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adding neon implementation

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This commit is contained in:
Carles Fernandez 2016-01-25 20:53:02 +01:00
parent ba8f0e86b2
commit 1d9fc3ceae
1 changed files with 35 additions and 0 deletions
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35
src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_8ic_conjugate_8ic.h
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@ -304,4 +304,39 @@ static inline void volk_gnsssdr_8ic_conjugate_8ic_u_orc(lv_8sc_t* cVector, const
} }
#endif /* LV_HAVE_ORC */ #endif /* LV_HAVE_ORC */
#ifdef LV_HAVE_NEON
#include <arm_neon.h>
/*!
\brief Takes the conjugate of an unsigned char vector.
\param cVector The vector where the results will be stored
\param aVector Vector to be conjugated
\param num_points The number of unsigned char values in aVector to be conjugated and stored into cVector
*/
static inline void volk_gnsssdr_8ic_conjugate_8ic_neon(lv_8sc_t* cVector, const lv_8sc_t* aVector, unsigned int num_points)
{
const unsigned int sse_iters = num_points / 8;
lv_8sc_t* c = cVector;
const lv_8sc_t* a = aVector;
int8x8x2_t a_val;
for (unsigned int i = 0; i < sse_iters; ++i)
{
a_val = vld2_s8((const int8_t*)a);
__builtin_prefetch(a + 16);
a_val.val[1] = vneg_s8(a_val.val[1]);
vst2_s8((int8_t*)c, a_val);
a += 8;
c += 8;
}
for (unsigned int i = sse_iters * 8; i < num_points; ++i)
{
*c++ = lv_conj(*a++);
}
}
#endif /* LV_HAVE_NEON */
#endif /* INCLUDED_volk_gnsssdr_8ic_conjugate_8ic_H */ #endif /* INCLUDED_volk_gnsssdr_8ic_conjugate_8ic_H */