MIPS: Support recognition of the DSP ASE at run-time

Add detection of MIPS DSPr2 at run-time in qsimd.cpp. This makes it
possible to have generic Qt builds for MIPS that can enable the fast
code paths for processors with the DSP ASE at run-time. Also, this
makes it possible to manually disable them by setting the environment
variable "QT_NO_CPU_FEATURE=dspr2". Last, but not least, functions
requiring DSPr2 are not enabled when running in CPUs with version-1
DSP.

Change-Id: Ia5a01d84119553c22ab83386c74a6cb8ba5fee53
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

3 files changed, 25 insertions, 11 deletions

diff --git a/src/gui/image/qimage_conversions.cpp b/src/gui/image/qimage_conversions.cpp
index cf61d2d84b..11c4b6d504 100644
--- a/src/gui/image/qimage_conversions.cpp
+++ b/src/gui/image/qimage_conversions.cpp
@@ -2174,13 +2174,15 @@ void qInitImageConversions()
 #endif
 
 #ifdef QT_COMPILER_SUPPORTS_MIPS_DSPR2
-    extern bool convert_ARGB_to_ARGB_PM_inplace_mips_dspr2(QImageData *data, Qt::ImageConversionFlags);
-    inplace_converter_map[QImage::Format_ARGB32][QImage::Format_ARGB32_Premultiplied] = convert_ARGB_to_ARGB_PM_inplace_mips_dspr2;
-
-    extern void convert_RGB888_to_RGB32_mips_dspr2(QImageData *dest, const QImageData *src, Qt::ImageConversionFlags);
-    qimage_converter_map[QImage::Format::RGB888][QImage::Format_RGB32] = convert_RGB888_to_RGB32_mips_dspr2;
-    qimage_converter_map[QImage::Format::RGB888][QImage::Format_ARGB32] = convert_RGB888_to_RGB32_mips_dspr2;
-    qimage_converter_map[QImage::Format::RGB888][QImage::Format_ARGB32_Premultiplied] = convert_RGB888_to_RGB32_mips_dspr2;
+    if (qCpuHasFeature(DSPR2)) {
+        extern bool convert_ARGB_to_ARGB_PM_inplace_mips_dspr2(QImageData *data, Qt::ImageConversionFlags);
+        qimage_inplace_converter_map[QImage::Format_ARGB32][QImage::Format_ARGB32_Premultiplied] = convert_ARGB_to_ARGB_PM_inplace_mips_dspr2;
+
+        extern void convert_RGB888_to_RGB32_mips_dspr2(QImageData *dest, const QImageData *src, Qt::ImageConversionFlags);
+        qimage_converter_map[QImage::Format_RGB888][QImage::Format_RGB32] = convert_RGB888_to_RGB32_mips_dspr2;
+        qimage_converter_map[QImage::Format_RGB888][QImage::Format_ARGB32] = convert_RGB888_to_RGB32_mips_dspr2;
+        qimage_converter_map[QImage::Format_RGB888][QImage::Format_ARGB32_Premultiplied] = convert_RGB888_to_RGB32_mips_dspr2;
+    }
 #endif
 }
 
diff --git a/src/gui/image/qjpeghandler.cpp b/src/gui/image/qjpeghandler.cpp
index dfacf34097..c1d3ff9a85 100644
--- a/src/gui/image/qjpeghandler.cpp
+++ b/src/gui/image/qjpeghandler.cpp
@@ -876,7 +876,9 @@ QJpegHandler::QJpegHandler()
     }
 #endif // QT_COMPILER_SUPPORTS_SSSE3
 #if defined(QT_COMPILER_SUPPORTS_MIPS_DSPR2)
-    rgb888ToRgb32ConverterPtr = qt_convert_rgb888_to_rgb32_mips_dspr2_asm;
+    if (qCpuHasFeature(DSPR2)) {
+        rgb888ToRgb32ConverterPtr = qt_convert_rgb888_to_rgb32_mips_dspr2_asm;
+    }
 #endif // QT_COMPILER_SUPPORTS_DSPR2
 }
 
diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index b5ccafdf9a..2b40bf37e1 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -6651,10 +6651,13 @@ void qt_memfill16(quint16 *dest, quint16 color, int count)
 }
 #endif
 #if !defined(__SSE2__) && !defined(__ARM_NEON__)
+#  ifdef QT_COMPILER_SUPPORTS_MIPS_DSP
+extern "C" void qt_memfill32_asm_mips_dsp(quint32 *, quint32, int);
+#  endif
+
 void qt_memfill32(quint32 *dest, quint32 color, int count)
 {
 #  ifdef QT_COMPILER_SUPPORTS_MIPS_DSP
-    extern "C" qt_memfill32_asm_mips_dsp(quint32 *, quint32, int);
     qt_memfill32_asm_mips_dsp(dest, color, count);
 #  else
     qt_memfill_template<quint32>(dest, color, count);
@@ -6776,7 +6779,13 @@ void qInitDrawhelperAsm()
     qt_fetch_radial_gradient = qt_fetch_radial_gradient_neon;
 #endif
 
-#if defined(QT_COMPILER_SUPPORTS_MIPS_DSP)
+#ifdef Q_PROCESSOR_MIPS_32
+    qt_memfill32 = qt_memfill32_asm_mips_dsp;
+#endif // Q_PROCESSOR_MIPS_32
+
+#if defined(QT_COMPILER_SUPPORTS_MIPS_DSP) || defined(QT_COMPILER_SUPPORTS_MIPS_DSPR2)
+    if (features & (DSP | DSPR2)) {
+        // Composition functions are all DSP r1
         functionForMode_C[QPainter::CompositionMode_SourceOver] = comp_func_SourceOver_asm_mips_dsp;
         functionForMode_C[QPainter::CompositionMode_Source] = comp_func_Source_mips_dsp;
         functionForMode_C[QPainter::CompositionMode_DestinationOver] = comp_func_DestinationOver_mips_dsp;
@@ -6820,8 +6829,9 @@ void qInitDrawhelperAsm()
 #else
         qBlendFunctions[QImage::Format_RGB16][QImage::Format_RGB16] = qt_blend_rgb16_on_rgb16_mips_dsp;
 #endif // QT_COMPILER_SUPPORTS_MIPS_DSPR2
+    }
+#endif // QT_COMPILER_SUPPORTS_MIPS_DSP || QT_COMPILER_SUPPORTS_MIPS_DSPR2
 
-#endif // QT_COMPILER_SUPPORTS_MIPS_DSP
     if (functionForModeSolidAsm) {
         const int destinationMode = QPainter::CompositionMode_Destination;
         functionForModeSolidAsm[destinationMode] = functionForModeSolid_C[destinationMode];