Add proper detection of x86 RDRAND instruction

The instruction is "RDRAND", but the feature name, according to GCC, is
RDRND, so I had to change some macros in qsimd_p.h.

Change-Id: Icd0e0d4b27cb4e5eb892fffd14b5166779137e63
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

2 files changed, 59 insertions, 0 deletions

diff --git a/config.tests/common/rdrnd/rdrnd.cpp b/config.tests/common/rdrnd/rdrnd.cpp
new file mode 100644
index 0000000000..597f7257bf
--- /dev/null
+++ b/config.tests/common/rdrnd/rdrnd.cpp
@@ -0,0 +1,56 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Intel Corporation.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the config.tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <immintrin.h>
+
+int main(int, char**)
+{
+    unsigned short us;
+    unsigned int ui;
+    if (_rdrand16_step(&us))
+        return 1;
+    if (_rdrand32_step(&ui))
+        return 1;
+#if defined(__x86_64) || defined(__x86_64__) || defined(__amd64) || defined(_M_X64)
+    unsigned long long ull;
+    if (_rdrand64_step(&ull))
+        return 1;
+#endif
+    return 0;
+}
diff --git a/config.tests/common/rdrnd/rdrnd.pro b/config.tests/common/rdrnd/rdrnd.pro
new file mode 100644
index 0000000000..37e636dc3f
--- /dev/null
+++ b/config.tests/common/rdrnd/rdrnd.pro
@@ -0,0 +1,3 @@
+SOURCES += rdrnd.cpp
+!defined(QMAKE_CFLAGS_RDRND, "var"): error("This compiler does not support the RDRAND instruction")
+else: QMAKE_CXXFLAGS += $$QMAKE_CFLAGS_RDRND