Remove unreachable tx: iwht4x4

Change-Id: I709cb947ad7e4eaf10fdf3e013054a20985cfcb8
diff --git a/aom_dsp/aom_dsp_rtcd_defs.pl b/aom_dsp/aom_dsp_rtcd_defs.pl
index 0ad9e0d..9b1a99c 100755
--- a/aom_dsp/aom_dsp_rtcd_defs.pl
+++ b/aom_dsp/aom_dsp_rtcd_defs.pl
@@ -441,11 +441,6 @@
 #
 # Inverse transform
 if (aom_config("CONFIG_AV1") eq "yes") {
-  add_proto qw/void aom_iwht4x4_1_add/, "const tran_low_t *input, uint8_t *dest, int dest_stride";
-
-  add_proto qw/void aom_iwht4x4_16_add/, "const tran_low_t *input, uint8_t *dest, int dest_stride";
-  specialize qw/aom_iwht4x4_16_add sse2/;
-
   add_proto qw/void aom_highbd_iwht4x4_1_add/, "const tran_low_t *input, uint8_t *dest, int dest_stride, int bd";
 
   add_proto qw/void aom_highbd_iwht4x4_16_add/, "const tran_low_t *input, uint8_t *dest, int dest_stride, int bd";
diff --git a/aom_dsp/inv_txfm.c b/aom_dsp/inv_txfm.c
index 245763f..b88c9d8 100644
--- a/aom_dsp/inv_txfm.c
+++ b/aom_dsp/inv_txfm.c
@@ -15,84 +15,6 @@
 #include "./aom_dsp_rtcd.h"
 #include "aom_dsp/inv_txfm.h"
 
-void aom_iwht4x4_16_add_c(const tran_low_t *input, uint8_t *dest, int stride) {
-  /* 4-point reversible, orthonormal inverse Walsh-Hadamard in 3.5 adds,
-     0.5 shifts per pixel. */
-  int i;
-  tran_low_t output[16];
-  tran_high_t a1, b1, c1, d1, e1;
-  const tran_low_t *ip = input;
-  tran_low_t *op = output;
-
-  for (i = 0; i < 4; i++) {
-    a1 = ip[0] >> UNIT_QUANT_SHIFT;
-    c1 = ip[1] >> UNIT_QUANT_SHIFT;
-    d1 = ip[2] >> UNIT_QUANT_SHIFT;
-    b1 = ip[3] >> UNIT_QUANT_SHIFT;
-    a1 += c1;
-    d1 -= b1;
-    e1 = (a1 - d1) >> 1;
-    b1 = e1 - b1;
-    c1 = e1 - c1;
-    a1 -= b1;
-    d1 += c1;
-    op[0] = WRAPLOW(a1);
-    op[1] = WRAPLOW(b1);
-    op[2] = WRAPLOW(c1);
-    op[3] = WRAPLOW(d1);
-    ip += 4;
-    op += 4;
-  }
-
-  ip = output;
-  for (i = 0; i < 4; i++) {
-    a1 = ip[4 * 0];
-    c1 = ip[4 * 1];
-    d1 = ip[4 * 2];
-    b1 = ip[4 * 3];
-    a1 += c1;
-    d1 -= b1;
-    e1 = (a1 - d1) >> 1;
-    b1 = e1 - b1;
-    c1 = e1 - c1;
-    a1 -= b1;
-    d1 += c1;
-    dest[stride * 0] = clip_pixel_add(dest[stride * 0], WRAPLOW(a1));
-    dest[stride * 1] = clip_pixel_add(dest[stride * 1], WRAPLOW(b1));
-    dest[stride * 2] = clip_pixel_add(dest[stride * 2], WRAPLOW(c1));
-    dest[stride * 3] = clip_pixel_add(dest[stride * 3], WRAPLOW(d1));
-
-    ip++;
-    dest++;
-  }
-}
-
-void aom_iwht4x4_1_add_c(const tran_low_t *in, uint8_t *dest, int dest_stride) {
-  int i;
-  tran_high_t a1, e1;
-  tran_low_t tmp[4];
-  const tran_low_t *ip = in;
-  tran_low_t *op = tmp;
-
-  a1 = ip[0] >> UNIT_QUANT_SHIFT;
-  e1 = a1 >> 1;
-  a1 -= e1;
-  op[0] = WRAPLOW(a1);
-  op[1] = op[2] = op[3] = WRAPLOW(e1);
-
-  ip = tmp;
-  for (i = 0; i < 4; i++) {
-    e1 = ip[0] >> 1;
-    a1 = ip[0] - e1;
-    dest[dest_stride * 0] = clip_pixel_add(dest[dest_stride * 0], a1);
-    dest[dest_stride * 1] = clip_pixel_add(dest[dest_stride * 1], e1);
-    dest[dest_stride * 2] = clip_pixel_add(dest[dest_stride * 2], e1);
-    dest[dest_stride * 3] = clip_pixel_add(dest[dest_stride * 3], e1);
-    ip++;
-    dest++;
-  }
-}
-
 void aom_highbd_iwht4x4_16_add_c(const tran_low_t *input, uint8_t *dest8,
                                  int stride, int bd) {
   /* 4-point reversible, orthonormal inverse Walsh-Hadamard in 3.5 adds,
diff --git a/test/fdct4x4_test.cc b/test/fdct4x4_test.cc
index f03b1e1..30f8cda 100644
--- a/test/fdct4x4_test.cc
+++ b/test/fdct4x4_test.cc
@@ -94,17 +94,5 @@
     ::testing::Values(make_tuple(&av1_highbd_fwht4x4_c, &iwht4x4_10, DCT_DCT,
                                  AOM_BITS_10, 16),
                       make_tuple(&av1_highbd_fwht4x4_c, &iwht4x4_12, DCT_DCT,
-                                 AOM_BITS_12, 16),
-                      make_tuple(&av1_fwht4x4_c, &aom_iwht4x4_16_add_c, DCT_DCT,
-                                 AOM_BITS_8, 16)));
-
-#if HAVE_SSE2
-INSTANTIATE_TEST_CASE_P(
-    SSE2, Trans4x4WHT,
-    ::testing::Values(make_tuple(&av1_fwht4x4_c, &aom_iwht4x4_16_add_c, DCT_DCT,
-                                 AOM_BITS_8, 16),
-                      make_tuple(&av1_fwht4x4_c, &aom_iwht4x4_16_add_sse2,
-                                 DCT_DCT, AOM_BITS_8, 16)));
-#endif
-
+                                 AOM_BITS_12, 16)));
 }  // namespace