[hamradio-commits] [gnss-sdr] 138/149: prefetch data in the cache in neon implementation

[Carles Fernandez]

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commit f4875012df9bfa63d1d558376be6cef1f21e952c
Author: Carles Fernandez <carles.fernandez at gmail.com>
Date:   Sun Jan 31 10:41:51 2016 +0100

    prefetch data in the cache in neon implementation
    
    8% of average improvement
---
 .../kernels/volk_gnsssdr/volk_gnsssdr_16ic_s32fc_x2_rotator_16ic.h    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_s32fc_x2_rotator_16ic.h b/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_s32fc_x2_rotator_16ic.h
index 765fac2..21b5477 100644
--- a/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_s32fc_x2_rotator_16ic.h
+++ b/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_s32fc_x2_rotator_16ic.h
@@ -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]);

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