在 2013-10-12 03:12:46，"Steve Borho" <[email protected]> 写道：
On Fri, Oct 11, 2013 at 3:40 AM, <[email protected]> wrote:
# HG changeset patch
# User Yuvaraj Venkatesh <[email protected]>
# 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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