libvpx: Pull from upstream

source/libvpx/vp9/encoder/x86/vp9_dct_sse2.c

 /*
  *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
+#include <assert.h>
 #include <emmintrin.h>  // SSE2
 #include "vp9/common/vp9_idct.h"  // for cospi constants
 #include "vp9/encoder/vp9_dct.h"
 #include "vp9/encoder/x86/vp9_dct_sse2.h"
 #include "vpx_ports/mem.h"
 
 void vp9_fdct4x4_1_sse2(const int16_t *input, tran_low_t *output, int stride) {
   __m128i in0, in1;
   __m128i tmp;
   const __m128i zero = _mm_setzero_si128();
@@ skipping 582 matching lines @@
 
     // AC only loop
     index = 2;
     while (n_coeffs < 0) {
       __m128i coeff0, coeff1;
       {
         __m128i coeff0_sign, coeff1_sign;
         __m128i qcoeff0, qcoeff1;
         __m128i qtmp0, qtmp1;
 
+        assert(index < (int)(sizeof(in) / sizeof(in[0])) - 1);
         coeff0 = *in[index];
         coeff1 = *in[index + 1];
 
         // Poor man's sign extract
         coeff0_sign = _mm_srai_epi16(coeff0, 15);
         coeff1_sign = _mm_srai_epi16(coeff1, 15);
         qcoeff0 = _mm_xor_si128(coeff0, coeff0_sign);
         qcoeff1 = _mm_xor_si128(coeff1, coeff1_sign);
         qcoeff0 = _mm_sub_epi16(qcoeff0, coeff0_sign);
         qcoeff1 = _mm_sub_epi16(qcoeff1, coeff1_sign);
@@ skipping 1793 matching lines @@
 
 #define FDCT32x32_2D vp9_highbd_fdct32x32_sse2
 #define FDCT32x32_HIGH_PRECISION 1
 #include "vp9/encoder/x86/vp9_dct32x32_sse2.c" // NOLINT
 #undef  FDCT32x32_2D
 #undef  FDCT32x32_HIGH_PRECISION
 
 #undef  DCT_HIGH_BIT_DEPTH
 
 #endif  // CONFIG_VP9_HIGHBITDEPTH