https://perl5.git.perl.org / perl5.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c4b2386 YO |
1 | #ifndef PERL_SEEN_HV_MACRO_H /* compile once */ |
| 2 | #define PERL_SEEN_HV_MACRO_H | |
| 3 | ||
| 4 | #if IVSIZE == 8 | |
| 5 | #define CAN64BITHASH | |
| 6 | #endif | |
| 7 | ||
| 8 | /*----------------------------------------------------------------------------- | |
| 9 | * Endianess, misalignment capabilities and util macros | |
| 10 | * | |
| 11 | * The following 3 macros are defined in this section. The other macros defined | |
| 12 | * are only needed to help derive these 3. | |
| 13 | * | |
| 14 | * U8TO16_LE(x) Read a little endian unsigned 32-bit int | |
| 15 | * U8TO32_LE(x) Read a little endian unsigned 32-bit int | |
| 16 | * U8TO28_LE(x) Read a little endian unsigned 32-bit int | |
| 17 | * ROTL32(x,r) Rotate x left by r bits | |
| 18 | * ROTL64(x,r) Rotate x left by r bits | |
| 19 | * ROTR32(x,r) Rotate x right by r bits | |
| 20 | * ROTR64(x,r) Rotate x right by r bits | |
| 21 | */ | |
| 22 | ||
| 23 | #ifndef U32_ALIGNMENT_REQUIRED | |
| 24 | #if (BYTEORDER == 0x1234 || BYTEORDER == 0x12345678) | |
| 25 | #define U8TO16_LE(ptr) (*((const U16*)(ptr))) | |
| 26 | #define U8TO32_LE(ptr) (*((const U32*)(ptr))) | |
| 27 | #define U8TO64_LE(ptr) (*((const U64*)(ptr))) | |
| 28 | #elif (BYTEORDER == 0x4321 || BYTEORDER == 0x87654321) | |
| 29 | #if defined(__GNUC__) && (__GNUC__>4 || (__GNUC__==4 && __GNUC_MINOR__>=3)) | |
| 30 | #define U8TO16_LE(ptr) (__builtin_bswap16(*((U16*)(ptr)))) | |
| 31 | #define U8TO32_LE(ptr) (__builtin_bswap32(*((U32*)(ptr)))) | |
| 32 | #define U8TO64_LE(ptr) (__builtin_bswap64(*((U64*)(ptr)))) | |
| 33 | #endif | |
| 34 | #endif | |
| 35 | #endif | |
| 36 | ||
| 37 | #ifndef U8TO16_LE | |
| 38 | /* Without a known fast bswap32 we're just as well off doing this */ | |
| 39 | #define U8TO16_LE(ptr) ((U32)(ptr)[0]|(U32)(ptr)[1]<<8) | |
| 40 | #define U8TO32_LE(ptr) ((U32)(ptr)[0]|(U32)(ptr)[1]<<8|(U32)(ptr)[2]<<16|(U32)(ptr)[3]<<24) | |
| 41 | #define U8TO64_LE(ptr) ((U64)(ptr)[0]|(U64)(ptr)[1]<<8|(U64)(ptr)[2]<<16|(U64)(ptr)[3]<<24|\ | |
| 42 | (U64)(ptr)[4]<<32|(U64)(ptr)[5]<<40|\ | |
| 43 | (U64)(ptr)[6]<<48|(U64)(ptr)[7]<<56) | |
| 44 | #endif | |
| 45 | ||
| 46 | #ifdef CAN64BITHASH | |
| 47 | #ifndef U64TYPE | |
| 48 | /* This probably isn't going to work, but failing with a compiler error due to | |
| 49 | lack of uint64_t is no worse than failing right now with an #error. */ | |
| 50 | #define U64 uint64_t | |
| 51 | #endif | |
| 52 | #endif | |
| 53 | ||
| 54 | /* Find best way to ROTL32/ROTL64 */ | |
| 55 | #if defined(_MSC_VER) | |
| 56 | #include <stdlib.h> /* Microsoft put _rotl declaration in here */ | |
| 57 | #define ROTL32(x,r) _rotl(x,r) | |
| 58 | #define ROTR32(x,r) _rotr(x,r) | |
| 59 | #define ROTL64(x,r) _rotl64(x,r) | |
| 60 | #define ROTR64(x,r) _rotr64(x,r) | |
| 61 | #else | |
| 62 | /* gcc recognises this code and generates a rotate instruction for CPUs with one */ | |
| 63 | #define ROTL32(x,r) (((U32)(x) << (r)) | ((U32)(x) >> (32 - (r)))) | |
| 64 | #define ROTR32(x,r) (((U32)(x) << (32 - (r))) | ((U32)(x) >> (r))) | |
| 65 | #define ROTL64(x,r) ( ( (U64)(x) << (r) ) | ( (U64)(x) >> ( 64 - (r) ) ) ) | |
| 66 | #define ROTR64(x,r) ( ( (U64)(x) << ( 64 - (r) ) ) | ( (U64)(x) >> (r) ) ) | |
| 67 | #endif | |
| 68 | ||
| 69 | ||
| 70 | #ifdef UV_IS_QUAD | |
| 71 | #define ROTL_UV(x,r) ROTL64(x,r) | |
| 72 | #define ROTR_UV(x,r) ROTL64(x,r) | |
| 73 | #else | |
| 74 | #define ROTL_UV(x,r) ROTL32(x,r) | |
| 75 | #define ROTR_UV(x,r) ROTR32(x,r) | |
| 76 | #endif | |
| 77 | #if IVSIZE == 8 | |
| 78 | #define CAN64BITHASH | |
| 79 | #endif | |
| 80 | ||
| 81 | #endif |