src/panfrost/midgard/nir_fuse_io_16.c

   1 /*
   2  * Copyright (C) 2020 Collabora, Ltd.
   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, sublicense,
   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 next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * 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 NONINFRINGEMENT.  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 DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors (Collabora):
  24  *   Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
  25  */
  26
  27 /* Fuses f2f16 modifiers into loads */
  28
  29 #include "compiler/nir/nir.h"
  30 #include "compiler/nir/nir_builder.h"
  31 #include "panfrost/util/pan_ir.h"
  32
  33 bool nir_fuse_io_16(nir_shader *shader);
  34
  35 static bool
  36 nir_src_is_f2fmp(nir_src *use)
  37 {
  38    nir_instr *parent = use->parent_instr;
  39
  40    if (parent->type != nir_instr_type_alu)
  41       return false;
  42
  43    nir_alu_instr *alu = nir_instr_as_alu(parent);
  44    return (alu->op == nir_op_f2fmp);
  45 }
  46
  47 bool
  48 nir_fuse_io_16(nir_shader *shader)
  49 {
  50    bool progress = false;
  51
  52    nir_foreach_function(function, shader) {
  53       if (!function->impl) continue;
  54
  55       nir_builder b;
  56       nir_builder_init(&b, function->impl);
  57
  58       nir_foreach_block(block, function->impl) {
  59          nir_foreach_instr_safe(instr, block) {
  60             if (instr->type != nir_instr_type_intrinsic) continue;
  61
  62             nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
  63
  64             if (intr->intrinsic != nir_intrinsic_load_interpolated_input)
  65                     continue;
  66
  67             if (nir_dest_bit_size(intr->dest) != 32)
  68                     continue;
  69
  70             /* We swizzle at a 32-bit level so need a multiple of 2. We could
  71              * do a bit better and handle even components though */
  72             if (nir_intrinsic_component(intr))
  73                continue;
  74
  75             if (!intr->dest.is_ssa)
  76                continue;
  77
  78             if (!list_is_empty(&intr->dest.ssa.if_uses))
  79                return false;
  80
  81             bool valid = true;
  82
  83             nir_foreach_use(src, &intr->dest.ssa)
  84                valid &= nir_src_is_f2fmp(src);
  85
  86             if (!valid)
  87                continue;
  88
  89             intr->dest.ssa.bit_size = 16;
  90             progress |= true;
  91          }
  92       }
  93
  94       nir_metadata_preserve(function->impl, nir_metadata_block_index | nir_metadata_dominance);
  95
  96    }
  97
  98    return progress;
  99 }