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--- qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/qv4global_p.h	2017-04-21 20:34:05.000000000 +0200
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+++ qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/qv4global_p.h.new	2017-05-06 09:23:00.894049064 +0200
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@@ -95,7 +95,7 @@
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 //
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 // NOTE: This should match the logic in qv4targetplatform_p.h!
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-#if defined(Q_PROCESSOR_X86) && (QT_POINTER_SIZE == 4) \
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+#if defined(Q_PROCESSOR_X86) && (QT_POINTER_SIZE == 4) && defined(__SSE2__) \
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     && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_FREEBSD))
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 #  define V4_ENABLE_JIT
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 #elif defined(Q_PROCESSOR_X86_64) && (QT_POINTER_SIZE == 8) \
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--- qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/jsruntime.pri	2017-04-21 20:34:05.000000000 +0200
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+++ qtdeclarative-opensource-src-5.9.0-beta3/src/qml/jsruntime/jsruntime.pri.new	2017-05-06 09:25:12.698437577 +0200
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@@ -115,6 +115,11 @@
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     $$PWD/qv4value.cpp \
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     $$PWD/qv4executableallocator.cpp
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+linux-g++*:isEqual(QT_ARCH,i386):!no_sse2 {
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+    QMAKE_CFLAGS += -msse2 -mfpmath=sse
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+    QMAKE_CXXFLAGS += -msse2 -mfpmath=sse
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+}
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+
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 valgrind {
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     DEFINES += V4_USE_VALGRIND
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 }
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--- qtdeclarative-opensource-src-5.9.0-beta3/src/qml/qml/v8/qv8engine.cpp	2017-04-21 20:34:05.000000000 +0200
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+++ qtdeclarative-opensource-src-5.9.0-beta3/src/qml/qml/v8/qv8engine.cpp.new	2017-05-06 09:27:19.373810971 +0200
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@@ -129,7 +129,7 @@
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     , m_xmlHttpRequestData(0)
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     , m_listModelData(0)
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 {
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-#ifdef Q_PROCESSOR_X86_32
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+#if defined(Q_PROCESSOR_X86_32) && defined(__SSE2__)
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     if (!qCpuHasFeature(SSE2)) {
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         qFatal("This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer");
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     }