Remove qhash_faster.

It's not faster under _any_ metric than the new algorithm, and it loses a lot of
spread which is a bad thing.

Change-Id: Ic87258f1c887822ffea1cb1517355564fabc3c26
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>

1 files changed, 0 insertions, 44 deletions

diff --git a/tests/benchmarks/corelib/tools/qhash/outofline.cpp b/tests/benchmarks/corelib/tools/qhash/outofline.cpp
index 8adaa0a04f..75d99f96f8 100644
--- a/tests/benchmarks/corelib/tools/qhash/outofline.cpp
+++ b/tests/benchmarks/corelib/tools/qhash/outofline.cpp
@@ -57,50 +57,6 @@ uint qHash(const Qt4String &str)
     return h;
 }
 
-static void doHash(const unsigned short *p, uint &h)
-{
-#if 1
-    // Copied from static uint hash(const QChar *p, int n).
-    // Possibly not the cheapest way.
-    h = (h << 4) + (*p++);
-    h ^= (h & 0xf0000000) >> 23;
-    h &= 0x0fffffff;
-
-    h = (h << 4) + (*p++);
-    h ^= (h & 0xf0000000) >> 23;
-    h &= 0x0fffffff;
-
-    h = (h << 4) + (*p++);
-    h ^= (h & 0xf0000000) >> 23;
-    h &= 0x0fffffff;
-
-    h = (h << 4) + (*p++);
-    h ^= (h & 0xf0000000) >> 23;
-    h &= 0x0fffffff;
-#else
-    // Faster, but probably less spread.
-    h ^= *(unsigned int *)p;
-#endif
-}
-
-uint qHash(const String &str)
-{
-    const unsigned short *p = (unsigned short *)str.constData();
-    const int s = str.size();
-    switch (s) {
-        case 0: return 0;
-        case 1: return *p;
-        case 2: return *(unsigned int *)p;
-        case 3: return (*(unsigned int *)p) ^ *(p + 2);
-        //case 3: return (*p << 11) + (*(p + 1) << 22) + *(p + 2);
-    }
-    uint h = 0;
-    doHash(p, h);
-    doHash(p + s / 2 - 2, h);
-    doHash(p + s - 4, h);
-    return h;
-}
-
 // The Java's hashing algorithm for strings is a variation of D. J. Bernstein
 // hashing algorithm appeared here http://cr.yp.to/cdb/cdb.txt
 // and informally known as DJB33XX - DJB's 33 Times Xor.