ctx.h (3534B)
1 /* 2 * Copyright © 2018, VideoLAN and dav1d authors 3 * Copyright © 2018, Two Orioles, LLC 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright notice, this 10 * list of conditions and the following disclaimer. 11 * 12 * 2. Redistributions in binary form must reproduce the above copyright notice, 13 * this list of conditions and the following disclaimer in the documentation 14 * and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #ifndef DAV1D_SRC_CTX_H 29 #define DAV1D_SRC_CTX_H 30 31 #include <stdint.h> 32 33 #include "common/attributes.h" 34 #include "common/intops.h" 35 36 union alias64 { uint64_t u64; uint8_t u8[8]; } ATTR_ALIAS; 37 union alias32 { uint32_t u32; uint8_t u8[4]; } ATTR_ALIAS; 38 union alias16 { uint16_t u16; uint8_t u8[2]; } ATTR_ALIAS; 39 union alias8 { uint8_t u8; } ATTR_ALIAS; 40 41 typedef void (*dav1d_memset_pow2_fn)(void *ptr, int value); 42 EXTERN const dav1d_memset_pow2_fn dav1d_memset_pow2[6]; 43 44 static inline void dav1d_memset_likely_pow2(void *const ptr, const int value, const int n) { 45 assert(n >= 1 && n <= 32); 46 if ((n&(n-1)) == 0) { 47 dav1d_memset_pow2[ulog2(n)](ptr, value); 48 } else { 49 memset(ptr, value, n); 50 } 51 } 52 53 // For smaller sizes use multiplication to broadcast bytes. memset misbehaves on the smaller sizes. 54 // For the larger sizes, we want to use memset to get access to vector operations. 55 #define set_ctx1(var, off, val) \ 56 ((union alias8 *) &(var)[off])->u8 = (val) * 0x01 57 #define set_ctx2(var, off, val) \ 58 ((union alias16 *) &(var)[off])->u16 = (val) * 0x0101 59 #define set_ctx4(var, off, val) \ 60 ((union alias32 *) &(var)[off])->u32 = (val) * 0x01010101U 61 #define set_ctx8(var, off, val) \ 62 ((union alias64 *) &(var)[off])->u64 = (val) * 0x0101010101010101ULL 63 #define set_ctx16(var, off, val) do { \ 64 memset(&(var)[off], val, 16); \ 65 } while (0) 66 #define set_ctx32(var, off, val) do { \ 67 memset(&(var)[off], val, 32); \ 68 } while (0) 69 #define case_set(var) \ 70 switch (var) { \ 71 case 0: set_ctx(set_ctx1); break; \ 72 case 1: set_ctx(set_ctx2); break; \ 73 case 2: set_ctx(set_ctx4); break; \ 74 case 3: set_ctx(set_ctx8); break; \ 75 case 4: set_ctx(set_ctx16); break; \ 76 case 5: set_ctx(set_ctx32); break; \ 77 default: assert(0); \ 78 } 79 #define case_set_upto16(var) \ 80 switch (var) { \ 81 case 0: set_ctx(set_ctx1); break; \ 82 case 1: set_ctx(set_ctx2); break; \ 83 case 2: set_ctx(set_ctx4); break; \ 84 case 3: set_ctx(set_ctx8); break; \ 85 case 4: set_ctx(set_ctx16); break; \ 86 default: assert(0); \ 87 } 88 89 #endif /* DAV1D_SRC_CTX_H */