Use XXH3 over XXH64 as vespalib string hash function

XXH3 is faster than XXH64 across the board, especially for short inputs.

Change around some tests that implicitly depended on the old hashing.

2 files changed, 2 insertions, 2 deletions

diff --git a/vespalib/src/tests/stllike/hash_test.cpp b/vespalib/src/tests/stllike/hash_test.cpp
index d6f5c2ba65d..2b190b6b2dc 100644
--- a/vespalib/src/tests/stllike/hash_test.cpp
+++ b/vespalib/src/tests/stllike/hash_test.cpp
@@ -33,7 +33,7 @@ namespace {
 TEST("test that hashValue gives expected response")
 {
     const char * s("abcdefghi");
-    EXPECT_EQUAL(2878261200250560019ul, vespalib::hashValue(s));
+    EXPECT_EQUAL(16203358805722239136ul, vespalib::hashValue(s));
     EXPECT_EQUAL(vespalib::hashValue(s), vespalib::hashValue(s, strlen(s)));
     EXPECT_NOT_EQUAL(vespalib::hashValue(s), vespalib::hashValue(s, strlen(s)-1));
 }
diff --git a/vespalib/src/vespa/vespalib/stllike/hash_fun.cpp b/vespalib/src/vespa/vespalib/stllike/hash_fun.cpp
index f057a229098..8e1d6061ff0 100644
--- a/vespalib/src/vespa/vespalib/stllike/hash_fun.cpp
+++ b/vespalib/src/vespa/vespalib/stllike/hash_fun.cpp
@@ -22,7 +22,7 @@ hashValue(const char *str) noexcept
 size_t
 hashValue(const void * buf, size_t sz) noexcept
 {
-    return XXH64(buf, sz, 0);
+    return XXH3_64bits(buf, sz);
 }
 
 }