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/*
* Copyright © 2014 Connor Abbott
*
* 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.
*/
#ifndef NIR_INSTR_SET_H
#define NIR_INSTR_SET_H
#include "nir.h"
/**
* This file defines functions for creating, destroying, and manipulating an
* "instruction set," which is an abstraction for finding duplicate
* instructions using a hash set. Note that the question of whether an
* instruction is actually a duplicate (e.g. whether it has any side effects)
* is handled transparently. The user can pass any instruction to
* nir_instr_set_add_or_rewrite() and nir_instr_set_remove(), and if the
* instruction isn't safe to rewrite or isn't supported, it's silently
* removed.
*/
/*@{*/
/** Creates an instruction set, using a given ralloc mem_ctx */
struct set *nir_instr_set_create(void *mem_ctx);
/** Destroys an instruction set. */
void nir_instr_set_destroy(struct set *instr_set);
/**
* Adds an instruction to an instruction set if it doesn't exist, or if it
* does already exist, rewrites all uses of it to point to the other
* already-inserted instruction. Returns 'true' if the uses of the instruction
* were rewritten.
*/
bool nir_instr_set_add_or_rewrite(struct set *instr_set, nir_instr *instr);
/**
* Removes an instruction from an instruction set, so that other instructions
* won't be merged with it.
*/
void nir_instr_set_remove(struct set *instr_set, nir_instr *instr);
/*@}*/
#endif /* NIR_INSTR_SET_H */
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