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/*
* Copyright © 2018 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.
*/
#ifndef NIR_DEREF_H
#define NIR_DEREF_H
#include "nir.h"
#include "nir_builder.h"
#ifdef __cplusplus
extern "C" {
#endif
typedef struct {
/** Short path so we can keep it on the stack most of the time. */
nir_deref_instr *_short_path[7];
/** A null-terminated array view of a deref chain
*
* The first element of this array will be the variable dereference
* followed by every deref_instr on the path to the final one. The last
* element in the array is a NULL pointer which acts as a terminator.
*/
nir_deref_instr **path;
} nir_deref_path;
void nir_deref_path_init(nir_deref_path *path,
nir_deref_instr *deref, void *mem_ctx);
void nir_deref_path_finish(nir_deref_path *path);
unsigned nir_deref_instr_get_const_offset(nir_deref_instr *deref,
glsl_type_size_align_func size_align);
nir_ssa_def *nir_build_deref_offset(nir_builder *b, nir_deref_instr *deref,
glsl_type_size_align_func size_align);
typedef enum {
nir_derefs_do_not_alias = 0,
nir_derefs_equal_bit = (1 << 0),
nir_derefs_may_alias_bit = (1 << 1),
nir_derefs_a_contains_b_bit = (1 << 2),
nir_derefs_b_contains_a_bit = (1 << 3),
} nir_deref_compare_result;
nir_deref_compare_result nir_compare_deref_paths(nir_deref_path *a_path, nir_deref_path *b_path);
nir_deref_compare_result nir_compare_derefs(nir_deref_instr *a, nir_deref_instr *b);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* NIR_DEREF_H */
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