pdbox: Applied several changes by Buschel. Reintroduced compilation for iPods.

Changes by Buschel:

* Reduced footprint by making cosine table of size 1^13 instead of 1^15
* Corrected interpolation in the cos~ object
* Optimized multiplication on ARM platforms



git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26534 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 16 insertions, 0 deletions

diff --git a/apps/plugins/pdbox/PDa/src/m_fixed.h b/apps/plugins/pdbox/PDa/src/m_fixed.h
index aa7b74b5ba..57c9296457 100644
--- a/apps/plugins/pdbox/PDa/src/m_fixed.h
+++ b/apps/plugins/pdbox/PDa/src/m_fixed.h
@@ -12,8 +12,24 @@ typedef int t_sample;
 
 /* fixed point multiplication and division */
 
+#if defined(ROCKBOX) && defined(CPU_ARM)
+#define mult(A,B) \
+     ({ \
+        t_fixed lo; \
+        t_fixed hi; \
+        asm volatile ( \
+           "smull %[lo], %[hi], %[x], %[y] \n\t"   /* multiply */ \
+           "mov   %[lo], %[lo], lsr %[shr] \n\t"   /* lo >>= fix1 */ \
+           "orr   %[lo], %[lo], %[hi], lsl %[shl]" /* lo |= (hi << (32-fix1)) */ \
+           : [lo]"=&r"(lo), [hi]"=&r"(hi) \
+           : [x]"r"(A), [y]"r"(B), [shr]"r"(fix1), [shl]"r"(32-fix1)); \
+        lo; \
+     })
+#define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
+#else /* ROCKBOX && CPU_ARM */
 #define mult(a,b) (long long)(((long long) (a) * (long long) (b))>>fix1)
 #define idiv(a,b) ((((long long) (a) )<<fix1)/(long long) (b) )
+#endif /* ROCKBOX && CPU_ARM */
 
 /* conversion macros */