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author | Jens Arnold <amiconn@rockbox.org> | 2008-03-02 17:05:00 +0000 |
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committer | Jens Arnold <amiconn@rockbox.org> | 2008-03-02 17:05:00 +0000 |
commit | 52e1f815994413aa6068b13367ca0d04d9246182 (patch) | |
tree | ebae13e1b8e1931eac2faf7920ccbd6d4f0690d1 /apps/plugins/lib/grey_coldfire.S | |
parent | 1509faf618641a5dd1e8b33e0c1617dc521aa27c (diff) | |
download | rockbox-52e1f815994413aa6068b13367ca0d04d9246182.tar.gz rockbox-52e1f815994413aa6068b13367ca0d04d9246182.zip |
Greyscale library: Assembler optimised update for coldfire, ~73% speedup when using IRAM, ~35% speedup without IRAM. Slight optimisation for other targets as well.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16482 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'apps/plugins/lib/grey_coldfire.S')
-rwxr-xr-x | apps/plugins/lib/grey_coldfire.S | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/apps/plugins/lib/grey_coldfire.S b/apps/plugins/lib/grey_coldfire.S new file mode 100755 index 0000000000..cf66ca66b6 --- /dev/null +++ b/apps/plugins/lib/grey_coldfire.S | |||
@@ -0,0 +1,128 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id: grey_draw.c 16080 2008-01-13 18:39:09Z amiconn $ | ||
9 | * | ||
10 | * New greyscale framework | ||
11 | * Coldfire assembler routines | ||
12 | * | ||
13 | * This is a generic framework to display 129 shades of grey on low-depth | ||
14 | * bitmap LCDs (Archos b&w, Iriver & Ipod 4-grey) within plugins. | ||
15 | * | ||
16 | * Copyright (C) 2008 Jens Arnold | ||
17 | * | ||
18 | * All files in this archive are subject to the GNU General Public License. | ||
19 | * See the file COPYING in the source tree root for full license agreement. | ||
20 | * | ||
21 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
22 | * KIND, either express or implied. | ||
23 | * | ||
24 | ****************************************************************************/ | ||
25 | |||
26 | #include "config.h" | ||
27 | /* Plugins should not normally do this, but we need to check a macro, and | ||
28 | * plugin.h would confuse the assembler. */ | ||
29 | |||
30 | .text | ||
31 | .global _grey_line1 | ||
32 | .type _grey_line1, @function | ||
33 | |||
34 | #if (LCD_PIXELFORMAT == VERTICAL_PACKING) && (LCD_DEPTH == 2) | ||
35 | |||
36 | /**************************************************************************** | ||
37 | * void _grey_line1(int width, | ||
38 | * unsigned char *dst, | ||
39 | * const unsigned char *src, | ||
40 | * const unsigned char *lut); | ||
41 | */ | ||
42 | |||
43 | _grey_line1: | ||
44 | lea.l (-2*4, %sp), %sp | ||
45 | movem.l %d2/%a2, (%sp) | ||
46 | movem.l (2*4+4, %sp), %d2/%a0-%a2 | ||
47 | clr.l %d0 | ||
48 | |||
49 | move.l %a1, %d1 | ||
50 | and.l #1, %d1 | ||
51 | beq.s .p1_h_end | ||
52 | |||
53 | move.b (%a1)+, %d0 | ||
54 | move.b (%d0.l, %a2), (%a0) | ||
55 | addq.l #4, %a0 | ||
56 | subq.l #1, %d2 | ||
57 | .p1_h_end: | ||
58 | |||
59 | cmp.l #2, %d2 | ||
60 | blo.s .p2_t_end | ||
61 | move.l %a1, %d1 | ||
62 | and.l #2, %d1 | ||
63 | beq.s .p2_h_end | ||
64 | |||
65 | move.w (%a1)+, %d1 | ||
66 | move.w %d1, %d0 | ||
67 | lsr.l #8, %d0 | ||
68 | move.b (%d0.l, %a2), (%a0) | ||
69 | addq.l #4, %a0 | ||
70 | move.b %d1, %d0 | ||
71 | move.b (%d0.l, %a2), (%a0) | ||
72 | addq.l #4, %a0 | ||
73 | subq.l #2, %d2 | ||
74 | .p2_h_end: | ||
75 | |||
76 | subq.l #4, %d2 | ||
77 | blo.s .p4_end | ||
78 | |||
79 | .p4_loop: | ||
80 | move.l (%a1)+, %d1 | ||
81 | swap %d1 | ||
82 | move.w %d1, %d0 | ||
83 | lsr.l #8, %d0 | ||
84 | move.b (%d0.l, %a2), (%a0) | ||
85 | addq.l #4, %a0 | ||
86 | move.b %d1, %d0 | ||
87 | move.b (%d0.l, %a2), (%a0) | ||
88 | addq.l #4, %a0 | ||
89 | swap %d1 | ||
90 | move.w %d1, %d0 | ||
91 | lsr.l #8, %d0 | ||
92 | move.b (%d0.l, %a2), (%a0) | ||
93 | addq.l #4, %a0 | ||
94 | move.b %d1, %d0 | ||
95 | move.b (%d0.l, %a2), (%a0) | ||
96 | addq.l #4, %a0 | ||
97 | subq.l #4, %d2 | ||
98 | bhs.s .p4_loop | ||
99 | |||
100 | .p4_end: | ||
101 | addq.l #4, %d2 | ||
102 | cmp.l #2, %d2 | ||
103 | blo.s .p2_t_end | ||
104 | |||
105 | move.w (%a1)+, %d1 | ||
106 | move.w %d1, %d0 | ||
107 | lsr.l #8, %d0 | ||
108 | move.b (%d0.l, %a2), (%a0) | ||
109 | addq.l #4, %a0 | ||
110 | move.b %d1, %d0 | ||
111 | move.b (%d0.l, %a2), (%a0) | ||
112 | addq.l #4, %a0 | ||
113 | subq.l #2, %d2 | ||
114 | .p2_t_end: | ||
115 | |||
116 | tst.l %d2 | ||
117 | beq.s .p1_t_end | ||
118 | |||
119 | move.b (%a1)+, %d0 | ||
120 | move.b (%d0.l, %a2), (%a0) | ||
121 | .p1_t_end: | ||
122 | |||
123 | movem.l (%sp), %d2/%a2 | ||
124 | lea.l (2*4, %sp), %sp | ||
125 | rts | ||
126 | .size _grey_line1, . - _grey_line1 | ||
127 | |||
128 | #endif | ||