iPod 1st..3rd Gen: Nearly halve the cost of software treble/bass (and eq) by putting the filter routine in IRAM.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14452 a1c6a512-1295-4272-9138-f99709370657

apps/eq_arm.S

@@ -17,6 +17,8 @@
  *
  ****************************************************************************/
 
+#include "config.h"
+
 /* uncomment this to make filtering calculate lower bits after shifting.
  * without this, "shift" of the lower bits will be lost here.
  */
@@ -26,7 +28,11 @@
  * void eq_filter(int32_t **x, struct eqfilter *f, unsigned num,
  *                unsigned channels, unsigned shift)
  */
+#if CONFIG_CPU == PP5002
+    .section    .icode,"ax",%progbits
+#else
     .text
+#endif
     .global eq_filter
 eq_filter:
     ldr r12, [sp]             @ get shift parameter