5f0ef6a5a9
Interpreting data of one type via a pointer of a different type is an aliasing violating. This means that a compiler optimizer's analyzer can assume that data loaded into an array as uint32_t isn't related to data read out from the same array as uint64_t, and e.g. reorder loads/stores. Since these structs are intentionally used to load data via pointers of a wrong size, tell the compiler that these accesses may alias other reads. This fixes the GetIntraPredictorTest tests of WelsI4x4LumaPredV_c and WelsI4x4LumaPredH_c. (The compiler optimizer did the wrong thing as long as WelsFillingPred8to16_c or WelsFillingPred8x2to16_c were inlined into the calling function.)
131 lines
4.1 KiB
C
131 lines
4.1 KiB
C
/*!
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* \copy
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* Copyright (c) 2013, Cisco Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#ifndef ___LD_ST_MACROS___
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#define ___LD_ST_MACROS___
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#include <string.h>
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#include "typedefs.h"
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#ifdef __GNUC__
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struct tagUnaligned_64 {
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uint64_t l;
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} __attribute__ ((packed)) __attribute__ ((may_alias));
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struct tagUnaligned_32 {
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uint32_t l;
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} __attribute__ ((packed)) __attribute__ ((may_alias));
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struct tagUnaligned_16 {
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uint16_t l;
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} __attribute__ ((packed)) __attribute__ ((may_alias));
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#define LD16(a) (((struct tagUnaligned_16 *) (a))->l)
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#define LD32(a) (((struct tagUnaligned_32 *) (a))->l)
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#define LD64(a) (((struct tagUnaligned_64 *) (a))->l)
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#define STRUCTA(size, align) struct tagUnaligned_##size##_##align {\
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uint##size##_t l; \
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} __attribute__ ((aligned(align))) __attribute__ ((may_alias))
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STRUCTA (16, 2);
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STRUCTA (32, 2);
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STRUCTA (32, 4);
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STRUCTA (64, 2);
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STRUCTA (64, 4);
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STRUCTA (64, 8);
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//#define _USE_STRUCT_INT_CVT
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// #ifdef _USE_STRUCT_INT_CVT
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#define ST16(a, b) (((struct tagUnaligned_16 *) (a))->l) = (b)
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#define ST32(a, b) (((struct tagUnaligned_32 *) (a))->l) = (b)
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#define ST64(a, b) (((struct tagUnaligned_64 *) (a))->l) = (b)
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#define LDA(a, size, align) (((struct tagUnaligned_##size##_##align *) (a))->l)
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#define STA(a, b, size, align) (((struct tagUnaligned_##size##_##align *) (a))->l) = (b)
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#define LD16A2(a) LDA(a, 16, 2)
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#define LD32A2(a) LDA(a, 32, 2)
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#define LD32A4(a) LDA(a, 32, 4)
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#define LD64A2(a) LDA(a, 64, 2)
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#define LD64A4(a) LDA(a, 64, 4)
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#define LD64A8(a) LDA(a, 64, 8)
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#define ST16A2(a, b) STA(a, b, 16, 2)
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#define ST32A2(a, b) STA(a, b, 32, 2)
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#define ST32A4(a, b) STA(a, b, 32, 4)
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#define ST64A2(a, b) STA(a, b, 64, 2)
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#define ST64A4(a, b) STA(a, b, 64, 4)
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#define ST64A8(a, b) STA(a, b, 64, 8)
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// #else
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// inline void __ST16(void *dst, uint16_t v) { memcpy(dst, &v, 2); }
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// inline void __ST32(void *dst, uint32_t v) { memcpy(dst, &v, 4); }
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//inline void __ST64(void *dst, uint64_t v) { memcpy(dst, &v, 8); }
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// #endif
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#else
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//#define INTD16(a) (*((int16_t*)(a)))
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//#define INTD32(a) (*((int32_t*)(a)))
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//#define INTD64(a) (*((int64_t*)(a)))
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#define LD16(a) (*((uint16_t*)(a)))
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#define LD32(a) (*((uint32_t*)(a)))
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#define LD64(a) (*((uint64_t*)(a)))
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#define ST16(a, b) *((uint16_t*)(a)) = (b)
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#define ST32(a, b) *((uint32_t*)(a)) = (b)
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#define ST64(a, b) *((uint64_t*)(a)) = (b)
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#define LD16A2 LD16
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#define LD32A2 LD32
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#define LD32A4 LD32
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#define LD64A2 LD64
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#define LD64A4 LD64
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#define LD64A8 LD64
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#define ST16A2 ST16
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#define ST32A2 ST32
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#define ST32A4 ST32
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#define ST64A2 ST64
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#define ST64A4 ST64
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#define ST64A8 ST64
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#endif /* !__GNUC__ */
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#ifndef INTD16
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#define INTD16 LD16
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#endif//INTD16
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#ifndef INTD32
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#define INTD32 LD32
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#endif//INTD32
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#ifndef INTD64
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#define INTD64 LD64
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#endif//INTD64
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#endif//___LD_ST_MACROS___
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