Index: cc/playback/raster_source.cc |
diff --git a/cc/playback/raster_source.cc b/cc/playback/raster_source.cc |
index f38f9dd08ff7c8dcdd74f8f239360860c9879aa0..c2fd7fcf9f8444a44f960d4feff5e3be9284edeb 100644 |
--- a/cc/playback/raster_source.cc |
+++ b/cc/playback/raster_source.cc |
@@ -5,6 +5,9 @@ |
#include "cc/playback/raster_source.h" |
#include <stddef.h> |
+#ifdef __SSE__ |
+#include <xmmintrin.h> |
+#endif |
#include "base/trace_event/trace_event.h" |
#include "cc/base/region.h" |
@@ -73,6 +76,12 @@ void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas, |
if (!canvas_playback_rect.IsEmpty() && |
!raster_bounds.intersect(gfx::RectToSkIRect(canvas_playback_rect))) |
return; |
+#ifdef __SSE__ |
+ // Turn on "subnormals are zero" and "flush to zero" CSR flags for |
+ // performance. |
+ unsigned int csr = _mm_getcsr(); |
+ _mm_setcsr(csr | 0x8040); |
+#endif |
piman
2016/07/25 20:28:40
This may be needed in more places - e.g. software
|
raster_canvas->save(); |
raster_canvas->translate(-canvas_bitmap_rect.x(), -canvas_bitmap_rect.y()); |
@@ -80,6 +89,9 @@ void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas, |
raster_canvas->scale(contents_scale, contents_scale); |
PlaybackToCanvas(raster_canvas, settings); |
raster_canvas->restore(); |
+#ifdef __SSE__ |
+ _mm_setcsr(csr); |
+#endif |
} |
void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas, |