diff -up webkitgtk-2.0.4/Source/JavaScriptCore/heap/CopiedBlock.h.ppc64_align webkitgtk-2.0.4/Source/JavaScriptCore/heap/CopiedBlock.h

--- webkitgtk-2.0.4/Source/JavaScriptCore/heap/CopiedBlock.h.ppc64_align	2014-05-07 11:13:48.249690429 +0200

+++ webkitgtk-2.0.4/Source/JavaScriptCore/heap/CopiedBlock.h	2014-05-07 11:14:02.442872375 +0200

@@ -77,7 +77,7 @@ public:

     size_t size();

     size_t capacity();

-    static const size_t blockSize = 32 * KB;

+    static const size_t blockSize = 64 * KB;

     bool hasWorkList();

     CopyWorkList& workList();

diff -up webkitgtk-2.0.4/Source/JavaScriptCore/interpreter/JSStack.cpp.ppc64_align webkitgtk-2.0.4/Source/JavaScriptCore/interpreter/JSStack.cpp

--- webkitgtk-2.0.4/Source/JavaScriptCore/interpreter/JSStack.cpp.ppc64_align	2014-05-07 11:14:17.785069040 +0200

+++ webkitgtk-2.0.4/Source/JavaScriptCore/interpreter/JSStack.cpp	2014-05-07 11:15:15.610810268 +0200

@@ -49,7 +49,8 @@ JSStack::JSStack(JSGlobalData& globalDat

 {

     ASSERT(capacity && isPageAligned(capacity));

-    m_reservation = PageReservation::reserve(roundUpAllocationSize(capacity * sizeof(Register), commitSize), OSAllocator::JSVMStackPages);

+    size_t commitsize = pageSize();

+    m_reservation = PageReservation::reserve(roundUpAllocationSize(capacity * sizeof(Register), commitsize), OSAllocator::JSVMStackPages);

     m_end = static_cast<Register*>(m_reservation.base());

     m_commitEnd = static_cast<Register*>(m_reservation.base());

@@ -78,7 +79,8 @@ bool JSStack::growSlowCase(Register* new

     // Compute the chunk size of additional memory to commit, and see if we

     // have it is still within our budget. If not, we'll fail to grow and

     // return false.

-    long delta = roundUpAllocationSize(reinterpret_cast<char*>(newEnd) - reinterpret_cast<char*>(m_commitEnd), commitSize);

+    size_t commitsize = pageSize();

+    long delta = roundUpAllocationSize(reinterpret_cast<char*>(newEnd) - reinterpret_cast<char*>(m_commitEnd), commitsize);

     if (reinterpret_cast<char*>(m_commitEnd) + delta > reinterpret_cast<char*>(m_useableEnd))

         return false;

@@ -134,7 +136,8 @@ void JSStack::enableErrorStackReserve()

 void JSStack::disableErrorStackReserve()

 {

-    char* useableEnd = reinterpret_cast<char*>(reservationEnd()) - commitSize;

+    size_t commitsize = pageSize();

+    char* useableEnd = reinterpret_cast<char*>(reservationEnd()) - commitsize;

     m_useableEnd = reinterpret_cast<Register*>(useableEnd);

     // By the time we get here, we are guaranteed to be destructing the last