c817c5210e
The idea is to allow developing the NDK in the open, while having the platforms and samples under a private branch until the corresponding release are open-sourced. Change-Id: Iee995fb6c4d3ee1387dea7486e599e079c9e4c6d
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include "helloneon-intrinsics.h"
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#include <arm_neon.h>
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/* this source file should only be compiled by Android.mk when targeting
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* the armeabi-v7a ABI, and should be built in NEON mode
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*/
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void
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fir_filter_neon_intrinsics(short *output, const short* input, const short* kernel, int width, int kernelSize)
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{
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#if 1
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int nn, offset = -kernelSize/2;
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for (nn = 0; nn < width; nn++)
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{
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int mm, sum = 0;
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int32x4_t sum_vec = vdupq_n_s32(0);
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for(mm = 0; mm < kernelSize/4; mm++)
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{
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int16x4_t kernel_vec = vld1_s16(kernel + mm*4);
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int16x4_t input_vec = vld1_s16(input + (nn+offset+mm*4));
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sum_vec = vmlal_s16(sum_vec, kernel_vec, input_vec);
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}
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sum += vgetq_lane_s32(sum_vec, 0);
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sum += vgetq_lane_s32(sum_vec, 1);
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sum += vgetq_lane_s32(sum_vec, 2);
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sum += vgetq_lane_s32(sum_vec, 3);
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if(kernelSize & 3)
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{
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for(mm = kernelSize - (kernelSize & 3); mm < kernelSize; mm++)
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sum += kernel[mm] * input[nn+offset+mm];
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}
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output[nn] = (short)((sum + 0x8000) >> 16);
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}
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#else /* for comparison purposes only */
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int nn, offset = -kernelSize/2;
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for (nn = 0; nn < width; nn++) {
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int sum = 0;
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int mm;
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for (mm = 0; mm < kernelSize; mm++) {
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sum += kernel[mm]*input[nn+offset+mm];
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}
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output[n] = (short)((sum + 0x8000) >> 16);
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}
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#endif
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}
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