search for: rfc1952

Displaying 4 results from an estimated 4 matches for "rfc1952".

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2018 Nov 06
4
Rather poor code optimisation of current clang/LLVM targeting Intel x86 (both -64 and -32)
...(32 - n)); } and typically generates "rotate" machine instructions for this expression, it fails to recognize other also common bit-twiddling idioms/expressions. The standard IEEE CRC-32 for "big endian" alias "network" byte order (see <https://tools.ietf.org/html/rfc1952#section-8> for example): unsigned int crc32be(unsigned char const *octets, unsigned int count) { unsigned int crc = 0L; unsigned int i; while (count--) { crc ^= *octets++ << 24; for (i = 8; i > 0; i--) if (crc & 0x80000000L) // t...
2018 Nov 27
2
Rather poor code optimisation of current clang/LLVM targeting Intel x86 (both -64 and -32)
...rotate" machine instructions for this >> expression, it fails to recognize other also common bit-twiddling >> idioms/expressions. >> >> The standard IEEE CRC-32 for "big endian" alias "network" byte order >> (see <https://tools.ietf.org/html/rfc1952#section-8> for example): >> >> unsigned int crc32be(unsigned char const *octets, unsigned int count) >> { >> unsigned int crc = 0L; >> unsigned int i; >> >> while (count--) { >> crc ^= *octets++ << 24; >> for...
2002 Jul 02
2
[PATCH] Compressed output files
Attached is a patch that implements compressing output files as they're written to disk, uzing zlib. Thus far I've only used it with synchronizing directories on a single machine. What seems to work / what's done: - Synchronizing directories with all files in the target directory gzip'd. Files seem to contain the correct data. Use the option "--gzip-dest". -
2018 Nov 28
2
Rather poor code optimisation of current clang/LLVM targeting Intel x86 (both -64 and -32)
...t;> >> expression, it fails to recognize other also common bit-twiddling >> >> idioms/expressions. >> >> >> >> The standard IEEE CRC-32 for "big endian" alias "network" byte order >> >> (see <https://tools.ietf.org/html/rfc1952#section-8> for example): >> >> >> >> unsigned int crc32be(unsigned char const *octets, unsigned int count) >> >> { >> >> unsigned int crc = 0L; >> >> unsigned int i; >> >> >> >> while (count--) { >...