Basic optimizations of the Vorbis decoder for the ihp-1x0.

Capable of real-time decoding with cpu freq at 120mhz.


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@6527 a1c6a512-1295-4272-9138-f99709370657

21 files changed, 422 insertions, 104 deletions

diff --git a/apps/codecs/Tremor/Makefile b/apps/codecs/Tremor/Makefile
index 20e30bbbf6..2b4adf146f 100644
--- a/apps/codecs/Tremor/Makefile
+++ b/apps/codecs/Tremor/Makefile
@@ -14,7 +14,7 @@ ifdef APPEXTRA
 INCLUDES += -I$(APPSDIR)/$(APPEXTRA)
 endif
 
-TREMOROPTS =
+TREMOROPTS = -O2
 CFLAGS = $(GCCOPTS) $(TREMOROPTS) $(INCLUDES) $(TARGET) $(EXTRA_DEFINES) \
 -DMEM=${MEMORYSIZE}
 
diff --git a/apps/codecs/Tremor/asm_mcf5249.h b/apps/codecs/Tremor/asm_mcf5249.h
new file mode 100644
index 0000000000..09c74671bc
--- /dev/null
+++ b/apps/codecs/Tremor/asm_mcf5249.h
@@ -0,0 +1,257 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ *
+ * Copyright (C) 2005 by Pedro Vasconcelos
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+/* asm routines for wide math on the MCF5249 */
+
+#include "os_types.h"
+
+#if CONFIG_CPU == MCF5249 && !defined(SIMULATOR)
+
+#ifndef _V_WIDE_MATH
+#define _V_WIDE_MATH
+
+//#define MB() asm volatile ("" : : : "memory")
+#define MB()
+
+static inline void mcf5249_init_mac(void) {
+  int r;
+  asm volatile ("move.l #0x20, %%macsr;"  // frac, truncate, no saturation
+		"movclr.l %%acc0, %[r];"  // clear accumulators
+		"move.l %%acc0, %%acc1;"
+		"move.l %%acc0, %%acc2;"
+		"move.l %%acc0, %%acc3;"
+		: [r] "=r" (r));
+}
+
+static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) {
+  ogg_int32_t r;
+  asm volatile ("mac.l %[x], %[y], %%acc0;"  // multiply into acc
+		"movclr.l %%acc0, %[r];"     // move & clear acc
+		"asr.l #1, %[r];"            // no overflow test
+		: [r] "=d" (r)
+		: [x] "r" (x), [y] "r" (y)
+		: "cc");
+  return r;
+}
+
+static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
+  ogg_int32_t r;
+  asm volatile ("mac.l %[x], %[y], %%acc0;" // multiply
+		"movclr.l %%acc0, %[r];"    // move and clear
+		: [r] "=r" (r)
+		: [x] "r" (x), [y] "r" (y)
+		: "cc");
+  return r;
+}
+
+
+static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
+  ogg_int32_t r;
+  asm volatile ("mac.l %[x], %[y], %%acc0;"  // multiply
+		"movclr.l %%acc0, %[r];"     // get higher half
+		"mulu.l %[y], %[x];"         // get lower half
+		"asl.l #8, %[r];"    // hi << 17
+		"asl.l #8, %[r];"
+		"lsr.l #8, %[x];"    // (unsigned)lo >> 15
+		"lsr.l #7, %[x];"
+		"or.l %[x], %[r];"   // or
+		: [r] "=&d" (r), [x] "+d" (x)
+		: [y] "d" (y)
+		: "cc");
+  return r;
+}
+
+
+static inline 
+void XPROD31(ogg_int32_t  a, ogg_int32_t  b,   
+	     ogg_int32_t  t, ogg_int32_t  v,
+	     ogg_int32_t *x, ogg_int32_t *y)
+{ 
+  ogg_int32_t r;
+  asm volatile ("mac.l %[a], %[t], %%acc0;"
+		"mac.l %[b], %[v], %%acc0;"
+		"mac.l %[b], %[t], %%acc1;"
+		"msac.l %[a], %[v], %%acc1;"
+		"movclr.l %%acc0, %[r];"
+		"move.l %[r], (%[x]);"
+		"movclr.l %%acc1, %[r];"
+		"move.l %[r], (%[y]);"
+		: [r] "=&r" (r)
+		: [x] "a" (x), [y] "a" (y),
+		  [a] "r" (a), [b] "r" (b), [t] "r" (t), [v] "r" (v)
+		: "cc", "memory");
+}
+
+
+static inline
+void XNPROD31(ogg_int32_t  a, ogg_int32_t  b,   
+	      ogg_int32_t  t, ogg_int32_t  v,
+	      ogg_int32_t *x, ogg_int32_t *y)
+{
+  ogg_int32_t r;
+  asm volatile ("mac.l %[a], %[t], %%acc0;"
+		"msac.l %[b], %[v], %%acc0;"
+		"mac.l %[b], %[t], %%acc1;"
+		"mac.l %[a], %[v], %%acc1;"
+		"movclr.l %%acc0, %[r];"
+		"move.l %[r], (%[x]);"
+		"movclr.l %%acc1, %[r];"
+		"move.l %[r], (%[y]);"
+		: [r] "=&r" (r)
+		: [x] "a" (x), [y] "a" (y),
+		  [a] "r" (a), [b] "r" (b), [t] "r" (t), [v] "r" (v)
+		: "cc", "memory");
+}
+
+
+/* no faster way of doing this using the MAC? */
+#define XPROD32(_a, _b, _t, _v, _x, _y)		\
+  { (_x)=MULT32(_a,_t)+MULT32(_b,_v);		\
+    (_y)=MULT32(_b,_t)-MULT32(_a,_v); }
+
+
+/* asm versions of vector multiplication for window.c */
+/* assumes MAC is initialized & accumulators cleared */
+static inline 
+void mcf5249_vect_mult_fw(ogg_int32_t *data, LOOKUP_T *window, int n)
+{
+  asm volatile ("movem.l (%[d]), %%d0-%%d3;"  // loop start
+		"movem.l (%[w]), %%a0-%%a3;"  // pre-fetch registers
+		"lea.l (4*4, %[w]), %[w];"
+		"bra 1f;"               // jump to loop condition
+		"0:" // loop body
+		// multiply and load next window values
+		"mac.l %%d0, %%a0, (%[w])+, %%a0, %%acc0;"
+		"mac.l %%d1, %%a1, (%[w])+, %%a1, %%acc1;"
+		"mac.l %%d2, %%a2, (%[w])+, %%a2, %%acc2;"
+		"mac.l %%d3, %%a3, (%[w])+, %%a3, %%acc3;"		
+		"movclr.l %%acc0, %%d0;"  // get the products
+		"movclr.l %%acc1, %%d1;"
+		"movclr.l %%acc2, %%d2;"
+		"movclr.l %%acc3, %%d3;"
+		// store and advance
+		"movem.l %%d0-%%d3, (%[d]);"  
+		"lea.l (4*4, %[d]), %[d];"
+		"movem.l (%[d]), %%d0-%%d3;"
+		"subq.l #4, %[n];"     // done 4 elements
+		"1: cmpi.l #4, %[n];"
+		"bge 0b;"
+		// multiply final elements
+		"tst.l %[n];"
+		"beq 1f;"      // n=0
+		"mac.l %%d0, %%a0, %%acc0;"
+		"movclr.l %%acc0, %%d0;"
+		"move.l %%d0, (%[d])+;"
+		"subq.l #1, %[n];"
+		"beq 1f;"     // n=1
+		"mac.l %%d1, %%a1, %%acc0;"
+		"movclr.l %%acc0, %%d1;"
+		"move.l %%d1, (%[d])+;"
+		"subq.l #1, %[n];"
+		"beq 1f;"     // n=2
+		// otherwise n = 3
+		"mac.l %%d2, %%a2, %%acc0;"
+		"movclr.l %%acc0, %%d2;"
+		"move.l %%d2, (%[d])+;"
+		"1:"
+		: [n] "+d" (n), [d] "+a" (data), [w] "+a" (window)
+		: : "%d0", "%d1", "%d2", "%d3", "%a0", "%a1", "%a2", "%a3",
+                    "cc", "memory");
+}
+
+static inline 
+void mcf5249_vect_mult_bw(ogg_int32_t *data, LOOKUP_T *window, int n)
+{
+  asm volatile ("lea.l (-3*4, %[w]), %[w];"     // loop start
+		"movem.l (%[d]), %%d0-%%d3;"    // pre-fetch registers
+		"movem.l (%[w]), %%a0-%%a3;"
+		"bra 1f;"               // jump to loop condition
+		"0:" // loop body
+		// multiply and load next window value
+		"mac.l %%d0, %%a3, -(%[w]), %%a3, %%acc0;"
+		"mac.l %%d1, %%a2, -(%[w]), %%a2, %%acc1;"
+		"mac.l %%d2, %%a1, -(%[w]), %%a1, %%acc2;"
+		"mac.l %%d3, %%a0, -(%[w]), %%a0, %%acc3;"		
+		"movclr.l %%acc0, %%d0;"  // get the products
+		"movclr.l %%acc1, %%d1;"
+		"movclr.l %%acc2, %%d2;"
+		"movclr.l %%acc3, %%d3;"
+		// store and advance
+		"movem.l %%d0-%%d3, (%[d]);"  
+		"lea.l (4*4, %[d]), %[d];"
+		"movem.l (%[d]), %%d0-%%d3;"
+		"subq.l #4, %[n];"     // done 4 elements
+		"1: cmpi.l #4, %[n];"
+		"bge 0b;"
+		// multiply final elements
+		"tst.l %[n];"
+		"beq 1f;"      // n=0
+		"mac.l %%d0, %%a3, %%acc0;"
+		"movclr.l %%acc0, %%d0;"
+		"move.l %%d0, (%[d])+;"
+		"subq.l #1, %[n];"
+		"beq 1f;"     // n=1
+		"mac.l %%d1, %%a2, %%acc0;"
+		"movclr.l %%acc0, %%d1;"
+		"move.l %%d1, (%[d])+;"
+		"subq.l #1, %[n];"
+		"beq 1f;"     // n=2
+		// otherwise n = 3
+		"mac.l %%d2, %%a1, %%acc0;"
+		"movclr.l %%acc0, %%d2;"
+		"move.l %%d2, (%[d])+;"
+		"1:"
+		: [n] "+d" (n), [d] "+a" (data), [w] "+a" (window)
+		: : "%d0", "%d1", "%d2", "%d3", "%a0", "%a1", "%a2", "%a3",
+                    "cc", "memory");
+}
+
+
+static inline 
+void mcf5249_vect_zero(ogg_int32_t *ptr, int n)
+{
+  asm volatile ("clr.l %%d0;"
+		"clr.l %%d1;"
+		"clr.l %%d2;"
+		"clr.l %%d3;"
+		// loop start
+		"tst.l %[n];"
+		"bra 1f;"
+		"0: movem.l %%d0-%%d3, (%[ptr]);"
+		"lea (4*4, %[ptr]), %[ptr];"
+		"subq.l #4, %[n];"
+		"1: bgt 0b;"
+		// remaing elements
+		"tst.l %[n];"
+		"beq 1f;"      // n=0
+		"clr.l (%[ptr])+;"
+		"subq.l #1, %[n];"
+		"beq 1f;"     // n=1
+		"clr.l (%[ptr])+;"
+		"subq.l #1, %[n];"
+		"beq 1f;"     // n=2
+		// otherwise n = 3
+		"clr.l (%[ptr])+;"
+		"1:"
+		: [n] "+d" (n), [ptr] "+a" (ptr)
+		:
+		: "%d0","%d1","%d2","%d3","cc","memory");
+}
+
+
+#endif
+#endif
diff --git a/apps/codecs/Tremor/bitwise.c b/apps/codecs/Tremor/bitwise.c
index b75ac408b8..fa9dcd6eff 100644
--- a/apps/codecs/Tremor/bitwise.c
+++ b/apps/codecs/Tremor/bitwise.c
@@ -22,7 +22,7 @@
 #include <string.h>
 #include "ogg.h"
 
-static unsigned long mask[]=
+static const unsigned long mask[] IDATA_ATTR =
 {0x00000000,0x00000001,0x00000003,0x00000007,0x0000000f,
  0x0000001f,0x0000003f,0x0000007f,0x000000ff,0x000001ff,
  0x000003ff,0x000007ff,0x00000fff,0x00001fff,0x00003fff,
diff --git a/apps/codecs/Tremor/block.c b/apps/codecs/Tremor/block.c
index a4571c37d4..6f88fb812c 100644
--- a/apps/codecs/Tremor/block.c
+++ b/apps/codecs/Tremor/block.c
@@ -172,8 +172,12 @@ static int _vds_init(vorbis_dsp_state *v,vorbis_info *vi){
   v->pcm_storage=ci->blocksizes[1];
   v->pcm=(ogg_int32_t **)_ogg_malloc(vi->channels*sizeof(*v->pcm));
   v->pcmret=(ogg_int32_t **)_ogg_malloc(vi->channels*sizeof(*v->pcmret));
+
+  // pbv: allow for extra padding for windowing
   for(i=0;i<vi->channels;i++)
     v->pcm[i]=(ogg_int32_t *)_ogg_calloc(v->pcm_storage,sizeof(*v->pcm[i]));
+    // v->pcm[i]=(ogg_int32_t *)_ogg_calloc(v->pcm_storage,sizeof(*v->pcm[i]));
+    
 
   /* all 1 (large block) or 0 (small block) */
   /* explicitly set for the sake of clarity */
diff --git a/apps/codecs/Tremor/codebook.c b/apps/codecs/Tremor/codebook.c
index bb99487feb..4da7641553 100644
--- a/apps/codecs/Tremor/codebook.c
+++ b/apps/codecs/Tremor/codebook.c
@@ -306,7 +306,7 @@ long vorbis_book_decodev_set(codebook *book,ogg_int32_t *a,
   return(0);
 }
 
-long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,\
+long vorbis_book_decodevv_add(codebook *book,ogg_int32_t **a,
 			      long offset,int ch,
 			      oggpack_buffer *b,int n,int point){
   long i,j,entry;
diff --git a/apps/codecs/Tremor/config-tremor.h b/apps/codecs/Tremor/config-tremor.h
index 81aa5bffab..8307d87b77 100644
--- a/apps/codecs/Tremor/config-tremor.h
+++ b/apps/codecs/Tremor/config-tremor.h
@@ -1,5 +1,4 @@
-#include "../codec.h"
-
+#include "../codec.h" 
 #ifdef ROCKBOX_BIG_ENDIAN
 #define BIG_ENDIAN 1
 #define LITTLE_ENDIAN 0
@@ -9,4 +8,6 @@
 #define LITTLE_ENDIAN 1
 #define BIG_ENDIAN 0
 #endif
-#define _LOW_ACCURACY_
+
+
+// #define _LOW_ACCURACY_
diff --git a/apps/codecs/Tremor/floor1.c b/apps/codecs/Tremor/floor1.c
index 9bfec7e803..7f54aa76ea 100644
--- a/apps/codecs/Tremor/floor1.c
+++ b/apps/codecs/Tremor/floor1.c
@@ -124,7 +124,7 @@ static int icomp(const void *a,const void *b){
 static vorbis_look_floor *floor1_look(vorbis_dsp_state *vd,vorbis_info_mode *mi,
                               vorbis_info_floor *in){
 
-  int *sortpointer[VIF_POSIT+2];
+  static int *sortpointer[VIF_POSIT+2] IDATA_ATTR;
   vorbis_info_floor1 *info=(vorbis_info_floor1 *)in;
   vorbis_look_floor1 *look=(vorbis_look_floor1 *)_ogg_calloc(1,sizeof(*look));
   int i,j,n=0;
@@ -216,7 +216,7 @@ static int render_point(int x0,int x1,int y0,int y1,int x){
 #  define XdB(n) (n)
 #endif
 
-static const ogg_int32_t FLOOR_fromdB_LOOKUP[256]={
+static ogg_int32_t FLOOR_fromdB_LOOKUP[256] IDATA_ATTR ={
   XdB(0x000000e5), XdB(0x000000f4), XdB(0x00000103), XdB(0x00000114),
   XdB(0x00000126), XdB(0x00000139), XdB(0x0000014e), XdB(0x00000163),
   XdB(0x0000017a), XdB(0x00000193), XdB(0x000001ad), XdB(0x000001c9),
@@ -283,14 +283,14 @@ static const ogg_int32_t FLOOR_fromdB_LOOKUP[256]={
   XdB(0x69f80e9a), XdB(0x70dafda8), XdB(0x78307d76), XdB(0x7fffffff),
 };
   
-static void render_line(int x0,int x1,int y0,int y1,ogg_int32_t *d){
+static void render_line(int x0,register int x1,int y0,int y1,ogg_int32_t *d){
   int dy=y1-y0;
-  int adx=x1-x0;
-  int ady=abs(dy);
-  int base=dy/adx;
-  int sy=(dy<0?base-1:base+1);
-  int x=x0;
-  int y=y0;
+  register int x=x0;
+  register int y=y0;
+  register int adx=x1-x0;
+  register int ady=abs(dy);
+  register int base=dy/adx;
+  register int sy=(dy<0?base-1:base+1);
   int err=0;
 
   ady-=abs(base*adx);
@@ -433,7 +433,7 @@ static int floor1_inverse2(vorbis_block *vb,vorbis_look_floor *in,void *memo,
 }
 
 /* export hooks */
-vorbis_func_floor floor1_exportbundle={
+vorbis_func_floor floor1_exportbundle  = {
   &floor1_unpack,&floor1_look,&floor1_free_info,
   &floor1_free_look,&floor1_inverse1,&floor1_inverse2
 };
diff --git a/apps/codecs/Tremor/framing.c b/apps/codecs/Tremor/framing.c
index 419c7dc8a3..9133333bda 100644
--- a/apps/codecs/Tremor/framing.c
+++ b/apps/codecs/Tremor/framing.c
@@ -501,7 +501,7 @@ int ogg_page_packets(ogg_page *og){
 /* Static CRC calculation table.  See older code in CVS for dead
    run-time initialization code. */
 
-static ogg_uint32_t crc_lookup[256]={
+static ogg_uint32_t crc_lookup[256] IDATA_ATTR = {
   0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,
   0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
   0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,
diff --git a/apps/codecs/Tremor/lsp_lookup.h b/apps/codecs/Tremor/lsp_lookup.h
index fa84851887..cced7c9282 100644
--- a/apps/codecs/Tremor/lsp_lookup.h
+++ b/apps/codecs/Tremor/lsp_lookup.h
@@ -26,7 +26,7 @@
 #define FROMdB2_SHIFT 3
 #define FROMdB2_MASK 31
 
-static const ogg_int32_t FROMdB_LOOKUP[FROMdB_LOOKUP_SZ]={
+static const ogg_int32_t FROMdB_LOOKUP[FROMdB_LOOKUP_SZ]  ={
   0x003fffff, 0x0028619b, 0x00197a96, 0x0010137a,
   0x000a24b0, 0x00066666, 0x000409c3, 0x00028c42,
   0x00019b8c, 0x000103ab, 0x0000a3d7, 0x00006760,
@@ -37,7 +37,7 @@ static const ogg_int32_t FROMdB_LOOKUP[FROMdB_LOOKUP_SZ]={
   0x0000000b, 0x00000007, 0x00000004, 0x00000003,
   0x00000002, 0x00000001, 0x00000001};
 
-static const ogg_int32_t FROMdB2_LOOKUP[FROMdB2_LOOKUP_SZ]={
+static const ogg_int32_t FROMdB2_LOOKUP[FROMdB2_LOOKUP_SZ]  ={
   0x000001fc, 0x000001f5, 0x000001ee, 0x000001e7,
   0x000001e0, 0x000001d9, 0x000001d2, 0x000001cc,
   0x000001c5, 0x000001bf, 0x000001b8, 0x000001b2,
@@ -50,7 +50,7 @@ static const ogg_int32_t FROMdB2_LOOKUP[FROMdB2_LOOKUP_SZ]={
 
 #define INVSQ_LOOKUP_I_SHIFT 10
 #define INVSQ_LOOKUP_I_MASK 1023
-static const long INVSQ_LOOKUP_I[64+1]={
+static const long INVSQ_LOOKUP_I[64+1]  ={
 	   92682,   91966,   91267,   90583,
 	   89915,   89261,   88621,   87995,
 	   87381,   86781,   86192,   85616,
@@ -70,7 +70,7 @@ static const long INVSQ_LOOKUP_I[64+1]={
 	   65536,
 };
 
-static const long INVSQ_LOOKUP_IDel[64]={
+static const long INVSQ_LOOKUP_IDel[64]  ={
              716,     699,     684,     668,
              654,     640,     626,     614,
              600,     589,     576,     565,
@@ -92,7 +92,7 @@ static const long INVSQ_LOOKUP_IDel[64]={
 #define COS_LOOKUP_I_SHIFT 9
 #define COS_LOOKUP_I_MASK 511
 #define COS_LOOKUP_I_SZ 128
-static const ogg_int32_t COS_LOOKUP_I[COS_LOOKUP_I_SZ+1]={
+static const ogg_int32_t COS_LOOKUP_I[COS_LOOKUP_I_SZ+1]  ={
 	   16384,   16379,   16364,   16340,
 	   16305,   16261,   16207,   16143,
 	   16069,   15986,   15893,   15791,
diff --git a/apps/codecs/Tremor/mapping0.c b/apps/codecs/Tremor/mapping0.c
index d4ab3a6a29..26d6289d4e 100644
--- a/apps/codecs/Tremor/mapping0.c
+++ b/apps/codecs/Tremor/mapping0.c
@@ -28,6 +28,8 @@
 #include "registry.h"
 #include "misc.h"
 
+
+
 /* simplistic, wasteful way of doing this (unique lookup for each
    mode/submapping); there should be a central repository for
    identical lookups.  That will require minor work, so I'm putting it
@@ -124,6 +126,7 @@ static int ilog(unsigned int v){
   return(ret);
 }
 
+
 /* also responsible for range checking */
 static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb){
   int i;
@@ -176,7 +179,17 @@ static vorbis_info_mapping *mapping0_unpack(vorbis_info *vi,oggpack_buffer *opb)
   return(NULL);
 }
 
-static int seq=0;
+
+/* IRAM buffer keep the pcm data; only for windows size upto 2048
+   for space restrictions. No real compromise, larger window sizes
+   are only used for very low quality settings (q<0?) */
+#define IRAM_PCM_SIZE 2048
+static ogg_int32_t pcm_iram[IRAM_PCM_SIZE] IDATA_ATTR;
+
+static int seq = 0;
+
+#define CHANNELS 2    /* max 2 channels on the ihp-1xx (stereo)  */
+
 static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
   vorbis_dsp_state     *vd=vb->vd;
   vorbis_info          *vi=vd->vi;
@@ -188,12 +201,16 @@ static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
   int                   i,j;
   long                  n=vb->pcmend=ci->blocksizes[vb->W];
 
-  ogg_int32_t **pcmbundle=(ogg_int32_t **)alloca(sizeof(*pcmbundle)*vi->channels);
-  int    *zerobundle=(int *)alloca(sizeof(*zerobundle)*vi->channels);
-  
-  int   *nonzero  =(int *)alloca(sizeof(*nonzero)*vi->channels);
-  void **floormemo=(void **)alloca(sizeof(*floormemo)*vi->channels);
-  
+  /* statically allocate mapping structures in IRAM */
+  static ogg_int32_t *pcmbundle[CHANNELS] IDATA_ATTR;
+  static int    zerobundle[CHANNELS] IDATA_ATTR;
+  static int   nonzero[CHANNELS] IDATA_ATTR;
+  static void *floormemo[CHANNELS] IDATA_ATTR;
+
+  /* test for too many channels; 
+     (maybe this is can be checked at the stream level?) */
+  if (vi->channels > CHANNELS) return (-1);
+
   /* time domain information decode (note that applying the
      information would have to happen later; we'll probably add a
      function entry to the harness for that later */
@@ -272,38 +289,64 @@ static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
   //for(j=0;j<vi->channels;j++)
   //_analysis_output("residue",seq+j,vb->pcm[j],-8,n/2,0,0);
 
+
+/* pbv: removed this loop by fusion with the following one 
+   to avoid recopying data to/from the IRAM */
+#if 0
   /* compute and apply spectral envelope */
   for(i=0;i<vi->channels;i++){
     ogg_int32_t *pcm=vb->pcm[i];
     int submap=info->chmuxlist[i];
     look->floor_func[submap]->
       inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
-  }
+  } 
+#endif
 
   //for(j=0;j<vi->channels;j++)
   //_analysis_output("mdct",seq+j,vb->pcm[j],-24,n/2,0,1);
 
   /* transform the PCM data; takes PCM vector, vb; modifies PCM vector */
   /* only MDCT right now.... */
-  for(i=0;i<vi->channels;i++){
-    ogg_int32_t *pcm=vb->pcm[i];
-    mdct_backward(n,pcm,pcm);
+
+  /* check if we can do this in IRAM */
+  if(n <= IRAM_PCM_SIZE) {  /* normal window size: yes */
+    for(i=0;i<vi->channels;i++){
+      ogg_int32_t *pcm=vb->pcm[i];
+      int submap=info->chmuxlist[i];
+
+      if(nonzero[i]) {
+	memcpy(pcm_iram, pcm, sizeof(ogg_int32_t)*n);
+	look->floor_func[submap]->
+	  inverse2(vb,look->floor_look[submap],floormemo[i],pcm_iram);
+	mdct_backward(n, pcm_iram, pcm_iram);
+	/* window the data */
+	_vorbis_apply_window(pcm_iram,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
+	memcpy(pcm, pcm_iram, sizeof(ogg_int32_t)*n);
+      }
+      else 
+	memset(pcm, 0, sizeof(ogg_int32_t)*n);
+    }
+  }
+  else {         /* large window: no, do it in the normal memory */
+    for(i=0;i<vi->channels;i++){
+      ogg_int32_t *pcm=vb->pcm[i];
+      int submap=info->chmuxlist[i];
+
+      look->floor_func[submap]->
+	inverse2(vb,look->floor_look[submap],floormemo[i],pcm);
+      if(nonzero[i]) {
+	mdct_backward(n, pcm, pcm);
+	/* window the data */
+	_vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
+      }
+      else 
+	memset(pcm, 0, sizeof(ogg_int32_t)*n);
+    }
   }
 
   //for(j=0;j<vi->channels;j++)
   //_analysis_output("imdct",seq+j,vb->pcm[j],-24,n,0,0);
 
-  /* window the data */
-  for(i=0;i<vi->channels;i++){
-    ogg_int32_t *pcm=vb->pcm[i];
-    if(nonzero[i])
-      _vorbis_apply_window(pcm,b->window,ci->blocksizes,vb->lW,vb->W,vb->nW);
-    else
-      for(j=0;j<n;j++)
-	pcm[j]=0;
-    
-  }
-
   //for(j=0;j<vi->channels;j++)
   //_analysis_output("window",seq+j,vb->pcm[j],-24,n,0,0);
 
@@ -313,10 +356,11 @@ static int mapping0_inverse(vorbis_block *vb,vorbis_look_mapping *l){
 }
 
 /* export hooks */
-vorbis_func_mapping mapping0_exportbundle={
+vorbis_func_mapping mapping0_exportbundle ={
   &mapping0_unpack,
   &mapping0_look,
   &mapping0_free_info,
   &mapping0_free_look,
   &mapping0_inverse
 };
+
diff --git a/apps/codecs/Tremor/mdct.c b/apps/codecs/Tremor/mdct.c
index cc201b2106..2d2564f196 100644
--- a/apps/codecs/Tremor/mdct.c
+++ b/apps/codecs/Tremor/mdct.c
@@ -94,7 +94,7 @@ STIN void mdct_butterfly_16(DATA_TYPE *x){
 }
 
 /* 32 point butterfly (in place, 4 register) */
-STIN void mdct_butterfly_32(DATA_TYPE *x){
+STIN  void mdct_butterfly_32(DATA_TYPE *x){
 
   REG_TYPE r0, r1;
 
@@ -152,7 +152,7 @@ STIN void mdct_butterfly_generic(DATA_TYPE *x,int points,int step){
   DATA_TYPE *x2        = x + (points>>1) - 8;
   REG_TYPE   r0;
   REG_TYPE   r1;
-
+  
   do{
     r0 = x1[6] - x2[6]; x1[6] += x2[6];
     r1 = x2[7] - x1[7]; x1[7] += x2[7];
@@ -180,7 +180,7 @@ STIN void mdct_butterfly_generic(DATA_TYPE *x,int points,int step){
     r0 = x1[4] - x2[4]; x1[4] += x2[4];
     r1 = x1[5] - x2[5]; x1[5] += x2[5];
     XNPROD31( r0, r1, T[0], T[1], &x2[4], &x2[5] ); T-=step;
-
+    
     r0 = x1[2] - x2[2]; x1[2] += x2[2];
     r1 = x1[3] - x2[3]; x1[3] += x2[3];
     XNPROD31( r0, r1, T[0], T[1], &x2[2], &x2[3] ); T-=step;
@@ -231,7 +231,7 @@ STIN void mdct_butterfly_generic(DATA_TYPE *x,int points,int step){
   }while(T>sincos_lookup0);
 }
 
-STIN void mdct_butterflies(DATA_TYPE *x,int points,int shift){
+STIN void mdct_butterflies(DATA_TYPE *x,int points,int shift) {
 
   int stages=8-shift;
   int i,j;
@@ -243,33 +243,34 @@ STIN void mdct_butterflies(DATA_TYPE *x,int points,int shift){
 
   for(j=0;j<points;j+=32)
     mdct_butterfly_32(x+j);
-
 }
 
-static unsigned char bitrev[16]={0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};
+
+static const unsigned char bitrev[16] 
+   IDATA_ATTR = {0,8,4,12,2,10,6,14,1,9,5,13,3,11,7,15};
 
 STIN int bitrev12(int x){
   return bitrev[x>>8]|(bitrev[(x&0x0f0)>>4]<<4)|(((int)bitrev[x&0x00f])<<8);
 }
 
-STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift){
+STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift) {
 
   int          bit   = 0;
   DATA_TYPE   *w0    = x;
   DATA_TYPE   *w1    = x = w0+(n>>1);
   LOOKUP_T    *T = (step>=4)?(sincos_lookup0+(step>>1)):sincos_lookup1;
   LOOKUP_T    *Ttop  = T+1024;
-  DATA_TYPE    r2;
+  REG_TYPE    r2;
 
   do{
-    DATA_TYPE r3     = bitrev12(bit++);
+    REG_TYPE r3      = bitrev12(bit++);
     DATA_TYPE *x0    = x + ((r3 ^ 0xfff)>>shift) -1;
     DATA_TYPE *x1    = x + (r3>>shift);
 
     REG_TYPE  r0     = x0[0]  + x1[0];
     REG_TYPE  r1     = x1[1]  - x0[1];
 
-	      XPROD32( r0, r1, T[1], T[0], &r2, &r3 ); T+=step;
+	      XPROD32( r0, r1, T[1], T[0], r2, r3 ); T+=step;
 
 	      w1    -= 4;
 
@@ -287,7 +288,7 @@ STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift){
               r0     = x0[0]  + x1[0];
               r1     = x1[1]  - x0[1];
 
-	      XPROD32( r0, r1, T[1], T[0], &r2, &r3 ); T+=step;
+	      XPROD32( r0, r1, T[1], T[0], r2, r3 ); T+=step;
 
               r0     = (x0[1] + x1[1])>>1;
               r1     = (x0[0] - x1[0])>>1;
@@ -299,14 +300,14 @@ STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift){
 	      w0    += 4;
   }while(T<Ttop);
   do{
-    DATA_TYPE r3     = bitrev12(bit++);
+    REG_TYPE r3     = bitrev12(bit++);
     DATA_TYPE *x0    = x + ((r3 ^ 0xfff)>>shift) -1;
     DATA_TYPE *x1    = x + (r3>>shift);
 
     REG_TYPE  r0     = x0[0]  + x1[0];
     REG_TYPE  r1     = x1[1]  - x0[1];
 
-	      T-=step; XPROD32( r0, r1, T[0], T[1], &r2, &r3 );
+	      T-=step; XPROD32( r0, r1, T[0], T[1], r2, r3 );
 
 	      w1    -= 4;
 
@@ -324,7 +325,7 @@ STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift){
               r0     = x0[0]  + x1[0];
               r1     = x1[1]  - x0[1];
 
-	      T-=step; XPROD32( r0, r1, T[0], T[1], &r2, &r3 );
+	      T-=step; XPROD32( r0, r1, T[0], T[1], r2, r3 );
 
               r0     = (x0[1] + x1[1])>>1;
               r1     = (x0[0] - x1[0])>>1;
@@ -337,7 +338,8 @@ STIN void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift){
   }while(w0<w1);
 }
 
-void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){
+
+void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out) {
   int n2=n>>1;
   int n4=n>>2;
   DATA_TYPE *iX;
@@ -347,6 +349,10 @@ void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){
   int shift;
   int step;
 
+#if CONFIG_CPU == MCF5249
+  mcf5249_init_mac();  /* should be redundant */
+#endif
+
   for (shift=6;!(n&(1<<shift));shift++);
   shift=13-shift;
   step=2<<shift;
@@ -389,7 +395,6 @@ void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){
 
   mdct_butterflies(out+n2,n2,shift);
   mdct_bitreverse(out,n,step,shift);
-
   /* rotate + window */
 
   step>>=2;
@@ -507,4 +512,3 @@ void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out){
     }while(oX1>oX2);
   }
 }
-
diff --git a/apps/codecs/Tremor/mdct.h b/apps/codecs/Tremor/mdct.h
index 6d8890720c..bdfe0e7304 100644
--- a/apps/codecs/Tremor/mdct.h
+++ b/apps/codecs/Tremor/mdct.h
@@ -34,8 +34,10 @@
 #define cPI1_8 (0x7641af3d)
 #endif
 
-extern void mdct_forward(int n, DATA_TYPE *in, DATA_TYPE *out);
+//extern void mdct_forward(int n, DATA_TYPE *in, DATA_TYPE *out);
 extern void mdct_backward(int n, DATA_TYPE *in, DATA_TYPE *out);
+//extern void mdct_bitreverse(DATA_TYPE *x,int n,int step,int shift);
+//extern void mdct_butterflies(DATA_TYPE *x,int points,int shift);
 
 #endif
 
diff --git a/apps/codecs/Tremor/mdct_lookup.h b/apps/codecs/Tremor/mdct_lookup.h
index 970e199f7f..8a88997376 100644
--- a/apps/codecs/Tremor/mdct_lookup.h
+++ b/apps/codecs/Tremor/mdct_lookup.h
@@ -17,8 +17,10 @@
   
 #include "os_types.h"
 
+/* keep lookup tables in fast IRAM */
+
 /* {sin(2*i*PI/4096), cos(2*i*PI/4096)}, with i = 0 to 512 */
-static LOOKUP_T sincos_lookup0[1026] = {
+static LOOKUP_T sincos_lookup0[1026] IDATA_ATTR = {
   X(0x00000000), X(0x7fffffff), X(0x003243f5), X(0x7ffff621),
   X(0x006487e3), X(0x7fffd886), X(0x0096cbc1), X(0x7fffa72c),
   X(0x00c90f88), X(0x7fff6216), X(0x00fb5330), X(0x7fff0943),
@@ -279,7 +281,7 @@ static LOOKUP_T sincos_lookup0[1026] = {
   };
   
   /* {sin((2*i+1)*PI/4096), cos((2*i+1)*PI/4096)}, with i = 0 to 511 */
-static LOOKUP_T sincos_lookup1[1024] = {
+static LOOKUP_T sincos_lookup1[1024] IDATA_ATTR = {
   X(0x001921fb), X(0x7ffffd88), X(0x004b65ee), X(0x7fffe9cb),
   X(0x007da9d4), X(0x7fffc251), X(0x00afeda8), X(0x7fff8719),
   X(0x00e23160), X(0x7fff3824), X(0x011474f6), X(0x7ffed572),
diff --git a/apps/codecs/Tremor/misc.h b/apps/codecs/Tremor/misc.h
index ed7617d0e0..dc2dccf116 100644
--- a/apps/codecs/Tremor/misc.h
+++ b/apps/codecs/Tremor/misc.h
@@ -23,6 +23,7 @@
 #include "os_types.h"
 
 #include "asm_arm.h"
+#include "asm_mcf5249.h"
   
 
 /* Some prototypes that were not defined elsewhere */
@@ -36,7 +37,6 @@ void* alloca(size_t size);
   
 #ifndef  _LOW_ACCURACY_
 /* 64 bit multiply */
-
 //#include <sys/types.h>
 
 #if BYTE_ORDER==LITTLE_ENDIAN
@@ -47,9 +47,7 @@ union magic {
   } halves;
   ogg_int64_t whole;
 };
-#endif 
-
-#if BYTE_ORDER==BIG_ENDIAN
+#elif BYTE_ORDER==BIG_ENDIAN
 union magic {
   struct {
     ogg_int32_t hi;
@@ -64,7 +62,6 @@ static inline ogg_int32_t MULT32(ogg_int32_t x, ogg_int32_t y) {
   magic.whole = (ogg_int64_t)x * y;
   return magic.halves.hi;
 }
-
 static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
   return MULT32(x,y)<<1;
 }
@@ -102,7 +99,6 @@ static inline ogg_int32_t MULT31(ogg_int32_t x, ogg_int32_t y) {
 static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
   return (x >> 6) * y;  /* y preshifted >>9 */
 }
-
 #endif
 
 /*
@@ -122,11 +118,15 @@ static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
  * macros.
  */
 
+/* replaced XPROD32 with a macro to avoid memory reference 
+   _x, _y are the results (must be l-values) */
+#define XPROD32(_a, _b, _t, _v, _x, _y)		\
+  { (_x)=MULT32(_a,_t)+MULT32(_b,_v);		\
+    (_y)=MULT32(_b,_t)-MULT32(_a,_v); }
+
+
 #ifdef __i386__
 
-#define XPROD32(_a, _b, _t, _v, _x, _y)		\
-  { *(_x)=MULT32(_a,_t)+MULT32(_b,_v);		\
-    *(_y)=MULT32(_b,_t)-MULT32(_a,_v); }
 #define XPROD31(_a, _b, _t, _v, _x, _y)		\
   { *(_x)=MULT31(_a,_t)+MULT31(_b,_v);		\
     *(_y)=MULT31(_b,_t)-MULT31(_a,_v); }
@@ -136,14 +136,6 @@ static inline ogg_int32_t MULT31_SHIFT15(ogg_int32_t x, ogg_int32_t y) {
 
 #else
 
-static inline void XPROD32(ogg_int32_t  a, ogg_int32_t  b,
-			   ogg_int32_t  t, ogg_int32_t  v,
-			   ogg_int32_t *x, ogg_int32_t *y)
-{
-  *x = MULT32(a, t) + MULT32(b, v);
-  *y = MULT32(b, t) - MULT32(a, v);
-}
-
 static inline void XPROD31(ogg_int32_t  a, ogg_int32_t  b,
 			   ogg_int32_t  t, ogg_int32_t  v,
 			   ogg_int32_t *x, ogg_int32_t *y)
@@ -159,9 +151,7 @@ static inline void XNPROD31(ogg_int32_t  a, ogg_int32_t  b,
   *x = MULT31(a, t) - MULT31(b, v);
   *y = MULT31(b, t) + MULT31(a, v);
 }
-
 #endif
-
 #endif
 
 #ifndef _V_CLIP_MATH
@@ -245,4 +235,3 @@ static inline ogg_int32_t VFLOAT_ADD(ogg_int32_t a,ogg_int32_t ap,
 
 
 
-
diff --git a/apps/codecs/Tremor/os.h b/apps/codecs/Tremor/os.h
index 65a4992ffc..bb4b867e3d 100644
--- a/apps/codecs/Tremor/os.h
+++ b/apps/codecs/Tremor/os.h
@@ -24,12 +24,12 @@
 #  define _V_IFDEFJAIL_H_
 
 #  ifdef __GNUC__
-#    define STIN static __inline__
+#    define STIN static inline
 #  elif _WIN32
-#    define STIN static __inline
+#    define STIN static __inline__
 #  endif
 #else
-#  define STIN static
+#  define STIN static inline
 #endif
 
 #ifndef M_PI
diff --git a/apps/codecs/Tremor/os_types.h b/apps/codecs/Tremor/os_types.h
index fe0331770f..1e0cb1332f 100644
--- a/apps/codecs/Tremor/os_types.h
+++ b/apps/codecs/Tremor/os_types.h
@@ -21,7 +21,7 @@
 
 #ifdef _LOW_ACCURACY_
 #  define X(n) (((((n)>>22)+1)>>1) - ((((n)>>22)+1)>>9))
-#  define LOOKUP_T const unsigned char
+#  define LOOKUP_T const unsigned char  
 #else
 #  define X(n) (n)
 #  define LOOKUP_T const ogg_int32_t
diff --git a/apps/codecs/Tremor/registry.c b/apps/codecs/Tremor/registry.c
index c0b5fec0cc..0882309b32 100644
--- a/apps/codecs/Tremor/registry.c
+++ b/apps/codecs/Tremor/registry.c
@@ -31,18 +31,18 @@ extern vorbis_func_residue   residue1_exportbundle;
 extern vorbis_func_residue   residue2_exportbundle;
 extern vorbis_func_mapping   mapping0_exportbundle;
 
-vorbis_func_floor     *_floor_P[]={
+vorbis_func_floor     *_floor_P[]  = {
   &floor0_exportbundle,
   &floor1_exportbundle,
 };
 
-vorbis_func_residue   *_residue_P[]={
+vorbis_func_residue   *_residue_P[]  = {
   &residue0_exportbundle,
   &residue1_exportbundle,
   &residue2_exportbundle,
 };
 
-vorbis_func_mapping   *_mapping_P[]={
+vorbis_func_mapping   *_mapping_P[]  = {
   &mapping0_exportbundle,
 };
 
diff --git a/apps/codecs/Tremor/res012.c b/apps/codecs/Tremor/res012.c
index 1ead185d8f..3d69cee73b 100644
--- a/apps/codecs/Tremor/res012.c
+++ b/apps/codecs/Tremor/res012.c
@@ -309,7 +309,7 @@ int res2_inverse(vorbis_block *vb,vorbis_look_residue *vl,
 }
 
 
-vorbis_func_residue residue0_exportbundle={
+const vorbis_func_residue residue0_exportbundle  ={
   &res0_unpack,
   &res0_look,
   &res0_free_info,
@@ -317,7 +317,7 @@ vorbis_func_residue residue0_exportbundle={
   &res0_inverse
 };
 
-vorbis_func_residue residue1_exportbundle={
+const vorbis_func_residue residue1_exportbundle  ={
   &res0_unpack,
   &res0_look,
   &res0_free_info,
@@ -325,7 +325,7 @@ vorbis_func_residue residue1_exportbundle={
   &res1_inverse
 };
 
-vorbis_func_residue residue2_exportbundle={
+const vorbis_func_residue residue2_exportbundle  ={
   &res0_unpack,
   &res0_look,
   &res0_free_info,
diff --git a/apps/codecs/Tremor/vorbisfile.c b/apps/codecs/Tremor/vorbisfile.c
index d9eeed3945..74bff6a3fb 100644
--- a/apps/codecs/Tremor/vorbisfile.c
+++ b/apps/codecs/Tremor/vorbisfile.c
@@ -669,6 +669,10 @@ static int _ov_open1(void *f,OggVorbis_File *vf,char *initial,
   int offsettest=(f?callbacks.seek_func(f,0,SEEK_CUR):-1);
   int ret;
 
+#if CONFIG_CPU == MCF5249 
+  mcf5249_init_mac();   /* initialize the Coldfire MAC unit */
+#endif
+
   memset(vf,0,sizeof(*vf));
   vf->datasource=f;
   vf->callbacks = callbacks;
diff --git a/apps/codecs/Tremor/window.c b/apps/codecs/Tremor/window.c
index b50e36f413..b447ce5ad9 100644
--- a/apps/codecs/Tremor/window.c
+++ b/apps/codecs/Tremor/window.c
@@ -56,7 +56,6 @@ const void *_vorbis_window(int type, int left){
 void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
 			  long *blocksizes,
 			  int lW,int W,int nW){
-  
   LOOKUP_T *window[2]={window_p[0],window_p[1]};
   long n=blocksizes[W];
   long ln=blocksizes[lW];
@@ -67,7 +66,14 @@ void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
 
   long rightbegin=n/2+n/4-rn/4;
   long rightend=rightbegin+rn/2;
-  
+
+#if CONFIG_CPU == MCF5249
+  mcf5249_init_mac();   /* shouldn't be needed, but just in case */
+  mcf5249_vect_zero(&d[0], leftbegin);
+  mcf5249_vect_mult_fw(&d[leftbegin], &window[lW][0], leftend-leftbegin);
+  mcf5249_vect_mult_bw(&d[rightbegin], &window[nW][rn/2-1], rightend-rightbegin);
+  mcf5249_vect_zero(&d[rightend], n-rightend);
+#else  
   int i,p;
 
   for(i=0;i<leftbegin;i++)
@@ -81,4 +87,6 @@ void _vorbis_apply_window(ogg_int32_t *d,const void *window_p[2],
 
   for(;i<n;i++)
     d[i]=0;
+#endif
 }
+
diff --git a/apps/codecs/Tremor/window_lookup.h b/apps/codecs/Tremor/window_lookup.h
index b24fc37772..f9452e1b42 100644
--- a/apps/codecs/Tremor/window_lookup.h
+++ b/apps/codecs/Tremor/window_lookup.h
@@ -18,7 +18,8 @@
 
 #include "os_types.h"
 
-static LOOKUP_T vwin64[32] = {
+/* keep small window table in fast IRAM */
+static LOOKUP_T vwin64[32] IDATA_ATTR = {
   X(0x001f0003), X(0x01168c98), X(0x030333c8), X(0x05dfe3a4),
   X(0x09a49562), X(0x0e45df18), X(0x13b47ef2), X(0x19dcf676),
   X(0x20a74d83), X(0x27f7137c), X(0x2fabb05a), X(0x37a1105a),
@@ -29,7 +30,7 @@ static LOOKUP_T vwin64[32] = {
   X(0x7fdd78a5), X(0x7ff6ec6d), X(0x7ffed0e9), X(0x7ffffc3f),
 };
 
-static LOOKUP_T vwin128[64] = {
+static LOOKUP_T vwin128[64] IDATA_ATTR = {
   X(0x0007c04d), X(0x0045bb89), X(0x00c18b87), X(0x017ae294),
   X(0x02714a4e), X(0x03a4217a), X(0x05129952), X(0x06bbb24f),
   X(0x089e38a1), X(0x0ab8c073), X(0x0d09a228), X(0x0f8ef6bd),
@@ -48,7 +49,7 @@ static LOOKUP_T vwin128[64] = {
   X(0x7ffdcf39), X(0x7fff6dac), X(0x7fffed01), X(0x7fffffc4),
 };
 
-static LOOKUP_T vwin256[128] = {
+static LOOKUP_T vwin256[128] IDATA_ATTR = {
   X(0x0001f018), X(0x00117066), X(0x00306e9e), X(0x005ee5f1),
   X(0x009ccf26), X(0x00ea208b), X(0x0146cdea), X(0x01b2c87f),
   X(0x022dfedf), X(0x02b85ced), X(0x0351cbbd), X(0x03fa317f),
@@ -83,7 +84,7 @@ static LOOKUP_T vwin256[128] = {
   X(0x7fffdcd2), X(0x7ffff6d6), X(0x7ffffed0), X(0x7ffffffc),
 };
 
-static LOOKUP_T vwin512[256] = {
+static LOOKUP_T vwin512[256] IDATA_ATTR  = {
   X(0x00007c06), X(0x00045c32), X(0x000c1c62), X(0x0017bc4c),
   X(0x00273b7a), X(0x003a9955), X(0x0051d51c), X(0x006cede7),
   X(0x008be2a9), X(0x00aeb22a), X(0x00d55b0d), X(0x00ffdbcc),
@@ -150,7 +151,7 @@ static LOOKUP_T vwin512[256] = {
   X(0x7ffffdcd), X(0x7fffff6d), X(0x7fffffed), X(0x7fffffff),
 };
 
-static LOOKUP_T vwin1024[512] = {
+static LOOKUP_T vwin1024[512] IDATA_ATTR = {
   X(0x00001f02), X(0x0001170e), X(0x00030724), X(0x0005ef40),
   X(0x0009cf59), X(0x000ea767), X(0x0014775e), X(0x001b3f2e),
   X(0x0022fec8), X(0x002bb618), X(0x00356508), X(0x00400b81),
@@ -281,7 +282,7 @@ static LOOKUP_T vwin1024[512] = {
   X(0x7fffffdd), X(0x7ffffff7), X(0x7fffffff), X(0x7fffffff),
 };
 
-static LOOKUP_T vwin2048[1024] = {
+static LOOKUP_T vwin2048[1024] IDATA_ATTR = {
   X(0x000007c0), X(0x000045c4), X(0x0000c1ca), X(0x00017bd3),
   X(0x000273de), X(0x0003a9eb), X(0x00051df9), X(0x0006d007),
   X(0x0008c014), X(0x000aee1e), X(0x000d5a25), X(0x00100428),
@@ -540,6 +541,8 @@ static LOOKUP_T vwin2048[1024] = {
   X(0x7ffffffe), X(0x7fffffff), X(0x7fffffff), X(0x7fffffff),
 };
 
+/* The remaining large window sizes are used only for very low
+   quality Vorbis files so we don't bother to put them in IRAM */
 static LOOKUP_T vwin4096[2048] = {
   X(0x000001f0), X(0x00001171), X(0x00003072), X(0x00005ef5),
   X(0x00009cf8), X(0x0000ea7c), X(0x00014780), X(0x0001b405),
@@ -1055,7 +1058,7 @@ static LOOKUP_T vwin4096[2048] = {
   X(0x7fffffff), X(0x7fffffff), X(0x7fffffff), X(0x7fffffff),
 };
 
-static LOOKUP_T vwin8192[4096] = {
+static LOOKUP_T vwin8192[4096]  = {
   X(0x0000007c), X(0x0000045c), X(0x00000c1d), X(0x000017bd),
   X(0x0000273e), X(0x00003a9f), X(0x000051e0), X(0x00006d02),
   X(0x00008c03), X(0x0000aee5), X(0x0000d5a7), X(0x00010049),