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|
;
; SIMD for computing the residual
; Copyright 2018 Anton Khirnov <anton@khirnov.net>
;
; 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 3 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, see <http://www.gnu.org/licenses/>.
;/
%include "config.asm"
%include "x86inc.asm"
; double precision
%define ELEM_SIZE 8
; offsets to FD coefficients for given derivative
%define OFF_DIFF_COEFF_00 0 * gprsize
%define OFF_DIFF_COEFF_01 1 * gprsize
%define OFF_DIFF_COEFF_10 2 * gprsize
%define OFF_DIFF_COEFF_11 3 * gprsize
%define OFF_DIFF_COEFF_02 4 * gprsize
%define OFF_DIFF_COEFF_20 5 * gprsize
SECTION .rodata
const8: times 8 dq 8.0
const30: times 8 dq 30.0
SECTION .text
; mm register allocation (both s1 and s2)
; m0: accumulator for the residual
; m6-m11: working registers
; m12: max(fabs(residual))
; m13: mask for computing absolute values
; (s2 only) m14-m15: splatted constants 8.0, 30.0
; calculate and add residual contributions from first and second derivatives
; along a single direction (x or y)
;
; parameters:
; %1: stencil
; %2: 0 -- x; 1 -- y
;
; register use (in addition to register allocation described above):
; m6: on entry contains u[x] multiplied by the corresponding FD coefficient, not
; clobbered
; m7-m11 used for work (clobbered)
%macro RES_ADD_DIFF_SINGLEDIR 2
%define stencil %1
%if %2 == 0
%define up1q uq + ELEM_SIZE
%define up2q uq + ELEM_SIZE * 2
%define um1q uq - ELEM_SIZE
%define um2q uq - ELEM_SIZE * 2
%define coeffs1q diff_coeffs10q
%define coeffs2q diff_coeffs20q
%else
%define up1q u_upq
%define up2q u_up2q
%define um1q u_downq
%define um2q u_down2q
%define coeffs1q diff_coeffs01q
%define coeffs2q diff_coeffs02q
%endif
; load the function values
movu m7, [up1q + offsetq] ; m7 = u[x+1]
movu m9, [um1q + offsetq] ; m9 = u[x-1]
%if stencil == 2
movu m8, [up2q + offsetq] ; m8 = u[x+2]
movu m10, [um2q + offsetq] ; m10 = u[x-2]
%endif
; first derivative
subpd m11, m7, m9 ; m11 = u[x+1] - u[x-1]
%if stencil == 2
mulpd m11, m14 ; m11 *= 8
subpd m11, m8 ; m11 -= u[x+2]
addpd m11, m10 ; m11 += u[x-2]
%endif
vfmadd231pd m0, m11, [coeffs1q + offsetq] ; res += d_x u * diff_coeffs10
; second derivative
addpd m11, m7, m9 ; m11 = u[x+1] + u[x-1]
%if stencil == 2
mulpd m11, m14
addpd m11, m11 ; m11 *= 16
subpd m11, m8 ; m11 -= u[x+2]
subpd m11, m10 ; m11 -= u[x-2]
%endif
subpd m11, m6 ; m11 -= fd0 u[x]
vfmadd231pd m0, m11, [coeffs2q + offsetq] ; res += d_xx u * diff_coeffs20
%endmacro
; calculate and add residual contributions from the second mixed derivative
;
; parameters:
; %1: stencil
;
; register use (in addition to register allocation described above):
; m6, m7: used for work (clobbered)
%macro RES_ADD_DIFF_MIXED 1
movu m6, [u_upq + 1 * ELEM_SIZE + offsetq] ; m6 = u[y+1, x+1]
subpd m6, [u_upq - 1 * ELEM_SIZE + offsetq] ; - u[y+1, x-1]
subpd m6, [u_downq + 1 * ELEM_SIZE + offsetq] ; - u[y-1, x+1]
addpd m6, [u_downq - 1 * ELEM_SIZE + offsetq] ; + u[y-1, x-1]
%if %1 == 2
movu m7, [u_up2q - 1 * ELEM_SIZE + offsetq] ; m7 = u[y+2, x-1]
subpd m7, [u_up2q + 1 * ELEM_SIZE + offsetq] ; - u[y+2, x+1]
subpd m7, [u_upq + 2 * ELEM_SIZE + offsetq] ; - u[y+1, x+2]
addpd m7, [u_upq - 2 * ELEM_SIZE + offsetq] ; + u[y+1, x-2]
addpd m7, [u_downq + 2 * ELEM_SIZE + offsetq] ; + u[y-1, x+2]
subpd m7, [u_downq - 2 * ELEM_SIZE + offsetq] ; - u[y-1, x-2]
addpd m7, [u_down2q + 1 * ELEM_SIZE + offsetq] ; + u[y-2, x+1]
subpd m7, [u_down2q - 1 * ELEM_SIZE + offsetq] ; - u[y-2, x-1]
vfmadd123pd m6, m14, m7 ; m6 = 8 m6 + m7
movu m7, [u_up2q + 2 * ELEM_SIZE + offsetq] ; m7 = u[y+2, x+2]
subpd m7, [u_up2q - 2 * ELEM_SIZE + offsetq] ; - u[y+2, x-2]
subpd m7, [u_down2q + 2 * ELEM_SIZE + offsetq] ; - u[y-2, x+2]
addpd m7, [u_down2q - 2 * ELEM_SIZE + offsetq] ; + u[y-2, x-2]
vfmadd123pd m6, m14, m7 ; m6 = 8 m6 + m7
%endif
vfmadd231pd m0, m6, [diff_coeffs11q + offsetq] ; res += d_xy u * diff_coeffs11
%endmacro
; %1: stencil
%macro RESIDUAL_CALC 1
%define stencil %1
; compute the mask for absolute value
pcmpeqq m13, m13
psrlq m13, 1
movu m12, [res_maxq]
; load pointers to the equation coefficients
%define diff_coeffs20q diff_coeffsq ; reuse the array register to store the last pointer
mov diff_coeffs00q, [diff_coeffsq + OFF_DIFF_COEFF_00]
mov diff_coeffs01q, [diff_coeffsq + OFF_DIFF_COEFF_01]
mov diff_coeffs10q, [diff_coeffsq + OFF_DIFF_COEFF_10]
mov diff_coeffs11q, [diff_coeffsq + OFF_DIFF_COEFF_11]
mov diff_coeffs02q, [diff_coeffsq + OFF_DIFF_COEFF_02]
mov diff_coeffs20q, [diff_coeffsq + OFF_DIFF_COEFF_20]
; setup the data pointers and the loop counter
shl strideq, 3
shl linesizeq, 3
add dstq, linesizeq
add uq, linesizeq
add rhsq, linesizeq
add diff_coeffs00q, linesizeq
add diff_coeffs01q, linesizeq
add diff_coeffs10q, linesizeq
add diff_coeffs11q, linesizeq
add diff_coeffs02q, linesizeq
add diff_coeffs20q, linesizeq
neg linesizeq
; from now on, the register that held linesize is used as the offset into data arrays
%define offsetq linesizeq
; setup pointers to the line above and below
lea u_upq, [uq + strideq]
mov u_downq, uq
sub u_downq, strideq
%if stencil == 2
lea u_up2q, [uq + 2 * strideq]
neg strideq
add strideq, u_downq
%define u_down2q strideq ; reuse the stride register for the u[y-2] line
movu m15, [const30]
movu m14, [const8]
%endif
.loop:
xorpd m0, m0
subpd m0, [rhsq + offsetq] ; res = -rhs
; plain value
movu m6, [uq + offsetq] ; m6 = u[x]
vfmadd231pd m0, m6, [diff_coeffs00q + offsetq] ; res += u * diff_coeffs00
%if stencil == 1
addpd m6, m6 ; m6 = 2 * u[x]
%else
mulpd m6, m15 ; m6 = 30 * u[x]
%endif
RES_ADD_DIFF_SINGLEDIR stencil, 0
RES_ADD_DIFF_SINGLEDIR stencil, 1
RES_ADD_DIFF_MIXED stencil
andpd m6, m0, m13 ; m6 = abs(res)
; store the result
add offsetq, mmsize
jg .store_partial
; store full block
movu [dstq + offsetq - mmsize], m0
maxpd m12, m6
js .loop
jmp .finish
.store_partial:
sub offsetq, ELEM_SIZE
jz .store3
sub offsetq, ELEM_SIZE
jz .store2
.store1:
; offsetq is now mmsize-2 after the write position
movq [dstq + offsetq - mmsize + 2 * ELEM_SIZE], xm0
vpermq m6, m6, 0
maxpd m12, m6
jmp .finish
.store2:
; offsetq is now mmsize-2 after the write position
movu [dstq + offsetq - mmsize + 2 * ELEM_SIZE], xm0
mova xm6, xm6
maxpd m12, m6
jmp .finish
.store3:
; offsetq is now mmsize-1 after the write position
movu [dstq + offsetq - mmsize + 1 * ELEM_SIZE], xm0
vextractf128 xm0, m0, 1
movq [dstq + offsetq - mmsize + 3 * ELEM_SIZE], xm0
vpermq m6, m6, 10100100b
maxpd m12, m6
.finish:
movu [res_maxq], m12
RET
%endmacro
INIT_YMM fma3
cglobal residual_calc_line_s1, 7, 14, 14, linesize, dst, res_max, stride, u, rhs, diff_coeffs,\
diff_coeffs00, diff_coeffs01, diff_coeffs10, diff_coeffs11, diff_coeffs02, u_down, u_up
RESIDUAL_CALC 1
INIT_YMM fma3
cglobal residual_calc_line_s2, 7, 15, 16, linesize, dst, res_max, stride, u, rhs, diff_coeffs,\
diff_coeffs00, diff_coeffs01, diff_coeffs10, diff_coeffs11, diff_coeffs02, u_down, u_up, u_up2
RESIDUAL_CALC 2
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