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/*
* Copyright © 2014 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Jason Ekstrand (jason@jlekstrand.net)
*
*/
#ifndef _NIR_SEARCH_
#define _NIR_SEARCH_
#include "nir.h"
#define NIR_SEARCH_MAX_VARIABLES 16
struct nir_builder;
typedef enum {
nir_search_value_expression,
nir_search_value_variable,
nir_search_value_constant,
} nir_search_value_type;
typedef struct {
nir_search_value_type type;
/**
* Bit size of the value. It is interpreted as follows:
*
* For a search expression:
* - If bit_size > 0, then the value only matches an SSA value with the
* given bit size.
* - If bit_size <= 0, then the value matches any size SSA value.
*
* For a replace expression:
* - If bit_size > 0, then the value is constructed with the given bit size.
* - If bit_size == 0, then the value is constructed with the same bit size
* as the search value.
* - If bit_size < 0, then the value is constructed with the same bit size
* as variable (-bit_size - 1).
*/
int bit_size;
} nir_search_value;
typedef struct {
nir_search_value value;
/** The variable index; Must be less than NIR_SEARCH_MAX_VARIABLES */
unsigned variable;
/** Indicates that the given variable must be a constant
*
* This is only allowed in search expressions and indicates that the
* given variable is only allowed to match constant values.
*/
bool is_constant;
/** Indicates that the given variable must have a certain type
*
* This is only allowed in search expressions and indicates that the
* given variable is only allowed to match values that come from an ALU
* instruction with the given output type. A type of nir_type_void
* means it can match any type.
*
* Note: A variable that is both constant and has a non-void type will
* never match anything.
*/
nir_alu_type type;
/** Optional condition fxn ptr
*
* This is only allowed in search expressions, and allows additional
* constraints to be placed on the match. Typically used for 'is_constant'
* variables to require, for example, power-of-two in order for the search
* to match.
*/
bool (*cond)(nir_alu_instr *instr, unsigned src,
unsigned num_components, const uint8_t *swizzle);
} nir_search_variable;
typedef struct {
nir_search_value value;
nir_alu_type type;
union {
uint64_t u;
int64_t i;
double d;
} data;
} nir_search_constant;
enum nir_search_op {
nir_search_op_i2f = nir_last_opcode + 1,
nir_search_op_u2f,
nir_search_op_f2f,
nir_search_op_f2u,
nir_search_op_f2i,
nir_search_op_u2u,
nir_search_op_i2i,
nir_search_op_b2f,
nir_search_op_b2i,
nir_search_op_i2b,
nir_search_op_f2b,
};
typedef struct {
nir_search_value value;
/* When set on a search expression, the expression will only match an SSA
* value that does *not* have the exact bit set. If unset, the exact bit
* on the SSA value is ignored.
*/
bool inexact;
/* Commutative expression index. This is assigned by opt_algebraic.py when
* search structures are constructed and is a unique (to this structure)
* index within the commutative operation bitfield used for searching for
* all combinations of expressions containing commutative operations.
*/
int8_t comm_expr_idx;
/* Number of commutative expressions in this expression including this one
* (if it is commutative).
*/
uint8_t comm_exprs;
/* One of nir_op or nir_search_op */
uint16_t opcode;
const nir_search_value *srcs[4];
/** Optional condition fxn ptr
*
* This allows additional constraints on expression matching, it is
* typically used to match an expressions uses such as the number of times
* the expression is used, and whether its used by an if.
*/
bool (*cond)(nir_alu_instr *instr);
} nir_search_expression;
NIR_DEFINE_CAST(nir_search_value_as_variable, nir_search_value,
nir_search_variable, value,
type, nir_search_value_variable)
NIR_DEFINE_CAST(nir_search_value_as_constant, nir_search_value,
nir_search_constant, value,
type, nir_search_value_constant)
NIR_DEFINE_CAST(nir_search_value_as_expression, nir_search_value,
nir_search_expression, value,
type, nir_search_value_expression)
nir_ssa_def *
nir_replace_instr(struct nir_builder *b, nir_alu_instr *instr,
const nir_search_expression *search,
const nir_search_value *replace);
#endif /* _NIR_SEARCH_ */
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