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util: move MapIntoRange() for reuse in fuzz tests

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This commit is contained in:
fanquake
2021-12-13 20:54:30 +08:00
parent bf66e258a8
commit df2307cdc3
3 changed files with 31 additions and 45 deletions
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14
src/test/fuzz/golomb_rice.cpp
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@@ -19,20 +19,6 @@
#include <vector>
namespace {
uint64_t MapIntoRange(const uint64_t x, const uint64_t n)
{
const uint64_t x_hi = x >> 32;
const uint64_t x_lo = x & 0xFFFFFFFF;
const uint64_t n_hi = n >> 32;
const uint64_t n_lo = n & 0xFFFFFFFF;
const uint64_t ac = x_hi * n_hi;
const uint64_t ad = x_hi * n_lo;
const uint64_t bc = x_lo * n_hi;
const uint64_t bd = x_lo * n_lo;
const uint64_t mid34 = (bd >> 32) + (bc & 0xFFFFFFFF) + (ad & 0xFFFFFFFF);
const uint64_t upper64 = ac + (bc >> 32) + (ad >> 32) + (mid34 >> 32);
return upper64;
}
uint64_t HashToRange(const std::vector<uint8_t>& element, const uint64_t f)
{