2015-07-22 03:54:18 +01:00
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/*
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* Copyright © 2014 Intel Corporation
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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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* Authors:
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* Connor Abbott (cwabbott0@gmail.com)
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*
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*/
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#include "nir.h"
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#pragma once
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#ifdef __cplusplus
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extern "C" {
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#endif
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/** NIR Control Flow Modification
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*
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* This file contains various API's that make modifying control flow in NIR,
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* while maintaining the invariants checked by the validator, much easier.
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*/
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nir/cf: add a cursor structure
For now, it allows us to refactor the control flow insertion API's so
that there's a single entrypoint (with some wrappers). More importantly,
it will allow us to reduce the combinatorial explosion in the extract
function. There, we need to specify two points to extract, which may be
at the beginning of a block, the end of a block, or in the middle of a
block. And then there are various wrappers based off of that (before a
control flow node, before a control flow list, etc.). Rather than having
9 different functions, we can have one function and push the actual
logic of determining which variant to use down to the split function,
which will be shared with nir_cf_node_insert().
In the future, we may want to make the instruction insertion API's as
well as the builder use this, but that's a future cleanup.
Signed-off-by: Connor Abbott <connor.w.abbott@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
2015-07-22 03:54:30 +01:00
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/* Helper struct for representing a point to extract/insert. Helps reduce the
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* combinatorial explosion of possible points to extract.
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*/
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typedef enum {
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nir_cursor_before_block,
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nir_cursor_after_block,
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nir_cursor_before_instr,
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nir_cursor_after_instr,
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} nir_cursor_option;
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typedef struct {
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nir_cursor_option option;
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union {
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nir_block *block;
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nir_instr *instr;
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};
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} nir_cursor;
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static inline nir_cursor
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nir_before_block(nir_block *block)
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{
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nir_cursor cursor;
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cursor.option = nir_cursor_before_block;
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cursor.block = block;
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return cursor;
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}
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static inline nir_cursor
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nir_after_block(nir_block *block)
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{
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nir_cursor cursor;
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cursor.option = nir_cursor_after_block;
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cursor.block = block;
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return cursor;
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}
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static inline nir_cursor
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nir_before_instr(nir_instr *instr)
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{
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nir_cursor cursor;
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cursor.option = nir_cursor_before_instr;
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cursor.instr = instr;
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return cursor;
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}
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static inline nir_cursor
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nir_after_instr(nir_instr *instr)
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{
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nir_cursor cursor;
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cursor.option = nir_cursor_after_instr;
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cursor.instr = instr;
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return cursor;
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}
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static inline nir_cursor
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nir_before_cf_node(nir_cf_node *node)
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{
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if (node->type == nir_cf_node_block)
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return nir_before_block(nir_cf_node_as_block(node));
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return nir_after_block(nir_cf_node_as_block(nir_cf_node_prev(node)));
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}
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static inline nir_cursor
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nir_after_cf_node(nir_cf_node *node)
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{
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if (node->type == nir_cf_node_block)
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return nir_after_block(nir_cf_node_as_block(node));
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return nir_before_block(nir_cf_node_as_block(nir_cf_node_next(node)));
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}
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static inline nir_cursor
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nir_before_cf_list(struct exec_list *cf_list)
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{
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nir_cf_node *first_node = exec_node_data(nir_cf_node,
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exec_list_get_head(cf_list), node);
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return nir_before_cf_node(first_node);
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}
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static inline nir_cursor
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nir_after_cf_list(struct exec_list *cf_list)
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{
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nir_cf_node *last_node = exec_node_data(nir_cf_node,
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exec_list_get_tail(cf_list), node);
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return nir_after_cf_node(last_node);
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}
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/** Control flow insertion. */
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2015-07-22 03:54:18 +01:00
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/** puts a control flow node immediately after another control flow node */
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void nir_cf_node_insert_after(nir_cf_node *node, nir_cf_node *after);
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/** puts a control flow node immediately before another control flow node */
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void nir_cf_node_insert_before(nir_cf_node *node, nir_cf_node *before);
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/** puts a control flow node at the beginning of a list from an if, loop, or function */
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void nir_cf_node_insert_begin(struct exec_list *list, nir_cf_node *node);
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/** puts a control flow node at the end of a list from an if, loop, or function */
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void nir_cf_node_insert_end(struct exec_list *list, nir_cf_node *node);
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/** removes a control flow node, doing any cleanup necessary */
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void nir_cf_node_remove(nir_cf_node *node);
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#ifdef __cplusplus
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}
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#endif
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