - */ - if (!allow_pull_constants || - (*num_push_constants + chunk_size <= max_push_components && - chunk_size <= max_chunk_size)) { - assert(*num_push_constants + chunk_size <= max_push_components); - for (unsigned j = *chunk_start; j <= uniform; j++) - push_constant_loc[j] = (*num_push_constants)++; - } else { - for (unsigned j = *chunk_start; j <= uniform; j++) - pull_constant_loc[j] = (*num_pull_constants)++; - } - - *max_chunk_bitsize = 0; - *chunk_start = -1; - } -} - static int get_subgroup_id_param_index(const brw_stage_prog_data *prog_data) { @@ -1977,6 +1921,109 @@ get_subgroup_id_param_index(const brw_stage_prog_data *prog_data) } /** + * Struct for handling complex alignments. + * + * A complex alignment is stored as multiplier and an offset. A value is + * considered to be aligned if it is {offset} larger than a multiple of {mul}. + * For instance, with an alignment of {8, 2}, cplx_align_apply would do the + * following: + * + * N | cplx_align_apply({8, 2}, N) + * ----+----------------------------- + * 4 | 6 + * 6 | 6 + * 8 | 14 + * 10 | 14 + * 12 | 14 + * 14 | 14 + * 16 | 22 + */ +struct cplx_align { + unsigned mul:4; + unsigned offset:4; +}; + +#define CPLX_ALIGN_MAX_MUL 8 + +static void +cplx_align_assert_sane(struct cplx_align a) +{ + assert(a.mul > 0 && util_is_power_of_two(a.mul)); + assert(a.offset < a.mul); +} + +/** + * Combines two alignments to produce a least multiple of sorts. + * + * The returned alignment is the smallest (in terms of multiplier) such that + * anything aligned to both a and b will be aligned to the new alignment. + * This function will assert-fail if a and b are not compatible, i.e. if the + * offset parameters are such that no common alignment is possible. + */ +static struct cplx_align +cplx_align_combine(struct cplx_align a, struct cplx_align b) +{ + cplx_align_assert_sane(a); + cplx_align_assert_sane(b); + + /* Assert that the alignments agree. */ + assert((a.offset & (b.mul - 1)) == (b.offset & (a.mul - 1))); + + return a.mul > b.mul ? a : b; +} + +/** + * Apply a complex alignment + * + * This function will return the smallest number greater than or equal to + * offset that is aligned to align. + */ +static unsigned +cplx_align_apply(struct cplx_align align, unsigned offset) +{ + return ALIGN(offset - align.offset, align.mul) + align.offset; +} + +#define UNIFORM_SLOT_SIZE 4 + +struct uniform_slot_info { + /** True if the given uniform slot is live */ + unsigned is_live:1; + + /** True if this slot and the next slot must remain contiguous */ + unsigned contiguous:1; + + struct cplx_align align; +}; + +static void +mark_uniform_slots_read(struct uniform_slot_info *slots, + unsigned num_slots, unsigned alignment) +{ + assert(alignment > 0 && util_is_power_of_two(alignment)); + assert(alignment <= CPLX_ALIGN_MAX_MUL); + + /* We can't align a slot to anything less than the slot size */ + alignment = MAX2(alignment, UNIFORM_SLOT_SIZE); + + struct cplx_align align = {alignment, 0}; + cplx_align_assert_sane(align); + + for (unsigned i = 0; i < num_slots; i++) { + slots[i].is_live = true; + if (i < num_slots - 1) + slots[i].contiguous = true; + + align.offset = (i * UNIFORM_SLOT_SIZE) & (align.mul - 1); + if (slots[i].align.mul == 0) { + slots[i].align = align; + } else { + slots[i].align = cplx_align_combine(slots[i].align, align); + } + } +} + +/** * Assign UNIFORM file registers to either push constants or pull constants. * * We allow a fragment shader to have more than the specified minimum @@ -1994,60 +2041,44 @@ fs_visitor::assign_constant_locations() return; } - bool is_live[uniforms]; - memset(is_live, 0, sizeof(is_live)); - unsigned bitsize_access[uniforms]; - memset(bitsize_access, 0, sizeof(bitsize_access)); - - /* For each uniform slot, a value of true indicates that the given slot and - * the next slot must remain contiguous. This is used to keep us from - * splitting arrays and 64-bit values apart. - */ - bool contiguous[uniforms]; - memset(contiguous, 0, sizeof(contiguous)); + struct uniform_slot_info slots[uniforms]; + memset(slots, 0, sizeof(slots)); - /* First, we walk through the instructions and do two things: - * - * 1) Figure out which uniforms are live. - * - * 2) Mark any indirectly used ranges of registers as contiguous. - * - * Note that we don't move constant-indexed accesses to arrays. No - * testing has been done of the performance impact of this choice. - */ foreach_block_and_inst_safe(block, fs_inst, inst, cfg) { for (int i = 0 ; i < inst->sources; i++) { if (inst->src[i].file != UNIFORM) continue; - int constant_nr = inst->src[i].nr + inst->src[i].offset / 4; + /* NIR tightly packs things so the uniform number might not be + * aligned (if we have a double right after a float, for instance). + * This is fine because the process of re-arranging them will ensure + * that things are properly aligned. The offset into that uniform, + * however, must be aligned. + * + * In Vulkan, we have explicit offsets but everything is crammed + * into a single "variable" so inst->src[i].nr will always be 0. + * Everything will be properly aligned relative to that one base. + */ + assert(inst->src[i].offset % type_sz(inst->src[i].type) == 0); + + unsigned u = inst->src[i].nr + + inst->src[i].offset / UNIFORM_SLOT_SIZE; + if (u >= uniforms) + continue; + + unsigned slots_read; if (inst->opcode == SHADER_OPCODE_MOV_INDIRECT && i == 0) { - assert(inst->src[2].ud % 4 == 0); - unsigned last = constant_nr + (inst->src[2].ud / 4) - 1; - assert(last < uniforms); - - for (unsigned j = constant_nr; j < last; j++) { - is_live[j] = true; - contiguous[j] = true; - bitsize_access[j] = MAX2(bitsize_access[j], type_sz(inst->src[i].type)); - } - is_live[last] = true; - bitsize_access[last] = MAX2(bitsize_access[last], type_sz(inst->src[i].type)); + slots_read = DIV_ROUND_UP(inst->src[2].ud, UNIFORM_SLOT_SIZE); } else { - if (constant_nr >= 0 && constant_nr < (int) uniforms) { - int regs_read = inst->components_read(i) * - type_sz(inst->src[i].type) / 4; - assert(regs_read <= 2); - if (regs_read == 2) - contiguous[constant_nr] = true; - for (int j = 0; j < regs_read; j++) { - is_live[constant_nr + j] = true; - bitsize_access[constant_nr + j] = - MAX2(bitsize_access[constant_nr + j], type_sz(inst->src[i].type)); - } - } + unsigned bytes_read = inst->components_read(i) * + type_sz(inst->src[i].type); + slots_read = DIV_ROUND_UP(bytes_read, UNIFORM_SLOT_SIZE); } + + assert(u + slots_read <= uniforms); + mark_uniform_slots_read(&slots[u], slots_read, + type_sz(inst->src[i].type)); } } @@ -2082,43 +2113,64 @@ fs_visitor::assign_constant_locations() memset(pull_constant_loc, -1, uniforms * sizeof(*pull_constant_loc)); int chunk_start = -1; - unsigned max_chunk_bitsize = 0; - - /* First push 64-bit uniforms to ensure they are properly aligned */ - const unsigned uniform_64_bit_size = type_sz(BRW_REGISTER_TYPE_DF); + struct cplx_align align; for (unsigned u = 0; u < uniforms; u++) { - if (!is_live[u]) + if (!slots[u].is_live) { + assert(chunk_start == -1); continue; + } - set_push_pull_constant_loc(u, &chunk_start, &max_chunk_bitsize, - contiguous[u], bitsize_access[u], - uniform_64_bit_size, - push_constant_loc, pull_constant_loc, - &num_push_constants, &num_pull_constants, - max_push_components, max_chunk_size, - compiler->supports_pull_constants, - stage_prog_data); + /* Skip subgroup_id_index to put it in the last push register. */ + if (subgroup_id_index == (int)u) + continue; - } + if (chunk_start == -1) { + chunk_start = u; + align = slots[u].align; + } else { + /* Offset into the chunk */ + unsigned chunk_offset = (u - chunk_start) * UNIFORM_SLOT_SIZE; - /* Then push the rest of uniforms */ - const unsigned uniform_32_bit_size = type_sz(BRW_REGISTER_TYPE_F); - for (unsigned u = 0; u < uniforms; u++) { - if (!is_live[u]) - continue; + /* Shift the slot alignment down by the chunk offset so it is + * comparable with the base chunk alignment. + */ + struct cplx_align slot_align = slots[u].align; + slot_align.offset = + (slot_align.offset - chunk_offset) & (align.mul - 1); - /* Skip subgroup_id_index to put it in the last push register. */ - if (subgroup_id_index == (int)u) + align = cplx_align_combine(align, slot_align); + } + + /* Sanity check the alignment */ + cplx_align_assert_sane(align); + + if (slots[u].contiguous) continue; - set_push_pull_constant_loc(u, &chunk_start, &max_chunk_bitsize, - contiguous[u], bitsize_access[u], - uniform_32_bit_size, - push_constant_loc, pull_constant_loc, - &num_push_constants, &num_pull_constants, - max_push_components, max_chunk_size, - compiler->supports_pull_constants, - stage_prog_data); + /* Adjust the alignment to be in terms of slots, not bytes */ + assert((align.mul & (UNIFORM_SLOT_SIZE - 1)) == 0); + assert((align.offset & (UNIFORM_SLOT_SIZE - 1)) == 0); + align.mul /= UNIFORM_SLOT_SIZE; + align.offset /= UNIFORM_SLOT_SIZE; + + unsigned push_start_align = cplx_align_apply(align, num_push_constants); + unsigned chunk_size = u - chunk_start + 1; + if (!compiler->supports_pull_constants || + (chunk_size < max_chunk_size && + push_start_align + chunk_size <= max_push_components)) { + /* Align up the number of push constants */ + num_push_constants = push_start_align; + for (unsigned i = 0; i < chunk_size; i++) + push_constant_loc[chunk_start + i] = num_push_constants++; + } else { + /* We need to pull this one */ + num_pull_constants = cplx_align_apply(align, num_pull_constants); + for (unsigned i = 0; i < chunk_size; i++) + pull_constant_loc[chunk_start + i] = num_pull_constants++; + } + + /* Reset the chunk and start again */ + chunk_start = -1; } /* Add the CS local thread ID uniform at the end of the push constants */ @@ -2131,8 +2183,8 @@ fs_visitor::assign_constant_locations() uint32_t *param = stage_prog_data->param; stage_prog_data->nr_params = num_push_constants; if (num_push_constants) { - stage_prog_data->param = ralloc_array(mem_ctx, uint32_t, - num_push_constants); + stage_prog_data->param = rzalloc_array(mem_ctx, uint32_t, + num_push_constants); } else { stage_prog_data->param = NULL; } @@ -2140,8 +2192,8 @@ fs_visitor::assign_constant_locations() assert(stage_prog_data->pull_param == NULL); if (num_pull_constants > 0) { stage_prog_data->nr_pull_params = num_pull_constants; - stage_prog_data->pull_param = ralloc_array(mem_ctx, uint32_t, - num_pull_constants); + stage_prog_data->pull_param = rzalloc_array(mem_ctx, uint32_t, + num_pull_constants); } /* Now that we know how many regular uniforms we'll push, reduce the |