diff options
Diffstat (limited to 'tests/benchmarks/corelib/tools/qhash/outofline.cpp')
-rw-r--r-- | tests/benchmarks/corelib/tools/qhash/outofline.cpp | 48 |
1 files changed, 9 insertions, 39 deletions
diff --git a/tests/benchmarks/corelib/tools/qhash/outofline.cpp b/tests/benchmarks/corelib/tools/qhash/outofline.cpp index 162c604a35..75d99f96f8 100644 --- a/tests/benchmarks/corelib/tools/qhash/outofline.cpp +++ b/tests/benchmarks/corelib/tools/qhash/outofline.cpp @@ -41,49 +41,19 @@ #include "main.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 -} - QT_BEGIN_NAMESPACE -uint qHash(const String &str) +uint qHash(const Qt4String &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); - } + int n = str.length(); + const QChar *p = str.unicode(); uint h = 0; - doHash(p, h); - doHash(p + s / 2 - 2, h); - doHash(p + s - 4, h); + + while (n--) { + h = (h << 4) + (*p++).unicode(); + h ^= (h & 0xf0000000) >> 23; + h &= 0x0fffffff; + } return h; } |