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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_rand_s16
.type pixel_rand_s16,@function
# mmx rgba pixel gain
# void pixel_rand_s16(int *dst, nb_4pixel_vectors, short int random_seed[4])
pixel_rand_s16:
pushl %ebp
movl %esp, %ebp
push %esi
push %edi
movl 16(%ebp), %esi # int16[4] array of random seeds
movl 8(%ebp), %edi # dst array
movl 12(%ebp), %ecx # pixel count
movq (%esi), %mm6
pcmpeqw %mm3, %mm3
psrlw $15, %mm3 # get bit mask 4 times 0x0001
.align 16
.loop_rand:
# prefetch 128(%esi)
movq %mm6, %mm4 # get random vector
psrlw $15, %mm4 # get first component
movq %mm6, %mm5
psrlw $14, %mm5 # get second component
pxor %mm5, %mm4
movq %mm6, %mm5
psrlw $12, %mm5 # get third component
pxor %mm5, %mm4
movq %mm6, %mm5
psrlw $3, %mm5 # get forth component
pxor %mm5, %mm4
psllw $1, %mm6 # shift left original random vector
pand %mm3, %mm4 # isolate new bit
por %mm4, %mm6 # combine into new random vector
movq %mm6, (%edi)
addl $8, %edi
decl %ecx
jnz .loop_rand # loop
movq %mm6, (%esi) # store random seeds
emms
pop %edi
pop %esi
leave
ret
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