src/compiler/nir/nir_worklist.c

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Jason Ekstrand (jason@jlekstrand.net)
  25  *
  26  */
  27
  28 #include "nir_worklist.h"
  29
  30 void
  31 nir_block_worklist_init(nir_block_worklist *w, unsigned num_blocks,
  32                         void *mem_ctx)
  33 {
  34    w->size = num_blocks;
  35    w->count = 0;
  36    w->start = 0;
  37
  38    w->blocks_present = rzalloc_array(mem_ctx, BITSET_WORD,
  39                                      BITSET_WORDS(num_blocks));
  40    w->blocks = rzalloc_array(mem_ctx, nir_block *, num_blocks);
  41 }
  42
  43 void
  44 nir_block_worklist_fini(nir_block_worklist *w)
  45 {
  46    ralloc_free(w->blocks_present);
  47    ralloc_free(w->blocks);
  48 }
  49
  50 void
  51 nir_block_worklist_add_all(nir_block_worklist *w, nir_function_impl *impl)
  52 {
  53    nir_foreach_block(block, impl) {
  54       nir_block_worklist_push_tail(w, block);
  55    }
  56 }
  57
  58 void
  59 nir_block_worklist_push_head(nir_block_worklist *w, nir_block *block)
  60 {
  61    /* Pushing a block we already have is a no-op */
  62    if (BITSET_TEST(w->blocks_present, block->index))
  63       return;
  64
  65    assert(w->count < w->size);
  66
  67    if (w->start == 0)
  68       w->start = w->size - 1;
  69    else
  70       w->start--;
  71
  72    w->count++;
  73
  74    w->blocks[w->start] = block;
  75    BITSET_SET(w->blocks_present, block->index);
  76 }
  77
  78 nir_block *
  79 nir_block_worklist_peek_head(const nir_block_worklist *w)
  80 {
  81    assert(w->count > 0);
  82
  83    return w->blocks[w->start];
  84 }
  85
  86 nir_block *
  87 nir_block_worklist_pop_head(nir_block_worklist *w)
  88 {
  89    assert(w->count > 0);
  90
  91    unsigned head = w->start;
  92
  93    w->start = (w->start + 1) % w->size;
  94    w->count--;
  95
  96    BITSET_CLEAR(w->blocks_present, w->blocks[head]->index);
  97    return w->blocks[head];
  98 }
  99
 100 void
 101 nir_block_worklist_push_tail(nir_block_worklist *w, nir_block *block)
 102 {
 103    /* Pushing a block we already have is a no-op */
 104    if (BITSET_TEST(w->blocks_present, block->index))
 105       return;
 106
 107    assert(w->count < w->size);
 108
 109    w->count++;
 110
 111    unsigned tail = (w->start + w->count - 1) % w->size;
 112
 113    w->blocks[tail] = block;
 114    BITSET_SET(w->blocks_present, block->index);
 115 }
 116
 117 nir_block *
 118 nir_block_worklist_peek_tail(const nir_block_worklist *w)
 119 {
 120    assert(w->count > 0);
 121
 122    unsigned tail = (w->start + w->count - 1) % w->size;
 123
 124    return w->blocks[tail];
 125 }
 126
 127 nir_block *
 128 nir_block_worklist_pop_tail(nir_block_worklist *w)
 129 {
 130    assert(w->count > 0);
 131
 132    unsigned tail = (w->start + w->count - 1) % w->size;
 133
 134    w->count--;
 135
 136    BITSET_CLEAR(w->blocks_present, w->blocks[tail]->index);
 137    return w->blocks[tail];
 138 }