libvpx: Pull from upstream

source/libvpx/vp9/common/arm/neon/vp9_idct4x4_add_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 vp9_idct4x4_16_add_neon(
+        int16_t *input,
+        uint8_t *dest,
+        int dest_stride) {
+    uint8x8_t d26u8, d27u8;
+    uint32x2_t d26u32, d27u32;
+    uint16x8_t q8u16, q9u16;
+    int16x4_t d16s16, d17s16, d18s16, d19s16, d20s16, d21s16;
+    int16x4_t d22s16, d23s16, d24s16, d26s16, d27s16, d28s16, d29s16;
+    int16x8_t q8s16, q9s16, q13s16, q14s16;
+    int32x4_t q1s32, q13s32, q14s32, q15s32;
+    int16x4x2_t d0x2s16, d1x2s16;
+    int32x4x2_t q0x2s32;
+    uint8_t *d;
+    int16_t cospi_8_64 = 15137;
+    int16_t cospi_16_64 = 11585;
+    int16_t cospi_24_64 = 6270;
+
+    d26u32 = d27u32 = vdup_n_u32(0);
+
+    q8s16 = vld1q_s16(input);
+    q9s16 = vld1q_s16(input + 8);
+
+    d16s16 = vget_low_s16(q8s16);
+    d17s16 = vget_high_s16(q8s16);
+    d18s16 = vget_low_s16(q9s16);
+    d19s16 = vget_high_s16(q9s16);
+
+    d0x2s16 = vtrn_s16(d16s16, d17s16);
+    d1x2s16 = vtrn_s16(d18s16, d19s16);
+    q8s16 = vcombine_s16(d0x2s16.val[0], d0x2s16.val[1]);
+    q9s16 = vcombine_s16(d1x2s16.val[0], d1x2s16.val[1]);
+
+    d20s16 = vdup_n_s16(cospi_8_64);
+    d21s16 = vdup_n_s16(cospi_16_64);
+
+    q0x2s32 = vtrnq_s32(vreinterpretq_s32_s16(q8s16),
+                        vreinterpretq_s32_s16(q9s16));
+    d16s16 = vget_low_s16(vreinterpretq_s16_s32(q0x2s32.val[0]));
+    d17s16 = vget_high_s16(vreinterpretq_s16_s32(q0x2s32.val[0]));
+    d18s16 = vget_low_s16(vreinterpretq_s16_s32(q0x2s32.val[1]));
+    d19s16 = vget_high_s16(vreinterpretq_s16_s32(q0x2s32.val[1]));
+
+    d22s16 = vdup_n_s16(cospi_24_64);
+
+    // stage 1
+    d23s16 = vadd_s16(d16s16, d18s16);
+    d24s16 = vsub_s16(d16s16, d18s16);
+
+    q15s32 = vmull_s16(d17s16, d22s16);
+    q1s32  = vmull_s16(d17s16, d20s16);
+    q13s32 = vmull_s16(d23s16, d21s16);
+    q14s32 = vmull_s16(d24s16, d21s16);
+
+    q15s32 = vmlsl_s16(q15s32, d19s16, d20s16);
+    q1s32  = vmlal_s16(q1s32,  d19s16, d22s16);
+
+    d26s16 = vqrshrn_n_s32(q13s32, 14);
+    d27s16 = vqrshrn_n_s32(q14s32, 14);
+    d29s16 = vqrshrn_n_s32(q15s32, 14);
+    d28s16 = vqrshrn_n_s32(q1s32,  14);
+    q13s16 = vcombine_s16(d26s16, d27s16);
+    q14s16 = vcombine_s16(d28s16, d29s16);
+
+    // stage 2
+    q8s16 = vaddq_s16(q13s16, q14s16);
+    q9s16 = vsubq_s16(q13s16, q14s16);
+
+    d16s16 = vget_low_s16(q8s16);
+    d17s16 = vget_high_s16(q8s16);
+    d18s16 = vget_high_s16(q9s16);  // vswp d18 d19
+    d19s16 = vget_low_s16(q9s16);
+
+    d0x2s16 = vtrn_s16(d16s16, d17s16);
+    d1x2s16 = vtrn_s16(d18s16, d19s16);
+    q8s16 = vcombine_s16(d0x2s16.val[0], d0x2s16.val[1]);
+    q9s16 = vcombine_s16(d1x2s16.val[0], d1x2s16.val[1]);
+
+    q0x2s32 = vtrnq_s32(vreinterpretq_s32_s16(q8s16),
+                        vreinterpretq_s32_s16(q9s16));
+    d16s16 = vget_low_s16(vreinterpretq_s16_s32(q0x2s32.val[0]));
+    d17s16 = vget_high_s16(vreinterpretq_s16_s32(q0x2s32.val[0]));
+    d18s16 = vget_low_s16(vreinterpretq_s16_s32(q0x2s32.val[1]));
+    d19s16 = vget_high_s16(vreinterpretq_s16_s32(q0x2s32.val[1]));
+
+    // do the transform on columns
+    // stage 1
+    d23s16 = vadd_s16(d16s16, d18s16);
+    d24s16 = vsub_s16(d16s16, d18s16);
+
+    q15s32 = vmull_s16(d17s16, d22s16);
+    q1s32  = vmull_s16(d17s16, d20s16);
+    q13s32 = vmull_s16(d23s16, d21s16);
+    q14s32 = vmull_s16(d24s16, d21s16);
+
+    q15s32 = vmlsl_s16(q15s32, d19s16, d20s16);
+    q1s32  = vmlal_s16(q1s32,  d19s16, d22s16);
+
+    d26s16 = vqrshrn_n_s32(q13s32, 14);
+    d27s16 = vqrshrn_n_s32(q14s32, 14);
+    d29s16 = vqrshrn_n_s32(q15s32, 14);
+    d28s16 = vqrshrn_n_s32(q1s32,  14);
+    q13s16 = vcombine_s16(d26s16, d27s16);
+    q14s16 = vcombine_s16(d28s16, d29s16);
+
+    // stage 2
+    q8s16 = vaddq_s16(q13s16, q14s16);
+    q9s16 = vsubq_s16(q13s16, q14s16);
+
+    q8s16 = vrshrq_n_s16(q8s16, 4);
+    q9s16 = vrshrq_n_s16(q9s16, 4);
+
+    d = dest;
+    d26u32 = vld1_lane_u32((const uint32_t *)d, d26u32, 0);
+    d += dest_stride;
+    d26u32 = vld1_lane_u32((const uint32_t *)d, d26u32, 1);
+    d += dest_stride;
+    d27u32 = vld1_lane_u32((const uint32_t *)d, d27u32, 1);
+    d += dest_stride;
+    d27u32 = vld1_lane_u32((const uint32_t *)d, d27u32, 0);
+
+    q8u16 = vaddw_u8(vreinterpretq_u16_s16(q8s16),
+                     vreinterpret_u8_u32(d26u32));
+    q9u16 = vaddw_u8(vreinterpretq_u16_s16(q9s16),
+                     vreinterpret_u8_u32(d27u32));
+
+    d26u8 = vqmovun_s16(vreinterpretq_s16_u16(q8u16));
+    d27u8 = vqmovun_s16(vreinterpretq_s16_u16(q9u16));
+
+    d = dest;
+    vst1_lane_u32((uint32_t *)d, vreinterpret_u32_u8(d26u8), 0);
+    d += dest_stride;
+    vst1_lane_u32((uint32_t *)d, vreinterpret_u32_u8(d26u8), 1);
+    d += dest_stride;
+    vst1_lane_u32((uint32_t *)d, vreinterpret_u32_u8(d27u8), 1);
+    d += dest_stride;
+    vst1_lane_u32((uint32_t *)d, vreinterpret_u32_u8(d27u8), 0);
+    return;
+}