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  1. /*
  2.  * Copyright © 2014 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.  * Authors:
  24.  *    Jason Ekstrand (jason@jlekstrand.net)
  25.  *
  26.  */
  27.  
  28. #ifndef _NIR_SEARCH_
  29. #define _NIR_SEARCH_
  30.  
  31. #include "nir.h"
  32.  
  33. #define NIR_SEARCH_MAX_VARIABLES 16
  34.  
  35. typedef enum {
  36.    nir_search_value_expression,
  37.    nir_search_value_variable,
  38.    nir_search_value_constant,
  39. } nir_search_value_type;
  40.  
  41. typedef struct {
  42.    nir_search_value_type type;
  43. } nir_search_value;
  44.  
  45. typedef struct {
  46.    nir_search_value value;
  47.  
  48.    /** The variable index;  Must be less than NIR_SEARCH_MAX_VARIABLES */
  49.    unsigned variable;
  50.  
  51.    /** Indicates that the given variable must be a constant
  52.     *
  53.     * This is only alloed in search expressions and indicates that the
  54.     * given variable is only allowed to match constant values.
  55.     */
  56.    bool is_constant;
  57.  
  58.    /** Indicates that the given variable must have a certain type
  59.     *
  60.     * This is only allowed in search expressions and indicates that the
  61.     * given variable is only allowed to match values that come from an ALU
  62.     * instruction with the given output type.  A type of nir_type_void
  63.     * means it can match any type.
  64.     *
  65.     * Note: A variable that is both constant and has a non-void type will
  66.     * never match anything.
  67.     */
  68.    nir_alu_type type;
  69. } nir_search_variable;
  70.  
  71. typedef struct {
  72.    nir_search_value value;
  73.  
  74.    union {
  75.       uint32_t u;
  76.       int32_t i;
  77.       float f;
  78.    } data;
  79. } nir_search_constant;
  80.  
  81. typedef struct {
  82.    nir_search_value value;
  83.  
  84.    nir_op opcode;
  85.    const nir_search_value *srcs[4];
  86. } nir_search_expression;
  87.  
  88. NIR_DEFINE_CAST(nir_search_value_as_variable, nir_search_value,
  89.                 nir_search_variable, value)
  90. NIR_DEFINE_CAST(nir_search_value_as_constant, nir_search_value,
  91.                 nir_search_constant, value)
  92. NIR_DEFINE_CAST(nir_search_value_as_expression, nir_search_value,
  93.                 nir_search_expression, value)
  94.  
  95. nir_alu_instr *
  96. nir_replace_instr(nir_alu_instr *instr, const nir_search_expression *search,
  97.                   const nir_search_value *replace, void *mem_ctx);
  98.  
  99. #endif /* _NIR_SEARCH_ */
  100.