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e30056275c
Since commit 70aab459, the msvc and MinGW builds have relied on
the built-in implementation of ntohl() and htonl(), rather than
linking the wsock32 library. The new index manipulation code now
calls ntohs()/htons() in addition to ntohl()/htonl(), so we need
to provide a built-in implementation of the 16-bit functions.
Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
98 lines
1.9 KiB
C
98 lines
1.9 KiB
C
/*
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* Let's make sure we always have a sane definition for ntohl()/htonl().
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* Some libraries define those as a function call, just to perform byte
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* shifting, bringing significant overhead to what should be a simple
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* operation.
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*/
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#include "common.h"
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/*
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* Default version that the compiler ought to optimize properly with
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* constant values.
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*/
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GIT_INLINE(uint32_t) default_swab32(uint32_t val)
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{
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return (((val & 0xff000000) >> 24) |
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((val & 0x00ff0000) >> 8) |
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((val & 0x0000ff00) << 8) |
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((val & 0x000000ff) << 24));
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}
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#undef bswap32
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GIT_INLINE(uint16_t) default_swab16(uint16_t val)
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{
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return (((val & 0xff00) >> 8) |
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((val & 0x00ff) << 8));
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}
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#undef bswap16
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#if defined(__GNUC__) && defined(__i386__)
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#define bswap32(x) ({ \
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uint32_t __res; \
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if (__builtin_constant_p(x)) { \
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__res = default_swab32(x); \
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} else { \
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__asm__("bswap %0" : "=r" (__res) : "0" ((uint32_t)(x))); \
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} \
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__res; })
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#define bswap16(x) ({ \
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uint16_t __res; \
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if (__builtin_constant_p(x)) { \
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__res = default_swab16(x); \
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} else { \
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__asm__("xchgb %b0,%h0" : "=q" (__res) : "0" ((uint16_t)(x))); \
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} \
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__res; })
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#elif defined(__GNUC__) && defined(__x86_64__)
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#define bswap32(x) ({ \
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uint32_t __res; \
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if (__builtin_constant_p(x)) { \
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__res = default_swab32(x); \
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} else { \
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__asm__("bswapl %0" : "=r" (__res) : "0" ((uint32_t)(x))); \
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} \
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__res; })
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#define bswap16(x) ({ \
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uint16_t __res; \
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if (__builtin_constant_p(x)) { \
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__res = default_swab16(x); \
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} else { \
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__asm__("xchgb %b0,%h0" : "=Q" (__res) : "0" ((uint16_t)(x))); \
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} \
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__res; })
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#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))
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#include <stdlib.h>
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#define bswap32(x) _byteswap_ulong(x)
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#define bswap16(x) _byteswap_ushort(x)
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#endif
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#ifdef bswap32
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#undef ntohl
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#undef htonl
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#define ntohl(x) bswap32(x)
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#define htonl(x) bswap32(x)
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#endif
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#ifdef bswap16
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#undef ntohs
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#undef htons
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#define ntohs(x) bswap16(x)
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#define htons(x) bswap16(x)
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#endif
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