src/compiler/nir/nir_search_helpers.h

   1 /*
   2  * Copyright © 2016 Red Hat
   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:
  24  *    Rob Clark <robclark@freedesktop.org>
  25  */
  26
  27 #ifndef _NIR_SEARCH_HELPERS_
  28 #define _NIR_SEARCH_HELPERS_
  29
  30 #include "nir.h"
  31 #include "util/bitscan.h"
  32
  33 static inline bool
  34 is_pos_power_of_two(nir_alu_instr *instr, unsigned src, unsigned num_components,
  35                     const uint8_t *swizzle)
  36 {
  37    nir_const_value *val = nir_src_as_const_value(instr->src[src].src);
  38
  39    /* only constant srcs: */
  40    if (!val)
  41       return false;
  42
  43    for (unsigned i = 0; i < num_components; i++) {
  44       switch (nir_op_infos[instr->op].input_types[src]) {
  45       case nir_type_int:
  46          if (val->i32[swizzle[i]] < 0)
  47             return false;
  48          if (!util_is_power_of_two_nonzero(val->i32[swizzle[i]]))
  49             return false;
  50          break;
  51       case nir_type_uint:
  52          if (!util_is_power_of_two_nonzero(val->u32[swizzle[i]]))
  53             return false;
  54          break;
  55       default:
  56          return false;
  57       }
  58    }
  59
  60    return true;
  61 }
  62
  63 static inline bool
  64 is_neg_power_of_two(nir_alu_instr *instr, unsigned src, unsigned num_components,
  65                     const uint8_t *swizzle)
  66 {
  67    nir_const_value *val = nir_src_as_const_value(instr->src[src].src);
  68
  69    /* only constant srcs: */
  70    if (!val)
  71       return false;
  72
  73    for (unsigned i = 0; i < num_components; i++) {
  74       switch (nir_op_infos[instr->op].input_types[src]) {
  75       case nir_type_int:
  76          if (val->i32[swizzle[i]] > 0)
  77             return false;
  78          if (!util_is_power_of_two_nonzero(abs(val->i32[swizzle[i]])))
  79             return false;
  80          break;
  81       default:
  82          return false;
  83       }
  84    }
  85
  86    return true;
  87 }
  88
  89 static inline bool
  90 is_zero_to_one(nir_alu_instr *instr, unsigned src, unsigned num_components,
  91                const uint8_t *swizzle)
  92 {
  93    nir_const_value *val = nir_src_as_const_value(instr->src[src].src);
  94
  95    if (!val)
  96       return false;
  97
  98    for (unsigned i = 0; i < num_components; i++) {
  99       switch (nir_op_infos[instr->op].input_types[src]) {
 100       case nir_type_float:
 101          if (val->f32[swizzle[i]] < 0.0f || val->f32[swizzle[i]] > 1.0f)
 102             return false;
 103          break;
 104       default:
 105          return false;
 106       }
 107    }
 108
 109    return true;
 110 }
 111
 112 static inline bool
 113 is_not_const(nir_alu_instr *instr, unsigned src, UNUSED unsigned num_components,
 114              UNUSED const uint8_t *swizzle)
 115 {
 116    nir_const_value *val = nir_src_as_const_value(instr->src[src].src);
 117
 118    if (val)
 119       return false;
 120
 121    return true;
 122 }
 123
 124 static inline bool
 125 is_used_more_than_once(nir_alu_instr *instr)
 126 {
 127    bool zero_if_use = list_empty(&instr->dest.dest.ssa.if_uses);
 128    bool zero_use = list_empty(&instr->dest.dest.ssa.uses);
 129
 130    if (zero_use && zero_if_use)
 131       return false;
 132    else if (zero_use && list_is_singular(&instr->dest.dest.ssa.if_uses))
 133       return false;
 134    else if (zero_if_use && list_is_singular(&instr->dest.dest.ssa.uses))
 135       return false;
 136
 137    return true;
 138 }
 139
 140 static inline bool
 141 is_used_once(nir_alu_instr *instr)
 142 {
 143    bool zero_if_use = list_empty(&instr->dest.dest.ssa.if_uses);
 144    bool zero_use = list_empty(&instr->dest.dest.ssa.uses);
 145
 146    if (zero_if_use && zero_use)
 147       return false;
 148
 149    if (!zero_if_use && list_is_singular(&instr->dest.dest.ssa.uses))
 150      return false;
 151
 152    if (!zero_use && list_is_singular(&instr->dest.dest.ssa.if_uses))
 153      return false;
 154
 155    if (!list_is_singular(&instr->dest.dest.ssa.if_uses) &&
 156        !list_is_singular(&instr->dest.dest.ssa.uses))
 157       return false;
 158
 159    return true;
 160 }
 161
 162 static inline bool
 163 is_not_used_by_if(nir_alu_instr *instr)
 164 {
 165    return list_empty(&instr->dest.dest.ssa.if_uses);
 166 }
 167
 168 #endif /* _NIR_SEARCH_ */