/* * Copyright © 2014-2015 Broadcom * * 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 "nir.h" #include "nir_builder.h" /** @file nir_lower_alu_to_scalar.c * * Replaces nir_alu_instr operations with more than one channel used in the * arguments with individual per-channel operations. */ static void nir_alu_ssa_dest_init(nir_alu_instr *instr, unsigned num_components, unsigned bit_size) { nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components, bit_size, NULL); instr->dest.write_mask = (1 << num_components) - 1; } static void lower_reduction(nir_alu_instr *instr, nir_op chan_op, nir_op merge_op, nir_builder *builder) { unsigned num_components = nir_op_infos[instr->op].input_sizes[0]; nir_ssa_def *last = NULL; for (unsigned i = 0; i < num_components; i++) { nir_alu_instr *chan = nir_alu_instr_create(builder->shader, chan_op); nir_alu_ssa_dest_init(chan, 1, instr->dest.dest.ssa.bit_size); nir_alu_src_copy(&chan->src[0], &instr->src[0], chan); chan->src[0].swizzle[0] = chan->src[0].swizzle[i]; if (nir_op_infos[chan_op].num_inputs > 1) { assert(nir_op_infos[chan_op].num_inputs == 2); nir_alu_src_copy(&chan->src[1], &instr->src[1], chan); chan->src[1].swizzle[0] = chan->src[1].swizzle[i]; } chan->exact = instr->exact; nir_builder_instr_insert(builder, &chan->instr); if (i == 0) { last = &chan->dest.dest.ssa; } else { last = nir_build_alu(builder, merge_op, last, &chan->dest.dest.ssa, NULL, NULL); } } assert(instr->dest.write_mask == 1); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(last)); nir_instr_remove(&instr->instr); } static bool lower_alu_instr_scalar(nir_alu_instr *instr, nir_builder *b) { unsigned num_src = nir_op_infos[instr->op].num_inputs; unsigned i, chan; assert(instr->dest.dest.is_ssa); assert(instr->dest.write_mask != 0); b->cursor = nir_before_instr(&instr->instr); b->exact = instr->exact; #define LOWER_REDUCTION(name, chan, merge) \ case name##2: \ case name##3: \ case name##4: \ lower_reduction(instr, chan, merge, b); \ return true; switch (instr->op) { case nir_op_vec4: case nir_op_vec3: case nir_op_vec2: /* We don't need to scalarize these ops, they're the ones generated to * group up outputs into a value that can be SSAed. */ return false; case nir_op_pack_half_2x16: if (!b->shader->options->lower_pack_half_2x16) return false; nir_ssa_def *val = nir_pack_half_2x16_split(b, nir_channel(b, instr->src[0].src.ssa, instr->src[0].swizzle[0]), nir_channel(b, instr->src[0].src.ssa, instr->src[0].swizzle[1])); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val)); nir_instr_remove(&instr->instr); return true; case nir_op_unpack_unorm_4x8: case nir_op_unpack_snorm_4x8: case nir_op_unpack_unorm_2x16: case nir_op_unpack_snorm_2x16: /* There is no scalar version of these ops, unless we were to break it * down to bitshifts and math (which is definitely not intended). */ return false; case nir_op_unpack_half_2x16: { if (!b->shader->options->lower_unpack_half_2x16) return false; nir_ssa_def *comps[2]; comps[0] = nir_unpack_half_2x16_split_x(b, instr->src[0].src.ssa); comps[1] = nir_unpack_half_2x16_split_y(b, instr->src[0].src.ssa); nir_ssa_def *vec = nir_vec(b, comps, 2); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(vec)); nir_instr_remove(&instr->instr); return true; } case nir_op_pack_uvec2_to_uint: { assert(b->shader->options->lower_pack_snorm_2x16 || b->shader->options->lower_pack_unorm_2x16); nir_ssa_def *word = nir_extract_u16(b, instr->src[0].src.ssa, nir_imm_int(b, 0)); nir_ssa_def *val = nir_ior(b, nir_ishl(b, nir_channel(b, word, 1), nir_imm_int(b, 16)), nir_channel(b, word, 0)); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val)); nir_instr_remove(&instr->instr); break; } case nir_op_pack_uvec4_to_uint: { assert(b->shader->options->lower_pack_snorm_4x8 || b->shader->options->lower_pack_unorm_4x8); nir_ssa_def *byte = nir_extract_u8(b, instr->src[0].src.ssa, nir_imm_int(b, 0)); nir_ssa_def *val = nir_ior(b, nir_ior(b, nir_ishl(b, nir_channel(b, byte, 3), nir_imm_int(b, 24)), nir_ishl(b, nir_channel(b, byte, 2), nir_imm_int(b, 16))), nir_ior(b, nir_ishl(b, nir_channel(b, byte, 1), nir_imm_int(b, 8)), nir_channel(b, byte, 0))); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val)); nir_instr_remove(&instr->instr); break; } case nir_op_fdph: { nir_ssa_def *sum[4]; for (unsigned i = 0; i < 3; i++) { sum[i] = nir_fmul(b, nir_channel(b, instr->src[0].src.ssa, instr->src[0].swizzle[i]), nir_channel(b, instr->src[1].src.ssa, instr->src[1].swizzle[i])); } sum[3] = nir_channel(b, instr->src[1].src.ssa, instr->src[1].swizzle[3]); nir_ssa_def *val = nir_fadd(b, nir_fadd(b, sum[0], sum[1]), nir_fadd(b, sum[2], sum[3])); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val)); nir_instr_remove(&instr->instr); return true; } case nir_op_unpack_double_2x32: return false; LOWER_REDUCTION(nir_op_fdot, nir_op_fmul, nir_op_fadd); LOWER_REDUCTION(nir_op_ball_fequal, nir_op_feq, nir_op_iand); LOWER_REDUCTION(nir_op_ball_iequal, nir_op_ieq, nir_op_iand); LOWER_REDUCTION(nir_op_bany_fnequal, nir_op_fne, nir_op_ior); LOWER_REDUCTION(nir_op_bany_inequal, nir_op_ine, nir_op_ior); LOWER_REDUCTION(nir_op_fall_equal, nir_op_seq, nir_op_fand); LOWER_REDUCTION(nir_op_fany_nequal, nir_op_sne, nir_op_for); default: break; } if (instr->dest.dest.ssa.num_components == 1) return false; unsigned num_components = instr->dest.dest.ssa.num_components; nir_ssa_def *comps[] = { NULL, NULL, NULL, NULL }; for (chan = 0; chan < 4; chan++) { if (!(instr->dest.write_mask & (1 << chan))) continue; nir_alu_instr *lower = nir_alu_instr_create(b->shader, instr->op); for (i = 0; i < num_src; i++) { /* We only handle same-size-as-dest (input_sizes[] == 0) or scalar * args (input_sizes[] == 1). */ assert(nir_op_infos[instr->op].input_sizes[i] < 2); unsigned src_chan = (nir_op_infos[instr->op].input_sizes[i] == 1 ? 0 : chan); nir_alu_src_copy(&lower->src[i], &instr->src[i], lower); for (int j = 0; j < 4; j++) lower->src[i].swizzle[j] = instr->src[i].swizzle[src_chan]; } nir_alu_ssa_dest_init(lower, 1, instr->dest.dest.ssa.bit_size); lower->dest.saturate = instr->dest.saturate; comps[chan] = &lower->dest.dest.ssa; lower->exact = instr->exact; nir_builder_instr_insert(b, &lower->instr); } nir_ssa_def *vec = nir_vec(b, comps, num_components); nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(vec)); nir_instr_remove(&instr->instr); return true; } static bool nir_lower_alu_to_scalar_impl(nir_function_impl *impl) { nir_builder builder; nir_builder_init(&builder, impl); bool progress = false; nir_foreach_block(block, impl) { nir_foreach_instr_safe(instr, block) { if (instr->type == nir_instr_type_alu) { progress = lower_alu_instr_scalar(nir_instr_as_alu(instr), &builder) || progress; } } } nir_metadata_preserve(impl, nir_metadata_block_index | nir_metadata_dominance); return progress; } bool nir_lower_alu_to_scalar(nir_shader *shader) { bool progress = false; nir_foreach_function(function, shader) { if (function->impl) progress = nir_lower_alu_to_scalar_impl(function->impl) || progress; } return progress; }