mirror of
https://github.com/moses-smt/mosesdecoder.git
synced 2024-12-26 21:42:19 +03:00
41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
#include "util/bit_packing.hh"
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#include "util/exception.hh"
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#include <string.h>
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namespace util {
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namespace {
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template <bool> struct StaticCheck {};
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template <> struct StaticCheck<true> { typedef bool StaticAssertionPassed; };
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// If your float isn't 4 bytes, we're hosed.
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typedef StaticCheck<sizeof(float) == 4>::StaticAssertionPassed FloatSize;
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} // namespace
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uint8_t RequiredBits(uint64_t max_value) {
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if (!max_value) return 0;
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uint8_t ret = 1;
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while (max_value >>= 1) ++ret;
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return ret;
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}
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void BitPackingSanity() {
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const FloatEnc neg1 = { -1.0 }, pos1 = { 1.0 };
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if ((neg1.i ^ pos1.i) != 0x80000000) UTIL_THROW(Exception, "Sign bit is not 0x80000000");
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char mem[57+8];
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memset(mem, 0, sizeof(mem));
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const uint64_t test57 = 0x123456789abcdefULL;
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for (uint64_t b = 0; b < 57 * 8; b += 57) {
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WriteInt57(mem, b, 57, test57);
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}
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for (uint64_t b = 0; b < 57 * 8; b += 57) {
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if (test57 != ReadInt57(mem, b, 57, (1ULL << 57) - 1))
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UTIL_THROW(Exception, "The bit packing routines are failing for your architecture. Please send a bug report with your architecture, operating system, and compiler.");
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}
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// TODO: more checks.
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}
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} // namespace util
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