webkit: enable no-pic compiling option

This patch is to enable no-pic compiling option

PIC enables efficient code sharing between processes but increases overhead due
to
indirectly access global variables and functions. By enabling no-pic here,
we can get rid of indirect access calling __x86.get_pc_thunk.bx, while still
share
the library between processes, since zygote loads libwebcore, and all android
applications are forked from zygote and inherits its address space.

The patch takes effect together with the one enabling no-pic compiling option
in v8.
With them, we can see obvious performance improvement for browser workloads,
5%+ for HTML5-zoom and HTML5-animation, 6.6% for sunspider, and 9.1% for
pageloading

Note: This patch is related to a change in platform/external/v8

Change-Id: I47ee3149d31b2f7d78c4a399503b6d9a9f0f572a
Author: Lijuan Xiao<lijuan.xiao@intel.com>
Signed-off-by: Bin Xu <bxu10X@intel.com>
Singed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 26358

1 files changed, 4 insertions, 0 deletions

diff --git a/Android.mk b/Android.mk
index 61bd467..12fbb59 100644
--- a/Android.mk
+++ b/Android.mk
@@ -252,6 +252,10 @@ LOCAL_CFLAGS += -Darm
 LOCAL_CFLAGS += -Wno-psabi
 endif
 
+ifeq ($(TARGET_ARCH_VARIANT),x86-atom)
+LOCAL_CFLAGS += -fno-pic
+endif
+
 # need a flag to tell the C side when we're on devices with large memory
 # budgets (i.e. larger than the low-end devices that initially shipped)
 ifeq ($(ARCH_ARM_HAVE_VFP),true)