Changeset 115523 in webkit for trunk/Source/JavaScriptCore/jsc.cpp

Timestamp:

Apr 27, 2012, 6:02:03 PM (13 years ago)

Author:

[email protected]

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.

File:

• trunk/Source/JavaScriptCore/jsc.cpp (modified) (2 diffs)

trunk/Source/JavaScriptCore/jsc.cpp

@@ -73 +73 @@
 #endif
 
+#if PLATFORM(IOS)
+#include <fenv.h>
+#include <arm/arch.h>
+#endif
+
 using namespace JSC;
 using namespace WTF;
@@ -446 +451 @@
 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)