tree 329c1d4403c3542757db63fb1fb230e74f78b0c1
parent 33c565f4766f961f4302c3e007a5ceaee312cc8c
author Rose, James <james.rose@intel.com> 1398139686 +0800
committer Xiaofei Wan <xiaofei.wan@intel.com> 1398139707 +0800

Improve RS intrinsics performance.

Renderscript CPU performance for intrinsics cases is not good for x86 platforms.
In many cases it is significantly slower even with SIMD Intrinsics. In current x86 implementation
it is using full 32 bit multiplies which aren't well supported on current Atom platforms.

This patch uses 16 bit multiply with 32 bit add pmaddwd instruction where appropriate.
It also adds atom specificoptimizations to improve RS intrinsics performance.

Change-Id: Ifc01b5a6d6f7430d2dc218f1618b9df3fb7937fe
Signed-off-by: Xiaofei Wan <xiaofei.wan@intel.com>