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***********************************************************************/ #ifdef HAVE_CONFIG_H #include"config.h" #endif
/*TODO: Convert these once in advance instead of once per sample, like
silk_noise_shape_quantizer_short_prediction_neon() does.*/
int16x8_t coef16 = vld1q_s16(coef);
int32x4_t coef0 = vmovl_s16(vget_low_s16(coef16));
int32x4_t coef1 = vmovl_s16(vget_high_s16(coef16));
/*This is not bit-exact with the C version, since we do not drop the lower 16 bits of each multiply, but wait until the end to truncate precision. This is an encoder-specific calculation (and unlike silk_noise_shape_quantizer_short_prediction_neon(), is not meant to simulate what the decoder will do). We still could use vqdmulhq_s32() like silk_noise_shape_quantizer_short_prediction_neon() and save half the multiplies, but the speed difference is not large, since we
then need two extra adds.*/
int64x2_t b0 = vmull_s32(vget_low_s32(a0), vget_low_s32(coef0));
int64x2_t b1 = vmlal_s32(b0, vget_high_s32(a0), vget_high_s32(coef0));
int64x2_t b2 = vmlal_s32(b1, vget_low_s32(a1), vget_low_s32(coef1));
int64x2_t b3 = vmlal_s32(b2, vget_high_s32(a1), vget_high_s32(coef1));
int64x1_t c = vadd_s64(vget_low_s64(b3), vget_high_s64(b3));
int64x1_t cS = vrshr_n_s64(c, 15);
int32x2_t d = vreinterpret_s32_s64(cS);
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