[x265] Fwd: [PATCH] copy_cnt_4: faster AVX2 code

[Praveen Tiwari]

---------- Forwarded message ----------
From: chen <chenm003 at 163.com>
Date: Tue, Sep 9, 2014 at 10:17 AM
Subject: Re: [x265] [PATCH] copy_cnt_4: faster AVX2 code
To: Development for x265 <x265-devel at videolan.org>


>>Most operator is SSE2, just one movu, why we need AVX2 version on 4x4?
what about vinserti128 ?

At 2014-09-09 16:37:23,praveen at multicorewareinc.com wrote:
># HG changeset patch ># User Praveen Tiwari ># Date 1410251834 -19800
># Node ID d011073f35258cb2f0ad95db6038c2d9fb840b27 ># Parent
ebb84e9dbb0fa0e8c4c9304b2efd57f8ac3d0c05 >copy_cnt_4: faster AVX2 code >
>diff -r ebb84e9dbb0f -r d011073f3525 source/common/x86/blockcopy8.asm
>--- a/source/common/x86/blockcopy8.asm Tue Sep 09 11:36:58 2014 +0530
>+++ b/source/common/x86/blockcopy8.asm Tue Sep 09 14:07:14 2014 +0530
>@@ -3990,7 +3990,7 @@ > INIT_YMM avx2 > cglobal copy_cnt_4, 3,3,3
>     add         r2d, r2d >-    xorpd       xm2, xm2
>+    xorpd       m2,  m2 >  >     ; row 0 & 1 >     movq        xm0, [r1]
>@@ -4004,11 +4004,9 @@ >     vinserti128 m0, m0, xm1, 1
>     movu    [r0], m0 >  >-    vextractf128 xm1, m0, 1
>-    packsswb     xm0, xm1 >-    pcmpeqb      xm0, xm2 >-
>     ; get count >+    packsswb    xm0, xm1 >+    pcmpeqb     xm0, xm2
>     pmovmskb    eax, xm0 >     not         ax >     popcnt      ax, ax
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