From 008f54f63af51638ce36e47ca971714953f142f8 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Fri, 14 Oct 2016 12:55:03 +1000 Subject: util: add vector util code. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This is ported from anv, both anv and radv can share this. Reviewed-by: Nicolai Hähnle Acked-by: Jason Ekstrand Signed-off-by: Dave Airlie --- src/util/Makefile.sources | 4 +- src/util/u_vector.c | 98 +++++++++++++++++++++++++++++++++++++++++++++++ src/util/u_vector.h | 92 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 193 insertions(+), 1 deletion(-) create mode 100644 src/util/u_vector.c create mode 100644 src/util/u_vector.h diff --git a/src/util/Makefile.sources b/src/util/Makefile.sources index 8b17bcf8143..b7b1e913c94 100644 --- a/src/util/Makefile.sources +++ b/src/util/Makefile.sources @@ -35,7 +35,9 @@ MESA_UTIL_FILES := \ strtod.h \ texcompress_rgtc_tmp.h \ u_atomic.h \ - u_endian.h + u_endian.h \ + u_vector.c \ + u_vector.h MESA_UTIL_GENERATED_FILES = \ format_srgb.c diff --git a/src/util/u_vector.c b/src/util/u_vector.c new file mode 100644 index 00000000000..37c4245ebe4 --- /dev/null +++ b/src/util/u_vector.c @@ -0,0 +1,98 @@ +/* + * Copyright © 2015 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. + */ +#include "util/u_vector.h" + +int +u_vector_init(struct u_vector *vector, uint32_t element_size, uint32_t size) +{ + assert(util_is_power_of_two(size)); + assert(element_size < size && util_is_power_of_two(element_size)); + + vector->head = 0; + vector->tail = 0; + vector->element_size = element_size; + vector->size = size; + vector->data = malloc(size); + + return vector->data != NULL; +} + +void * +u_vector_add(struct u_vector *vector) +{ + uint32_t offset, size, split, src_tail, dst_tail; + void *data; + + if (vector->head - vector->tail == vector->size) { + size = vector->size * 2; + data = malloc(size); + if (data == NULL) + return NULL; + src_tail = vector->tail & (vector->size - 1); + dst_tail = vector->tail & (size - 1); + if (src_tail == 0) { + /* Since we know that the vector is full, this means that it's + * linear from start to end so we can do one copy. + */ + memcpy((char *)data + dst_tail, vector->data, vector->size); + } else { + /* In this case, the vector is split into two pieces and we have + * to do two copies. We have to be careful to make sure each + * piece goes to the right locations. Thanks to the change in + * size, it may or may not still wrap around. + */ + split = u_align_u32(vector->tail, vector->size); + assert(vector->tail <= split && split < vector->head); + memcpy((char *)data + dst_tail, (char *)vector->data + src_tail, + split - vector->tail); + memcpy((char *)data + (split & (size - 1)), vector->data, + vector->head - split); + } + free(vector->data); + vector->data = data; + vector->size = size; + } + + assert(vector->head - vector->tail < vector->size); + + offset = vector->head & (vector->size - 1); + vector->head += vector->element_size; + + return (char *)vector->data + offset; +} + +void * +u_vector_remove(struct u_vector *vector) +{ + uint32_t offset; + + if (vector->head == vector->tail) + return NULL; + + assert(vector->head - vector->tail <= vector->size); + + offset = vector->tail & (vector->size - 1); + vector->tail += vector->element_size; + + return (char *)vector->data + offset; +} diff --git a/src/util/u_vector.h b/src/util/u_vector.h new file mode 100644 index 00000000000..8fa4ec483c9 --- /dev/null +++ b/src/util/u_vector.h @@ -0,0 +1,92 @@ +/* + * Copyright © 2015 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. + */ + +/* + * u_vector is a vector based queue for storing arbitrary + * sized arrays of objects without using a linked list. + */ + +#ifndef U_VECTOR_H +#define U_VECTOR_H + +#include +#include +#include "util/u_math.h" +#include "util/macros.h" + +/* TODO - move to u_math.h - name it better etc */ +static inline uint32_t +u_align_u32(uint32_t v, uint32_t a) +{ + assert(a != 0 && a == (a & -a)); + return (v + a - 1) & ~(a - 1); +} + +struct u_vector { + uint32_t head; + uint32_t tail; + uint32_t element_size; + uint32_t size; + void *data; +}; + +int u_vector_init(struct u_vector *queue, uint32_t element_size, uint32_t size); +void *u_vector_add(struct u_vector *queue); +void *u_vector_remove(struct u_vector *queue); + +static inline int +u_vector_length(struct u_vector *queue) +{ + return (queue->head - queue->tail) / queue->element_size; +} + +static inline void * +u_vector_head(struct u_vector *vector) +{ + assert(vector->tail < vector->head); + return (void *)((char *)vector->data + + ((vector->head - vector->element_size) & + (vector->size - 1))); +} + +static inline void * +u_vector_tail(struct u_vector *vector) +{ + return (void *)((char *)vector->data + (vector->tail & (vector->size - 1))); +} + +static inline void +u_vector_finish(struct u_vector *queue) +{ + free(queue->data); +} + +#define u_vector_foreach(elem, queue) \ + static_assert(__builtin_types_compatible_p(__typeof__(queue), struct u_vector *), ""); \ + for (uint32_t __u_vector_offset = (queue)->tail; \ + elem = (queue)->data + (__u_vector_offset & ((queue)->size - 1)), __u_vector_offset < (queue)->head; \ + __u_vector_offset += (queue)->element_size) + + +#endif + -- cgit v1.2.3