libvpx: Pull from upstream

source/libvpx/vp8/common/arm/neon/idct_dequant_0_2x_neon.c

-/*
- *  Copyright (c) 2014 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 <arm_neon.h>
-
-void idct_dequant_0_2x_neon(
-        int16_t *q,
-        int16_t dq,
-        unsigned char *dst,
-        int stride) {
-    unsigned char *dst0;
-    int i, a0, a1;
-    int16x8x2_t q2Add;
-    int32x2_t d2s32, d4s32;
-    uint8x8_t d2u8, d4u8;
-    uint16x8_t q1u16, q2u16;
-
-    a0 = ((q[0] * dq) + 4) >> 3;
-    a1 = ((q[16] * dq) + 4) >> 3;
-    q[0] = q[16] = 0;
-    q2Add.val[0] = vdupq_n_s16((int16_t)a0);
-    q2Add.val[1] = vdupq_n_s16((int16_t)a1);
-
-    for (i = 0; i < 2; i++, dst += 4) {
-        dst0 = dst;
-        d2s32 = vld1_lane_s32((const int32_t *)dst0, d2s32, 0);
-        dst0 += stride;
-        d2s32 = vld1_lane_s32((const int32_t *)dst0, d2s32, 1);
-        dst0 += stride;
-        d4s32 = vld1_lane_s32((const int32_t *)dst0, d4s32, 0);
-        dst0 += stride;
-        d4s32 = vld1_lane_s32((const int32_t *)dst0, d4s32, 1);
-
-        q1u16 = vaddw_u8(vreinterpretq_u16_s16(q2Add.val[i]),
-                         vreinterpret_u8_s32(d2s32));
-        q2u16 = vaddw_u8(vreinterpretq_u16_s16(q2Add.val[i]),
-                         vreinterpret_u8_s32(d4s32));
-
-        d2u8 = vqmovun_s16(vreinterpretq_s16_u16(q1u16));
-        d4u8 = vqmovun_s16(vreinterpretq_s16_u16(q2u16));
-
-        d2s32 = vreinterpret_s32_u8(d2u8);
-        d4s32 = vreinterpret_s32_u8(d4u8);
-
-        dst0 = dst;
-        vst1_lane_s32((int32_t *)dst0, d2s32, 0);
-        dst0 += stride;
-        vst1_lane_s32((int32_t *)dst0, d2s32, 1);
-        dst0 += stride;
-        vst1_lane_s32((int32_t *)dst0, d4s32, 0);
-        dst0 += stride;
-        vst1_lane_s32((int32_t *)dst0, d4s32, 1);
-    }
-    return;
-}