[x265] [PATCH] dct: Replaced partialButterfly16 vector class function to intrinsic

[chen]

在 2013-10-12 03:12:46，"Steve Borho" <steve at borho.org> 写道：






On Fri, Oct 11, 2013 at 3:40 AM, <yuvaraj at multicorewareinc.com> wrote:
# HG changeset patch
# User Yuvaraj Venkatesh <yuvaraj at multicorewareinc.com>
# Date 1381480768 -19800
#      Fri Oct 11 14:09:28 2013 +0530
# Node ID 46b954edb1c52a557b9d94c4ed380ea0578c1949
# Parent  8bb743458331d7cdc1008e217542e406818c5a7a
dct: Replaced partialButterfly16 vector class function to intrinsic



For some reason, this new version is 3x slower than the vector version; we need to figure out why.  It looks like the code-flow is the same.
 
are you use VS compiler? the instruction _mm_setr_epi32 is very slow on it, most time vector version make constant array.
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