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prefetch data in the cache in neon implementation

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8% of average improvement
This commit is contained in:
Carles Fernandez 2016-01-31 10:41:51 +01:00
parent 8a6c4d767f
commit f4875012df
1 changed files with 3 additions and 1 deletions
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4
src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_s32fc_x2_rotator_16ic.h
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@ -290,7 +290,9 @@ static inline void volk_gnsssdr_16ic_s32fc_x2_rotator_16ic_neon(lv_16sc_t* outVe
for(; i < neon_iters; ++i)
{
/* load 4 complex numbers (int 16 bits each component) */
tmp16 = vld2_s16((int16_t*)_in); _in += 4;
tmp16 = vld2_s16((int16_t*)_in);
__builtin_prefetch(_in + 8);
_in += 4;
/* promote them to int 32 bits */
tmp32i.val[0] = vmovl_s16(tmp16.val[0]);