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hash unit tests.

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This commit is contained in:
Ben Judd 2021-04-17 13:19:35 -07:00
parent 88e6fd64ad
commit 161ca6d4d1
1 changed files with 20 additions and 3 deletions
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23
src/hash.cc
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@ -3,6 +3,9 @@
#include <cstdint> #include <cstdint>
#include <cstring> #include <cstring>
#include "unit_tests.hh"
#include "assert.hh"
namespace Kakoune namespace Kakoune
{ {
@ -50,10 +53,12 @@ size_t hash_data(const char* input, size_t len)
const uint8_t* tail = data + nblocks * 4; const uint8_t* tail = data + nblocks * 4;
uint32_t key = 0; uint32_t key = 0;
switch (len & 3) switch (len & 0b11)
{ {
case 3: key ^= tail[2] << 16; /* fallthrough */ case 3: key ^= tail[2] << 16;
case 2: key ^= tail[1] << 8; /* fallthrough */ [[fallthrough]];
case 2: key ^= tail[1] << 8;
[[fallthrough]];
case 1: key ^= tail[0]; case 1: key ^= tail[0];
key *= c1; key *= c1;
key = rotl(key,15); key = rotl(key,15);
@ -67,4 +72,16 @@ size_t hash_data(const char* input, size_t len)
return hash; return hash;
} }
UnitTest test_murmer_hash{[] {
{
constexpr char data[] = "Hello, World!";
kak_assert(hash_data(data, strlen(data)) == 0xf816f95b);
}
{
constexpr char data[] = "xxxxxxxxxxxxxxxxxxxxxxxxxxxx";
kak_assert(hash_data(data, strlen(data)) == 3551113186);
}
kak_assert(hash_data("", 0) == 2572747774);
}};
} }