93369c2470
+ Add a small cleanup script (build/tools/cleanup-apps.sh) + Minor formatting of hello-gl2 sample.
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
#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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