aboutsummaryrefslogtreecommitdiff
path: root/system/mmx/pixel_gain_s16.s
diff options
context:
space:
mode:
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_gain_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_gain_s16.s')
-rw-r--r--system/mmx/pixel_gain_s16.s71
1 files changed, 71 insertions, 0 deletions
diff --git a/system/mmx/pixel_gain_s16.s b/system/mmx/pixel_gain_s16.s
new file mode 100644
index 0000000..adcfdf5
--- /dev/null
+++ b/system/mmx/pixel_gain_s16.s
@@ -0,0 +1,71 @@
+# 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_gain_s16
+.type pixel_gain_s16,@function
+
+# gain is integer, shift count is down
+# void pixel_gain_s16(int *buf, int nb_8pixel_vectors, short int gain[4], unsigned long long *shift)
+
+pixel_gain_s16:
+ pushl %ebp
+ movl %esp, %ebp
+ push %esi
+ push %edi
+
+ movl 20(%ebp), %edi
+ movq (%edi), %mm6 # get shift vector
+
+ movl 16(%ebp), %edi
+ movq (%edi), %mm7 # get gain vector
+
+ movl 8(%ebp), %esi # input array
+ movl 12(%ebp), %ecx # pixel count
+
+
+ .align 16
+ .loop_gain:
+
+ movq (%esi), %mm0 # load 4 pixels from memory
+ movq %mm0, %mm1
+ pmulhw %mm7, %mm1 # apply gain (s15.0) fixed point, high word
+ pmullw %mm7, %mm0 # low word
+
+ movq %mm0, %mm2 # copy
+ movq %mm1, %mm3
+
+ punpcklwd %mm1, %mm0 # unpack lsw components
+ punpckhwd %mm3, %mm2 # unpack msw components
+
+ psrad %mm6, %mm0 # apply signed shift
+ psrad %mm6, %mm2
+
+ packssdw %mm2, %mm0 # pack result & saturate
+ movq %mm0, (%esi) # store result
+
+
+ addl $8, %esi # increment source pointer
+ decl %ecx
+ jnz .loop_gain # loop
+
+ emms
+
+ pop %edi
+ pop %esi
+ leave
+ ret
+