Merge "Arrange 1D forward transform order in vp9_dct.c"

1 files changed, 488 insertions, 496 deletions

diff --git a/vp9/encoder/vp9_dct.c b/vp9/encoder/vp9_dct.c
index b7b49731c..51705414d 100644
--- a/vp9/encoder/vp9_dct.c
+++ b/vp9/encoder/vp9_dct.c
@@ -20,34 +20,6 @@
 #include "vp9/common/vp9_systemdependent.h"
 #include "vp9/encoder/vp9_dct.h"
 
-static void fdct4(const tran_low_t *input, tran_low_t *output);
-static void fadst4(const tran_low_t *input, tran_low_t *output);
-static void fdct8(const tran_low_t *input, tran_low_t *output);
-static void fadst8(const tran_low_t *input, tran_low_t *output);
-static void fdct16(const tran_low_t in[16], tran_low_t out[16]);
-static void fadst16(const tran_low_t *input, tran_low_t *output);
-
-static const transform_2d FHT_4[] = {
-  { fdct4,  fdct4  },  // DCT_DCT  = 0
-  { fadst4, fdct4  },  // ADST_DCT = 1
-  { fdct4,  fadst4 },  // DCT_ADST = 2
-  { fadst4, fadst4 }   // ADST_ADST = 3
-};
-
-static const transform_2d FHT_8[] = {
-  { fdct8,  fdct8  },  // DCT_DCT  = 0
-  { fadst8, fdct8  },  // ADST_DCT = 1
-  { fdct8,  fadst8 },  // DCT_ADST = 2
-  { fadst8, fadst8 }   // ADST_ADST = 3
-};
-
-static const transform_2d FHT_16[] = {
-  { fdct16,  fdct16  },  // DCT_DCT  = 0
-  { fadst16, fdct16  },  // ADST_DCT = 1
-  { fdct16,  fadst16 },  // DCT_ADST = 2
-  { fadst16, fadst16 }   // ADST_ADST = 3
-};
-
 static INLINE tran_high_t fdct_round_shift(tran_high_t input) {
   tran_high_t rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
   // TODO(debargha, peter.derivaz): Find new bounds for this assert
@@ -75,6 +47,494 @@ static void fdct4(const tran_low_t *input, tran_low_t *output) {
   output[3] = (tran_low_t)fdct_round_shift(temp2);
 }
 
+static void fdct8(const tran_low_t *input, tran_low_t *output) {
+  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;  // canbe16
+  tran_high_t t0, t1, t2, t3;                  // needs32
+  tran_high_t x0, x1, x2, x3;                  // canbe16
+
+  // stage 1
+  s0 = input[0] + input[7];
+  s1 = input[1] + input[6];
+  s2 = input[2] + input[5];
+  s3 = input[3] + input[4];
+  s4 = input[3] - input[4];
+  s5 = input[2] - input[5];
+  s6 = input[1] - input[6];
+  s7 = input[0] - input[7];
+
+  // fdct4(step, step);
+  x0 = s0 + s3;
+  x1 = s1 + s2;
+  x2 = s1 - s2;
+  x3 = s0 - s3;
+  t0 = (x0 + x1) * cospi_16_64;
+  t1 = (x0 - x1) * cospi_16_64;
+  t2 =  x2 * cospi_24_64 + x3 *  cospi_8_64;
+  t3 = -x2 * cospi_8_64  + x3 * cospi_24_64;
+  output[0] = (tran_low_t)fdct_round_shift(t0);
+  output[2] = (tran_low_t)fdct_round_shift(t2);
+  output[4] = (tran_low_t)fdct_round_shift(t1);
+  output[6] = (tran_low_t)fdct_round_shift(t3);
+
+  // Stage 2
+  t0 = (s6 - s5) * cospi_16_64;
+  t1 = (s6 + s5) * cospi_16_64;
+  t2 = (tran_low_t)fdct_round_shift(t0);
+  t3 = (tran_low_t)fdct_round_shift(t1);
+
+  // Stage 3
+  x0 = s4 + t2;
+  x1 = s4 - t2;
+  x2 = s7 - t3;
+  x3 = s7 + t3;
+
+  // Stage 4
+  t0 = x0 * cospi_28_64 + x3 *   cospi_4_64;
+  t1 = x1 * cospi_12_64 + x2 *  cospi_20_64;
+  t2 = x2 * cospi_12_64 + x1 * -cospi_20_64;
+  t3 = x3 * cospi_28_64 + x0 *  -cospi_4_64;
+  output[1] = (tran_low_t)fdct_round_shift(t0);
+  output[3] = (tran_low_t)fdct_round_shift(t2);
+  output[5] = (tran_low_t)fdct_round_shift(t1);
+  output[7] = (tran_low_t)fdct_round_shift(t3);
+}
+
+static void fdct16(const tran_low_t in[16], tran_low_t out[16]) {
+  tran_high_t step1[8];      // canbe16
+  tran_high_t step2[8];      // canbe16
+  tran_high_t step3[8];      // canbe16
+  tran_high_t input[8];      // canbe16
+  tran_high_t temp1, temp2;  // needs32
+
+  // step 1
+  input[0] = in[0] + in[15];
+  input[1] = in[1] + in[14];
+  input[2] = in[2] + in[13];
+  input[3] = in[3] + in[12];
+  input[4] = in[4] + in[11];
+  input[5] = in[5] + in[10];
+  input[6] = in[6] + in[ 9];
+  input[7] = in[7] + in[ 8];
+
+  step1[0] = in[7] - in[ 8];
+  step1[1] = in[6] - in[ 9];
+  step1[2] = in[5] - in[10];
+  step1[3] = in[4] - in[11];
+  step1[4] = in[3] - in[12];
+  step1[5] = in[2] - in[13];
+  step1[6] = in[1] - in[14];
+  step1[7] = in[0] - in[15];
+
+  // fdct8(step, step);
+  {
+    tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;  // canbe16
+    tran_high_t t0, t1, t2, t3;                  // needs32
+    tran_high_t x0, x1, x2, x3;                  // canbe16
+
+    // stage 1
+    s0 = input[0] + input[7];
+    s1 = input[1] + input[6];
+    s2 = input[2] + input[5];
+    s3 = input[3] + input[4];
+    s4 = input[3] - input[4];
+    s5 = input[2] - input[5];
+    s6 = input[1] - input[6];
+    s7 = input[0] - input[7];
+
+    // fdct4(step, step);
+    x0 = s0 + s3;
+    x1 = s1 + s2;
+    x2 = s1 - s2;
+    x3 = s0 - s3;
+    t0 = (x0 + x1) * cospi_16_64;
+    t1 = (x0 - x1) * cospi_16_64;
+    t2 = x3 * cospi_8_64  + x2 * cospi_24_64;
+    t3 = x3 * cospi_24_64 - x2 * cospi_8_64;
+    out[0] = (tran_low_t)fdct_round_shift(t0);
+    out[4] = (tran_low_t)fdct_round_shift(t2);
+    out[8] = (tran_low_t)fdct_round_shift(t1);
+    out[12] = (tran_low_t)fdct_round_shift(t3);
+
+    // Stage 2
+    t0 = (s6 - s5) * cospi_16_64;
+    t1 = (s6 + s5) * cospi_16_64;
+    t2 = fdct_round_shift(t0);
+    t3 = fdct_round_shift(t1);
+
+    // Stage 3
+    x0 = s4 + t2;
+    x1 = s4 - t2;
+    x2 = s7 - t3;
+    x3 = s7 + t3;
+
+    // Stage 4
+    t0 = x0 * cospi_28_64 + x3 *   cospi_4_64;
+    t1 = x1 * cospi_12_64 + x2 *  cospi_20_64;
+    t2 = x2 * cospi_12_64 + x1 * -cospi_20_64;
+    t3 = x3 * cospi_28_64 + x0 *  -cospi_4_64;
+    out[2] = (tran_low_t)fdct_round_shift(t0);
+    out[6] = (tran_low_t)fdct_round_shift(t2);
+    out[10] = (tran_low_t)fdct_round_shift(t1);
+    out[14] = (tran_low_t)fdct_round_shift(t3);
+  }
+
+  // step 2
+  temp1 = (step1[5] - step1[2]) * cospi_16_64;
+  temp2 = (step1[4] - step1[3]) * cospi_16_64;
+  step2[2] = fdct_round_shift(temp1);
+  step2[3] = fdct_round_shift(temp2);
+  temp1 = (step1[4] + step1[3]) * cospi_16_64;
+  temp2 = (step1[5] + step1[2]) * cospi_16_64;
+  step2[4] = fdct_round_shift(temp1);
+  step2[5] = fdct_round_shift(temp2);
+
+  // step 3
+  step3[0] = step1[0] + step2[3];
+  step3[1] = step1[1] + step2[2];
+  step3[2] = step1[1] - step2[2];
+  step3[3] = step1[0] - step2[3];
+  step3[4] = step1[7] - step2[4];
+  step3[5] = step1[6] - step2[5];
+  step3[6] = step1[6] + step2[5];
+  step3[7] = step1[7] + step2[4];
+
+  // step 4
+  temp1 = step3[1] *  -cospi_8_64 + step3[6] * cospi_24_64;
+  temp2 = step3[2] * cospi_24_64 + step3[5] *  cospi_8_64;
+  step2[1] = fdct_round_shift(temp1);
+  step2[2] = fdct_round_shift(temp2);
+  temp1 = step3[2] * cospi_8_64 - step3[5] * cospi_24_64;
+  temp2 = step3[1] * cospi_24_64 + step3[6] *  cospi_8_64;
+  step2[5] = fdct_round_shift(temp1);
+  step2[6] = fdct_round_shift(temp2);
+
+  // step 5
+  step1[0] = step3[0] + step2[1];
+  step1[1] = step3[0] - step2[1];
+  step1[2] = step3[3] + step2[2];
+  step1[3] = step3[3] - step2[2];
+  step1[4] = step3[4] - step2[5];
+  step1[5] = step3[4] + step2[5];
+  step1[6] = step3[7] - step2[6];
+  step1[7] = step3[7] + step2[6];
+
+  // step 6
+  temp1 = step1[0] * cospi_30_64 + step1[7] *  cospi_2_64;
+  temp2 = step1[1] * cospi_14_64 + step1[6] * cospi_18_64;
+  out[1] = (tran_low_t)fdct_round_shift(temp1);
+  out[9] = (tran_low_t)fdct_round_shift(temp2);
+
+  temp1 = step1[2] * cospi_22_64 + step1[5] * cospi_10_64;
+  temp2 = step1[3] *  cospi_6_64 + step1[4] * cospi_26_64;
+  out[5] = (tran_low_t)fdct_round_shift(temp1);
+  out[13] = (tran_low_t)fdct_round_shift(temp2);
+
+  temp1 = step1[3] * -cospi_26_64 + step1[4] *  cospi_6_64;
+  temp2 = step1[2] * -cospi_10_64 + step1[5] * cospi_22_64;
+  out[3] = (tran_low_t)fdct_round_shift(temp1);
+  out[11] = (tran_low_t)fdct_round_shift(temp2);
+
+  temp1 = step1[1] * -cospi_18_64 + step1[6] * cospi_14_64;
+  temp2 = step1[0] *  -cospi_2_64 + step1[7] * cospi_30_64;
+  out[7] = (tran_low_t)fdct_round_shift(temp1);
+  out[15] = (tran_low_t)fdct_round_shift(temp2);
+}
+
+static void fadst4(const tran_low_t *input, tran_low_t *output) {
+  tran_high_t x0, x1, x2, x3;
+  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;
+
+  x0 = input[0];
+  x1 = input[1];
+  x2 = input[2];
+  x3 = input[3];
+
+  if (!(x0 | x1 | x2 | x3)) {
+    output[0] = output[1] = output[2] = output[3] = 0;
+    return;
+  }
+
+  s0 = sinpi_1_9 * x0;
+  s1 = sinpi_4_9 * x0;
+  s2 = sinpi_2_9 * x1;
+  s3 = sinpi_1_9 * x1;
+  s4 = sinpi_3_9 * x2;
+  s5 = sinpi_4_9 * x3;
+  s6 = sinpi_2_9 * x3;
+  s7 = x0 + x1 - x3;
+
+  x0 = s0 + s2 + s5;
+  x1 = sinpi_3_9 * s7;
+  x2 = s1 - s3 + s6;
+  x3 = s4;
+
+  s0 = x0 + x3;
+  s1 = x1;
+  s2 = x2 - x3;
+  s3 = x2 - x0 + x3;
+
+  // 1-D transform scaling factor is sqrt(2).
+  output[0] = (tran_low_t)fdct_round_shift(s0);
+  output[1] = (tran_low_t)fdct_round_shift(s1);
+  output[2] = (tran_low_t)fdct_round_shift(s2);
+  output[3] = (tran_low_t)fdct_round_shift(s3);
+}
+
+static void fadst8(const tran_low_t *input, tran_low_t *output) {
+  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;
+
+  tran_high_t x0 = input[7];
+  tran_high_t x1 = input[0];
+  tran_high_t x2 = input[5];
+  tran_high_t x3 = input[2];
+  tran_high_t x4 = input[3];
+  tran_high_t x5 = input[4];
+  tran_high_t x6 = input[1];
+  tran_high_t x7 = input[6];
+
+  // stage 1
+  s0 = cospi_2_64  * x0 + cospi_30_64 * x1;
+  s1 = cospi_30_64 * x0 - cospi_2_64  * x1;
+  s2 = cospi_10_64 * x2 + cospi_22_64 * x3;
+  s3 = cospi_22_64 * x2 - cospi_10_64 * x3;
+  s4 = cospi_18_64 * x4 + cospi_14_64 * x5;
+  s5 = cospi_14_64 * x4 - cospi_18_64 * x5;
+  s6 = cospi_26_64 * x6 + cospi_6_64  * x7;
+  s7 = cospi_6_64  * x6 - cospi_26_64 * x7;
+
+  x0 = fdct_round_shift(s0 + s4);
+  x1 = fdct_round_shift(s1 + s5);
+  x2 = fdct_round_shift(s2 + s6);
+  x3 = fdct_round_shift(s3 + s7);
+  x4 = fdct_round_shift(s0 - s4);
+  x5 = fdct_round_shift(s1 - s5);
+  x6 = fdct_round_shift(s2 - s6);
+  x7 = fdct_round_shift(s3 - s7);
+
+  // stage 2
+  s0 = x0;
+  s1 = x1;
+  s2 = x2;
+  s3 = x3;
+  s4 = cospi_8_64  * x4 + cospi_24_64 * x5;
+  s5 = cospi_24_64 * x4 - cospi_8_64  * x5;
+  s6 = - cospi_24_64 * x6 + cospi_8_64  * x7;
+  s7 =   cospi_8_64  * x6 + cospi_24_64 * x7;
+
+  x0 = s0 + s2;
+  x1 = s1 + s3;
+  x2 = s0 - s2;
+  x3 = s1 - s3;
+  x4 = fdct_round_shift(s4 + s6);
+  x5 = fdct_round_shift(s5 + s7);
+  x6 = fdct_round_shift(s4 - s6);
+  x7 = fdct_round_shift(s5 - s7);
+
+  // stage 3
+  s2 = cospi_16_64 * (x2 + x3);
+  s3 = cospi_16_64 * (x2 - x3);
+  s6 = cospi_16_64 * (x6 + x7);
+  s7 = cospi_16_64 * (x6 - x7);
+
+  x2 = fdct_round_shift(s2);
+  x3 = fdct_round_shift(s3);
+  x6 = fdct_round_shift(s6);
+  x7 = fdct_round_shift(s7);
+
+  output[0] = (tran_low_t)x0;
+  output[1] = (tran_low_t)-x4;
+  output[2] = (tran_low_t)x6;
+  output[3] = (tran_low_t)-x2;
+  output[4] = (tran_low_t)x3;
+  output[5] = (tran_low_t)-x7;
+  output[6] = (tran_low_t)x5;
+  output[7] = (tran_low_t)-x1;
+}
+
+static void fadst16(const tran_low_t *input, tran_low_t *output) {
+  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7, s8;
+  tran_high_t s9, s10, s11, s12, s13, s14, s15;
+
+  tran_high_t x0 = input[15];
+  tran_high_t x1 = input[0];
+  tran_high_t x2 = input[13];
+  tran_high_t x3 = input[2];
+  tran_high_t x4 = input[11];
+  tran_high_t x5 = input[4];
+  tran_high_t x6 = input[9];
+  tran_high_t x7 = input[6];
+  tran_high_t x8 = input[7];
+  tran_high_t x9 = input[8];
+  tran_high_t x10 = input[5];
+  tran_high_t x11 = input[10];
+  tran_high_t x12 = input[3];
+  tran_high_t x13 = input[12];
+  tran_high_t x14 = input[1];
+  tran_high_t x15 = input[14];
+
+  // stage 1
+  s0 = x0 * cospi_1_64  + x1 * cospi_31_64;
+  s1 = x0 * cospi_31_64 - x1 * cospi_1_64;
+  s2 = x2 * cospi_5_64  + x3 * cospi_27_64;
+  s3 = x2 * cospi_27_64 - x3 * cospi_5_64;
+  s4 = x4 * cospi_9_64  + x5 * cospi_23_64;
+  s5 = x4 * cospi_23_64 - x5 * cospi_9_64;
+  s6 = x6 * cospi_13_64 + x7 * cospi_19_64;
+  s7 = x6 * cospi_19_64 - x7 * cospi_13_64;
+  s8 = x8 * cospi_17_64 + x9 * cospi_15_64;
+  s9 = x8 * cospi_15_64 - x9 * cospi_17_64;
+  s10 = x10 * cospi_21_64 + x11 * cospi_11_64;
+  s11 = x10 * cospi_11_64 - x11 * cospi_21_64;
+  s12 = x12 * cospi_25_64 + x13 * cospi_7_64;
+  s13 = x12 * cospi_7_64  - x13 * cospi_25_64;
+  s14 = x14 * cospi_29_64 + x15 * cospi_3_64;
+  s15 = x14 * cospi_3_64  - x15 * cospi_29_64;
+
+  x0 = fdct_round_shift(s0 + s8);
+  x1 = fdct_round_shift(s1 + s9);
+  x2 = fdct_round_shift(s2 + s10);
+  x3 = fdct_round_shift(s3 + s11);
+  x4 = fdct_round_shift(s4 + s12);
+  x5 = fdct_round_shift(s5 + s13);
+  x6 = fdct_round_shift(s6 + s14);
+  x7 = fdct_round_shift(s7 + s15);
+  x8  = fdct_round_shift(s0 - s8);
+  x9  = fdct_round_shift(s1 - s9);
+  x10 = fdct_round_shift(s2 - s10);
+  x11 = fdct_round_shift(s3 - s11);
+  x12 = fdct_round_shift(s4 - s12);
+  x13 = fdct_round_shift(s5 - s13);
+  x14 = fdct_round_shift(s6 - s14);
+  x15 = fdct_round_shift(s7 - s15);
+
+  // stage 2
+  s0 = x0;
+  s1 = x1;
+  s2 = x2;
+  s3 = x3;
+  s4 = x4;
+  s5 = x5;
+  s6 = x6;
+  s7 = x7;
+  s8 =    x8 * cospi_4_64   + x9 * cospi_28_64;
+  s9 =    x8 * cospi_28_64  - x9 * cospi_4_64;
+  s10 =   x10 * cospi_20_64 + x11 * cospi_12_64;
+  s11 =   x10 * cospi_12_64 - x11 * cospi_20_64;
+  s12 = - x12 * cospi_28_64 + x13 * cospi_4_64;
+  s13 =   x12 * cospi_4_64  + x13 * cospi_28_64;
+  s14 = - x14 * cospi_12_64 + x15 * cospi_20_64;
+  s15 =   x14 * cospi_20_64 + x15 * cospi_12_64;
+
+  x0 = s0 + s4;
+  x1 = s1 + s5;
+  x2 = s2 + s6;
+  x3 = s3 + s7;
+  x4 = s0 - s4;
+  x5 = s1 - s5;
+  x6 = s2 - s6;
+  x7 = s3 - s7;
+  x8 = fdct_round_shift(s8 + s12);
+  x9 = fdct_round_shift(s9 + s13);
+  x10 = fdct_round_shift(s10 + s14);
+  x11 = fdct_round_shift(s11 + s15);
+  x12 = fdct_round_shift(s8 - s12);
+  x13 = fdct_round_shift(s9 - s13);
+  x14 = fdct_round_shift(s10 - s14);
+  x15 = fdct_round_shift(s11 - s15);
+
+  // stage 3
+  s0 = x0;
+  s1 = x1;
+  s2 = x2;
+  s3 = x3;
+  s4 = x4 * cospi_8_64  + x5 * cospi_24_64;
+  s5 = x4 * cospi_24_64 - x5 * cospi_8_64;
+  s6 = - x6 * cospi_24_64 + x7 * cospi_8_64;
+  s7 =   x6 * cospi_8_64  + x7 * cospi_24_64;
+  s8 = x8;
+  s9 = x9;
+  s10 = x10;
+  s11 = x11;
+  s12 = x12 * cospi_8_64  + x13 * cospi_24_64;
+  s13 = x12 * cospi_24_64 - x13 * cospi_8_64;
+  s14 = - x14 * cospi_24_64 + x15 * cospi_8_64;
+  s15 =   x14 * cospi_8_64  + x15 * cospi_24_64;
+
+  x0 = s0 + s2;
+  x1 = s1 + s3;
+  x2 = s0 - s2;
+  x3 = s1 - s3;
+  x4 = fdct_round_shift(s4 + s6);
+  x5 = fdct_round_shift(s5 + s7);
+  x6 = fdct_round_shift(s4 - s6);
+  x7 = fdct_round_shift(s5 - s7);
+  x8 = s8 + s10;
+  x9 = s9 + s11;
+  x10 = s8 - s10;
+  x11 = s9 - s11;
+  x12 = fdct_round_shift(s12 + s14);
+  x13 = fdct_round_shift(s13 + s15);
+  x14 = fdct_round_shift(s12 - s14);
+  x15 = fdct_round_shift(s13 - s15);
+
+  // stage 4
+  s2 = (- cospi_16_64) * (x2 + x3);
+  s3 = cospi_16_64 * (x2 - x3);
+  s6 = cospi_16_64 * (x6 + x7);
+  s7 = cospi_16_64 * (- x6 + x7);
+  s10 = cospi_16_64 * (x10 + x11);
+  s11 = cospi_16_64 * (- x10 + x11);
+  s14 = (- cospi_16_64) * (x14 + x15);
+  s15 = cospi_16_64 * (x14 - x15);
+
+  x2 = fdct_round_shift(s2);
+  x3 = fdct_round_shift(s3);
+  x6 = fdct_round_shift(s6);
+  x7 = fdct_round_shift(s7);
+  x10 = fdct_round_shift(s10);
+  x11 = fdct_round_shift(s11);
+  x14 = fdct_round_shift(s14);
+  x15 = fdct_round_shift(s15);
+
+  output[0] = (tran_low_t)x0;
+  output[1] = (tran_low_t)-x8;
+  output[2] = (tran_low_t)x12;
+  output[3] = (tran_low_t)-x4;
+  output[4] = (tran_low_t)x6;
+  output[5] = (tran_low_t)x14;
+  output[6] = (tran_low_t)x10;
+  output[7] = (tran_low_t)x2;
+  output[8] = (tran_low_t)x3;
+  output[9] = (tran_low_t)x11;
+  output[10] = (tran_low_t)x15;
+  output[11] = (tran_low_t)x7;
+  output[12] = (tran_low_t)x5;
+  output[13] = (tran_low_t)-x13;
+  output[14] = (tran_low_t)x9;
+  output[15] = (tran_low_t)-x1;
+}
+
+static const transform_2d FHT_4[] = {
+  { fdct4,  fdct4  },  // DCT_DCT  = 0
+  { fadst4, fdct4  },  // ADST_DCT = 1
+  { fdct4,  fadst4 },  // DCT_ADST = 2
+  { fadst4, fadst4 }   // ADST_ADST = 3
+};
+
+static const transform_2d FHT_8[] = {
+  { fdct8,  fdct8  },  // DCT_DCT  = 0
+  { fadst8, fdct8  },  // ADST_DCT = 1
+  { fdct8,  fadst8 },  // DCT_ADST = 2
+  { fadst8, fadst8 }   // ADST_ADST = 3
+};
+
+static const transform_2d FHT_16[] = {
+  { fdct16,  fdct16  },  // DCT_DCT  = 0
+  { fadst16, fdct16  },  // ADST_DCT = 1
+  { fdct16,  fadst16 },  // DCT_ADST = 2
+  { fadst16, fadst16 }   // ADST_ADST = 3
+};
+
 void vp9_fdct4x4_1_c(const int16_t *input, tran_low_t *output, int stride) {
   int r, c;
   tran_low_t sum = 0;
@@ -153,46 +613,6 @@ void vp9_fdct4x4_c(const int16_t *input, tran_low_t *output, int stride) {
   }
 }
 
-static void fadst4(const tran_low_t *input, tran_low_t *output) {
-  tran_high_t x0, x1, x2, x3;
-  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;
-
-  x0 = input[0];
-  x1 = input[1];
-  x2 = input[2];
-  x3 = input[3];
-
-  if (!(x0 | x1 | x2 | x3)) {
-    output[0] = output[1] = output[2] = output[3] = 0;
-    return;
-  }
-
-  s0 = sinpi_1_9 * x0;
-  s1 = sinpi_4_9 * x0;
-  s2 = sinpi_2_9 * x1;
-  s3 = sinpi_1_9 * x1;
-  s4 = sinpi_3_9 * x2;
-  s5 = sinpi_4_9 * x3;
-  s6 = sinpi_2_9 * x3;
-  s7 = x0 + x1 - x3;
-
-  x0 = s0 + s2 + s5;
-  x1 = sinpi_3_9 * s7;
-  x2 = s1 - s3 + s6;
-  x3 = s4;
-
-  s0 = x0 + x3;
-  s1 = x1;
-  s2 = x2 - x3;
-  s3 = x2 - x0 + x3;
-
-  // 1-D transform scaling factor is sqrt(2).
-  output[0] = (tran_low_t)fdct_round_shift(s0);
-  output[1] = (tran_low_t)fdct_round_shift(s1);
-  output[2] = (tran_low_t)fdct_round_shift(s2);
-  output[3] = (tran_low_t)fdct_round_shift(s3);
-}
-
 void vp9_fht4x4_c(const int16_t *input, tran_low_t *output,
                   int stride, int tx_type) {
   if (tx_type == DCT_DCT) {
@@ -225,58 +645,6 @@ void vp9_fht4x4_c(const int16_t *input, tran_low_t *output,
   }
 }
 
-static void fdct8(const tran_low_t *input, tran_low_t *output) {
-  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;  // canbe16
-  tran_high_t t0, t1, t2, t3;                  // needs32
-  tran_high_t x0, x1, x2, x3;                  // canbe16
-
-  // stage 1
-  s0 = input[0] + input[7];
-  s1 = input[1] + input[6];
-  s2 = input[2] + input[5];
-  s3 = input[3] + input[4];
-  s4 = input[3] - input[4];
-  s5 = input[2] - input[5];
-  s6 = input[1] - input[6];
-  s7 = input[0] - input[7];
-
-  // fdct4(step, step);
-  x0 = s0 + s3;
-  x1 = s1 + s2;
-  x2 = s1 - s2;
-  x3 = s0 - s3;
-  t0 = (x0 + x1) * cospi_16_64;
-  t1 = (x0 - x1) * cospi_16_64;
-  t2 =  x2 * cospi_24_64 + x3 *  cospi_8_64;
-  t3 = -x2 * cospi_8_64  + x3 * cospi_24_64;
-  output[0] = (tran_low_t)fdct_round_shift(t0);
-  output[2] = (tran_low_t)fdct_round_shift(t2);
-  output[4] = (tran_low_t)fdct_round_shift(t1);
-  output[6] = (tran_low_t)fdct_round_shift(t3);
-
-  // Stage 2
-  t0 = (s6 - s5) * cospi_16_64;
-  t1 = (s6 + s5) * cospi_16_64;
-  t2 = (tran_low_t)fdct_round_shift(t0);
-  t3 = (tran_low_t)fdct_round_shift(t1);
-
-  // Stage 3
-  x0 = s4 + t2;
-  x1 = s4 - t2;
-  x2 = s7 - t3;
-  x3 = s7 + t3;
-
-  // Stage 4
-  t0 = x0 * cospi_28_64 + x3 *   cospi_4_64;
-  t1 = x1 * cospi_12_64 + x2 *  cospi_20_64;
-  t2 = x2 * cospi_12_64 + x1 * -cospi_20_64;
-  t3 = x3 * cospi_28_64 + x0 *  -cospi_4_64;
-  output[1] = (tran_low_t)fdct_round_shift(t0);
-  output[3] = (tran_low_t)fdct_round_shift(t2);
-  output[5] = (tran_low_t)fdct_round_shift(t1);
-  output[7] = (tran_low_t)fdct_round_shift(t3);
-}
-
 void vp9_fdct8x8_1_c(const int16_t *input, tran_low_t *output, int stride) {
   int r, c;
   tran_low_t sum = 0;
@@ -662,77 +1030,6 @@ void vp9_fdct16x16_c(const int16_t *input, tran_low_t *output, int stride) {
   }
 }
 
-static void fadst8(const tran_low_t *input, tran_low_t *output) {
-  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;
-
-  tran_high_t x0 = input[7];
-  tran_high_t x1 = input[0];
-  tran_high_t x2 = input[5];
-  tran_high_t x3 = input[2];
-  tran_high_t x4 = input[3];
-  tran_high_t x5 = input[4];
-  tran_high_t x6 = input[1];
-  tran_high_t x7 = input[6];
-
-  // stage 1
-  s0 = cospi_2_64  * x0 + cospi_30_64 * x1;
-  s1 = cospi_30_64 * x0 - cospi_2_64  * x1;
-  s2 = cospi_10_64 * x2 + cospi_22_64 * x3;
-  s3 = cospi_22_64 * x2 - cospi_10_64 * x3;
-  s4 = cospi_18_64 * x4 + cospi_14_64 * x5;
-  s5 = cospi_14_64 * x4 - cospi_18_64 * x5;
-  s6 = cospi_26_64 * x6 + cospi_6_64  * x7;
-  s7 = cospi_6_64  * x6 - cospi_26_64 * x7;
-
-  x0 = fdct_round_shift(s0 + s4);
-  x1 = fdct_round_shift(s1 + s5);
-  x2 = fdct_round_shift(s2 + s6);
-  x3 = fdct_round_shift(s3 + s7);
-  x4 = fdct_round_shift(s0 - s4);
-  x5 = fdct_round_shift(s1 - s5);
-  x6 = fdct_round_shift(s2 - s6);
-  x7 = fdct_round_shift(s3 - s7);
-
-  // stage 2
-  s0 = x0;
-  s1 = x1;
-  s2 = x2;
-  s3 = x3;
-  s4 = cospi_8_64  * x4 + cospi_24_64 * x5;
-  s5 = cospi_24_64 * x4 - cospi_8_64  * x5;
-  s6 = - cospi_24_64 * x6 + cospi_8_64  * x7;
-  s7 =   cospi_8_64  * x6 + cospi_24_64 * x7;
-
-  x0 = s0 + s2;
-  x1 = s1 + s3;
-  x2 = s0 - s2;
-  x3 = s1 - s3;
-  x4 = fdct_round_shift(s4 + s6);
-  x5 = fdct_round_shift(s5 + s7);
-  x6 = fdct_round_shift(s4 - s6);
-  x7 = fdct_round_shift(s5 - s7);
-
-  // stage 3
-  s2 = cospi_16_64 * (x2 + x3);
-  s3 = cospi_16_64 * (x2 - x3);
-  s6 = cospi_16_64 * (x6 + x7);
-  s7 = cospi_16_64 * (x6 - x7);
-
-  x2 = fdct_round_shift(s2);
-  x3 = fdct_round_shift(s3);
-  x6 = fdct_round_shift(s6);
-  x7 = fdct_round_shift(s7);
-
-  output[0] = (tran_low_t)x0;
-  output[1] = (tran_low_t)-x4;
-  output[2] = (tran_low_t)x6;
-  output[3] = (tran_low_t)-x2;
-  output[4] = (tran_low_t)x3;
-  output[5] = (tran_low_t)-x7;
-  output[6] = (tran_low_t)x5;
-  output[7] = (tran_low_t)-x1;
-}
-
 void vp9_fht8x8_c(const int16_t *input, tran_low_t *output,
                   int stride, int tx_type) {
   if (tx_type == DCT_DCT) {
@@ -819,311 +1116,6 @@ void vp9_fwht4x4_c(const int16_t *input, tran_low_t *output, int stride) {
   }
 }
 
-// Rewrote to use same algorithm as others.
-static void fdct16(const tran_low_t in[16], tran_low_t out[16]) {
-  tran_high_t step1[8];      // canbe16
-  tran_high_t step2[8];      // canbe16
-  tran_high_t step3[8];      // canbe16
-  tran_high_t input[8];      // canbe16
-  tran_high_t temp1, temp2;  // needs32
-
-  // step 1
-  input[0] = in[0] + in[15];
-  input[1] = in[1] + in[14];
-  input[2] = in[2] + in[13];
-  input[3] = in[3] + in[12];
-  input[4] = in[4] + in[11];
-  input[5] = in[5] + in[10];
-  input[6] = in[6] + in[ 9];
-  input[7] = in[7] + in[ 8];
-
-  step1[0] = in[7] - in[ 8];
-  step1[1] = in[6] - in[ 9];
-  step1[2] = in[5] - in[10];
-  step1[3] = in[4] - in[11];
-  step1[4] = in[3] - in[12];
-  step1[5] = in[2] - in[13];
-  step1[6] = in[1] - in[14];
-  step1[7] = in[0] - in[15];
-
-  // fdct8(step, step);
-  {
-    tran_high_t s0, s1, s2, s3, s4, s5, s6, s7;  // canbe16
-    tran_high_t t0, t1, t2, t3;                  // needs32
-    tran_high_t x0, x1, x2, x3;                  // canbe16
-
-    // stage 1
-    s0 = input[0] + input[7];
-    s1 = input[1] + input[6];
-    s2 = input[2] + input[5];
-    s3 = input[3] + input[4];
-    s4 = input[3] - input[4];
-    s5 = input[2] - input[5];
-    s6 = input[1] - input[6];
-    s7 = input[0] - input[7];
-
-    // fdct4(step, step);
-    x0 = s0 + s3;
-    x1 = s1 + s2;
-    x2 = s1 - s2;
-    x3 = s0 - s3;
-    t0 = (x0 + x1) * cospi_16_64;
-    t1 = (x0 - x1) * cospi_16_64;
-    t2 = x3 * cospi_8_64  + x2 * cospi_24_64;
-    t3 = x3 * cospi_24_64 - x2 * cospi_8_64;
-    out[0] = (tran_low_t)fdct_round_shift(t0);
-    out[4] = (tran_low_t)fdct_round_shift(t2);
-    out[8] = (tran_low_t)fdct_round_shift(t1);
-    out[12] = (tran_low_t)fdct_round_shift(t3);
-
-    // Stage 2
-    t0 = (s6 - s5) * cospi_16_64;
-    t1 = (s6 + s5) * cospi_16_64;
-    t2 = fdct_round_shift(t0);
-    t3 = fdct_round_shift(t1);
-
-    // Stage 3
-    x0 = s4 + t2;
-    x1 = s4 - t2;
-    x2 = s7 - t3;
-    x3 = s7 + t3;
-
-    // Stage 4
-    t0 = x0 * cospi_28_64 + x3 *   cospi_4_64;
-    t1 = x1 * cospi_12_64 + x2 *  cospi_20_64;
-    t2 = x2 * cospi_12_64 + x1 * -cospi_20_64;
-    t3 = x3 * cospi_28_64 + x0 *  -cospi_4_64;
-    out[2] = (tran_low_t)fdct_round_shift(t0);
-    out[6] = (tran_low_t)fdct_round_shift(t2);
-    out[10] = (tran_low_t)fdct_round_shift(t1);
-    out[14] = (tran_low_t)fdct_round_shift(t3);
-  }
-
-  // step 2
-  temp1 = (step1[5] - step1[2]) * cospi_16_64;
-  temp2 = (step1[4] - step1[3]) * cospi_16_64;
-  step2[2] = fdct_round_shift(temp1);
-  step2[3] = fdct_round_shift(temp2);
-  temp1 = (step1[4] + step1[3]) * cospi_16_64;
-  temp2 = (step1[5] + step1[2]) * cospi_16_64;
-  step2[4] = fdct_round_shift(temp1);
-  step2[5] = fdct_round_shift(temp2);
-
-  // step 3
-  step3[0] = step1[0] + step2[3];
-  step3[1] = step1[1] + step2[2];
-  step3[2] = step1[1] - step2[2];
-  step3[3] = step1[0] - step2[3];
-  step3[4] = step1[7] - step2[4];
-  step3[5] = step1[6] - step2[5];
-  step3[6] = step1[6] + step2[5];
-  step3[7] = step1[7] + step2[4];
-
-  // step 4
-  temp1 = step3[1] *  -cospi_8_64 + step3[6] * cospi_24_64;
-  temp2 = step3[2] * cospi_24_64 + step3[5] *  cospi_8_64;
-  step2[1] = fdct_round_shift(temp1);
-  step2[2] = fdct_round_shift(temp2);
-  temp1 = step3[2] * cospi_8_64 - step3[5] * cospi_24_64;
-  temp2 = step3[1] * cospi_24_64 + step3[6] *  cospi_8_64;
-  step2[5] = fdct_round_shift(temp1);
-  step2[6] = fdct_round_shift(temp2);
-
-  // step 5
-  step1[0] = step3[0] + step2[1];
-  step1[1] = step3[0] - step2[1];
-  step1[2] = step3[3] + step2[2];
-  step1[3] = step3[3] - step2[2];
-  step1[4] = step3[4] - step2[5];
-  step1[5] = step3[4] + step2[5];
-  step1[6] = step3[7] - step2[6];
-  step1[7] = step3[7] + step2[6];
-
-  // step 6
-  temp1 = step1[0] * cospi_30_64 + step1[7] *  cospi_2_64;
-  temp2 = step1[1] * cospi_14_64 + step1[6] * cospi_18_64;
-  out[1] = (tran_low_t)fdct_round_shift(temp1);
-  out[9] = (tran_low_t)fdct_round_shift(temp2);
-
-  temp1 = step1[2] * cospi_22_64 + step1[5] * cospi_10_64;
-  temp2 = step1[3] *  cospi_6_64 + step1[4] * cospi_26_64;
-  out[5] = (tran_low_t)fdct_round_shift(temp1);
-  out[13] = (tran_low_t)fdct_round_shift(temp2);
-
-  temp1 = step1[3] * -cospi_26_64 + step1[4] *  cospi_6_64;
-  temp2 = step1[2] * -cospi_10_64 + step1[5] * cospi_22_64;
-  out[3] = (tran_low_t)fdct_round_shift(temp1);
-  out[11] = (tran_low_t)fdct_round_shift(temp2);
-
-  temp1 = step1[1] * -cospi_18_64 + step1[6] * cospi_14_64;
-  temp2 = step1[0] *  -cospi_2_64 + step1[7] * cospi_30_64;
-  out[7] = (tran_low_t)fdct_round_shift(temp1);
-  out[15] = (tran_low_t)fdct_round_shift(temp2);
-}
-
-static void fadst16(const tran_low_t *input, tran_low_t *output) {
-  tran_high_t s0, s1, s2, s3, s4, s5, s6, s7, s8;
-  tran_high_t s9, s10, s11, s12, s13, s14, s15;
-
-  tran_high_t x0 = input[15];
-  tran_high_t x1 = input[0];
-  tran_high_t x2 = input[13];
-  tran_high_t x3 = input[2];
-  tran_high_t x4 = input[11];
-  tran_high_t x5 = input[4];
-  tran_high_t x6 = input[9];
-  tran_high_t x7 = input[6];
-  tran_high_t x8 = input[7];
-  tran_high_t x9 = input[8];
-  tran_high_t x10 = input[5];
-  tran_high_t x11 = input[10];
-  tran_high_t x12 = input[3];
-  tran_high_t x13 = input[12];
-  tran_high_t x14 = input[1];
-  tran_high_t x15 = input[14];
-
-  // stage 1
-  s0 = x0 * cospi_1_64  + x1 * cospi_31_64;
-  s1 = x0 * cospi_31_64 - x1 * cospi_1_64;
-  s2 = x2 * cospi_5_64  + x3 * cospi_27_64;
-  s3 = x2 * cospi_27_64 - x3 * cospi_5_64;
-  s4 = x4 * cospi_9_64  + x5 * cospi_23_64;
-  s5 = x4 * cospi_23_64 - x5 * cospi_9_64;
-  s6 = x6 * cospi_13_64 + x7 * cospi_19_64;
-  s7 = x6 * cospi_19_64 - x7 * cospi_13_64;
-  s8 = x8 * cospi_17_64 + x9 * cospi_15_64;
-  s9 = x8 * cospi_15_64 - x9 * cospi_17_64;
-  s10 = x10 * cospi_21_64 + x11 * cospi_11_64;
-  s11 = x10 * cospi_11_64 - x11 * cospi_21_64;
-  s12 = x12 * cospi_25_64 + x13 * cospi_7_64;
-  s13 = x12 * cospi_7_64  - x13 * cospi_25_64;
-  s14 = x14 * cospi_29_64 + x15 * cospi_3_64;
-  s15 = x14 * cospi_3_64  - x15 * cospi_29_64;
-
-  x0 = fdct_round_shift(s0 + s8);
-  x1 = fdct_round_shift(s1 + s9);
-  x2 = fdct_round_shift(s2 + s10);
-  x3 = fdct_round_shift(s3 + s11);
-  x4 = fdct_round_shift(s4 + s12);
-  x5 = fdct_round_shift(s5 + s13);
-  x6 = fdct_round_shift(s6 + s14);
-  x7 = fdct_round_shift(s7 + s15);
-  x8  = fdct_round_shift(s0 - s8);
-  x9  = fdct_round_shift(s1 - s9);
-  x10 = fdct_round_shift(s2 - s10);
-  x11 = fdct_round_shift(s3 - s11);
-  x12 = fdct_round_shift(s4 - s12);
-  x13 = fdct_round_shift(s5 - s13);
-  x14 = fdct_round_shift(s6 - s14);
-  x15 = fdct_round_shift(s7 - s15);
-
-  // stage 2
-  s0 = x0;
-  s1 = x1;
-  s2 = x2;
-  s3 = x3;
-  s4 = x4;
-  s5 = x5;
-  s6 = x6;
-  s7 = x7;
-  s8 =    x8 * cospi_4_64   + x9 * cospi_28_64;
-  s9 =    x8 * cospi_28_64  - x9 * cospi_4_64;
-  s10 =   x10 * cospi_20_64 + x11 * cospi_12_64;
-  s11 =   x10 * cospi_12_64 - x11 * cospi_20_64;
-  s12 = - x12 * cospi_28_64 + x13 * cospi_4_64;
-  s13 =   x12 * cospi_4_64  + x13 * cospi_28_64;
-  s14 = - x14 * cospi_12_64 + x15 * cospi_20_64;
-  s15 =   x14 * cospi_20_64 + x15 * cospi_12_64;
-
-  x0 = s0 + s4;
-  x1 = s1 + s5;
-  x2 = s2 + s6;
-  x3 = s3 + s7;
-  x4 = s0 - s4;
-  x5 = s1 - s5;
-  x6 = s2 - s6;
-  x7 = s3 - s7;
-  x8 = fdct_round_shift(s8 + s12);
-  x9 = fdct_round_shift(s9 + s13);
-  x10 = fdct_round_shift(s10 + s14);
-  x11 = fdct_round_shift(s11 + s15);
-  x12 = fdct_round_shift(s8 - s12);
-  x13 = fdct_round_shift(s9 - s13);
-  x14 = fdct_round_shift(s10 - s14);
-  x15 = fdct_round_shift(s11 - s15);
-
-  // stage 3
-  s0 = x0;
-  s1 = x1;
-  s2 = x2;
-  s3 = x3;
-  s4 = x4 * cospi_8_64  + x5 * cospi_24_64;
-  s5 = x4 * cospi_24_64 - x5 * cospi_8_64;
-  s6 = - x6 * cospi_24_64 + x7 * cospi_8_64;
-  s7 =   x6 * cospi_8_64  + x7 * cospi_24_64;
-  s8 = x8;
-  s9 = x9;
-  s10 = x10;
-  s11 = x11;
-  s12 = x12 * cospi_8_64  + x13 * cospi_24_64;
-  s13 = x12 * cospi_24_64 - x13 * cospi_8_64;
-  s14 = - x14 * cospi_24_64 + x15 * cospi_8_64;
-  s15 =   x14 * cospi_8_64  + x15 * cospi_24_64;
-
-  x0 = s0 + s2;
-  x1 = s1 + s3;
-  x2 = s0 - s2;
-  x3 = s1 - s3;
-  x4 = fdct_round_shift(s4 + s6);
-  x5 = fdct_round_shift(s5 + s7);
-  x6 = fdct_round_shift(s4 - s6);
-  x7 = fdct_round_shift(s5 - s7);
-  x8 = s8 + s10;
-  x9 = s9 + s11;
-  x10 = s8 - s10;
-  x11 = s9 - s11;
-  x12 = fdct_round_shift(s12 + s14);
-  x13 = fdct_round_shift(s13 + s15);
-  x14 = fdct_round_shift(s12 - s14);
-  x15 = fdct_round_shift(s13 - s15);
-
-  // stage 4
-  s2 = (- cospi_16_64) * (x2 + x3);
-  s3 = cospi_16_64 * (x2 - x3);
-  s6 = cospi_16_64 * (x6 + x7);
-  s7 = cospi_16_64 * (- x6 + x7);
-  s10 = cospi_16_64 * (x10 + x11);
-  s11 = cospi_16_64 * (- x10 + x11);
-  s14 = (- cospi_16_64) * (x14 + x15);
-  s15 = cospi_16_64 * (x14 - x15);
-
-  x2 = fdct_round_shift(s2);
-  x3 = fdct_round_shift(s3);
-  x6 = fdct_round_shift(s6);
-  x7 = fdct_round_shift(s7);
-  x10 = fdct_round_shift(s10);
-  x11 = fdct_round_shift(s11);
-  x14 = fdct_round_shift(s14);
-  x15 = fdct_round_shift(s15);
-
-  output[0] = (tran_low_t)x0;
-  output[1] = (tran_low_t)-x8;
-  output[2] = (tran_low_t)x12;
-  output[3] = (tran_low_t)-x4;
-  output[4] = (tran_low_t)x6;
-  output[5] = (tran_low_t)x14;
-  output[6] = (tran_low_t)x10;
-  output[7] = (tran_low_t)x2;
-  output[8] = (tran_low_t)x3;
-  output[9] = (tran_low_t)x11;
-  output[10] = (tran_low_t)x15;
-  output[11] = (tran_low_t)x7;
-  output[12] = (tran_low_t)x5;
-  output[13] = (tran_low_t)-x13;
-  output[14] = (tran_low_t)x9;
-  output[15] = (tran_low_t)-x1;
-}
-
 void vp9_fht16x16_c(const int16_t *input, tran_low_t *output,
                     int stride, int tx_type) {
   if (tx_type == DCT_DCT) {