diff options
Diffstat (limited to 'media/libvpx/libvpx/vp8/common/arm/neon/dequant_idct_neon.c')
| -rw-r--r-- | media/libvpx/libvpx/vp8/common/arm/neon/dequant_idct_neon.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/media/libvpx/libvpx/vp8/common/arm/neon/dequant_idct_neon.c b/media/libvpx/libvpx/vp8/common/arm/neon/dequant_idct_neon.c new file mode 100644 index 0000000000..5445f2965a --- /dev/null +++ b/media/libvpx/libvpx/vp8/common/arm/neon/dequant_idct_neon.c @@ -0,0 +1,141 @@ +/* + * 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> + +#include "./vp8_rtcd.h" + +static const int16_t cospi8sqrt2minus1 = 20091; +// 35468 exceeds INT16_MAX and gets converted to a negative number. Because of +// the way it is used in vqdmulh, where the result is doubled, it can be divided +// by 2 beforehand. This saves compensating for the negative value as well as +// shifting the result. +static const int16_t sinpi8sqrt2 = 35468 >> 1; + +void vp8_dequant_idct_add_neon(int16_t *input, int16_t *dq, unsigned char *dst, + int stride) { + unsigned char *dst0; + int32x2_t d14, d15; + int16x4_t d2, d3, d4, d5, d10, d11, d12, d13; + int16x8_t q1, q2, q3, q4, q5, q6; + int16x8_t qEmpty = vdupq_n_s16(0); + int32x2x2_t d2tmp0, d2tmp1; + int16x4x2_t d2tmp2, d2tmp3; + + d14 = d15 = vdup_n_s32(0); + + // load input + q3 = vld1q_s16(input); + vst1q_s16(input, qEmpty); + input += 8; + q4 = vld1q_s16(input); + vst1q_s16(input, qEmpty); + + // load dq + q5 = vld1q_s16(dq); + dq += 8; + q6 = vld1q_s16(dq); + + // load src from dst + dst0 = dst; + d14 = vld1_lane_s32((const int32_t *)dst0, d14, 0); + dst0 += stride; + d14 = vld1_lane_s32((const int32_t *)dst0, d14, 1); + dst0 += stride; + d15 = vld1_lane_s32((const int32_t *)dst0, d15, 0); + dst0 += stride; + d15 = vld1_lane_s32((const int32_t *)dst0, d15, 1); + + q1 = vreinterpretq_s16_u16( + vmulq_u16(vreinterpretq_u16_s16(q3), vreinterpretq_u16_s16(q5))); + q2 = vreinterpretq_s16_u16( + vmulq_u16(vreinterpretq_u16_s16(q4), vreinterpretq_u16_s16(q6))); + + d12 = vqadd_s16(vget_low_s16(q1), vget_low_s16(q2)); + d13 = vqsub_s16(vget_low_s16(q1), vget_low_s16(q2)); + + q2 = vcombine_s16(vget_high_s16(q1), vget_high_s16(q2)); + + q3 = vqdmulhq_n_s16(q2, sinpi8sqrt2); + q4 = vqdmulhq_n_s16(q2, cospi8sqrt2minus1); + + q4 = vshrq_n_s16(q4, 1); + + q4 = vqaddq_s16(q4, q2); + + d10 = vqsub_s16(vget_low_s16(q3), vget_high_s16(q4)); + d11 = vqadd_s16(vget_high_s16(q3), vget_low_s16(q4)); + + d2 = vqadd_s16(d12, d11); + d3 = vqadd_s16(d13, d10); + d4 = vqsub_s16(d13, d10); + d5 = vqsub_s16(d12, d11); + + d2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4)); + d2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5)); + d2tmp2 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[0]), + vreinterpret_s16_s32(d2tmp1.val[0])); + d2tmp3 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[1]), + vreinterpret_s16_s32(d2tmp1.val[1])); + + // loop 2 + q2 = vcombine_s16(d2tmp2.val[1], d2tmp3.val[1]); + + q3 = vqdmulhq_n_s16(q2, sinpi8sqrt2); + q4 = vqdmulhq_n_s16(q2, cospi8sqrt2minus1); + + d12 = vqadd_s16(d2tmp2.val[0], d2tmp3.val[0]); + d13 = vqsub_s16(d2tmp2.val[0], d2tmp3.val[0]); + + q4 = vshrq_n_s16(q4, 1); + + q4 = vqaddq_s16(q4, q2); + + d10 = vqsub_s16(vget_low_s16(q3), vget_high_s16(q4)); + d11 = vqadd_s16(vget_high_s16(q3), vget_low_s16(q4)); + + d2 = vqadd_s16(d12, d11); + d3 = vqadd_s16(d13, d10); + d4 = vqsub_s16(d13, d10); + d5 = vqsub_s16(d12, d11); + + d2 = vrshr_n_s16(d2, 3); + d3 = vrshr_n_s16(d3, 3); + d4 = vrshr_n_s16(d4, 3); + d5 = vrshr_n_s16(d5, 3); + + d2tmp0 = vtrn_s32(vreinterpret_s32_s16(d2), vreinterpret_s32_s16(d4)); + d2tmp1 = vtrn_s32(vreinterpret_s32_s16(d3), vreinterpret_s32_s16(d5)); + d2tmp2 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[0]), + vreinterpret_s16_s32(d2tmp1.val[0])); + d2tmp3 = vtrn_s16(vreinterpret_s16_s32(d2tmp0.val[1]), + vreinterpret_s16_s32(d2tmp1.val[1])); + + q1 = vcombine_s16(d2tmp2.val[0], d2tmp2.val[1]); + q2 = vcombine_s16(d2tmp3.val[0], d2tmp3.val[1]); + + q1 = vreinterpretq_s16_u16( + vaddw_u8(vreinterpretq_u16_s16(q1), vreinterpret_u8_s32(d14))); + q2 = vreinterpretq_s16_u16( + vaddw_u8(vreinterpretq_u16_s16(q2), vreinterpret_u8_s32(d15))); + + d14 = vreinterpret_s32_u8(vqmovun_s16(q1)); + d15 = vreinterpret_s32_u8(vqmovun_s16(q2)); + + dst0 = dst; + vst1_lane_s32((int32_t *)dst0, d14, 0); + dst0 += stride; + vst1_lane_s32((int32_t *)dst0, d14, 1); + dst0 += stride; + vst1_lane_s32((int32_t *)dst0, d15, 0); + dst0 += stride; + vst1_lane_s32((int32_t *)dst0, d15, 1); + return; +} |