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On little endian architectures, use LWIP_PLATFORM_HTONS (if defined) for SWAP_BYTES_IN_WORD to speed up checksumming.

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goldsimon
2009-05-06 17:35:50 +00:00
parent ac9e758f41
commit 95f6dc7011
2 changed files with 11 additions and 0 deletions
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7
src/core/ipv4/inet_chksum.c
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@@ -64,7 +64,14 @@
#endif
/** Like the name says... */
#if LWIP_PLATFORM_BYTESWAP && (BYTE_ORDER == LITTLE_ENDIAN)
/* little endian and PLATFORM_BYTESWAP defined */
#define SWAP_BYTES_IN_WORD(w) LWIP_PLATFORM_HTONS(x)
#else
/* can't use htons on big endian (or PLATFORM_BYTESWAP not defined)... */
#define SWAP_BYTES_IN_WORD(w) ((w & 0xff) << 8) | ((w & 0xff00) >> 8)
#endif
/** Split an u32_t in two u16_ts and add them up */
#define FOLD_U32T(u) ((u >> 16) + (u & 0x0000ffffUL))