src/gallium/drivers/lima/ir/lima_nir_lower_uniform_to_scalar.c

   1 /*
   2  * Copyright (c) 2019 Qiang Yu <yuq825@gmail.com>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sub license,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the
  12  * next paragraph) shall be included in all copies or substantial portions
  13  * of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include "nir.h"
  26 #include "nir_builder.h"
  27 #include "lima_ir.h"
  28
  29 static void
  30 lower_load_uniform_to_scalar(nir_builder *b, nir_intrinsic_instr *intr)
  31 {
  32    b->cursor = nir_before_instr(&intr->instr);
  33
  34    nir_ssa_def *loads[4];
  35    for (unsigned i = 0; i < intr->num_components; i++) {
  36       nir_intrinsic_instr *chan_intr =
  37          nir_intrinsic_instr_create(b->shader, intr->intrinsic);
  38       nir_ssa_dest_init(&chan_intr->instr, &chan_intr->dest,
  39                         1, intr->dest.ssa.bit_size, NULL);
  40       chan_intr->num_components = 1;
  41
  42       nir_intrinsic_set_base(chan_intr, nir_intrinsic_base(intr) * 4 + i);
  43       nir_intrinsic_set_range(chan_intr, nir_intrinsic_range(intr) * 4);
  44
  45       chan_intr->src[0] =
  46          nir_src_for_ssa(nir_fmul_imm(b, intr->src[0].ssa, 4));
  47
  48       nir_builder_instr_insert(b, &chan_intr->instr);
  49
  50       loads[i] = &chan_intr->dest.ssa;
  51    }
  52
  53    nir_ssa_def_rewrite_uses(&intr->dest.ssa,
  54                             nir_src_for_ssa(nir_vec(b, loads,
  55                                                     intr->num_components)));
  56    nir_instr_remove(&intr->instr);
  57 }
  58
  59 void
  60 lima_nir_lower_uniform_to_scalar(nir_shader *shader)
  61 {
  62    nir_foreach_function(function, shader) {
  63       if (function->impl) {
  64          nir_builder b;
  65          nir_builder_init(&b, function->impl);
  66
  67          nir_foreach_block(block, function->impl) {
  68             nir_foreach_instr_safe(instr, block) {
  69                if (instr->type != nir_instr_type_intrinsic)
  70                   continue;
  71
  72                nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
  73
  74                if (intr->intrinsic != nir_intrinsic_load_uniform ||
  75                    intr->num_components == 1)
  76                   continue;
  77
  78                lower_load_uniform_to_scalar(&b, intr);
  79             }
  80          }
  81       }
  82    }
  83 }