Title: [129730] trunk/Source/WTF
- Revision
- 129730
- Author
- [email protected]
- Date
- 2012-09-27 00:01:07 -0700 (Thu, 27 Sep 2012)
Log Message
[BlackBerry] Allow denormal floats in ARM VFP
https://bugs.webkit.org/show_bug.cgi?id=97008
Patch by Cosmin Truta <[email protected]> on 2012-09-26
Reviewed by Filip Pizlo.
Reviewed internally by Yong Li.
Cleared the Flush-to-Zero flag in the ARM FPSCR register on QNX.
* wtf/ThreadingPthreads.cpp:
(WTF::enableIEEE754Denormal): Added.
(WTF::initializeThreading):
(WTF::initializeCurrentThreadInternal):
Modified Paths
Diff
Modified: trunk/Source/WTF/ChangeLog (129729 => 129730)
--- trunk/Source/WTF/ChangeLog 2012-09-27 06:43:17 UTC (rev 129729)
+++ trunk/Source/WTF/ChangeLog 2012-09-27 07:01:07 UTC (rev 129730)
@@ -1,3 +1,18 @@
+2012-09-26 Cosmin Truta <[email protected]>
+
+ [BlackBerry] Allow denormal floats in ARM VFP
+ https://bugs.webkit.org/show_bug.cgi?id=97008
+
+ Reviewed by Filip Pizlo.
+ Reviewed internally by Yong Li.
+
+ Cleared the Flush-to-Zero flag in the ARM FPSCR register on QNX.
+
+ * wtf/ThreadingPthreads.cpp:
+ (WTF::enableIEEE754Denormal): Added.
+ (WTF::initializeThreading):
+ (WTF::initializeCurrentThreadInternal):
+
2012-09-26 Michael Saboff <[email protected]>
Update ComplexTextController for 8 bit TextRun changes
Modified: trunk/Source/WTF/wtf/ThreadingPthreads.cpp (129729 => 129730)
--- trunk/Source/WTF/wtf/ThreadingPthreads.cpp 2012-09-27 06:43:17 UTC (rev 129729)
+++ trunk/Source/WTF/wtf/ThreadingPthreads.cpp 2012-09-27 07:01:07 UTC (rev 129730)
@@ -110,11 +110,26 @@
return mutex;
}
+#if OS(QNX) && CPU(ARM_THUMB2)
+static void enableIEEE754Denormal()
+{
+ // Clear the ARM_VFP_FPSCR_FZ flag in FPSCR.
+ unsigned fpscr;
+ asm volatile("vmrs %0, fpscr" : "=r"(fpscr));
+ fpscr &= ~0x01000000u;
+ asm volatile("vmsr fpscr, %0" : : "r"(fpscr));
+}
+#endif
+
void initializeThreading()
{
if (atomicallyInitializedStaticMutex)
return;
+#if OS(QNX) && CPU(ARM_THUMB2)
+ enableIEEE754Denormal();
+#endif
+
WTF::double_conversion::initialize();
// StringImpl::empty() does not construct its static string in a threadsafe fashion,
// so ensure it has been initialized from here.
@@ -212,6 +227,10 @@
objc_registerThreadWithCollector();
#endif
+#if OS(QNX) && CPU(ARM_THUMB2)
+ enableIEEE754Denormal();
+#endif
+
ThreadIdentifier id = identifierByPthreadHandle(pthread_self());
ASSERT(id);
ThreadIdentifierData::initialize(id);
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