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gstreamer/gst/deinterlace/x86/yadif.asm
Vivia Nikolaidou 536ff4776f deinterlace: Add yadif ASM optimisations 
Measured to be about 3.4x faster than C

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/621>
2020-06-16 12:53:25 +03:00

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;*****************************************************************************
;* x86-optimized functions for yadif filter
;* Copyright (C) 2020 Vivia Nikolaidou <vivia.nikolaidou@ltnglobal.com>
;*
;* Based on libav's vf_yadif.asm file
;* Copyright (C) 2006 Michael Niedermayer <michaelni@gmx.at>
;* Copyright (c) 2013 Daniel Kang <daniel.d.kang@gmail.com>
;*
;* This file is part of FFmpeg.
;*
;* FFmpeg is free software; you can redistribute it and/or
;* modify it under the terms of the GNU Lesser General Public
;* License as published by the Free Software Foundation; either
;* version 2.1 of the License, or (at your option) any later version.
;*
;* FFmpeg is distributed in the hope that it will be useful,
;* but WITHOUT ANY WARRANTY; without even the implied warranty of
;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;* Lesser General Public License for more details.
;*
;* You should have received a copy of the GNU Lesser General Public
;* License along with FFmpeg; if not, write to the Free Software
;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;******************************************************************************
%include "x86inc.asm"
SECTION_RODATA
; 16 bytes of value 1
pb_1: times 16 db 1
; 8 words of value 1
pw_1: times 8 dw 1
SECTION .text
%macro ABS1 2
%if cpuflag(ssse3)
pabsw %1, %1
%elif cpuflag(mmxext) ; a, tmp
pxor %2, %2
psubw %2, %1
pmaxsw %1, %2
%else ; a, tmp
pxor %2, %2
pcmpgtw %2, %1
pxor %1, %2
psubw %1, %2
%endif
%endmacro
%macro CHECK 2
; %1 = 1+j, %2 = 1-j
; m2 = t0[x+1+j]
movu m2, [tzeroq+%1]
; m3 = b0[x+1-j]
movu m3, [bzeroq+%2]
; m4 = t0[x+1+j]
mova m4, m2
; m5 = t0[x+1+j]
mova m5, m2
; m4 = xor(t0[x+1+j], b0[x+1-j]
pxor m4, m3
pavgb m5, m3
; round down to 0
pand m4, [pb_1]
; m5 = rounded down average of the whole thing
psubusb m5, m4
; shift by 1 quadword to prepare for spatial_pred
psrldq m5, 1
; m7 = 0
; Interleave low-order bytes with 0
; so one pixel doesn't spill into the next one
punpcklbw m5, m7
; m4 = t0[x+1+j] (reset)
mova m4, m2
; m2 = t0[x+1+j] - b0[x+1-j]
psubusb m2, m3
; m3 = -m2
psubusb m3, m4
; m2 = FFABS(t0[x+1+j] - b0[x+1-j]);
pmaxub m2, m3
; m3 = FFABS(t0[x+1+j] - b0[x+1-j]);
mova m3, m2
; m4 = FFABS(FFABS(t0[x+1+j] - b0[x+1-j]);
mova m4, m2
; m3 = FFABS(t0[x+j] - b0[x-j])
psrldq m3, 1
; m4 = FFABS(t0[x-1+j] - b0[x-1-j])
psrldq m4, 2
; prevent pixel spilling for all of them
punpcklbw m2, m7
punpcklbw m3, m7
punpcklbw m4, m7
paddw m2, m3
; m2 = score
paddw m2, m4
%endmacro
%macro CHECK1 0
; m0 was spatial_score
; m1 was spatial_pred
mova m3, m0
; compare for greater than
; each word will be 1111 or 0000
pcmpgtw m3, m2
; if (score < spatial_score) spatial_score = score;
pminsw m0, m2
; m6 = the mask
mova m6, m3
; m5 = becomes 0 if it should change
pand m5, m3
; nand: m3 = becomes 0 if it should not change
pandn m3, m1
; m3 = put them together in an OR
por m3, m5
; and put it in spatial_pred
mova m1, m3
%endmacro
%macro CHECK2 0
; m6 was the mask from CHECK1 (we don't change it)
paddw m6, [pw_1]
; shift words left while shifting in 14 0s (16 - j)
; essentially to not recalculate the mask!
psllw m6, 14
; add it to score
paddsw m2, m6
; same as CHECK1
mova m3, m0
pcmpgtw m3, m2
pminsw m0, m2
pand m5, m3
pandn m3, m1
por m3, m5
mova m1, m3
%endmacro
%macro LOAD 2
movh %1, %2
punpcklbw %1, m7
%endmacro
%macro FILTER_HEAD 0
; m7 = 0
pxor m7, m7
; m0 = c
LOAD m0, [tzeroq]
; m1 = e
LOAD m1, [bzeroq]
; m3 = mp
LOAD m3, [mpq]
; m2 = m1
LOAD m2, [moneq]
; m4 = mp
mova m4, m3
; m3 = m1 + mp
paddw m3, m2
; m3 = d
psraw m3, 1
; rsp + 0 = d
mova [rsp+ 0], m3
; m2 = m1 - mp
psubw m2, m4
; m2 = temporal_diff0 (m4 is temporary)
ABS1 m2, m4
; m3 = t2
LOAD m3, [ttwoq]
; m4 = b2
LOAD m4, [btwoq]
; m3 = t2 - c
psubw m3, m0
; m4 = b2 - e
psubw m4, m1
; m3 = ABS(t2 - c)
ABS1 m3, m5
; m4 = ABS(b2 - e)
ABS1 m4, m5
paddw m3, m4
psrlw m2, 1
; m3 = temporal_diff1
psrlw m3, 1
; m2 = left part of diff
pmaxsw m2, m3
; m3 = tp2
LOAD m3, [tptwoq]
; m4 = bp2
LOAD m4, [bptwoq]
psubw m3, m0
psubw m4, m1
ABS1 m3, m5
ABS1 m4, m5
paddw m3, m4
; m3 = temporal_diff2
psrlw m3, 1
; m2 = diff (for real)
pmaxsw m2, m3
; rsp + 16 = diff
mova [rsp+16], m2
; m1 = e + c
paddw m1, m0
; m0 = 2c
paddw m0, m0
; m0 = c - e
psubw m0, m1
; m1 = spatial_pred
psrlw m1, 1
; m0 = FFABS(c-e)
ABS1 m0, m2
; m2 = t0[x-1]
; if it's unpacked it should contain 4 bytes
movu m2, [tzeroq-1]
; m3 = b0[x-1]
movu m3, [bzeroq-1]
; m4 = t0[x-1]
mova m4, m2
; m2 = t0[x-1]-b0[x-1] unsigned packed
psubusb m2, m3
; m3 = m3 - m4 = b0[x-1]-t0[x-1] = -m2 unsigned packed
psubusb m3, m4
; m2 = max(m2, -m2) = abs(t0[x-1]-b0[x-1])
pmaxub m2, m3
%if mmsize == 16
; m3 = m2 >> 2quadwords
; pixel jump: go from x-1 to x+1
mova m3, m2
psrldq m3, 2
%else
pshufw m3, m2, q0021
%endif
; m7 = 0
; unpack and interleave low-order bytes
; to prevent pixel spilling when adding
punpcklbw m2, m7
punpcklbw m3, m7
paddw m0, m2
paddw m0, m3
; m0 = spatial_score
psubw m0, [pw_1]
CHECK -2, 0
CHECK1
CHECK -3, 1
CHECK2
CHECK 0, -2
CHECK1
CHECK 1, -3
CHECK2
; now m0 = spatial_score, m1 = spatial_pred
; m6 = diff
mova m6, [rsp+16]
%endmacro
%macro FILTER_TAIL 0
; m2 = d
mova m2, [rsp]
; m3 = d
mova m3, m2
; m2 = d - diff
psubw m2, m6
; m3 = d + diff
paddw m3, m6
; m1 = max(spatial_pred, d-diff)
pmaxsw m1, m2
; m1 = min(d + diff, max(spatial_pred, d-diff))
; m1 = spatial_pred
pminsw m1, m3
; Converts 8 signed word integers into 16 unsigned byte integers with saturation
packuswb m1, m1
; dst = spatial_pred
movh [dstq], m1
; half the register size
add dstq, mmsize/2
add tzeroq, mmsize/2
add bzeroq, mmsize/2
add moneq, mmsize/2
add mpq, mmsize/2
add ttwoq, mmsize/2
add btwoq, mmsize/2
add tptwoq, mmsize/2
add bptwoq, mmsize/2
add ttoneq, mmsize/2
add ttpq, mmsize/2
add bboneq, mmsize/2
add bbpq, mmsize/2
%endmacro
%macro FILTER_MODE0 0
.loop0:
FILTER_HEAD
; m2 = tt1
LOAD m2, [ttoneq]
; m4 = ttp
LOAD m4, [ttpq]
; m3 = bb1
LOAD m3, [bboneq]
; m5 = bbp
LOAD m5, [bbpq]
paddw m2, m4
paddw m3, m5
; m2 = b
psrlw m2, 1
; m3 = f
psrlw m3, 1
; m4 = c
LOAD m4, [tzeroq]
; m5 = d
mova m5, [rsp]
; m7 = e
LOAD m7, [bzeroq]
; m2 = b - c
psubw m2, m4
; m3 = f - e
psubw m3, m7
; m0 = d
mova m0, m5
; m5 = d - c
psubw m5, m4
; m0 = d - e
psubw m0, m7
; m4 = b - c
mova m4, m2
; m2 = FFMIN(b-c, f-e)
pminsw m2, m3
; m3 = FFMAX(f-e, b-c)
pmaxsw m3, m4
; m2 = FFMAX(d-c, FFMIN(b-c, f-e))
pmaxsw m2, m5
; m3 = FFMIN(d-c, FFMAX(f-e, b-c))
pminsw m3, m5
; m2 = max
pmaxsw m2, m0
; m3 = min
pminsw m3, m0
; m4 = 0
pxor m4, m4
; m6 = MAX(diff, min)
pmaxsw m6, m3
; m4 = -max
psubw m4, m2
; m6 = diff
pmaxsw m6, m4
FILTER_TAIL
; r13m = w
sub DWORD r13m, mmsize/2
jg .loop0
%endmacro
%macro FILTER_MODE2 0
.loop2:
FILTER_HEAD
FILTER_TAIL
; r13m = w
sub DWORD r13m, mmsize/2
jg .loop2
%endmacro
%macro YADIF_ADD3 0
; start 3 pixels later
add dstq, 3
add tzeroq, 3
add bzeroq, 3
add moneq, 3
add mpq, 3
add ttwoq, 3
add btwoq, 3
add tptwoq, 3
add bptwoq, 3
add ttoneq, 3
add ttpq, 3
add bboneq, 3
add bbpq, 3
%endmacro
; cglobal foo, 2,3,7,0x40, dst, src, tmp
; declares a function (foo) that automatically loads two arguments (dst and
; src) into registers, uses one additional register (tmp) plus 7 vector
; registers (m0-m6) and allocates 0x40 bytes of stack space.
%macro YADIF_MODE0 0
cglobal yadif_filter_line_mode0, 13, 14, 8, 80, dst, tzero, bzero, mone, mp, \
ttwo, btwo, tptwo, bptwo, ttone, \
ttp, bbone, bbp, w
YADIF_ADD3
FILTER_MODE0
RET
%endmacro
%macro YADIF_MODE2 0
cglobal yadif_filter_line_mode2, 13, 14, 8, 80, dst, tzero, bzero, mone, mp, \
ttwo, btwo, tptwo, bptwo, ttone, \
ttp, bbone, bbp, w
YADIF_ADD3
FILTER_MODE2
RET
%endmacro
; declares two functions for ssse3, and two for sse2
INIT_XMM ssse3
YADIF_MODE0
YADIF_MODE2
INIT_XMM sse2
YADIF_MODE0
YADIF_MODE2
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