Big performance improvement for liba52. A couple of small ASM opts, and lots IRAM usage.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6676 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 25 insertions, 0 deletions

diff --git a/apps/codecs/liba52/a52_internal.h b/apps/codecs/liba52/a52_internal.h
index 32b1160903..4de21d9dde 100644
--- a/apps/codecs/liba52/a52_internal.h
+++ b/apps/codecs/liba52/a52_internal.h
@@ -141,6 +141,31 @@ typedef int16_t quantizer_t;
 #if 0
 #define MUL(a,b) ((int)(((int64_t)(a) * (b) + (1 << 29)) >> 30))
 #define MUL_L(a,b) ((int)(((int64_t)(a) * (b) + (1 << 25)) >> 26))
+#elif CONFIG_CPU==MCF5249 && !defined(SIMULATOR)
+/* loses 1 bit of accuracy */
+#define MUL(a, b) \
+({ \
+    int32_t t; \
+    asm volatile ( \
+        "mac.l %[A], %[B], %%acc0\n\t" \
+        "movclr.l %%acc0, %[t]\n\t" \
+        "asl.l #1, %[t]" \
+        : [t] "=d" (t) \
+        : [A] "r" ((a)), [B] "r" ((b))); \
+    t; \
+})
+/* loses 5 bits of accuracy */
+#define MUL_L(a, b) \
+({ \
+    int32_t t; \
+    asm volatile ( \
+        "mac.l %[A], %[B], %%acc0\n\t" \
+        "movclr.l %%acc0, %[t]\n\t" \
+        "asl.l #5, %[t]" \
+        : [t] "=d" (t) \
+        : [A] "r" ((a)), [B] "r" ((b))); \
+    t; \
+})
 #elif 1
 #define MUL(a,b) \
 ({ int32_t _ta=(a), _tb=(b), _tc; \