Merge branch '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-1 into 4.7-integration

* '4.7' of scm.dev.nokia.troll.no:qt/oslo-staging-1: (57 commits)
  tst_qmake doesn't need QtGui
  Use the full path to qmake in the qmake unit test
  qdoc: Fixed erroneous links to QML basic types.
  Fixed item view background color in Gtk style
  scope fixes and clutter reduction for sql driver projects
  I don't know why some linkers can't call this function, so comment it out.
  QNetworkSession::close() method now send closed() signal while faking disconnection.
  Add the missing license headers to the QString benchmark data
  Fix building of qsimd.cpp on Windows CE
  Use QElapsedTimer for the benchlib tests.
  Properly implement the CPU feature disabling in qsimd.cpp.
  Report the detected CPU features in the corelib boilerplate
  Detect CPU features on ARM by reading the ELF auxvec.
  Split the CPU-detection code into multiple functions for readability
  Fixed delivering gestures to a toplevel widget.
  Unroll the SSSE3 code even more to avoid the need to keep an extra variable for inverting the result
  Don't try to compile the SSE2 and SSSE3 code with compilers that don't support them (e.g. ARM)
  Improve on the SSSE3 with alternate aligning function.
  Add the beginnings of a new SSSE3-based aligning algorithm
  Small fixup
  ...

1 files changed, 151 insertions, 40 deletions

diff --git a/src/corelib/tools/qsimd.cpp b/src/corelib/tools/qsimd.cpp
index 8005d7d..68ab033 100644
--- a/src/corelib/tools/qsimd.cpp
+++ b/src/corelib/tools/qsimd.cpp
@@ -41,6 +41,7 @@
 
 #include "qsimd_p.h"
 #include <QByteArray>
+#include <stdio.h>
 
 #if defined(Q_OS_WINCE)
 #include <windows.h>
@@ -50,15 +51,20 @@
 #include <intrin.h>
 #endif
 
+#if defined(Q_OS_LINUX) && defined(__arm__)
+#include "private/qcore_unix_p.h"
+
+#include <asm/hwcap.h>
+#include <linux/auxvec.h>
+#endif
+
 QT_BEGIN_NAMESPACE
 
-uint qDetectCPUFeatures()
+#if defined (Q_OS_WINCE)
+static inline uint detectProcessorFeatures()
 {
-    static uint features = 0xffffffff;
-    if (features != 0xffffffff)
-        return features;
+    uint features = 0;
 
-#if defined (Q_OS_WINCE)
 #if defined (ARM)
     if (IsProcessorFeaturePresent(PF_ARM_INTEL_WMMX)) {
         features = IWMMXT;
@@ -78,22 +84,57 @@ uint qDetectCPUFeatures()
 #endif
     features = 0;
     return features;
-#elif defined(QT_HAVE_IWMMXT)
+}
+
+#elif defined(__arm__) || defined(__arm) || defined(QT_HAVE_IWMMXT) || defined(QT_HAVE_NEON)
+static inline uint detectProcessorFeatures()
+{
+    uint features = 0;
+
+#if defined(Q_OS_LINUX)
+    int auxv = ::qt_safe_open("/proc/self/auxv", O_RDONLY);
+    if (auxv != -1) {
+        unsigned long vector[64];
+        int nread;
+        while (features == 0) {
+            nread = ::qt_safe_read(auxv, (char *)vector, sizeof vector);
+            if (nread <= 0) {
+                // EOF or error
+                break;
+            }
+
+            int max = nread / (sizeof vector[0]);
+            for (int i = 0; i < max; i += 2)
+                if (vector[i] == AT_HWCAP) {
+                    if (vector[i+1] & HWCAP_IWMMXT)
+                        features |= IWMMXT;
+                    if (vector[i+1] & HWCAP_NEON)
+                        features |= NEON;
+                    break;
+                }
+        }
+
+        ::qt_safe_close(auxv);
+        return features;
+    }
+    // fall back if /proc/self/auxv wasn't found
+#endif
+
+#if defined(QT_HAVE_IWMMXT)
     // runtime detection only available when running as a previlegied process
-    static const bool doIWMMXT = !qgetenv("QT_NO_IWMMXT").toInt();
-    features = doIWMMXT ? IWMMXT : 0;
-    return features;
+    features = IWMMXT;
 #elif defined(QT_HAVE_NEON)
-    static const bool doNEON = !qgetenv("QT_NO_NEON").toInt();
-    features = doNEON ? NEON : 0;
+    features = NEON;
+#endif
+
     return features;
-#else
-    features = 0;
-#if defined(__x86_64__) || defined(Q_OS_WIN64)
-    features = MMX|SSE|SSE2|CMOV;
-#elif defined(__ia64__)
-    features = MMX|SSE|SSE2;
+}
+
 #elif defined(__i386__) || defined(_M_IX86)
+static inline uint detectProcessorFeatures()
+{
+    uint features = 0;
+
     unsigned int extended_result = 0;
     unsigned int feature_result = 0;
     uint result = 0;
@@ -149,6 +190,7 @@ uint qDetectCPUFeatures()
         :
         : "%eax", "%ecx", "%edx"
         );
+
 #elif defined (Q_OS_WIN)
     _asm {
         push eax
@@ -210,6 +252,7 @@ uint qDetectCPUFeatures()
     }
 #endif
 
+
     // result now contains the standard feature bits
     if (result & (1u << 15))
         features |= CMOV;
@@ -236,9 +279,13 @@ uint qDetectCPUFeatures()
     if (feature_result & (1u << 28))
         features |= AVX;
 
-#endif // i386
+    return features;
+}
 
-#if defined(__x86_64__) || defined(Q_OS_WIN64)
+#elif defined(__x86_64) || defined(Q_OS_WIN64)
+static inline uint detectProcessorFeatures()
+{
+    uint features = MMX|SSE|SSE2|CMOV;
     uint feature_result = 0;
 
 #if defined(Q_CC_GNU)
@@ -282,33 +329,97 @@ uint qDetectCPUFeatures()
         features |= SSE4_2;
     if (feature_result & (1u << 28))
         features |= AVX;
-#endif // x86_64
 
-#if defined(QT_HAVE_MMX)
-    if (qgetenv("QT_NO_MMX").toInt())
-        features ^= MMX;
-#endif
-    if (qgetenv("QT_NO_MMXEXT").toInt())
-        features ^= MMXEXT;
+    return features;
+}
 
-#if defined(QT_HAVE_3DNOW)
-    if (qgetenv("QT_NO_3DNOW").toInt())
-        features ^= MMX3DNOW;
-#endif
-    if (qgetenv("QT_NO_3DNOWEXT").toInt())
-        features ^= MMX3DNOWEXT;
+#elif defined(__ia64__)
+static inline uint detectProcessorFeatures()
+{
+    return MMX|SSE|SSE2;
+}
 
-#if defined(QT_HAVE_SSE)
-    if (qgetenv("QT_NO_SSE").toInt())
-        features ^= SSE;
-#endif
-#if defined(QT_HAVE_SSE2)
-    if (qgetenv("QT_NO_SSE2").toInt())
-        features ^= SSE2;
+#else
+static inline uint detectProcessorFeatures()
+{
+    return 0;
+}
 #endif
 
+/*
+ * Use kdesdk/scripts/generate_string_table.pl to update the table below.
+ * Here's the data (don't forget the ONE leading space):
+ mmx
+ mmxext
+ mmx3dnow
+ mmx3dnowext
+ sse
+ sse2
+ cmov
+ iwmmxt
+ neon
+ sse3
+ ssse3
+ sse4.1
+ sse4.2
+ avx
+  */
+
+// begin generated
+static const char features_string[] =
+    " mmx\0"
+    " mmxext\0"
+    " mmx3dnow\0"
+    " mmx3dnowext\0"
+    " sse\0"
+    " sse2\0"
+    " cmov\0"
+    " iwmmxt\0"
+    " neon\0"
+    " sse3\0"
+    " ssse3\0"
+    " sse4.1\0"
+    " sse4.2\0"
+    " avx\0"
+    "\0";
+
+static const int features_indices[] = {
+       0,    5,   13,   23,   36,   41,   47,   53,
+      61,   67,   73,   80,   88,   96,   -1
+};
+// end generated
+
+const int features_count = (sizeof features_indices - 1) / (sizeof features_indices[0]);
+
+uint qDetectCPUFeatures()
+{
+    static QBasicAtomicInt features = Q_BASIC_ATOMIC_INITIALIZER(-1);
+    if (features != -1)
+        return features;
+
+    uint f = detectProcessorFeatures();
+    QByteArray disable = qgetenv("QT_NO_CPU_FEATURE");
+    if (!disable.isEmpty()) {
+        disable.prepend(' ');
+        for (int i = 0; i < features_count; ++i) {
+            if (disable.contains(features_string + features_indices[i]))
+                f &= ~(1 << i);
+        }
+    }
+
+    features = f;
     return features;
-#endif
+}
+
+void qDumpCPUFeatures()
+{
+    uint features = qDetectCPUFeatures();
+    printf("Processor features: ");
+    for (int i = 0; i < features_count; ++i) {
+        if (features & (1 << i))
+            printf("%s", features_string + features_indices[i]);
+    }
+    puts("");
 }
 
 QT_END_NAMESPACE