280 lines
9.5 KiB
C
280 lines
9.5 KiB
C
/*
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* Copyright © 2014-2015 Broadcom
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#include "nir.h"
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#include "nir_builder.h"
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/** @file nir_lower_alu_to_scalar.c
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*
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* Replaces nir_alu_instr operations with more than one channel used in the
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* arguments with individual per-channel operations.
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*/
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static void
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nir_alu_ssa_dest_init(nir_alu_instr *instr, unsigned num_components,
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unsigned bit_size)
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{
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nir_ssa_dest_init(&instr->instr, &instr->dest.dest, num_components,
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bit_size, NULL);
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instr->dest.write_mask = (1 << num_components) - 1;
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}
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static void
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lower_reduction(nir_alu_instr *instr, nir_op chan_op, nir_op merge_op,
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nir_builder *builder)
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{
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unsigned num_components = nir_op_infos[instr->op].input_sizes[0];
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nir_ssa_def *last = NULL;
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for (unsigned i = 0; i < num_components; i++) {
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nir_alu_instr *chan = nir_alu_instr_create(builder->shader, chan_op);
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nir_alu_ssa_dest_init(chan, 1, instr->dest.dest.ssa.bit_size);
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nir_alu_src_copy(&chan->src[0], &instr->src[0], chan);
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chan->src[0].swizzle[0] = chan->src[0].swizzle[i];
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if (nir_op_infos[chan_op].num_inputs > 1) {
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assert(nir_op_infos[chan_op].num_inputs == 2);
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nir_alu_src_copy(&chan->src[1], &instr->src[1], chan);
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chan->src[1].swizzle[0] = chan->src[1].swizzle[i];
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}
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chan->exact = instr->exact;
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nir_builder_instr_insert(builder, &chan->instr);
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if (i == 0) {
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last = &chan->dest.dest.ssa;
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} else {
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last = nir_build_alu(builder, merge_op,
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last, &chan->dest.dest.ssa, NULL, NULL);
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}
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}
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assert(instr->dest.write_mask == 1);
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nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(last));
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nir_instr_remove(&instr->instr);
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}
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static bool
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lower_alu_instr_scalar(nir_alu_instr *instr, nir_builder *b)
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{
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unsigned num_src = nir_op_infos[instr->op].num_inputs;
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unsigned i, chan;
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assert(instr->dest.dest.is_ssa);
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assert(instr->dest.write_mask != 0);
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b->cursor = nir_before_instr(&instr->instr);
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b->exact = instr->exact;
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#define LOWER_REDUCTION(name, chan, merge) \
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case name##2: \
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case name##3: \
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case name##4: \
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lower_reduction(instr, chan, merge, b); \
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return true;
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switch (instr->op) {
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case nir_op_vec4:
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case nir_op_vec3:
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case nir_op_vec2:
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/* We don't need to scalarize these ops, they're the ones generated to
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* group up outputs into a value that can be SSAed.
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*/
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return false;
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case nir_op_pack_half_2x16:
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if (!b->shader->options->lower_pack_half_2x16)
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return false;
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nir_ssa_def *val =
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nir_pack_half_2x16_split(b, nir_channel(b, instr->src[0].src.ssa,
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instr->src[0].swizzle[0]),
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nir_channel(b, instr->src[0].src.ssa,
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instr->src[0].swizzle[1]));
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nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val));
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nir_instr_remove(&instr->instr);
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return true;
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case nir_op_unpack_unorm_4x8:
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case nir_op_unpack_snorm_4x8:
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case nir_op_unpack_unorm_2x16:
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case nir_op_unpack_snorm_2x16:
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/* There is no scalar version of these ops, unless we were to break it
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* down to bitshifts and math (which is definitely not intended).
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*/
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return false;
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case nir_op_unpack_half_2x16: {
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if (!b->shader->options->lower_unpack_half_2x16)
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return false;
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nir_ssa_def *comps[2];
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comps[0] = nir_unpack_half_2x16_split_x(b, instr->src[0].src.ssa);
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comps[1] = nir_unpack_half_2x16_split_y(b, instr->src[0].src.ssa);
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nir_ssa_def *vec = nir_vec(b, comps, 2);
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nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(vec));
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nir_instr_remove(&instr->instr);
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return true;
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}
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case nir_op_pack_uvec2_to_uint: {
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assert(b->shader->options->lower_pack_snorm_2x16 ||
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b->shader->options->lower_pack_unorm_2x16);
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nir_ssa_def *word =
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nir_extract_u16(b, instr->src[0].src.ssa, nir_imm_int(b, 0));
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nir_ssa_def *val =
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nir_ior(b, nir_ishl(b, nir_channel(b, word, 1), nir_imm_int(b, 16)),
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nir_channel(b, word, 0));
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nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val));
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nir_instr_remove(&instr->instr);
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break;
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}
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case nir_op_pack_uvec4_to_uint: {
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assert(b->shader->options->lower_pack_snorm_4x8 ||
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b->shader->options->lower_pack_unorm_4x8);
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nir_ssa_def *byte =
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nir_extract_u8(b, instr->src[0].src.ssa, nir_imm_int(b, 0));
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nir_ssa_def *val =
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nir_ior(b, nir_ior(b, nir_ishl(b, nir_channel(b, byte, 3), nir_imm_int(b, 24)),
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nir_ishl(b, nir_channel(b, byte, 2), nir_imm_int(b, 16))),
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nir_ior(b, nir_ishl(b, nir_channel(b, byte, 1), nir_imm_int(b, 8)),
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nir_channel(b, byte, 0)));
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nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val));
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nir_instr_remove(&instr->instr);
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break;
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}
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case nir_op_fdph: {
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nir_ssa_def *sum[4];
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for (unsigned i = 0; i < 3; i++) {
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sum[i] = nir_fmul(b, nir_channel(b, instr->src[0].src.ssa,
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instr->src[0].swizzle[i]),
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nir_channel(b, instr->src[1].src.ssa,
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instr->src[1].swizzle[i]));
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}
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sum[3] = nir_channel(b, instr->src[1].src.ssa, instr->src[1].swizzle[3]);
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nir_ssa_def *val = nir_fadd(b, nir_fadd(b, sum[0], sum[1]),
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nir_fadd(b, sum[2], sum[3]));
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nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(val));
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nir_instr_remove(&instr->instr);
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return true;
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}
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case nir_op_unpack_64_2x32:
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return false;
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LOWER_REDUCTION(nir_op_fdot, nir_op_fmul, nir_op_fadd);
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LOWER_REDUCTION(nir_op_ball_fequal, nir_op_feq, nir_op_iand);
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LOWER_REDUCTION(nir_op_ball_iequal, nir_op_ieq, nir_op_iand);
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LOWER_REDUCTION(nir_op_bany_fnequal, nir_op_fne, nir_op_ior);
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LOWER_REDUCTION(nir_op_bany_inequal, nir_op_ine, nir_op_ior);
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LOWER_REDUCTION(nir_op_fall_equal, nir_op_seq, nir_op_fand);
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LOWER_REDUCTION(nir_op_fany_nequal, nir_op_sne, nir_op_for);
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default:
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break;
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}
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if (instr->dest.dest.ssa.num_components == 1)
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return false;
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unsigned num_components = instr->dest.dest.ssa.num_components;
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nir_ssa_def *comps[] = { NULL, NULL, NULL, NULL };
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for (chan = 0; chan < 4; chan++) {
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if (!(instr->dest.write_mask & (1 << chan)))
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continue;
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nir_alu_instr *lower = nir_alu_instr_create(b->shader, instr->op);
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for (i = 0; i < num_src; i++) {
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/* We only handle same-size-as-dest (input_sizes[] == 0) or scalar
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* args (input_sizes[] == 1).
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*/
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assert(nir_op_infos[instr->op].input_sizes[i] < 2);
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unsigned src_chan = (nir_op_infos[instr->op].input_sizes[i] == 1 ?
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0 : chan);
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nir_alu_src_copy(&lower->src[i], &instr->src[i], lower);
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for (int j = 0; j < 4; j++)
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lower->src[i].swizzle[j] = instr->src[i].swizzle[src_chan];
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}
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nir_alu_ssa_dest_init(lower, 1, instr->dest.dest.ssa.bit_size);
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lower->dest.saturate = instr->dest.saturate;
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comps[chan] = &lower->dest.dest.ssa;
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lower->exact = instr->exact;
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nir_builder_instr_insert(b, &lower->instr);
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}
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nir_ssa_def *vec = nir_vec(b, comps, num_components);
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nir_ssa_def_rewrite_uses(&instr->dest.dest.ssa, nir_src_for_ssa(vec));
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nir_instr_remove(&instr->instr);
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return true;
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}
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static bool
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nir_lower_alu_to_scalar_impl(nir_function_impl *impl)
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{
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nir_builder builder;
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nir_builder_init(&builder, impl);
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bool progress = false;
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nir_foreach_block(block, impl) {
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nir_foreach_instr_safe(instr, block) {
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if (instr->type == nir_instr_type_alu) {
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progress = lower_alu_instr_scalar(nir_instr_as_alu(instr),
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&builder) || progress;
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}
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}
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}
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nir_metadata_preserve(impl, nir_metadata_block_index |
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nir_metadata_dominance);
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return progress;
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}
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bool
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nir_lower_alu_to_scalar(nir_shader *shader)
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{
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bool progress = false;
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nir_foreach_function(function, shader) {
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if (function->impl)
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progress = nir_lower_alu_to_scalar_impl(function->impl) || progress;
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}
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return progress;
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}
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