[hamradio-commits] [gnss-sdr] 72/236: prefetching data in the cache

[Carles Fernandez]

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carles_fernandez-guest pushed a commit to branch next
in repository gnss-sdr.

commit 59011a77724193203e230a54c352094e8a990145
Author: Carles Fernandez <carles.fernandez at gmail.com>
Date:   Mon Mar 7 19:57:22 2016 +0100

    prefetching data in the cache
---
 .../kernels/volk_gnsssdr/volk_gnsssdr_16ic_x2_dot_prod_16ic_xn.h        | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_x2_dot_prod_16ic_xn.h b/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_x2_dot_prod_16ic_xn.h
index 571b1c7..6571d58 100644
--- a/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_x2_dot_prod_16ic_xn.h
+++ b/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/kernels/volk_gnsssdr/volk_gnsssdr_16ic_x2_dot_prod_16ic_xn.h
@@ -107,6 +107,7 @@ static inline void volk_gnsssdr_16ic_x2_dot_prod_16ic_xn_a_sse2(lv_16sc_t* resul
                 {
                     // b[127:0]=[a3.i,a3.r,a2.i,a2.r,a1.i,a1.r,a0.i,a0.r]
                     b = _mm_load_si128((__m128i*)_in_common); //load (2 byte imag, 2 byte real) x 4 into 128 bits reg
+                    __builtin_prefetch(_in_common + 8);
                     for (int n_vec = 0; n_vec < num_a_vectors; n_vec++)
                         {
                             a = _mm_load_si128((__m128i*)&(_in_a[n_vec][number*4])); //load (2 byte imag, 2 byte real) x 4 into 128 bits reg
@@ -204,6 +205,7 @@ static inline void volk_gnsssdr_16ic_x2_dot_prod_16ic_xn_u_sse2(lv_16sc_t* resul
                 {
                     // b[127:0]=[a3.i,a3.r,a2.i,a2.r,a1.i,a1.r,a0.i,a0.r]
                     b = _mm_loadu_si128((__m128i*)_in_common); //load (2 byte imag, 2 byte real) x 4 into 128 bits reg
+                    __builtin_prefetch(_in_common + 8);
                     for (int n_vec = 0; n_vec < num_a_vectors; n_vec++)
                         {
                             a = _mm_loadu_si128((__m128i*)&(_in_a[n_vec][number*4])); //load (2 byte imag, 2 byte real) x 4 into 128 bits reg

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