From: Jason Ekstrand Date: Fri, 19 Dec 2014 19:05:02 +0000 (-0800) Subject: nir: Add a worklist helper structure X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=4839d1aed167d904ebd5827d7c01d87ad5b0fca1;p=mesa.git nir: Add a worklist helper structure A worklist is a common concept in optimizations. This adds a structure that we can reuse for many different types of optimizations. Reviewed-by: Connor Abbott --- diff --git a/src/glsl/Makefile.sources b/src/glsl/Makefile.sources index 006e9472188..a951ca7dbc6 100644 --- a/src/glsl/Makefile.sources +++ b/src/glsl/Makefile.sources @@ -50,6 +50,8 @@ NIR_FILES = \ $(GLSL_SRCDIR)/nir/nir_split_var_copies.c \ $(GLSL_SRCDIR)/nir/nir_to_ssa.c \ $(GLSL_SRCDIR)/nir/nir_validate.c \ + $(GLSL_SRCDIR)/nir/nir_worklist.c \ + $(GLSL_SRCDIR)/nir/nir_worklist.h \ $(GLSL_SRCDIR)/nir/nir_types.cpp \ $(GLSL_SRCDIR)/nir/glsl_to_nir.cpp \ $(NIR_GENERATED_FILES) diff --git a/src/glsl/nir/nir_worklist.c b/src/glsl/nir/nir_worklist.c new file mode 100644 index 00000000000..a8baae9375e --- /dev/null +++ b/src/glsl/nir/nir_worklist.c @@ -0,0 +1,144 @@ +/* + * 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 = ralloc_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); +} + +static bool +worklist_add_block(nir_block *block, void *w) +{ + nir_block_worklist_push_tail(w, block); + + return true; +} + +void +nir_block_worklist_add_all(nir_block_worklist *w, nir_function_impl *impl) +{ + nir_foreach_block(impl, worklist_add_block, w); +} + +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(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->start + w->count - 1) % w->size; + + w->blocks[tail] = block; + BITSET_SET(w->blocks_present, block->index); +} + +nir_block * +nir_block_worklist_peek_tail(nir_block_worklist *w) +{ + assert(w->count > 0); + + unsigned tail = w->start = (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->start + w->count - 1) % w->size; + + w->count--; + + BITSET_CLEAR(w->blocks_present, w->blocks[tail]->index); + return w->blocks[tail]; +} diff --git a/src/glsl/nir/nir_worklist.h b/src/glsl/nir/nir_worklist.h new file mode 100644 index 00000000000..d5a8568e428 --- /dev/null +++ b/src/glsl/nir/nir_worklist.h @@ -0,0 +1,91 @@ +/* + * 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) + * + */ + +#pragma once + +#ifndef _NIR_WORKLIST_ +#define _NIR_WORKLIST_ + +#include "nir.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/** Represents a double-ended queue of unique blocks + * + * The worklist datastructure guarantees that eacy block is in the queue at + * most once. Pushing a block onto either end of the queue is a no-op if + * the block is already in the queue. In order for this to work, the + * caller must ensure that the blocks are properly indexed. + */ +typedef struct { + /* The total size of the worklist */ + unsigned size; + + /* The number of blocks currently in the worklist */ + unsigned count; + + /* The offset in the array of blocks at which the list starts */ + unsigned start; + + /* A bitset of all of the blocks currently present in the worklist */ + BITSET_WORD *blocks_present; + + /* The actual worklist */ + nir_block **blocks; +} nir_block_worklist; + +void nir_block_worklist_init(nir_block_worklist *w, unsigned num_blocks, + void *mem_ctx); +void nir_block_worklist_fini(nir_block_worklist *w); + +void nir_block_worklist_add_all(nir_block_worklist *w, nir_function_impl *impl); + +static inline bool +nir_block_worklist_is_empty(const nir_block_worklist *w) +{ + return w->count == 0; +} + +void nir_block_worklist_push_head(nir_block_worklist *w, nir_block *block); + +nir_block *nir_block_worklist_peek_head(nir_block_worklist *w); + +nir_block *nir_block_worklist_pop_head(nir_block_worklist *w); + +void nir_block_worklist_push_tail(nir_block_worklist *w, nir_block *block); + +nir_block *nir_block_worklist_peek_tail(nir_block_worklist *w); + +nir_block *nir_block_worklist_pop_tail(nir_block_worklist *w); + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +#endif /* _NIR_WORKLIST_ */