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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:
* Connor Abbott (cwabbott0@gmail.com)
*
*/
#include "nir.h"
#pragma once
#ifdef __cplusplus
extern "C" {
#endif
/** NIR Control Flow Modification
*
* This file contains various API's that make modifying control flow in NIR,
* while maintaining the invariants checked by the validator, much easier.
*/
/* Helper struct for representing a point to extract/insert. Helps reduce the
* combinatorial explosion of possible points to extract.
*/
typedef enum {
nir_cursor_before_block,
nir_cursor_after_block,
nir_cursor_before_instr,
nir_cursor_after_instr,
} nir_cursor_option;
typedef struct {
nir_cursor_option option;
union {
nir_block *block;
nir_instr *instr;
};
} nir_cursor;
static inline nir_cursor
nir_before_block(nir_block *block)
{
nir_cursor cursor;
cursor.option = nir_cursor_before_block;
cursor.block = block;
return cursor;
}
static inline nir_cursor
nir_after_block(nir_block *block)
{
nir_cursor cursor;
cursor.option = nir_cursor_after_block;
cursor.block = block;
return cursor;
}
static inline nir_cursor
nir_before_instr(nir_instr *instr)
{
nir_cursor cursor;
cursor.option = nir_cursor_before_instr;
cursor.instr = instr;
return cursor;
}
static inline nir_cursor
nir_after_instr(nir_instr *instr)
{
nir_cursor cursor;
cursor.option = nir_cursor_after_instr;
cursor.instr = instr;
return cursor;
}
static inline nir_cursor
nir_before_cf_node(nir_cf_node *node)
{
if (node->type == nir_cf_node_block)
return nir_before_block(nir_cf_node_as_block(node));
return nir_after_block(nir_cf_node_as_block(nir_cf_node_prev(node)));
}
static inline nir_cursor
nir_after_cf_node(nir_cf_node *node)
{
if (node->type == nir_cf_node_block)
return nir_after_block(nir_cf_node_as_block(node));
return nir_before_block(nir_cf_node_as_block(nir_cf_node_next(node)));
}
static inline nir_cursor
nir_before_cf_list(struct exec_list *cf_list)
{
nir_cf_node *first_node = exec_node_data(nir_cf_node,
exec_list_get_head(cf_list), node);
return nir_before_cf_node(first_node);
}
static inline nir_cursor
nir_after_cf_list(struct exec_list *cf_list)
{
nir_cf_node *last_node = exec_node_data(nir_cf_node,
exec_list_get_tail(cf_list), node);
return nir_after_cf_node(last_node);
}
/** Control flow insertion. */
/** puts a control flow node where the cursor is */
void nir_cf_node_insert(nir_cursor cursor, nir_cf_node *node);
/** puts a control flow node immediately after another control flow node */
static inline void
nir_cf_node_insert_after(nir_cf_node *node, nir_cf_node *after)
{
nir_cf_node_insert(nir_after_cf_node(node), after);
}
/** puts a control flow node immediately before another control flow node */
static inline void
nir_cf_node_insert_before(nir_cf_node *node, nir_cf_node *before)
{
nir_cf_node_insert(nir_before_cf_node(node), before);
}
/** puts a control flow node at the beginning of a list from an if, loop, or function */
static inline void
nir_cf_node_insert_begin(struct exec_list *list, nir_cf_node *node)
{
nir_cf_node_insert(nir_before_cf_list(list), node);
}
/** puts a control flow node at the end of a list from an if, loop, or function */
static inline void
nir_cf_node_insert_end(struct exec_list *list, nir_cf_node *node)
{
nir_cf_node_insert(nir_after_cf_list(list), node);
}
/** removes a control flow node, doing any cleanup necessary */
void nir_cf_node_remove(nir_cf_node *node);
#ifdef __cplusplus
}
#endif
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