| /* |
| * 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: |
| * Jason Ekstrand (jason@jlekstrand.net) |
| * |
| */ |
| |
| #include "nir_worklist.h" |
| |
| void |
| nir_block_worklist_init(nir_block_worklist *w, unsigned num_blocks, |
| void *mem_ctx) |
| { |
| w->size = num_blocks; |
| w->count = 0; |
| w->start = 0; |
| |
| w->blocks_present = rzalloc_array(mem_ctx, BITSET_WORD, |
| BITSET_WORDS(num_blocks)); |
| w->blocks = rzalloc_array(mem_ctx, nir_block *, num_blocks); |
| } |
| |
| void |
| nir_block_worklist_fini(nir_block_worklist *w) |
| { |
| ralloc_free(w->blocks_present); |
| ralloc_free(w->blocks); |
| } |
| |
| void |
| nir_block_worklist_add_all(nir_block_worklist *w, nir_function_impl *impl) |
| { |
| nir_foreach_block(block, impl) { |
| nir_block_worklist_push_tail(w, block); |
| } |
| } |
| |
| void |
| nir_block_worklist_push_head(nir_block_worklist *w, nir_block *block) |
| { |
| /* Pushing a block we already have is a no-op */ |
| if (BITSET_TEST(w->blocks_present, block->index)) |
| return; |
| |
| assert(w->count < w->size); |
| |
| if (w->start == 0) |
| w->start = w->size - 1; |
| else |
| w->start--; |
| |
| w->count++; |
| |
| w->blocks[w->start] = block; |
| BITSET_SET(w->blocks_present, block->index); |
| } |
| |
| nir_block * |
| nir_block_worklist_peek_head(const nir_block_worklist *w) |
| { |
| assert(w->count > 0); |
| |
| return w->blocks[w->start]; |
| } |
| |
| nir_block * |
| nir_block_worklist_pop_head(nir_block_worklist *w) |
| { |
| assert(w->count > 0); |
| |
| unsigned head = w->start; |
| |
| w->start = (w->start + 1) % w->size; |
| w->count--; |
| |
| BITSET_CLEAR(w->blocks_present, w->blocks[head]->index); |
| return w->blocks[head]; |
| } |
| |
| void |
| nir_block_worklist_push_tail(nir_block_worklist *w, nir_block *block) |
| { |
| /* Pushing a block we already have is a no-op */ |
| if (BITSET_TEST(w->blocks_present, block->index)) |
| return; |
| |
| assert(w->count < w->size); |
| |
| w->count++; |
| |
| unsigned tail = (w->start + w->count - 1) % w->size; |
| |
| w->blocks[tail] = block; |
| BITSET_SET(w->blocks_present, block->index); |
| } |
| |
| nir_block * |
| nir_block_worklist_peek_tail(const nir_block_worklist *w) |
| { |
| assert(w->count > 0); |
| |
| unsigned tail = (w->start + w->count - 1) % w->size; |
| |
| return w->blocks[tail]; |
| } |
| |
| nir_block * |
| nir_block_worklist_pop_tail(nir_block_worklist *w) |
| { |
| assert(w->count > 0); |
| |
| unsigned tail = (w->start + w->count - 1) % w->size; |
| |
| w->count--; |
| |
| BITSET_CLEAR(w->blocks_present, w->blocks[tail]->index); |
| return w->blocks[tail]; |
| } |