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include/share/endswap.h : Improvements to fallthrough ENDSWAP_*.

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According to patch author GCC can optimize expressions like
"(a<<8)|(a>>8)", but has problems with "(a<<8)+(a>>8)".

Patch-from: lvqcl <lvqcl.mail@gmail.com>
This commit is contained in:
Erik de Castro Lopo
2014-08-09 12:47:20 +10:00
parent e9d805dd43
commit 7c66452886
1 changed files with 2 additions and 2 deletions
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4
include/share/endswap.h
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@@ -58,8 +58,8 @@ static inline unsigned short __builtin_bswap16(unsigned short a)
#else
#define ENDSWAP_16(x) ((((x) >> 8) & 0xFF) + (((x) & 0xFF) << 8))
#define ENDSWAP_32(x) ((((x) >> 24) & 0xFF) + (((x) >> 8) & 0xFF00) + (((x) & 0xFF00) << 8) + (((x) & 0xFF) << 24))
#define ENDSWAP_16(x) ((((x) >> 8) & 0xFF) | (((x) & 0xFF) << 8))
#define ENDSWAP_32(x) ((((x) >> 24) & 0xFF) | (((x) >> 8) & 0xFF00) | (((x) & 0xFF00) << 8) | (((x) & 0xFF) << 24))
#endif