From 1d6df54df27cb41c02226678a2c8f9feddd1a1e0 Mon Sep 17 00:00:00 2001
From: Jens Arnold <amiconn@rockbox.org>
Date: Sun, 7 Jun 2009 21:27:05 +0000
Subject: Convert a number of places in core and plugins to use the BIT_N()
 macro instead of 1<<n. Speeds up things on SH1, and also reduces core
 binsize. Most notable speedups: 1 bit lcd driver: drawpixel +20%, drawline +
 27%, hline +5%; jpeg viewer: +8% for 1/8 scaling. Other targets are
 unaffected.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21205 a1c6a512-1295-4272-9138-f99709370657
---
 apps/plugins/lib/helper.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'apps/plugins/lib/helper.c')

diff --git a/apps/plugins/lib/helper.c b/apps/plugins/lib/helper.c
index e35e43a40a..b95ee7ab35 100644
--- a/apps/plugins/lib/helper.c
+++ b/apps/plugins/lib/helper.c
@@ -22,6 +22,20 @@
 #include "plugin.h"
 #include "helper.h"
 
+#ifdef CPU_SH
+/* Lookup table for using the BIT_N() macro in plugins */
+const unsigned bit_n_table[32] = {
+    1LU<< 0, 1LU<< 1, 1LU<< 2, 1LU<< 3,
+    1LU<< 4, 1LU<< 5, 1LU<< 6, 1LU<< 7,
+    1LU<< 8, 1LU<< 9, 1LU<<10, 1LU<<11,
+    1LU<<12, 1LU<<13, 1LU<<14, 1LU<<15,
+    1LU<<16, 1LU<<17, 1LU<<18, 1LU<<19,
+    1LU<<20, 1LU<<21, 1LU<<22, 1LU<<23,
+    1LU<<24, 1LU<<25, 1LU<<26, 1LU<<27,
+    1LU<<28, 1LU<<29, 1LU<<30, 1LU<<31
+};
+#endif
+
 /*  Force the backlight on */
 void backlight_force_on(void)
 {
-- 
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