From 7719d297f2a1da0e45fd39cad21e99e23fd695c8 Mon Sep 17 00:00:00 2001
From: Tomer Shalev <shalev.tomer@gmail.com>
Date: Fri, 15 Jan 2010 05:53:15 +0000
Subject: FS#10911 - Plugins: Fractals (formerly Mandelbrot)

- Rename the mandelbrot plugin to fractals
- Update manual accordingly
- Separate plugin's functionality into separate files
- Lay the ground for having fractals sets other than the Mandelbrot set.
  For that the following will need to be implemented:
  - Create a new file for the new fracral set
  - Provide key mapping to switch between sets


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24230 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/fractals/cpu_sh7043.c | 94 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 94 insertions(+)
 create mode 100644 apps/plugins/fractals/cpu_sh7043.c

(limited to 'apps/plugins/fractals/cpu_sh7043.c')

diff --git a/apps/plugins/fractals/cpu_sh7043.c b/apps/plugins/fractals/cpu_sh7043.c
new file mode 100644
index 0000000000..1bce37d654
--- /dev/null
+++ b/apps/plugins/fractals/cpu_sh7043.c
@@ -0,0 +1,94 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2009 Tomer Shalev
+ *
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "cpu_sh7043.h"
+
+inline short muls16_asr10(short a, short b)
+{
+    short r;
+    asm (
+        "muls    %[a],%[b]   \n"
+        "sts     macl,%[r]   \n"
+        "shlr8   %[r]        \n"
+        "shlr2   %[r]        \n"
+        : /* outputs */
+        [r]"=r"(r)
+        : /* inputs */
+        [a]"r"(a),
+        [b]"r"(b)
+    );
+    return r;
+}
+
+inline long muls32_asr26(long a, long b)
+{
+    long r, t1, t2, t3;
+    asm (
+        /* Signed 32bit * 32bit -> 64bit multiplication.
+           Notation: xxab * xxcd, where each letter represents 16 bits.
+           xx is the 64 bit sign extension.  */
+        "swap.w  %[a],%[t1]  \n" /* t1 = ba */
+        "mulu    %[t1],%[b]  \n" /* a * d */
+        "swap.w  %[b],%[t3]  \n" /* t3 = dc */
+        "sts     macl,%[t2]  \n" /* t2 = a * d */
+        "mulu    %[t1],%[t3] \n" /* a * c */
+        "sts     macl,%[r]   \n" /* hi = a * c */
+        "mulu    %[a],%[t3]  \n" /* b * c */
+        "clrt                \n"
+        "sts     macl,%[t3]  \n" /* t3 = b * c */
+        "addc    %[t2],%[t3] \n" /* t3 += t2, carry -> t2 */
+        "movt    %[t2]       \n"
+        "mulu    %[a],%[b]   \n" /* b * d */
+        "mov     %[t3],%[t1] \n" /* t1t3 = t2t3 << 16 */
+        "xtrct   %[t2],%[t1] \n"
+        "shll16  %[t3]       \n"
+        "sts     macl,%[t2]  \n" /* lo = b * d */
+        "clrt                \n" /* hi.lo += t1t3 */
+        "addc    %[t3],%[t2] \n"
+        "addc    %[t1],%[r]  \n"
+        "cmp/pz  %[a]        \n" /* ab >= 0 ? */
+        "bt      1f          \n"
+        "sub     %[b],%[r]   \n" /* no: hi -= cd (sign extension of ab is -1) */
+    "1:                      \n"
+        "cmp/pz  %[b]        \n" /* cd >= 0 ? */
+        "bt      2f          \n"
+        "sub     %[a],%[r]   \n" /* no: hi -= ab (sign extension of cd is -1) */
+    "2:                      \n"
+        /* Shift right by 26 and return low 32 bits */
+        "shll2   %[r]        \n" /* hi <<= 6 */
+        "shll2   %[r]        \n"
+        "shll2   %[r]        \n"
+        "shlr16  %[t2]       \n" /* (unsigned)lo >>= 26 */
+        "shlr8   %[t2]       \n"
+        "shlr2   %[t2]       \n"
+        "or      %[t2],%[r]  \n" /* combine result */
+        : /* outputs */
+        [r] "=&r"(r),
+        [t1]"=&r"(t1),
+        [t2]"=&r"(t2),
+        [t3]"=&r"(t3)
+        : /* inputs */
+        [a] "r"  (a),
+        [b] "r"  (b)
+    );
+    return r;
+}
+
-- 
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