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| author | Kenneth Heafield <github@kheafield.com> | 2012-02-28 22:58:00 +0400 |
|---|---|---|
| committer | Kenneth Heafield <github@kheafield.com> | 2012-02-28 22:58:00 +0400 |
| commit | e48de47c2381547f78f4dbd89f4fa3e76ba0c6bf (patch) | |
| tree | cdcbb888209bee7dd9c02a7d678cce4262c35416 /util/bit_packing.hh | |
| parent | 7927979298644923cf02ad6c757c3d7c209e365a (diff) | |
KenLM 98814b2 including faster malloc-backed building and portability improvements
Diffstat (limited to 'util/bit_packing.hh')
| -rw-r--r-- | util/bit_packing.hh | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/util/bit_packing.hh b/util/bit_packing.hh index f28f71f81..73a5cb226 100644 --- a/util/bit_packing.hh +++ b/util/bit_packing.hh @@ -47,7 +47,14 @@ inline uint8_t BitPackShift(uint8_t bit, uint8_t length) { #endif inline uint64_t ReadOff(const void *base, uint64_t bit_off) { +#if defined(__arm) || defined(__arm__) + const uint8_t *base_off = reinterpret_cast<const uint8_t*>(base) + (bit_off >> 3); + uint64_t value64; + memcpy(&value64, base_off, sizeof(value64)); + return value64; +#else return *reinterpret_cast<const uint64_t*>(reinterpret_cast<const uint8_t*>(base) + (bit_off >> 3)); +#endif } /* Pack integers up to 57 bits using their least significant digits. @@ -75,7 +82,14 @@ inline void WriteInt57(void *base, uint64_t bit_off, uint8_t length, uint64_t va /* Same caveats as above, but for a 25 bit limit. */ inline uint32_t ReadInt25(const void *base, uint64_t bit_off, uint8_t length, uint32_t mask) { +#if defined(__arm) || defined(__arm__) + const uint8_t *base_off = reinterpret_cast<const uint8_t*>(base) + (bit_off >> 3); + uint32_t value32; + memcpy(&value32, base_off, sizeof(value32)); + return (value32 >> BitPackShift(bit_off & 7, length)) & mask; +#else return (*reinterpret_cast<const uint32_t*>(reinterpret_cast<const uint8_t*>(base) + (bit_off >> 3)) >> BitPackShift(bit_off & 7, length)) & mask; +#endif } inline void WriteInt25(void *base, uint64_t bit_off, uint8_t length, uint32_t value) { |