From ca1ac7634f00b845ded92b5fabfa0d1c53197b01 Mon Sep 17 00:00:00 2001
From: Peter Varga <pvarga@inf.u-szeged.hu>
Date: Tue, 25 Jun 2013 15:53:03 +0200
Subject: [V8] Fix stack alignment corruption for MinGW32 build

BUG: https://bugreports.qt-project.org/browse/QTBUG-31396

Change-Id: If9b236f24ed82f4b6b19a2af938b422c68e5eab8
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
(cherry picked from commit 91f936a862644c7ca7a1762ad05cc91d263b808e)
Reviewed-by: Peter Varga <pvarga@inf.u-szeged.hu>
Reviewed-by: Liang Qi <liang.qi@digia.com>
---
 src/3rdparty/v8/src/platform-win32.cc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/3rdparty/v8/src/platform-win32.cc b/src/3rdparty/v8/src/platform-win32.cc
index 76e35f5..ae9ab2a 100644
--- a/src/3rdparty/v8/src/platform-win32.cc
+++ b/src/3rdparty/v8/src/platform-win32.cc
@@ -1523,9 +1523,12 @@ double OS::nan_value() {
 int OS::ActivationFrameAlignment() {
 #ifdef _WIN64
   return 16;  // Windows 64-bit ABI requires the stack to be 16-byte aligned.
-#else
-  return 8;  // Floating-point math runs faster with 8-byte alignment.
+#elif defined(__MINGW32__)
+  // With gcc 4.4 the tree vectorization optimizer can generate code
+  // that requires 16 byte alignment such as movdqa on x86.
+  return 16;
 #endif
+  return 8;  // Floating-point math runs faster with 8-byte alignment.
 }
 
 
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