Add the SSE2 code we have in Qt 4.7 to the benchmark

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/benchmarks/corelib/tools/qstring/main.cpp b/tests/benchmarks/corelib/tools/qstring/main.cpp
index f957eee..5513724 100644
--- a/tests/benchmarks/corelib/tools/qstring/main.cpp
+++ b/tests/benchmarks/corelib/tools/qstring/main.cpp
@@ -1449,6 +1449,31 @@ void fromLatin1_regular(QChar *dst, const char *str, int size)
         *dst++ = (uchar)*str++;
 }
 
+void fromLatin1_sse2_qt47(QChar *dst, const char *str, int size)
+{
+    if (size >= 16) {
+        int chunkCount = size >> 4; // divided by 16
+        const __m128i nullMask = _mm_set1_epi32(0);
+        for (int i = 0; i < chunkCount; ++i) {
+            const __m128i chunk = _mm_loadu_si128((__m128i*)str); // load
+            str += 16;
+
+            // unpack the first 8 bytes, padding with zeros
+            const __m128i firstHalf = _mm_unpacklo_epi8(chunk, nullMask);
+            _mm_storeu_si128((__m128i*)dst, firstHalf); // store
+            dst += 8;
+
+            // unpack the last 8 bytes, padding with zeros
+            const __m128i secondHalf = _mm_unpackhi_epi8 (chunk, nullMask);
+            _mm_storeu_si128((__m128i*)dst, secondHalf); // store
+            dst += 8;
+        }
+        size = size % 16;
+    }
+    while (size--)
+        *dst++ = (uchar)*str++;
+}
+
 typedef void (* FromLatin1Function)(QChar *, const char *, int);
 Q_DECLARE_METATYPE(FromLatin1Function)
 
@@ -1456,6 +1481,7 @@ void tst_QString::fromLatin1Alternatives_data() const
 {
     QTest::addColumn<FromLatin1Function>("function");
     QTest::newRow("regular") << &fromLatin1_regular;
+    QTest::newRow("sse2-qt4.7") << &fromLatin1_sse2_qt47;
 }
 
 static void fromLatin1Alternatives_internal(FromLatin1Function function, bool doVerify)