From de7c5711c5d67e7e69386d6e35e42c8ce15de69b Mon Sep 17 00:00:00 2001
From: Andrew Mahone <andrew.mahone@gmail.com>
Date: Sat, 6 Jun 2009 00:00:58 +0000
Subject: Add a system-wide BIT_N macro, implemented via an LUT on SH, and use
 it in the TAGCACHE_IS_* macros in place of per-set LUTs, removing duplication
 of data between those LUTs and the mask values used on other targets.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21195 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/target/sh/system-sh.c     | 11 +++++++++++
 firmware/target/sh/system-target.h |  7 +++++++
 2 files changed, 18 insertions(+)

(limited to 'firmware/target/sh')

diff --git a/firmware/target/sh/system-sh.c b/firmware/target/sh/system-sh.c
index 02af40282f..7779c975a7 100644
--- a/firmware/target/sh/system-sh.c
+++ b/firmware/target/sh/system-sh.c
@@ -27,6 +27,17 @@
 #include "font.h"
 #include "led.h"
 
+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
+};
+
 static const char* const irqname[] = {
     "", "", "", "", "IllInstr", "", "IllSltIn","","",
     "CPUAdrEr", "DMAAdrEr", "NMI", "UserBrk",
diff --git a/firmware/target/sh/system-target.h b/firmware/target/sh/system-target.h
index 3c225fbb69..2568911a1e 100644
--- a/firmware/target/sh/system-target.h
+++ b/firmware/target/sh/system-target.h
@@ -126,4 +126,11 @@ static inline uint32_t swap_odd_even32(uint32_t value)
     return value;
 }
 
+extern const unsigned bit_n_table[32];
+#define BIT_N(n) ( \
+    __builtin_constant_p(n) \
+    ? (1LU << (n)) \
+    : bit_n_table[n] \
+)
+
 #endif /* SYSTEM_TARGET_H */
-- 
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