Title: [115523] trunk/Source/_javascript_Core
- Revision
- 115523
- Author
- [email protected]
- Date
- 2012-04-27 18:02:03 -0700 (Fri, 27 Apr 2012)
Log Message
<rdar://problem/7909395> Math in _javascript_ is inaccurate on iOS
By defalut IEEE754 denormal support is disabled on iOS;
turn it on.
Reviewed by Filip Pizlo.
* jsc.cpp:
(main):
- clear the appropriate bit in the fpscr.
Modified Paths
Diff
Modified: trunk/Source/_javascript_Core/ChangeLog (115522 => 115523)
--- trunk/Source/_javascript_Core/ChangeLog 2012-04-28 01:00:47 UTC (rev 115522)
+++ trunk/Source/_javascript_Core/ChangeLog 2012-04-28 01:02:03 UTC (rev 115523)
@@ -1,3 +1,16 @@
+2012-04-27 Gavin Barraclough <[email protected]>
+
+ <rdar://problem/7909395> Math in _javascript_ is inaccurate on iOS
+
+ By defalut IEEE754 denormal support is disabled on iOS;
+ turn it on.
+
+ Reviewed by Filip Pizlo.
+
+ * jsc.cpp:
+ (main):
+ - clear the appropriate bit in the fpscr.
+
2012-04-27 Michael Saboff <[email protected]>
Memory wasted in JSString for non-rope strings
Modified: trunk/Source/_javascript_Core/jsc.cpp (115522 => 115523)
--- trunk/Source/_javascript_Core/jsc.cpp 2012-04-28 01:00:47 UTC (rev 115522)
+++ trunk/Source/_javascript_Core/jsc.cpp 2012-04-28 01:02:03 UTC (rev 115523)
@@ -72,6 +72,11 @@
#include <QDateTime>
#endif
+#if PLATFORM(IOS)
+#include <fenv.h>
+#include <arm/arch.h>
+#endif
+
using namespace JSC;
using namespace WTF;
@@ -445,6 +450,14 @@
int main(int argc, char** argv)
{
+#if PLATFORM(IOS)
+ // Enabled IEEE754 denormal support.
+ fenv_t env;
+ fegetenv( &env );
+ env.__fpscr &= ~0x01000000u;
+ fesetenv( &env );
+#endif
+
#if OS(WINDOWS)
#if !OS(WINCE)
// Cygwin calls ::SetErrorMode(SEM_FAILCRITICALERRORS), which we will inherit. This is bad for
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