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intreadwrite: Dont evaluate value for AV_W* multiple times.

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Evaluating it multiple times, can have side effects and is possibly slow.
So its definitly a bad idea.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-09-04 21:26:16 +02:00
parent 8c6d651fc3
commit d83ff76ca0
1 changed files with 12 additions and 6 deletions
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18
libavutil/intreadwrite.h
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@ -210,7 +210,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
((const uint8_t*)(x))[1])
#endif
#ifndef AV_WB16
# define AV_WB16(p, d) do { \
# define AV_WB16(p, darg) do { \
unsigned d = (darg); \
((uint8_t*)(p))[1] = (d); \
((uint8_t*)(p))[0] = (d)>>8; \
} while(0)
@ -222,7 +223,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
((const uint8_t*)(x))[0])
#endif
#ifndef AV_WL16
# define AV_WL16(p, d) do { \
# define AV_WL16(p, darg) do { \
unsigned d = (darg); \
((uint8_t*)(p))[0] = (d); \
((uint8_t*)(p))[1] = (d)>>8; \
} while(0)
@ -236,7 +238,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
((const uint8_t*)(x))[3])
#endif
#ifndef AV_WB32
# define AV_WB32(p, d) do { \
# define AV_WB32(p, darg) do { \
unsigned d = (darg); \
((uint8_t*)(p))[3] = (d); \
((uint8_t*)(p))[2] = (d)>>8; \
((uint8_t*)(p))[1] = (d)>>16; \
@ -252,7 +255,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
((const uint8_t*)(x))[0])
#endif
#ifndef AV_WL32
# define AV_WL32(p, d) do { \
# define AV_WL32(p, darg) do { \
unsigned d = (darg); \
((uint8_t*)(p))[0] = (d); \
((uint8_t*)(p))[1] = (d)>>8; \
((uint8_t*)(p))[2] = (d)>>16; \
@ -272,7 +276,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
(uint64_t)((const uint8_t*)(x))[7])
#endif
#ifndef AV_WB64
# define AV_WB64(p, d) do { \
# define AV_WB64(p, darg) do { \
uint64_t d = (darg); \
((uint8_t*)(p))[7] = (d); \
((uint8_t*)(p))[6] = (d)>>8; \
((uint8_t*)(p))[5] = (d)>>16; \
@ -296,7 +301,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
(uint64_t)((const uint8_t*)(x))[0])
#endif
#ifndef AV_WL64
# define AV_WL64(p, d) do { \
# define AV_WL64(p, darg) do { \
uint64_t d = (darg); \
((uint8_t*)(p))[0] = (d); \
((uint8_t*)(p))[1] = (d)>>8; \
((uint8_t*)(p))[2] = (d)>>16; \