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intreadwrite: Dont evaluate value for AV_W* multiple times.
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>tags/n1.0
Michael Niedermayer
13 years ago
1 changed files with 12 additions and 6 deletions
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-
+12 -6libavutil/intreadwrite.h
+ 12
- 6
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]) | ((const uint8_t*)(x))[1]) | ||||
| #endif | #endif | ||||
| #ifndef AV_WB16 | #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))[1] = (d); \ | ||||
| ((uint8_t*)(p))[0] = (d)>>8; \ | ((uint8_t*)(p))[0] = (d)>>8; \ | ||||
| } while(0) | } while(0) | ||||
| @@ -222,7 +223,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; | |||||
| ((const uint8_t*)(x))[0]) | ((const uint8_t*)(x))[0]) | ||||
| #endif | #endif | ||||
| #ifndef AV_WL16 | #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))[0] = (d); \ | ||||
| ((uint8_t*)(p))[1] = (d)>>8; \ | ((uint8_t*)(p))[1] = (d)>>8; \ | ||||
| } while(0) | } while(0) | ||||
| @@ -236,7 +238,8 @@ union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias; | |||||
| ((const uint8_t*)(x))[3]) | ((const uint8_t*)(x))[3]) | ||||
| #endif | #endif | ||||
| #ifndef AV_WB32 | #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))[3] = (d); \ | ||||
| ((uint8_t*)(p))[2] = (d)>>8; \ | ((uint8_t*)(p))[2] = (d)>>8; \ | ||||
| ((uint8_t*)(p))[1] = (d)>>16; \ | ((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]) | ((const uint8_t*)(x))[0]) | ||||
| #endif | #endif | ||||
| #ifndef AV_WL32 | #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))[0] = (d); \ | ||||
| ((uint8_t*)(p))[1] = (d)>>8; \ | ((uint8_t*)(p))[1] = (d)>>8; \ | ||||
| ((uint8_t*)(p))[2] = (d)>>16; \ | ((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]) | (uint64_t)((const uint8_t*)(x))[7]) | ||||
| #endif | #endif | ||||
| #ifndef AV_WB64 | #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))[7] = (d); \ | ||||
| ((uint8_t*)(p))[6] = (d)>>8; \ | ((uint8_t*)(p))[6] = (d)>>8; \ | ||||
| ((uint8_t*)(p))[5] = (d)>>16; \ | ((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]) | (uint64_t)((const uint8_t*)(x))[0]) | ||||
| #endif | #endif | ||||
| #ifndef AV_WL64 | #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))[0] = (d); \ | ||||
| ((uint8_t*)(p))[1] = (d)>>8; \ | ((uint8_t*)(p))[1] = (d)>>8; \ | ||||
| ((uint8_t*)(p))[2] = (d)>>16; \ | ((uint8_t*)(p))[2] = (d)>>16; \ | ||||