diff options
author | Tom Schouten <doelie@users.sourceforge.net> | 2003-01-21 10:27:33 +0000 |
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committer | Tom Schouten <doelie@users.sourceforge.net> | 2003-01-21 10:27:33 +0000 |
commit | 9b8745d5250c9d0b60c9aa5a77f58a3fcddf1076 (patch) | |
tree | 8372b6a414a7124cec57efc9c80845e2bc1b157d /system/mmx/pixel_rand_s16.s |
This commit was generated by cvs2svn to compensate for changes in r352,svn2git-root
which included commits to RCS files with non-trunk default branches.
svn path=/trunk/externals/pdp/; revision=353
Diffstat (limited to 'system/mmx/pixel_rand_s16.s')
-rw-r--r-- | system/mmx/pixel_rand_s16.s | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/system/mmx/pixel_rand_s16.s b/system/mmx/pixel_rand_s16.s new file mode 100644 index 0000000..649400b --- /dev/null +++ b/system/mmx/pixel_rand_s16.s @@ -0,0 +1,76 @@ +# 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 + |