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523a28d3fe
This will replace direct usage of nir_instrs_equal() in the CSE pass, which reduces an O(n^2) algorithm with an effectively O(n) one. It'll also be useful for implementing GVN on top of GCM. v2: - Add texture support. - Add more comments. - Rename instr_can_hash() to instr_can_rewrite() since it's really more about whether its uses can be rewritten, and it's implicitly used by nir_instrs_equal() as well. - Rename nir_instr_set_add() to nir_instr_set_add_or_rewrite() (Jason). - Make the HASH() macro less magical (Topi). - Rewrite the commit message. v3: - For sorting phi sources, use a VLA, store pointers to the sources, and compare the predecessor pointer directly (Jason). Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com> Signed-off-by: Connor Abbott <cwabbott0@gmail.com>
64 lines
2.5 KiB
C
64 lines
2.5 KiB
C
/*
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* Copyright © 2014 Connor Abbott
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#pragma once
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#include "nir.h"
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bool nir_instrs_equal(const nir_instr *instr1, const nir_instr *instr2);
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/**
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* This file defines functions for creating, destroying, and manipulating an
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* "instruction set," which is an abstraction for finding duplicate
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* instructions using a hash set. Note that the question of whether an
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* instruction is actually a duplicate (e.g. whether it has any side effects)
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* is handled transparently. The user can pass any instruction to
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* nir_instr_set_add_or_rewrite() and nir_instr_set_remove(), and if the
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* instruction isn't safe to rewrite or isn't supported, it's silently
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* removed.
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*/
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/*@{*/
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/** Creates an instruction set, using a given ralloc mem_ctx */
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struct set *nir_instr_set_create(void *mem_ctx);
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/** Destroys an instruction set. */
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void nir_instr_set_destroy(struct set *instr_set);
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/**
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* Adds an instruction to an instruction set if it doesn't exist, or if it
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* does already exist, rewrites all uses of it to point to the other
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* already-inserted instruction. Returns 'true' if the uses of the instruction
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* were rewritten.
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*/
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bool nir_instr_set_add_or_rewrite(struct set *instr_set, nir_instr *instr);
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/**
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* Removes an instruction from an instruction set, so that other instructions
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* won't be merged with it.
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*/
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void nir_instr_set_remove(struct set *instr_set, nir_instr *instr);
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/*@}*/
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