cd9b90ab53
The performance gain on a Nexus 7 reported by audioproc is ~2% See comments regarding the output. R=bjornv@webrtc.org, cd@webrtc.org Review URL: https://webrtc-codereview.appspot.com/21679004 Patch from Scott LaVarnway <slavarnw@gmail.com>. git-svn-id: http://webrtc.googlecode.com/svn/trunk@6564 4adac7df-926f-26a2-2b94-8c16560cd09d
78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
/*
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* Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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/*
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* The rdft AEC algorithm, neon version of speed-critical functions.
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*
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* Based on the sse2 version.
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*/
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#include "webrtc/modules/audio_processing/aec/aec_rdft.h"
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#include <arm_neon.h>
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static const ALIGN16_BEG float ALIGN16_END
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k_swap_sign[4] = {-1.f, 1.f, -1.f, 1.f};
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static void cft1st_128_neon(float* a) {
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const float32x4_t vec_swap_sign = vld1q_f32((float32_t*)k_swap_sign);
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int j, k2;
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for (k2 = 0, j = 0; j < 128; j += 16, k2 += 4) {
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float32x4_t a00v = vld1q_f32(&a[j + 0]);
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float32x4_t a04v = vld1q_f32(&a[j + 4]);
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float32x4_t a08v = vld1q_f32(&a[j + 8]);
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float32x4_t a12v = vld1q_f32(&a[j + 12]);
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float32x4_t a01v = vcombine_f32(vget_low_f32(a00v), vget_low_f32(a08v));
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float32x4_t a23v = vcombine_f32(vget_high_f32(a00v), vget_high_f32(a08v));
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float32x4_t a45v = vcombine_f32(vget_low_f32(a04v), vget_low_f32(a12v));
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float32x4_t a67v = vcombine_f32(vget_high_f32(a04v), vget_high_f32(a12v));
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const float32x4_t wk1rv = vld1q_f32(&rdft_wk1r[k2]);
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const float32x4_t wk1iv = vld1q_f32(&rdft_wk1i[k2]);
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const float32x4_t wk2rv = vld1q_f32(&rdft_wk2r[k2]);
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const float32x4_t wk2iv = vld1q_f32(&rdft_wk2i[k2]);
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const float32x4_t wk3rv = vld1q_f32(&rdft_wk3r[k2]);
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const float32x4_t wk3iv = vld1q_f32(&rdft_wk3i[k2]);
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float32x4_t x0v = vaddq_f32(a01v, a23v);
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const float32x4_t x1v = vsubq_f32(a01v, a23v);
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const float32x4_t x2v = vaddq_f32(a45v, a67v);
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const float32x4_t x3v = vsubq_f32(a45v, a67v);
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const float32x4_t x3w = vrev64q_f32(x3v);
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float32x4_t x0w;
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a01v = vaddq_f32(x0v, x2v);
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x0v = vsubq_f32(x0v, x2v);
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x0w = vrev64q_f32(x0v);
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a45v = vmulq_f32(wk2rv, x0v);
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a45v = vmlaq_f32(a45v, wk2iv, x0w);
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x0v = vmlaq_f32(x1v, x3w, vec_swap_sign);
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x0w = vrev64q_f32(x0v);
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a23v = vmulq_f32(wk1rv, x0v);
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a23v = vmlaq_f32(a23v, wk1iv, x0w);
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x0v = vmlsq_f32(x1v, x3w, vec_swap_sign);
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x0w = vrev64q_f32(x0v);
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a67v = vmulq_f32(wk3rv, x0v);
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a67v = vmlaq_f32(a67v, wk3iv, x0w);
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a00v = vcombine_f32(vget_low_f32(a01v), vget_low_f32(a23v));
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a04v = vcombine_f32(vget_low_f32(a45v), vget_low_f32(a67v));
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a08v = vcombine_f32(vget_high_f32(a01v), vget_high_f32(a23v));
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a12v = vcombine_f32(vget_high_f32(a45v), vget_high_f32(a67v));
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vst1q_f32(&a[j + 0], a00v);
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vst1q_f32(&a[j + 4], a04v);
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vst1q_f32(&a[j + 8], a08v);
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vst1q_f32(&a[j + 12], a12v);
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}
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}
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void aec_rdft_init_neon(void) {
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cft1st_128 = cft1st_128_neon;
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}
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