src/compiler/nir/nir_lower_bool_to_int32.c

   1 /*
   2  * Copyright © 2018 Intel Corporation
   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
  24 #include "nir.h"
  25
  26 static bool
  27 assert_ssa_def_is_not_1bit(nir_ssa_def *def, UNUSED void *unused)
  28 {
  29    assert(def->bit_size > 1);
  30    return true;
  31 }
  32
  33 static bool
  34 rewrite_1bit_ssa_def_to_32bit(nir_ssa_def *def, void *_progress)
  35 {
  36    bool *progress = _progress;
  37    if (def->bit_size == 1) {
  38       def->bit_size = 32;
  39       *progress = true;
  40    }
  41    return true;
  42 }
  43
  44 static bool
  45 lower_alu_instr(nir_alu_instr *alu)
  46 {
  47    const nir_op_info *op_info = &nir_op_infos[alu->op];
  48
  49    assert(alu->dest.dest.is_ssa);
  50
  51    switch (alu->op) {
  52    case nir_op_mov:
  53    case nir_op_vec2:
  54    case nir_op_vec3:
  55    case nir_op_vec4:
  56    case nir_op_vec8:
  57    case nir_op_vec16:
  58    case nir_op_inot:
  59    case nir_op_iand:
  60    case nir_op_ior:
  61    case nir_op_ixor:
  62       if (alu->dest.dest.ssa.bit_size != 1)
  63          return false;
  64       /* These we expect to have booleans but the opcode doesn't change */
  65       break;
  66
  67    case nir_op_f2b1: alu->op = nir_op_f2b32; break;
  68    case nir_op_i2b1: alu->op = nir_op_i2b32; break;
  69
  70    case nir_op_b2b32:
  71    case nir_op_b2b1:
  72       /* We're mutating instructions in a dominance-preserving order so our
  73        * source boolean should be 32-bit by now.
  74        */
  75       assert(nir_src_bit_size(alu->src[0].src) == 32);
  76       alu->op = nir_op_mov;
  77       break;
  78
  79    case nir_op_flt: alu->op = nir_op_flt32; break;
  80    case nir_op_fge: alu->op = nir_op_fge32; break;
  81    case nir_op_feq: alu->op = nir_op_feq32; break;
  82    case nir_op_fneu: alu->op = nir_op_fneu32; break;
  83    case nir_op_ilt: alu->op = nir_op_ilt32; break;
  84    case nir_op_ige: alu->op = nir_op_ige32; break;
  85    case nir_op_ieq: alu->op = nir_op_ieq32; break;
  86    case nir_op_ine: alu->op = nir_op_ine32; break;
  87    case nir_op_ult: alu->op = nir_op_ult32; break;
  88    case nir_op_uge: alu->op = nir_op_uge32; break;
  89
  90    case nir_op_ball_fequal2:  alu->op = nir_op_b32all_fequal2; break;
  91    case nir_op_ball_fequal3:  alu->op = nir_op_b32all_fequal3; break;
  92    case nir_op_ball_fequal4:  alu->op = nir_op_b32all_fequal4; break;
  93    case nir_op_bany_fnequal2: alu->op = nir_op_b32any_fnequal2; break;
  94    case nir_op_bany_fnequal3: alu->op = nir_op_b32any_fnequal3; break;
  95    case nir_op_bany_fnequal4: alu->op = nir_op_b32any_fnequal4; break;
  96    case nir_op_ball_iequal2:  alu->op = nir_op_b32all_iequal2; break;
  97    case nir_op_ball_iequal3:  alu->op = nir_op_b32all_iequal3; break;
  98    case nir_op_ball_iequal4:  alu->op = nir_op_b32all_iequal4; break;
  99    case nir_op_bany_inequal2: alu->op = nir_op_b32any_inequal2; break;
 100    case nir_op_bany_inequal3: alu->op = nir_op_b32any_inequal3; break;
 101    case nir_op_bany_inequal4: alu->op = nir_op_b32any_inequal4; break;
 102
 103    case nir_op_bcsel: alu->op = nir_op_b32csel; break;
 104
 105    default:
 106       assert(alu->dest.dest.ssa.bit_size > 1);
 107       for (unsigned i = 0; i < op_info->num_inputs; i++)
 108          assert(alu->src[i].src.ssa->bit_size > 1);
 109       return false;
 110    }
 111
 112    if (alu->dest.dest.ssa.bit_size == 1)
 113       alu->dest.dest.ssa.bit_size = 32;
 114
 115    return true;
 116 }
 117
 118 static bool
 119 nir_lower_bool_to_int32_impl(nir_function_impl *impl)
 120 {
 121    bool progress = false;
 122
 123    nir_foreach_block(block, impl) {
 124       nir_foreach_instr_safe(instr, block) {
 125          switch (instr->type) {
 126          case nir_instr_type_alu:
 127             progress |= lower_alu_instr(nir_instr_as_alu(instr));
 128             break;
 129
 130          case nir_instr_type_load_const: {
 131             nir_load_const_instr *load = nir_instr_as_load_const(instr);
 132             if (load->def.bit_size == 1) {
 133                nir_const_value *value = load->value;
 134                for (unsigned i = 0; i < load->def.num_components; i++)
 135                   load->value[i].u32 = value[i].b ? NIR_TRUE : NIR_FALSE;
 136                load->def.bit_size = 32;
 137                progress = true;
 138             }
 139             break;
 140          }
 141
 142          case nir_instr_type_intrinsic:
 143          case nir_instr_type_ssa_undef:
 144          case nir_instr_type_phi:
 145          case nir_instr_type_tex:
 146             nir_foreach_ssa_def(instr, rewrite_1bit_ssa_def_to_32bit,
 147                                 &progress);
 148             break;
 149
 150          default:
 151             nir_foreach_ssa_def(instr, assert_ssa_def_is_not_1bit, NULL);
 152          }
 153       }
 154    }
 155
 156    if (progress) {
 157       nir_metadata_preserve(impl, nir_metadata_block_index |
 158                                   nir_metadata_dominance);
 159    } else {
 160       nir_metadata_preserve(impl, nir_metadata_all);
 161    }
 162
 163    return progress;
 164 }
 165
 166 bool
 167 nir_lower_bool_to_int32(nir_shader *shader)
 168 {
 169    bool progress = false;
 170
 171    nir_foreach_function(function, shader) {
 172       if (function->impl && nir_lower_bool_to_int32_impl(function->impl))
 173          progress = true;
 174    }
 175
 176    return progress;
 177 }