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;*****************************************************************************
;* x86-optimized functions for gblur filter
;*
;* 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 "libavutil/x86/x86util.asm"
SECTION .text
; void ff_horiz_slice_sse4(float *ptr, int width, int height, int steps,
; float nu, float bscale)
%macro HORIZ_SLICE 0
%if UNIX64
cglobal horiz_slice, 4, 9, 9, ptr, width, height, steps, x, y, step, stride, remain
%else
cglobal horiz_slice, 4, 9, 9, ptr, width, height, steps, nu, bscale, x, y, step, stride, remain
%endif
%if WIN64
movss m0, num
movss m1, bscalem
DEFINE_ARGS ptr, width, height, steps, x, y, step, stride, remain
%endif
movsxdifnidn widthq, widthd
mulss m2, m0, m0 ; nu ^ 2
mulss m3, m2, m0 ; nu ^ 3
mulss m4, m3, m0 ; nu ^ 4
xor xq, xq
xor yd, yd
mov strideq, widthq
; stride = width * 4
shl strideq, 2
; w = w - ((w - 1) & 3)
mov remainq, widthq
sub remainq, 1
and remainq, 3
sub widthq, remainq
shufps m0, m0, 0
shufps m2, m2, 0
shufps m3, m3, 0
shufps m4, m4, 0
.loop_y:
xor stepd, stepd
.loop_step:
; p0 *= bscale
mulss m5, m1, [ptrq + xq * 4]
movss [ptrq + xq * 4], m5
inc xq
; filter rightwards
; Here we are vectorizing the c version by 4
; for (x = 1; x < width; x++)
; ptr[x] += nu * ptr[x - 1];
; let p0 stands for ptr[x-1], the data from last loop
; and [p1,p2,p3,p4] be the vector data for this loop.
; Unrolling the loop, we get:
; p1' = p1 + p0*nu
; p2' = p2 + p1*nu + p0*nu^2
; p3' = p3 + p2*nu + p1*nu^2 + p0*nu^3
; p4' = p4 + p3*nu + p2*nu^2 + p1*nu^3 + p0*nu^4
; so we can do it in simd:
; [p1',p2',p3',p4'] = [p1,p2,p3,p4] + [p0,p1,p2,p3]*nu +
; [0,p0,p1,p2]*nu^2 + [0,0,p0,p1]*nu^3 +
; [0,0,0,p0]*nu^4
.loop_x:
movu m6, [ptrq + xq * 4] ; s = [p1,p2,p3,p4]
pslldq m7, m6, 4 ; [0, p1,p2,p3]
movss m7, m5 ; [p0,p1,p2,p3]
FMULADD_PS m6, m7, m0, m6, m8 ; s += [p0,p1,p2,p3] * nu
pslldq m7, 4 ; [0,p0,p1,p2]
FMULADD_PS m6, m7, m2, m6, m8 ; s += [0,p0,p1,p2] * nu^2
pslldq m7, 4
FMULADD_PS m6, m7, m3, m6, m8 ; s += [0,0,p0,p1] * nu^3
pslldq m7, 4
FMULADD_PS m6, m7, m4, m6, m8 ; s += [0,0,0,p0] * nu^4
movu [ptrq + xq * 4], m6
shufps m5, m6, m6, q3333
add xq, 4
cmp xq, widthq
jl .loop_x
add widthq, remainq
cmp xq, widthq
jge .end_scalar
.loop_scalar:
; ptr[x] += nu * ptr[x-1]
movss m5, [ptrq + 4*xq - 4]
mulss m5, m0
addss m5, [ptrq + 4*xq]
movss [ptrq + 4*xq], m5
inc xq
cmp xq, widthq
jl .loop_scalar
.end_scalar:
; ptr[width - 1] *= bscale
dec xq
mulss m5, m1, [ptrq + 4*xq]
movss [ptrq + 4*xq], m5
shufps m5, m5, 0
; filter leftwards
; for (; x > 0; x--)
; ptr[x - 1] += nu * ptr[x];
; The idea here is basically the same as filter rightwards.
; But we need to take care as the data layout is different.
; Let p0 stands for the ptr[x], which is the data from last loop.
; The way we do it in simd as below:
; [p-4', p-3', p-2', p-1'] = [p-4, p-3, p-2, p-1]
; + [p-3, p-2, p-1, p0] * nu
; + [p-2, p-1, p0, 0] * nu^2
; + [p-1, p0, 0, 0] * nu^3
; + [p0, 0, 0, 0] * nu^4
.loop_x_back:
sub xq, 4
movu m6, [ptrq + xq * 4] ; s = [p-4, p-3, p-2, p-1]
psrldq m7, m6, 4 ; [p-3, p-2, p-1, 0 ]
blendps m7, m5, 0x8 ; [p-3, p-2, p-1, p0 ]
FMULADD_PS m6, m7, m0, m6, m8 ; s+= [p-3, p-2, p-1, p0 ] * nu
psrldq m7, 4 ;
FMULADD_PS m6, m7, m2, m6, m8 ; s+= [p-2, p-1, p0, 0] * nu^2
psrldq m7, 4
FMULADD_PS m6, m7, m3, m6, m8 ; s+= [p-1, p0, 0, 0] * nu^3
psrldq m7, 4
FMULADD_PS m6, m7, m4, m6, m8 ; s+= [p0, 0, 0, 0] * nu^4
movu [ptrq + xq * 4], m6
shufps m5, m6, m6, 0 ; m5 = [p-4', p-4', p-4', p-4']
cmp xq, remainq
jg .loop_x_back
cmp xq, 0
jle .end_scalar_back
.loop_scalar_back:
; ptr[x-1] += nu * ptr[x]
movss m5, [ptrq + 4*xq]
mulss m5, m0
addss m5, [ptrq + 4*xq - 4]
movss [ptrq + 4*xq - 4], m5
dec xq
cmp xq, 0
jg .loop_scalar_back
.end_scalar_back:
; reset aligned width for next line
sub widthq, remainq
inc stepd
cmp stepd, stepsd
jl .loop_step
add ptrq, strideq
inc yd
cmp yd, heightd
jl .loop_y
RET
%endmacro
%if ARCH_X86_64
INIT_XMM sse4
HORIZ_SLICE
INIT_XMM avx2
HORIZ_SLICE
%endif
%macro POSTSCALE_SLICE 0
cglobal postscale_slice, 2, 2, 4, ptr, length, postscale, min, max
shl lengthd, 2
add ptrq, lengthq
neg lengthq
%if ARCH_X86_32
VBROADCASTSS m0, postscalem
VBROADCASTSS m1, minm
VBROADCASTSS m2, maxm
%elif WIN64
SWAP 0, 2
SWAP 1, 3
VBROADCASTSS m0, xm0
VBROADCASTSS m1, xm1
VBROADCASTSS m2, maxm
%else ; UNIX64
VBROADCASTSS m0, xm0
VBROADCASTSS m1, xm1
VBROADCASTSS m2, xm3
%endif
.loop:
%if cpuflag(avx2)
mulps m3, m0, [ptrq + lengthq]
%else
movu m3, [ptrq + lengthq]
mulps m3, m0
%endif
maxps m3, m1
minps m3, m2
movu [ptrq+lengthq], m3
add lengthq, mmsize
jl .loop
RET
%endmacro
INIT_XMM sse
POSTSCALE_SLICE
%if HAVE_AVX2_EXTERNAL
INIT_YMM avx2
POSTSCALE_SLICE
%endif
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