82 lines
2.9 KiB
C
82 lines
2.9 KiB
C
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#ifndef PERL_SEEN_HV_MACRO_H /* compile once */
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#define PERL_SEEN_HV_MACRO_H
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#if IVSIZE == 8
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#define CAN64BITHASH
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#endif
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/*-----------------------------------------------------------------------------
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* Endianess, misalignment capabilities and util macros
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*
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* The following 3 macros are defined in this section. The other macros defined
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* are only needed to help derive these 3.
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*
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* U8TO16_LE(x) Read a little endian unsigned 32-bit int
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* U8TO32_LE(x) Read a little endian unsigned 32-bit int
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* U8TO28_LE(x) Read a little endian unsigned 32-bit int
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* ROTL32(x,r) Rotate x left by r bits
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* ROTL64(x,r) Rotate x left by r bits
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* ROTR32(x,r) Rotate x right by r bits
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* ROTR64(x,r) Rotate x right by r bits
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*/
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#ifndef U32_ALIGNMENT_REQUIRED
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#if (BYTEORDER == 0x1234 || BYTEORDER == 0x12345678)
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#define U8TO16_LE(ptr) (*((const U16*)(ptr)))
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#define U8TO32_LE(ptr) (*((const U32*)(ptr)))
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#define U8TO64_LE(ptr) (*((const U64*)(ptr)))
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#elif (BYTEORDER == 0x4321 || BYTEORDER == 0x87654321)
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#if defined(__GNUC__) && (__GNUC__>4 || (__GNUC__==4 && __GNUC_MINOR__>=3))
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#define U8TO16_LE(ptr) (__builtin_bswap16(*((U16*)(ptr))))
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#define U8TO32_LE(ptr) (__builtin_bswap32(*((U32*)(ptr))))
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#define U8TO64_LE(ptr) (__builtin_bswap64(*((U64*)(ptr))))
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#endif
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#endif
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#endif
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#ifndef U8TO16_LE
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/* Without a known fast bswap32 we're just as well off doing this */
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#define U8TO16_LE(ptr) ((U32)(ptr)[0]|(U32)(ptr)[1]<<8)
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#define U8TO32_LE(ptr) ((U32)(ptr)[0]|(U32)(ptr)[1]<<8|(U32)(ptr)[2]<<16|(U32)(ptr)[3]<<24)
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#define U8TO64_LE(ptr) ((U64)(ptr)[0]|(U64)(ptr)[1]<<8|(U64)(ptr)[2]<<16|(U64)(ptr)[3]<<24|\
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(U64)(ptr)[4]<<32|(U64)(ptr)[5]<<40|\
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(U64)(ptr)[6]<<48|(U64)(ptr)[7]<<56)
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#endif
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#ifdef CAN64BITHASH
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#ifndef U64TYPE
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/* This probably isn't going to work, but failing with a compiler error due to
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lack of uint64_t is no worse than failing right now with an #error. */
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#define U64 uint64_t
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#endif
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#endif
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/* Find best way to ROTL32/ROTL64 */
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#if defined(_MSC_VER)
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#include <stdlib.h> /* Microsoft put _rotl declaration in here */
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#define ROTL32(x,r) _rotl(x,r)
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#define ROTR32(x,r) _rotr(x,r)
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#define ROTL64(x,r) _rotl64(x,r)
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#define ROTR64(x,r) _rotr64(x,r)
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#else
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/* gcc recognises this code and generates a rotate instruction for CPUs with one */
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#define ROTL32(x,r) (((U32)(x) << (r)) | ((U32)(x) >> (32 - (r))))
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#define ROTR32(x,r) (((U32)(x) << (32 - (r))) | ((U32)(x) >> (r)))
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#define ROTL64(x,r) ( ( (U64)(x) << (r) ) | ( (U64)(x) >> ( 64 - (r) ) ) )
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#define ROTR64(x,r) ( ( (U64)(x) << ( 64 - (r) ) ) | ( (U64)(x) >> (r) ) )
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#endif
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#ifdef UV_IS_QUAD
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#define ROTL_UV(x,r) ROTL64(x,r)
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#define ROTR_UV(x,r) ROTL64(x,r)
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#else
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#define ROTL_UV(x,r) ROTL32(x,r)
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#define ROTR_UV(x,r) ROTR32(x,r)
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#endif
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#if IVSIZE == 8
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#define CAN64BITHASH
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#endif
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#endif
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