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replace standards-wobbling variable-length-arrays with alloca()

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Paul Davis 2014-01-27 13:53:15 -05:00
parent b8d31a370a
commit 10d577146a
1 changed files with 16 additions and 7 deletions
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23
libs/panners/vbap/vbap_speakers.cc
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@ -34,6 +34,7 @@
#include <cmath>
#include <algorithm>
#include <stdlib.h>
#include <alloca.h>
#include "pbd/cartesian.h"
@ -115,10 +116,14 @@ VBAPSpeakers::choose_speaker_triplets(struct ls_triplet_chain **ls_triplets)
int i,j,k,l,table_size;
int n_speakers = _speakers.size ();
int connections[n_speakers][n_speakers];
float distance_table[((n_speakers * (n_speakers - 1)) / 2)];
int distance_table_i[((n_speakers * (n_speakers - 1)) / 2)];
int distance_table_j[((n_speakers * (n_speakers - 1)) / 2)];
/* variable length arrays arrived in C99, became optional in C11, and
are only planned for C++14. Use alloca which is functionally
identical (but uglier to read).
*/
int** connections = (int**) alloca (sizeof (int) * n_speakers * n_speakers);
float* distance_table = (float *) alloca (sizeof (float) * ((n_speakers * (n_speakers - 1)) / 2));
int* distance_table_i = (int *) alloca (sizeof (int) * ((n_speakers * (n_speakers - 1)) / 2));
int* distance_table_j = (int *) alloca (sizeof (int) * ((n_speakers * (n_speakers - 1)) / 2));
float distance;
struct ls_triplet_chain *trip_ptr, *prev, *tmp_ptr;
@ -527,9 +532,13 @@ VBAPSpeakers::choose_speaker_pairs (){
*/
const int n_speakers = _speakers.size();
const double AZIMUTH_DELTA_THRESHOLD_DEGREES = (180.0/M_PI) * (M_PI - 0.175);
int sorted_speakers[n_speakers];
bool exists[n_speakers];
double inverse_matrix[n_speakers][4];
/* variable length arrays arrived in C99, became optional in C11, and
are only planned for C++14. Use alloca which is functionally
identical (but uglier to read).
*/
int* sorted_speakers = (int*) alloca (sizeof (int) * n_speakers);
bool* exists = (bool*) alloca (sizeof(bool) * n_speakers);
double** inverse_matrix = (double**) alloca (sizeof (double) * n_speakers * 4);
int expected_pairs = 0;
int pair;
int speaker;