[oneAPI samples][Fourier correlation] Using std::fabs(float) in Fourier correlation samples

Author: raphael-egan

Libraries/oneMKL/fourier_correlation/fcorr_1d_buffers.cpp

@@ -164,7 +164,7 @@ int main(int argc, char **argv) {
   float max_corr = corr_acc[0];
   int optimal_shift = 0;
   for (size_t s = 0; s < N; s++) {
-    const float local_err = fabs(naive_corr_acc[s] - corr_acc[s]);
+    const float local_err = std::fabs(naive_corr_acc[s] - corr_acc[s]);
     if (local_err > max_err)
       max_err = local_err;
     if (max_err > max_err_threshold) {

Libraries/oneMKL/fourier_correlation/fcorr_1d_usm.cpp

@@ -156,7 +156,7 @@ int main(int argc, char** argv) {
   float max_corr = corr[0];
   int optimal_shift = 0;
   for (size_t s = 0; s < N; s++) {
-    const float local_err = fabs(naive_corr[s] - corr[s]);
+    const float local_err = std::fabs(naive_corr[s] - corr[s]);
     if (local_err > max_err)
       max_err = local_err;
     if (max_err > max_err_threshold) {

Libraries/oneMKL/fourier_correlation/fcorr_2d_usm.cpp

@@ -253,7 +253,7 @@ int main(int argc, char **argv) {
     for (size_t p = 0; p < n_cols && return_code == 0; p++) {
       const float naive_val = naive_corr[s * col_stride_fwd_domain + p];
       const float dft_val   = corr[s * col_stride_fwd_domain + p];
-      const float local_err = fabs(naive_val - dft_val);
+      const float local_err = std::fabs(naive_val - dft_val);
       if (local_err > max_err)
         max_err = local_err;
       if (max_err > max_err_threshold) {