An altivec-optimized DCT64 for mp3lib

    (partially, it seems roughly three times as fast as
    the C code according to quick-n-dirty gprof tests)
    This one is bit-perfect.
patch by Romain Dolbeau <dolbeau@irisa.fr>


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9003 b3059339-0415-0410-9bf9-f77b7e298cf2

3 files changed, 541 insertions, 2 deletions

diff --git a/mp3lib/Makefile b/mp3lib/Makefile
index 4a7737a2e2..592691a32f 100644
--- a/mp3lib/Makefile
+++ b/mp3lib/Makefile
@@ -22,6 +22,13 @@ OBJS += dct36_3dnow.o dct64_3dnow.o
 SRCS += dct36_k7.s dct64_k7.c
 OBJS += dct36_k7.o dct64_k7.o
 endif
+ifeq ($(TARGET_ARCH_POWERPC),yes)
+ifeq ($(TARGET_ALTIVEC),yes)
+SRCS += dct64_altivec.c
+OBJS += dct64_altivec.o
+CFLAGS += -faltivec
+endif
+endif
 
 .SUFFIXES: .c .o
 
diff --git a/mp3lib/dct64_altivec.c b/mp3lib/dct64_altivec.c
new file mode 100644
index 0000000000..fa252da20c
--- /dev/null
+++ b/mp3lib/dct64_altivec.c
@@ -0,0 +1,525 @@
+
+/*
+ * Discrete Cosine Tansform (DCT) for subband synthesis
+ * optimized for machines with no auto-increment.
+ * The performance is highly compiler dependend. Maybe
+ * the dct64.c version for 'normal' processor may be faster
+ * even for Intel processors.
+ */
+
+#define real float
+
+#include "mpg123.h"
+
+#ifdef HAVE_ALTIVEC
+
+// used to build registers permutation vectors (vcprm)
+// the 's' are for words in the _s_econd vector
+#define WORD_0 0x00,0x01,0x02,0x03
+#define WORD_1 0x04,0x05,0x06,0x07
+#define WORD_2 0x08,0x09,0x0a,0x0b
+#define WORD_3 0x0c,0x0d,0x0e,0x0f
+#define WORD_s0 0x10,0x11,0x12,0x13
+#define WORD_s1 0x14,0x15,0x16,0x17
+#define WORD_s2 0x18,0x19,0x1a,0x1b
+#define WORD_s3 0x1c,0x1d,0x1e,0x1f
+
+#define vcprm(a,b,c,d) (const vector unsigned char)(WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d)
+
+// vcprmle is used to keep the same index as in the SSE version.
+// it's the same as vcprm, with the index inversed
+// ('le' is Little Endian)
+#define vcprmle(a,b,c,d) vcprm(d,c,b,a)
+
+// used to build inverse/identity vectors (vcii)
+// n is _n_egative, p is _p_ositive
+#define FLOAT_n -1.
+#define FLOAT_p 1.
+
+#define vcii(a,b,c,d) (const vector float)(FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d)
+
+void dct64_altivec(real *a,real *b,real *c)
+{
+  real __attribute__ ((aligned(16))) b1[0x20];
+  real __attribute__ ((aligned(16))) b2[0x20];
+  
+  real *out0 = a;
+  real *out1 = b;
+  real *samples = c;
+
+  const vector float vczero = (const vector float)(0.);
+  const vector unsigned char reverse = (const vector unsigned char)vcprm(3,2,1,0);
+
+
+  if (((unsigned long)b1 & 0x0000000F) ||
+      ((unsigned long)b2 & 0x0000000F))
+    
+  {
+    printf("MISALIGNED:\t%p\t%p\t%p\t%p\t%p\n",
+           b1, b2, a, b, samples);
+  }
+
+
+#ifdef ALTIVEC_USE_REFERENCE_C_CODE
+  
+  {
+    register real *costab = pnts[0];
+
+    b1[0x00] = samples[0x00] + samples[0x1F];
+    b1[0x01] = samples[0x01] + samples[0x1E];
+    b1[0x02] = samples[0x02] + samples[0x1D];
+    b1[0x03] = samples[0x03] + samples[0x1C];
+    b1[0x04] = samples[0x04] + samples[0x1B];
+    b1[0x05] = samples[0x05] + samples[0x1A];
+    b1[0x06] = samples[0x06] + samples[0x19];
+    b1[0x07] = samples[0x07] + samples[0x18];
+    b1[0x08] = samples[0x08] + samples[0x17];
+    b1[0x09] = samples[0x09] + samples[0x16];
+    b1[0x0A] = samples[0x0A] + samples[0x15];
+    b1[0x0B] = samples[0x0B] + samples[0x14];
+    b1[0x0C] = samples[0x0C] + samples[0x13];
+    b1[0x0D] = samples[0x0D] + samples[0x12];
+    b1[0x0E] = samples[0x0E] + samples[0x11];
+    b1[0x0F] = samples[0x0F] + samples[0x10];
+    b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF];
+    b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE];
+    b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD];
+    b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC];
+    b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB];
+    b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA];
+    b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9];
+    b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8];
+    b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7];
+    b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6];
+    b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5];
+    b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4];
+    b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3];
+    b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2];
+    b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1];
+    b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0];
+
+  }
+  {
+    register real *costab = pnts[1];
+
+    b2[0x00] = b1[0x00] + b1[0x0F];
+    b2[0x01] = b1[0x01] + b1[0x0E];
+    b2[0x02] = b1[0x02] + b1[0x0D];
+    b2[0x03] = b1[0x03] + b1[0x0C];
+    b2[0x04] = b1[0x04] + b1[0x0B];
+    b2[0x05] = b1[0x05] + b1[0x0A];
+    b2[0x06] = b1[0x06] + b1[0x09];
+    b2[0x07] = b1[0x07] + b1[0x08];
+    b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7];
+    b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6];
+    b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5];
+    b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4];
+    b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3];
+    b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2];
+    b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1];
+    b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0];
+    b2[0x10] = b1[0x10] + b1[0x1F];
+    b2[0x11] = b1[0x11] + b1[0x1E];
+    b2[0x12] = b1[0x12] + b1[0x1D];
+    b2[0x13] = b1[0x13] + b1[0x1C];
+    b2[0x14] = b1[0x14] + b1[0x1B];
+    b2[0x15] = b1[0x15] + b1[0x1A];
+    b2[0x16] = b1[0x16] + b1[0x19];
+    b2[0x17] = b1[0x17] + b1[0x18];
+    b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7];
+    b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6];
+    b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5];
+    b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4];
+    b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3];
+    b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2];
+    b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1];
+    b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0];
+
+  }
+
+  {
+    register real *costab = pnts[2];
+
+    b1[0x00] = b2[0x00] + b2[0x07];
+    b1[0x01] = b2[0x01] + b2[0x06];
+    b1[0x02] = b2[0x02] + b2[0x05];
+    b1[0x03] = b2[0x03] + b2[0x04];
+    b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3];
+    b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2];
+    b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1];
+    b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0];
+    b1[0x08] = b2[0x08] + b2[0x0F];
+    b1[0x09] = b2[0x09] + b2[0x0E];
+    b1[0x0A] = b2[0x0A] + b2[0x0D];
+    b1[0x0B] = b2[0x0B] + b2[0x0C];
+    b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3];
+    b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2];
+    b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1];
+    b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0];
+    b1[0x10] = b2[0x10] + b2[0x17];
+    b1[0x11] = b2[0x11] + b2[0x16];
+    b1[0x12] = b2[0x12] + b2[0x15];
+    b1[0x13] = b2[0x13] + b2[0x14];
+    b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3];
+    b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2];
+    b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1];
+    b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0];
+    b1[0x18] = b2[0x18] + b2[0x1F];
+    b1[0x19] = b2[0x19] + b2[0x1E];
+    b1[0x1A] = b2[0x1A] + b2[0x1D];
+    b1[0x1B] = b2[0x1B] + b2[0x1C];
+    b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3];
+    b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2];
+    b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1];
+    b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0];
+  }
+
+#else /* ALTIVEC_USE_REFERENCE_C_CODE */
+
+  // How does it work ?
+  // the first three passes are reproducted in the three block below
+  // all computations are done on a 4 elements vector
+  // 'reverse' is a special perumtation vector used to reverse
+  // the order of the elements inside a vector.
+  // note that all loads/stores to b1 (b2) between passes 1 and 2 (2 and 3)
+  // have been removed, all elements are stored inside b1vX (b2vX)
+  {
+    register vector float
+      b1v0, b1v1, b1v2, b1v3,
+      b1v4, b1v5, b1v6, b1v7;
+    register vector float
+      temp1, temp2;
+
+    {
+      register real *costab = pnts[0];
+
+      register vector float
+        samplesv1, samplesv2, samplesv3, samplesv4,
+        samplesv5, samplesv6, samplesv7, samplesv8,
+        samplesv9;
+      register vector unsigned char samples_perm = vec_lvsl(0, samples);
+      register vector float costabv1, costabv2, costabv3, costabv4, costabv5;
+      register vector unsigned char costab_perm = vec_lvsl(0, costab);
+
+      samplesv1 = vec_ld(0, samples);
+      samplesv2 = vec_ld(16, samples);
+      samplesv1 = vec_perm(samplesv1, samplesv2, samples_perm);
+      samplesv3 = vec_ld(32, samples);
+      samplesv2 = vec_perm(samplesv2, samplesv3, samples_perm);
+      samplesv4 = vec_ld(48, samples);
+      samplesv3 = vec_perm(samplesv3, samplesv4, samples_perm);
+      samplesv5 = vec_ld(64, samples);
+      samplesv4 = vec_perm(samplesv4, samplesv5, samples_perm);
+      samplesv6 = vec_ld(80, samples);
+      samplesv5 = vec_perm(samplesv5, samplesv6, samples_perm);
+      samplesv7 = vec_ld(96, samples);
+      samplesv6 = vec_perm(samplesv6, samplesv7, samples_perm);
+      samplesv8 = vec_ld(112, samples);
+      samplesv7 = vec_perm(samplesv7, samplesv8, samples_perm);
+      samplesv9 = vec_ld(128, samples);
+      samplesv8 = vec_perm(samplesv8, samplesv9, samples_perm);
+
+      temp1 = vec_add(samplesv1,
+                      vec_perm(samplesv8, samplesv8, reverse));
+      //vec_st(temp1, 0, b1);
+      b1v0 = temp1;
+      temp1 = vec_add(samplesv2,
+                      vec_perm(samplesv7, samplesv7, reverse));
+      //vec_st(temp1, 16, b1);
+      b1v1 = temp1;
+      temp1 = vec_add(samplesv3,
+                      vec_perm(samplesv6, samplesv6, reverse));
+      //vec_st(temp1, 32, b1);
+      b1v2 = temp1;
+      temp1 = vec_add(samplesv4,
+                      vec_perm(samplesv5, samplesv5, reverse));
+      //vec_st(temp1, 48, b1);
+      b1v3 = temp1;
+
+      costabv1 = vec_ld(0, costab);
+      costabv2 = vec_ld(16, costab);
+      costabv1 = vec_perm(costabv1, costabv2, costab_perm);
+      costabv3 = vec_ld(32, costab);
+      costabv2 = vec_perm(costabv2, costabv3, costab_perm);
+      costabv4 = vec_ld(48, costab);
+      costabv3 = vec_perm(costabv3, costabv4, costab_perm);
+      costabv5 = vec_ld(64, costab);
+      costabv4 = vec_perm(costabv4, costabv5, costab_perm);
+    
+      temp1 = vec_sub(vec_perm(samplesv4, samplesv4, reverse),
+                      samplesv5);
+      temp2 = vec_madd(temp1,
+                       vec_perm(costabv4, costabv4, reverse),
+                       vczero);
+      //vec_st(temp2, 64, b1);
+      b1v4 = temp2;
+    
+      temp1 = vec_sub(vec_perm(samplesv3, samplesv3, reverse),
+                      samplesv6);
+      temp2 = vec_madd(temp1,
+                       vec_perm(costabv3, costabv3, reverse),
+                       vczero);
+      //vec_st(temp2, 80, b1);
+      b1v5 = temp2;
+      temp1 = vec_sub(vec_perm(samplesv2, samplesv2, reverse),
+                      samplesv7);
+      temp2 = vec_madd(temp1,
+                       vec_perm(costabv2, costabv2, reverse),
+                       vczero);
+      //vec_st(temp2, 96, b1);
+      b1v6 = temp2;
+    
+      temp1 = vec_sub(vec_perm(samplesv1, samplesv1, reverse),
+                      samplesv8);
+      temp2 = vec_madd(temp1,
+                       vec_perm(costabv1, costabv1, reverse),
+                       vczero);
+      //vec_st(temp2, 112, b1);
+      b1v7 = temp2;
+
+    }
+
+    {
+      register vector float
+        b2v0, b2v1, b2v2, b2v3,
+        b2v4, b2v5, b2v6, b2v7;
+      {
+        register real *costab = pnts[1];
+        register vector float costabv1r, costabv2r, costabv1, costabv2, costabv3;
+        register vector unsigned char costab_perm = vec_lvsl(0, costab);
+
+        costabv1 = vec_ld(0, costab);
+        costabv2 = vec_ld(16, costab);
+        costabv1 = vec_perm(costabv1, costabv2, costab_perm);
+        costabv3  = vec_ld(32, costab);
+        costabv2 = vec_perm(costabv2, costabv3 , costab_perm);
+        costabv1r = vec_perm(costabv1, costabv1, reverse);
+        costabv2r = vec_perm(costabv2, costabv2, reverse);
+    
+        temp1 = vec_add(b1v0, vec_perm(b1v3, b1v3, reverse));
+        //vec_st(temp1, 0, b2);
+        b2v0 = temp1;
+        temp1 = vec_add(b1v1, vec_perm(b1v2, b1v2, reverse));
+        //vec_st(temp1, 16, b2);
+        b2v1 = temp1;
+        temp2 = vec_sub(vec_perm(b1v1, b1v1, reverse), b1v2);
+        temp1 = vec_madd(temp2, costabv2r, vczero);
+        //vec_st(temp1, 32, b2);
+        b2v2 = temp1;
+        temp2 = vec_sub(vec_perm(b1v0, b1v0, reverse), b1v3);
+        temp1 = vec_madd(temp2, costabv1r, vczero);
+        //vec_st(temp1, 48, b2);
+        b2v3 = temp1;
+        temp1 = vec_add(b1v4, vec_perm(b1v7, b1v7, reverse));
+        //vec_st(temp1, 64, b2);
+        b2v4 = temp1;
+        temp1 = vec_add(b1v5, vec_perm(b1v6, b1v6, reverse));
+        //vec_st(temp1, 80, b2);
+        b2v5 = temp1;
+        temp2 = vec_sub(b1v6, vec_perm(b1v5, b1v5, reverse));
+        temp1 = vec_madd(temp2, costabv2r, vczero);
+        //vec_st(temp1, 96, b2);
+        b2v6 = temp1;
+        temp2 = vec_sub(b1v7, vec_perm(b1v4, b1v4, reverse));
+        temp1 = vec_madd(temp2, costabv1r, vczero);
+        //vec_st(temp1, 112, b2);
+        b2v7 = temp1;
+      }
+
+      {
+        register real *costab = pnts[2];
+
+    
+        vector float costabv1r, costabv1, costabv2;
+        vector unsigned char costab_perm = vec_lvsl(0, costab);
+
+        costabv1 = vec_ld(0, costab);
+        costabv2 = vec_ld(16, costab);
+        costabv1 = vec_perm(costabv1, costabv2, costab_perm);
+        costabv1r = vec_perm(costabv1, costabv1, reverse);
+    
+        temp1 = vec_add(b2v0, vec_perm(b2v1, b2v1, reverse));
+        vec_st(temp1, 0, b1);
+        temp2 = vec_sub(vec_perm(b2v0, b2v0, reverse), b2v1);
+        temp1 = vec_madd(temp2, costabv1r, vczero);
+        vec_st(temp1, 16, b1);
+    
+        temp1 = vec_add(b2v2, vec_perm(b2v3, b2v3, reverse));
+        vec_st(temp1, 32, b1);
+        temp2 = vec_sub(b2v3, vec_perm(b2v2, b2v2, reverse));
+        temp1 = vec_madd(temp2, costabv1r, vczero);
+        vec_st(temp1, 48, b1);
+
+        temp1 = vec_add(b2v4, vec_perm(b2v5, b2v5, reverse));
+        vec_st(temp1, 64, b1);
+        temp2 = vec_sub(vec_perm(b2v4, b2v4, reverse), b2v5);
+        temp1 = vec_madd(temp2, costabv1r, vczero);
+        vec_st(temp1, 80, b1);
+
+        temp1 = vec_add(b2v6, vec_perm(b2v7, b2v7, reverse));
+        vec_st(temp1, 96, b1);
+        temp2 = vec_sub(b2v7, vec_perm(b2v6, b2v6, reverse));
+        temp1 = vec_madd(temp2, costabv1r, vczero);
+        vec_st(temp1, 112, b1);
+    
+      }
+    }
+  }
+
+#endif /* ALTIVEC_USE_REFERENCE_C_CODE */
+
+  {
+    register real const cos0 = pnts[3][0];
+    register real const cos1 = pnts[3][1];
+
+    b2[0x00] = b1[0x00] + b1[0x03];
+    b2[0x01] = b1[0x01] + b1[0x02];
+    b2[0x02] = (b1[0x01] - b1[0x02]) * cos1;
+    b2[0x03] = (b1[0x00] - b1[0x03]) * cos0;
+    b2[0x04] = b1[0x04] + b1[0x07];
+    b2[0x05] = b1[0x05] + b1[0x06];
+    b2[0x06] = (b1[0x06] - b1[0x05]) * cos1;
+    b2[0x07] = (b1[0x07] - b1[0x04]) * cos0;
+    b2[0x08] = b1[0x08] + b1[0x0B];
+    b2[0x09] = b1[0x09] + b1[0x0A];
+    b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1;
+    b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0;
+    b2[0x0C] = b1[0x0C] + b1[0x0F];
+    b2[0x0D] = b1[0x0D] + b1[0x0E];
+    b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1;
+    b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0;
+    b2[0x10] = b1[0x10] + b1[0x13];
+    b2[0x11] = b1[0x11] + b1[0x12];
+    b2[0x12] = (b1[0x11] - b1[0x12]) * cos1;
+    b2[0x13] = (b1[0x10] - b1[0x13]) * cos0;
+    b2[0x14] = b1[0x14] + b1[0x17];
+    b2[0x15] = b1[0x15] + b1[0x16];
+    b2[0x16] = (b1[0x16] - b1[0x15]) * cos1;
+    b2[0x17] = (b1[0x17] - b1[0x14]) * cos0;
+    b2[0x18] = b1[0x18] + b1[0x1B];
+    b2[0x19] = b1[0x19] + b1[0x1A];
+    b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1;
+    b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0;
+    b2[0x1C] = b1[0x1C] + b1[0x1F];
+    b2[0x1D] = b1[0x1D] + b1[0x1E];
+    b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1;
+    b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0;
+  }
+
+  {
+    register real const cos0 = pnts[4][0];
+
+    b1[0x00] = b2[0x00] + b2[0x01];
+    b1[0x01] = (b2[0x00] - b2[0x01]) * cos0;
+    b1[0x02] = b2[0x02] + b2[0x03];
+    b1[0x03] = (b2[0x03] - b2[0x02]) * cos0;
+    b1[0x02] += b1[0x03];
+
+    b1[0x04] = b2[0x04] + b2[0x05];
+    b1[0x05] = (b2[0x04] - b2[0x05]) * cos0;
+    b1[0x06] = b2[0x06] + b2[0x07];
+    b1[0x07] = (b2[0x07] - b2[0x06]) * cos0;
+    b1[0x06] += b1[0x07];
+    b1[0x04] += b1[0x06];
+    b1[0x06] += b1[0x05];
+    b1[0x05] += b1[0x07];
+
+    b1[0x08] = b2[0x08] + b2[0x09];
+    b1[0x09] = (b2[0x08] - b2[0x09]) * cos0;
+    b1[0x0A] = b2[0x0A] + b2[0x0B];
+    b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0;
+    b1[0x0A] += b1[0x0B];
+
+    b1[0x0C] = b2[0x0C] + b2[0x0D];
+    b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0;
+    b1[0x0E] = b2[0x0E] + b2[0x0F];
+    b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0;
+    b1[0x0E] += b1[0x0F];
+    b1[0x0C] += b1[0x0E];
+    b1[0x0E] += b1[0x0D];
+    b1[0x0D] += b1[0x0F];
+
+    b1[0x10] = b2[0x10] + b2[0x11];
+    b1[0x11] = (b2[0x10] - b2[0x11]) * cos0;
+    b1[0x12] = b2[0x12] + b2[0x13];
+    b1[0x13] = (b2[0x13] - b2[0x12]) * cos0;
+    b1[0x12] += b1[0x13];
+
+    b1[0x14] = b2[0x14] + b2[0x15];
+    b1[0x15] = (b2[0x14] - b2[0x15]) * cos0;
+    b1[0x16] = b2[0x16] + b2[0x17];
+    b1[0x17] = (b2[0x17] - b2[0x16]) * cos0;
+    b1[0x16] += b1[0x17];
+    b1[0x14] += b1[0x16];
+    b1[0x16] += b1[0x15];
+    b1[0x15] += b1[0x17];
+
+    b1[0x18] = b2[0x18] + b2[0x19];
+    b1[0x19] = (b2[0x18] - b2[0x19]) * cos0;
+    b1[0x1A] = b2[0x1A] + b2[0x1B];
+    b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0;
+    b1[0x1A] += b1[0x1B];
+
+    b1[0x1C] = b2[0x1C] + b2[0x1D];
+    b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0;
+    b1[0x1E] = b2[0x1E] + b2[0x1F];
+    b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0;
+    b1[0x1E] += b1[0x1F];
+    b1[0x1C] += b1[0x1E];
+    b1[0x1E] += b1[0x1D];
+    b1[0x1D] += b1[0x1F];
+  }
+
+  out0[0x10*16] = b1[0x00];
+  out0[0x10*12] = b1[0x04];
+  out0[0x10* 8] = b1[0x02];
+  out0[0x10* 4] = b1[0x06];
+  out0[0x10* 0] = b1[0x01];
+  out1[0x10* 0] = b1[0x01];
+  out1[0x10* 4] = b1[0x05];
+  out1[0x10* 8] = b1[0x03];
+  out1[0x10*12] = b1[0x07];
+
+  b1[0x08] += b1[0x0C];
+  out0[0x10*14] = b1[0x08];
+  b1[0x0C] += b1[0x0a];
+  out0[0x10*10] = b1[0x0C];
+  b1[0x0A] += b1[0x0E];
+  out0[0x10* 6] = b1[0x0A];
+  b1[0x0E] += b1[0x09];
+  out0[0x10* 2] = b1[0x0E];
+  b1[0x09] += b1[0x0D];
+  out1[0x10* 2] = b1[0x09];
+  b1[0x0D] += b1[0x0B];
+  out1[0x10* 6] = b1[0x0D];
+  b1[0x0B] += b1[0x0F];
+  out1[0x10*10] = b1[0x0B];
+  out1[0x10*14] = b1[0x0F];
+
+  b1[0x18] += b1[0x1C];
+  out0[0x10*15] = b1[0x10] + b1[0x18];
+  out0[0x10*13] = b1[0x18] + b1[0x14];
+  b1[0x1C] += b1[0x1a];
+  out0[0x10*11] = b1[0x14] + b1[0x1C];
+  out0[0x10* 9] = b1[0x1C] + b1[0x12];
+  b1[0x1A] += b1[0x1E];
+  out0[0x10* 7] = b1[0x12] + b1[0x1A];
+  out0[0x10* 5] = b1[0x1A] + b1[0x16];
+  b1[0x1E] += b1[0x19];
+  out0[0x10* 3] = b1[0x16] + b1[0x1E];
+  out0[0x10* 1] = b1[0x1E] + b1[0x11];
+  b1[0x19] += b1[0x1D];
+  out1[0x10* 1] = b1[0x11] + b1[0x19];
+  out1[0x10* 3] = b1[0x19] + b1[0x15];
+  b1[0x1D] += b1[0x1B];
+  out1[0x10* 5] = b1[0x15] + b1[0x1D];
+  out1[0x10* 7] = b1[0x1D] + b1[0x13];
+  b1[0x1B] += b1[0x1F];
+  out1[0x10* 9] = b1[0x13] + b1[0x1B];
+  out1[0x10*11] = b1[0x1B] + b1[0x17];
+  out1[0x10*13] = b1[0x17] + b1[0x1F];
+  out1[0x10*15] = b1[0x1F];
+}
+
+#endif HAVE_ALTIVEC
+
diff --git a/mp3lib/decod386.c b/mp3lib/decod386.c
index c76d3bb843..7739cdb8d1 100644
--- a/mp3lib/decod386.c
+++ b/mp3lib/decod386.c
@@ -158,6 +158,13 @@ int synth_1to1_MMX( real *bandPtr,int channel,short * samples)
     return 0;
 } 
 #endif
+
+#ifdef HAVE_ALTIVEC
+#define dct64_base(a,b,c) if(gCpuCaps.hasAltiVec) dct64_altivec(a,b,c); else dct64(a,b,c)
+#else /* HAVE_ALTIVEC */
+#define dct64_base(a,b,c) dct64(a,b,c)
+#endif /* HAVE_ALTIVEC */
+ 
 static int synth_1to1(real *bandPtr,int channel,unsigned char *out,int *pnt)
 {
   static real buffs[2][2][0x110];
@@ -192,12 +199,12 @@ static int synth_1to1(real *bandPtr,int channel,unsigned char *out,int *pnt)
   if(bo & 0x1) {
     b0 = buf[0];
     bo1 = bo;
-    dct64(buf[1]+((bo+1)&0xf),buf[0]+bo,bandPtr);
+    dct64_base(buf[1]+((bo+1)&0xf),buf[0]+bo,bandPtr);
   }
   else {
     b0 = buf[1];
     bo1 = bo+1;
-    dct64(buf[0]+bo,buf[1]+bo+1,bandPtr);
+    dct64_base(buf[0]+bo,buf[1]+bo+1,bandPtr);
   }
 
   {