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Change loop order to maximize cache hit

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It is better to write to memory that are grouped together to reduce
probability of cache miss. This simple change improved the function's
execution speed by 70%.

Removed the unnecessary memset for the buffer.
This commit is contained in:
Sakthivel Velumani
2024-09-03 09:18:26 +02:00
committed by francescomani
parent 9c8bdd6db5
commit 2b7e0a0519
3 changed files with 6 additions and 7 deletions
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openair1/PHY/MODULATION/nr_modulation.c
+3 -3
View File
@@ -318,10 +318,10 @@ void nr_layer_mapping(int nbCodes,
}
}
void nr_ue_layer_mapping(const c16_t *mod_symbs, const int n_layers, const int n_symbs, int sz, c16_t tx_layers[][sz])
void nr_ue_layer_mapping(const c16_t *mod_symbs, const int n_layers, const int n_symbs, c16_t tx_layers[][n_symbs])
{
for (int i=0; i<n_symbs/n_layers; i++) {
for (int l=0; l<n_layers; l++) {
for (int l = 0; l < n_layers; l++) {
for (int i = 0; i < n_symbs; i++) {
tx_layers[l][i] = c16mulRealShift(mod_symbs[n_layers * i + l], AMP, 15);
}
}
openair1/PHY/MODULATION/nr_modulation.h
+1 -1
View File
@@ -69,7 +69,7 @@ void nr_layer_mapping(int nbCodes,
@param[in] n_symbs, number of modulated symbols
@param[out] tx_layers, modulated symbols for each layer
*/
void nr_ue_layer_mapping(const c16_t *mod_symbs, const int n_layers, const int n_symbs, int sz, c16_t tx_layers[][sz]);
void nr_ue_layer_mapping(const c16_t *mod_symbs, const int n_layers, const int n_symbs, c16_t tx_layers[][n_symbs]);
/*!
\brief This function implements the OFDM front end processor on reception (FEP)
\param frame_parms Pointer to frame parameters
openair1/PHY/NR_UE_TRANSPORT/nr_ulsch_ue.c
+2 -3
View File
@@ -248,11 +248,10 @@ void nr_ue_ulsch_procedures(PHY_VARS_NR_UE *UE,
/////////////////////////ULSCH layer mapping/////////////////////////
///////////
const int sz = available_bits / mod_order;
const int sz = available_bits / mod_order / Nl;
c16_t tx_layers[Nl][sz];
memset(tx_layers, 0, sizeof(tx_layers));
nr_ue_layer_mapping(d_mod, Nl, available_bits / mod_order, sz, tx_layers);
nr_ue_layer_mapping(d_mod, Nl, sz, tx_layers);
///////////
////////////////////////////////////////////////////////////////////////