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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.
#
.globl pixel_mix_s16
.type pixel_mix_s16,@function
# mmx rgba pixel gain
# void pixel_mix_s16(int *left, int *right, int nb_4pixel_vectors,
# short int gain_left[4], short int gain_right[4])
pixel_mix_s16:
pushl %ebp
movl %esp, %ebp
push %esi
push %edi
movl 20(%ebp), %edi # int16[4] array of gains
movq (%edi), %mm6 # get left gain array
movl 24(%ebp), %edi # int16[4] array of gains
movq (%edi), %mm7 # get right gain array
movl 8(%ebp), %edi # left array
movl 12(%ebp), %esi # right array
movl 16(%ebp), %ecx # pixel count
.align 16
.loop_mix:
# prefetch 128(%esi)
movq (%esi), %mm1 # load right 4 pixels from memory
pmulhw %mm7, %mm1 # apply right gain
movq (%edi), %mm0 # load 4 left pixels from memory
pmulhw %mm6, %mm0 # apply left gain
# pslaw $1, %mm1 # shift left ((s).15 x (s).15 -> (s0).14))
# pslaw $1, %mm0
paddsw %mm0, %mm0 # no shift left arithmic, so use add instead
paddsw %mm1, %mm1
paddsw %mm1, %mm0 # mix
movq %mm0, (%edi)
addl $8, %esi
addl $8, %edi
decl %ecx
jnz .loop_mix # loop
emms
pop %edi
pop %esi
leave
ret
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