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# Pure Data Packet mmx routine.
# Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
#
# TODO MOVE TO DIRECT FORM II
# y[k] = b0 * x[k] + u1[k-1]
# u1[k] = b1 * x[k] + u2[k-1] - a1 * y[k]
# u2[k] = b2 * x[k] - a2 * y[k]
# input in register:
# %mm0-mm3: input 4x4 pixels {x0 x1 x2 x3}
# %esi: coef memory (a1, a2, b0, b1, b2)
# %edi: state memory (u1, u2)
# return in register:
# %mm0-mm4: 4x4 pixels result
.biquad_4x4_pixels:
.align 16
# prescale
movq -8(%esi), %mm4
pmulhw %mm4, %mm0
pmulhw %mm4, %mm1
pmulhw %mm4, %mm2
pmulhw %mm4, %mm3
psllw $1, %mm0
psllw $1, %mm1
psllw $1, %mm2
psllw $1, %mm3
# first vector
movq 0(%edi), %mm4 # mm4 <- u[-1]
movq 8(%edi), %mm5 # mm5 <- u[-2]
movq %mm4, %mm6
movq %mm5, %mm7
pmulhw 0(%esi), %mm6 # multiply by a1
pmulhw 8(%esi), %mm7 # multiply by a2
paddsw %mm6, %mm0 # accumulate
paddsw %mm7, %mm0 # accumulate
paddsw %mm0, %mm0 # scale by 2 (since all fixed point muls are x*y/2)
movq %mm0, %mm6 # mm6 <- u[0]
movq %mm4, %mm7 # mm7 <- u[-1]
pmulhw 16(%esi), %mm0 # multiply by b0
pmulhw 24(%esi), %mm4 # multiply by b1
pmulhw 32(%esi), %mm5 # multiply by b2
paddsw %mm4, %mm0 # accumulate
paddsw %mm5, %mm0 # accumulate
# mm0 is result 0
# second vector
movq %mm6, %mm4 # mm4 <- u[0]
movq %mm7, %mm5 # mm5 <- u[-1]
pmulhw 0(%esi), %mm6 # multiply by a1
pmulhw 8(%esi), %mm7 # multiply by a2
paddsw %mm6, %mm1 # accumulate
paddsw %mm7, %mm1 # accumulate
paddsw %mm1, %mm1 # scale by 2
movq %mm1, %mm6 # mm6 <- u[1]
movq %mm4, %mm7 # mm7 <- u[0]
pmulhw 16(%esi), %mm1 # multiply by b0
pmulhw 24(%esi), %mm4 # multiply by b1
pmulhw 32(%esi), %mm5 # multiply by b2
paddsw %mm4, %mm1 # accumulate
paddsw %mm5, %mm1 # accumulate
# mm1 is result 1
# third vector
movq %mm6, %mm4 # mm4 <- u[1]
movq %mm7, %mm5 # mm5 <- u[0]
pmulhw 0(%esi), %mm6 # multiply by a1
pmulhw 8(%esi), %mm7 # multiply by a2
paddsw %mm6, %mm2 # accumulate
paddsw %mm7, %mm2 # accumulate
paddsw %mm2, %mm2 # scale by 2
movq %mm2, %mm6 # mm6 <- u[2]
movq %mm4, %mm7 # mm7 <- u[1]
pmulhw 16(%esi), %mm2 # multiply by b0
pmulhw 24(%esi), %mm4 # multiply by b1
pmulhw 32(%esi), %mm5 # multiply by b2
paddsw %mm4, %mm2 # accumulate
paddsw %mm5, %mm2 # accumulate
# mm2 is result 2
# fourth vector
movq %mm6, %mm4 # mm4 <- u[2]
movq %mm7, %mm5 # mm5 <- u[1]
pmulhw 0(%esi), %mm6 # multiply by a1
pmulhw 8(%esi), %mm7 # multiply by a2
paddsw %mm6, %mm3 # accumulate
paddsw %mm7, %mm3 # accumulate
paddsw %mm3, %mm3 # scale by 2
movq %mm3, 0(%edi) # store u[3]
movq %mm4, 8(%edi) # store u[2]
pmulhw 16(%esi), %mm3 # multiply by b0
pmulhw 24(%esi), %mm4 # multiply by b1
pmulhw 32(%esi), %mm5 # multiply by b2
paddsw %mm4, %mm3 # accumulate
paddsw %mm5, %mm3 # accumulate
# mm3 is result 3
ret
# in order to use the 4 line parallel biquad routine on horizontal
# lines, we need to reorder (rotate or transpose) the matrix, since
# images are scanline encoded, and we want to work in parallell
# on 4 lines.
#
# since the 4 lines are independent, it doesnt matter in which order
# the the vector elements are present.
#
# this allows us to use the same routine for left->right and right->left
# processing.
#
# some comments on the non-abelean group of square isometries consisting of
# (I) identity
# (H) horizontal axis mirror
# (V) vertical axis mirror
# (T) transpose (diagonal axis mirror)
# (A) antitranspose (antidiagonal axis mirror)
# (R1) 90deg anticlockwize rotation
# (R2) 180deg rotation
# (R3) 90deg clockwize rotation
#
#
# we basicly have two options: (R1,R3) or (T,A)
# we opt for T and A because they are self inverting, which improves locality
#
# use antitranspose for right to left an transpose
# for left to right (little endian)
# antitranspose 4x4
# input
# %mm3 == {d0 d1 d2 d3}
# %mm2 == {c0 c1 c2 c3}
# %mm1 == {b0 b1 b2 b3}
# %mm0 == {a0 a1 a2 a3}
# output
# %mm3 == {a3 b3 c3 d3}
# %mm2 == {a2 b2 c2 d2}
# %mm1 == {a1 b1 c1 d1}
# %mm0 == {a0 b0 c0 d0}
.antitranspose_4x4:
.align 16
movq %mm3, %mm4
punpcklwd %mm1, %mm4 # mm4 <- {b2 d2 b3 d3}
movq %mm3, %mm5
punpckhwd %mm1, %mm5 # mm5 <- {b0 d0 b1 d1}
movq %mm2, %mm6
punpcklwd %mm0, %mm6 # mm6 <- {a2 c2 a3 c3}
movq %mm2, %mm7
punpckhwd %mm0, %mm7 # mm7 <- {a0 c0 a1 c1}
movq %mm4, %mm3
punpcklwd %mm6, %mm3 # mm3 <- {a3 b3 c3 d3}
movq %mm4, %mm2
punpckhwd %mm6, %mm2 # mm2 <- {a2 b2 c2 d2}
movq %mm5, %mm1
punpcklwd %mm7, %mm1 # mm1 <- {a1 b1 c1 d1}
movq %mm5, %mm0
punpckhwd %mm7, %mm0 # mm0 <- {a0 b0 c0 d0}
ret
# transpose 4x4
# input
# %mm3 == {d3 d2 d1 d0}
# %mm2 == {c3 c2 c1 c0}
# %mm1 == {b3 b2 b1 b0}
# %mm0 == {a3 a2 a1 a0}
# output
# %mm3 == {d3 c3 b3 a3}
# %mm2 == {d2 c2 b2 a2}
# %mm1 == {d1 c1 b1 a1}
# %mm0 == {d0 c0 b0 a0}
.transpose_4x4:
.align 16
movq %mm0, %mm4
punpcklwd %mm2, %mm4 # mm4 <- {c1 a1 c0 a0}
movq %mm0, %mm5
punpckhwd %mm2, %mm5 # mm5 <- {c3 a3 c2 a2}
movq %mm1, %mm6
punpcklwd %mm3, %mm6 # mm6 <- {d1 b1 d0 b0}
movq %mm1, %mm7
punpckhwd %mm3, %mm7 # mm7 <- {d3 b3 d2 b2}
movq %mm4, %mm0
punpcklwd %mm6, %mm0 # mm0 <- {d0 c0 b0 a0}
movq %mm4, %mm1
punpckhwd %mm6, %mm1 # mm1 <- {d1 c1 b1 a1}
movq %mm5, %mm2
punpcklwd %mm7, %mm2 # mm2 <- {d2 c2 b2 a2}
movq %mm5, %mm3
punpckhwd %mm7, %mm3 # mm3 <- {d3 c3 b3 a3}
ret
.globl pixel_biquad_vertb_s16
.type pixel_biquad_vertb_s16,@function
# pixel_biquad_vertbr_s16(char *pixel_array, int nb_rows, int linewidth, short int coef[20], short int state[8])
pixel_biquad_vertb_s16:
pushl %ebp
movl %esp, %ebp
push %ebx
push %esi
push %edi
movl 8(%ebp), %ebx # pixel array offset
movl 12(%ebp), %ecx # nb of 4x4 pixblocks
movl 16(%ebp), %edx # line with
movl 20(%ebp), %esi # coefs
movl 24(%ebp), %edi # state
shll $1, %edx # short int addressing
movl %edx, %eax
shll $1, %eax
addl %edx, %eax # eax = 3 * edx
.align 16
.biquad_vertb_line_loop:
movq (%ebx), %mm0
movq (%ebx,%edx,1), %mm1
movq (%ebx,%edx,2), %mm2
movq (%ebx,%eax,1), %mm3
call .biquad_4x4_pixels
movq %mm0, (%ebx)
movq %mm1, (%ebx,%edx,1)
movq %mm2, (%ebx,%edx,2)
movq %mm3, (%ebx,%eax,1)
addl %edx, %ebx
addl %eax, %ebx
decl %ecx
jnz .biquad_vertb_line_loop
emms
pop %edi
pop %esi
pop %ebx
leave
ret
.globl pixel_biquad_horlr_s16
.type pixel_biquad_horlr_s16,@function
# pixel_biquad_hor_s16(char *pixel_array, int nb_rows, int linewidth, short int coef[20], short int state[8])
pixel_biquad_horlr_s16:
pushl %ebp
movl %esp, %ebp
push %ebx
push %esi
push %edi
movl 8(%ebp), %ebx # pixel array offset
movl 12(%ebp), %ecx # nb of 4x4 pixblocks
movl 16(%ebp), %edx # line with
movl 20(%ebp), %esi # coefs
movl 24(%ebp), %edi # state
shll $1, %edx # short int addressing
movl %edx, %eax
shll $1, %eax
addl %edx, %eax # eax = 3 * edx
.align 16
.biquad_horlr_line_loop:
movq (%ebx), %mm0
movq (%ebx,%edx,1), %mm1
movq (%ebx,%edx,2), %mm2
movq (%ebx,%eax,1), %mm3
call .transpose_4x4
call .biquad_4x4_pixels
call .transpose_4x4
movq %mm0, (%ebx)
movq %mm1, (%ebx,%edx,1)
movq %mm2, (%ebx,%edx,2)
movq %mm3, (%ebx,%eax,1)
addl $8, %ebx
decl %ecx
jnz .biquad_horlr_line_loop
emms
pop %edi
pop %esi
pop %ebx
leave
ret
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