diff options
Diffstat (limited to 'system/mmx/pixel_pack_s16u8.s')
| -rw-r--r-- | system/mmx/pixel_pack_s16u8.s | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/system/mmx/pixel_pack_s16u8.s b/system/mmx/pixel_pack_s16u8.s new file mode 100644 index 0000000..57df702 --- /dev/null +++ b/system/mmx/pixel_pack_s16u8.s @@ -0,0 +1,126 @@ +# 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 + |