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authorTom Schouten <doelie@users.sourceforge.net>2003-01-21 10:27:33 +0000
committerTom Schouten <doelie@users.sourceforge.net>2003-01-21 10:27:33 +0000
commit9b8745d5250c9d0b60c9aa5a77f58a3fcddf1076 (patch)
tree8372b6a414a7124cec57efc9c80845e2bc1b157d /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')
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1 files changed, 76 insertions, 0 deletions
diff --git a/system/mmx/pixel_rand_s16.s b/system/mmx/pixel_rand_s16.s
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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
+