From b694c274836ac8b04d644711ac324eac2e9ab83e Mon Sep 17 00:00:00 2001
From: Hans-Christoph Steiner <eighthave@users.sourceforge.net>
Date: Fri, 16 Dec 2005 01:05:40 +0000
Subject: checking in pdp 0.12.4 from
 http://zwizwa.fartit.com/pd/pdp/pdp-0.12.4.tar.gz

svn path=/trunk/externals/pdp/; revision=4232
---
 system/mmx/pixel_mix_s16.s | 68 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 system/mmx/pixel_mix_s16.s

(limited to 'system/mmx/pixel_mix_s16.s')

diff --git a/system/mmx/pixel_mix_s16.s b/system/mmx/pixel_mix_s16.s
new file mode 100644
index 0000000..9bf41eb
--- /dev/null
+++ b/system/mmx/pixel_mix_s16.s
@@ -0,0 +1,68 @@
+#    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_mix_s16
+.type  pixel_mix_s16,@function
+
+# mmx rgba pixel gain
+# void pixel_mix_s16(int *left, int *right, int nb_4pixel_vectors, 
+#	short int gain_left[4], short int gain_right[4])
+
+pixel_mix_s16:
+	pushl %ebp
+	movl %esp, %ebp
+	push %esi
+	push %edi
+
+	movl 20(%ebp), %edi	# int16[4] array of gains
+	movq (%edi), %mm6	# get left gain array
+
+	movl 24(%ebp), %edi	# int16[4] array of gains
+	movq (%edi), %mm7	# get right gain array
+	
+	movl 8(%ebp),  %edi	# left array
+	movl 12(%ebp), %esi	# right array
+	movl 16(%ebp), %ecx	# pixel count
+
+	
+	.align 16
+	.loop_mix:	
+
+#	prefetch 128(%esi)	
+	movq (%esi), %mm1	# load right 4 pixels from memory
+	pmulhw %mm7, %mm1	# apply right gain
+	movq (%edi), %mm0	# load 4 left pixels from memory
+	pmulhw %mm6, %mm0	# apply left gain
+#	pslaw $1, %mm1		# shift left ((s).15 x (s).15 -> (s0).14))
+#	pslaw $1, %mm0
+	paddsw %mm0, %mm0	# no shift left arithmic, so use add instead
+	paddsw %mm1, %mm1
+	paddsw %mm1, %mm0	# mix
+	movq %mm0, (%edi)
+	addl $8, %esi
+	addl $8, %edi
+	decl %ecx
+	jnz .loop_mix		# loop
+
+	emms
+
+	
+	pop %edi
+	pop %esi
+	leave
+	ret
+	
-- 
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