ref: d9dce2f48eed1368a44c368fa87a506bd89ffec5
parent: 4d1540f8ce1c9965bc89674ba4e46e332f52599d
author: Johann <johannkoenig@google.com>
date: Fri Sep 2 07:29:20 EDT 2016
Restore vp8_sixtap_predict4x4_neon This function was removed when clang started introducing alignment hints which caused the 32 bit vld1_lane_u32/vst1_lane_u32 to fail: https://llvm.org/bugs/show_bug.cgi?id=24421 The load has been rendered safe with an implementation ~indiscernible performance-wise that uses _u8 and over-reads just a touch. The store, when unaligned, has a version that is ~25% slower but safe when xoffset = 0 (second pass filter only). When the first pass filter (or both) are in play, the new version is almost identical in speed. Worst case performance (both filters, unaligned stores) is roughly 3-4x faster than C. BUG=webm:817 BUG=webm:1273 Change-Id: I1e490e94453e0872151fe0dafb05557463f6247d