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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_pack_s16u8_y
.type pixel_pack_s16u8_y,@function
# mmx rgba pixel gain
# void pixel_pack_s16u8_y(int *input, int *output, int nb_8pixel_vectors)
pixel_pack_s16u8_y:
pushl %ebp
movl %esp, %ebp
push %esi
push %edi
# movl 20(%ebp), %edi # int16[4] array of gains
# movq (%edi), %mm7 # get gain array
# psllw $1, %mm7 # adjust for shifted sign bit
movl 8(%ebp), %esi # input array
movl 12(%ebp), %edi # output array
movl 16(%ebp), %ecx # pixel count
pxor %mm6, %mm6
.align 16
.loop_pack_y:
# prefetch 128(%esi)
movq (%esi), %mm0 # load 4 pixels from memory
# pmulhw %mm7, %mm0 # apply gain
movq 8(%esi), %mm1 # load 4 pixels from memory
# pmulhw %mm7, %mm1 # apply gain
# movq %mm0, %mm2
# pcmpgtw %mm6, %mm2 # mm2 > 0 ? 0xffff : 0
# pand %mm2, %mm0
# movq %mm1, %mm3
# pcmpgtw %mm6, %mm3 # mm3 > 0 ? 0xffff : 0
# pand %mm3, %mm1
# psllw $1, %mm0 # shift out sign bit
# psllw $1, %mm1 # shift out sign bit
psraw $7, %mm0 # shift to lsb
psraw $7, %mm1 # shift to lsb
packuswb %mm1, %mm0 # pack & saturate to 8bit vector
movq %mm0, (%edi) # store result in memory
addl $16, %esi # increment source pointer
addl $8, %edi # increment dest pointer
decl %ecx
jnz .loop_pack_y # loop
emms
pop %edi
pop %esi
leave
ret
.globl pixel_pack_s16u8_uv
.type pixel_pack_s16u8_uv,@function
pixel_pack_s16u8_uv:
pushl %ebp
movl %esp, %ebp
push %esi
push %edi
# movl 20(%ebp), %edi # int16[4] array of gains
# movq (%edi), %mm7 # get gain array
movl 8(%ebp), %esi # pixel array offset
movl 12(%ebp), %edi # nb of elements
movl 16(%ebp), %ecx # pixel count
pcmpeqw %mm6, %mm6
psllw $15, %mm6
movq %mm6, %mm5
psrlw $8, %mm5
por %mm5, %mm6 # mm6 <- 8 times 0x80
.align 16
.loop_pack_uv:
# prefetch 128(%esi)
movq (%esi), %mm0 # load 4 pixels from memory
# pmulhw %mm7, %mm0 # apply gain
movq 8(%esi), %mm1 # load 4 pixels from memory
# pmulhw %mm7, %mm1 # apply gain
psraw $8, %mm0 # shift to msb
psraw $8, %mm1
packsswb %mm1, %mm0 # pack & saturate to 8bit vector
pxor %mm6, %mm0 # flip sign bits
movq %mm0, (%edi) # store result in memory
addl $16, %esi # increment source pointer
addl $8, %edi # increment dest pointer
decl %ecx
jnz .loop_pack_uv # loop
emms
pop %edi
pop %esi
leave
ret
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