[x265] [PATCH] intra: sse4 version of strong intra smoothing
chen
chenm003 at 163.com
Tue Nov 21 05:37:42 CET 2017
>diff -r a7c2f80c18af -r 973560d58dfb source/common/x86/intrapred8.asm
>--- a/source/common/x86/intrapred8.asm Mon Nov 20 14:31:22 2017 +0530
>+++ b/source/common/x86/intrapred8.asm Tue Nov 21 03:10:14 2017 +0800
>@@ -22313,11 +22313,144 @@
> mov [r1 + 64], r3b ; LeftLast
> RET
>
>-INIT_XMM sse4
>-cglobal intra_filter_32x32, 2,4,6
>- mov r2b, byte [r0 + 64] ; topLast
>- mov r3b, byte [r0 + 128] ; LeftLast
>-
>+; this function add strong intra filter
>+INIT_XMM sse4
>+cglobal intra_filter_32x32, 3,8,7
>+ xor r3d, r3d ; R9
>+ xor r4d, r4d ; R10
>+ mov r3b, byte [r0 + 64] ; topLast
>+ mov r4b, byte [r0 + 128] ; LeftLast
xor+mov = movzx, the xor (clear to zero) does not spending cycle, but affect instruction decode rate
>+
>+ ; strong intra filter is diabled
>+ cmp r2m, byte 0
>+ jz .normal_filter32
>+ ; decide to do strong intra filter
>+ xor r5d, r5d ; R11
>+ xor r6d, r6d ; RAX
>+ xor r7d, r7d ; RDI
>+ mov r5b, byte [r0] ; topLeft
>+ mov r6b, byte [r0 + 96] ; leftMiddle
>+ mov r7b, byte [r0 + 32] ; topMiddle
>+
>+ ; threshold = 8
>+ mov r2d, r3d ; R8
>+ add r2d, r5d ; (topLast + topLeft)
>+ shl r7d, 1 ; 2 * topMiddle
>+ sub r2d, r7d
(A+B) - 2 * C <==> (A-C) + (B-C)
>+ mov r7d, r2d ; backup r2d
>+ sar r7d, 31
>+ xor r2d, r7d
>+ sub r2d, r7d ; abs(r2d)
>+ cmp r2d, 8
; how about this or instruction cdq?
; abs(x-y)
mov eax, X
sub eax, Y
sub Y, X
cmovg eax, Y
>+ ; bilinearAbove is false
>+ jns .normal_filter32
>+
>+ mov r2d, r5d
>+ add r2d, r4d
>+ shl r6d, 1
>+ sub r2d, r6d
>+ mov r6d, r2d
>+ sar r6d, 31
>+ xor r2d, r6d
>+ sub r2d, r6d
>+ cmp r2d, 8
>+ ; bilinearLeft is false
>+ jns .normal_filter32
>+
>+ ; do strong intra filter shift = 6
>+ mov r2d, r5d
>+ shl r2d, 6
>+ add r2d, 32 ; init
>+ mov r6d, r4d
>+ sub r6w, r5w ; deltaL size is word
partial register may stall in here
>+ mov r7d, r3d
>+ sub r7w, r5w ; deltaR size is word
>+ movd xmm0, r2d
>+ vpbroadcastw xmm0, xmm0
SSE4?
>+ mova xmm4, xmm0
>+
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