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It is no longer possible to remove the SSE2 requirement.
So we remove the JIT entirely on pmmx/x86.
--- qtdeclarative-everywhere-src-5.12.6/src/qml/jsruntime/qv4global_p.h.old 2019-11-07 11:01:48.000000000 +0000
+++ qtdeclarative-everywhere-src-5.12.6/src/qml/jsruntime/qv4global_p.h 2019-12-27 06:11:55.456270846 +0000
@@ -88,10 +88,7 @@
//
// NOTE: This should match the logic in qv4targetplatform_p.h!
-#if defined(Q_PROCESSOR_X86_32) && (QT_POINTER_SIZE == 4) \
- && (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_FREEBSD))
-# define V4_ENABLE_JIT
-#elif defined(Q_PROCESSOR_X86_64) && (QT_POINTER_SIZE == 8) \
+#if defined(Q_PROCESSOR_X86_64) && (QT_POINTER_SIZE == 8) \
&& (defined(Q_OS_WIN) || defined(Q_OS_LINUX) || defined(Q_OS_QNX) || defined(Q_OS_MAC) || defined(Q_OS_FREEBSD))
# define V4_ENABLE_JIT
#elif defined(Q_PROCESSOR_ARM_32) && (QT_POINTER_SIZE == 4) \
--- qtdeclarative-everywhere-src-5.12.6/src/qml/qml/v8/qv8engine.cpp.old 2019-11-07 11:01:48.000000000 +0000
+++ qtdeclarative-everywhere-src-5.12.6/src/qml/qml/v8/qv8engine.cpp 2020-08-09 17:28:54.028331206 +0000
@@ -138,14 +138,6 @@
, m_xmlHttpRequestData(nullptr)
#endif
{
-#ifndef Q_OS_WASM // wasm does not have working simd QTBUG-63924
-#ifdef Q_PROCESSOR_X86_32
- if (!qCpuHasFeature(SSE2)) {
- qFatal("This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer");
- }
-#endif
-#endif
-
QML_MEMORY_SCOPE_STRING("QV8Engine::QV8Engine");
qMetaTypeId<QJSValue>();
qMetaTypeId<QList<int> >();
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