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...atrix_struct quantum_matrix; struct quantum_reg_node_struct { COMPLEX_FLOAT amplitude; /* alpha_j */ MAX_UNSIGNED state; /* j */ }; typedef struct quantum_reg_node_struct quantum_reg_node; /* The quantum register */ struct quantum_reg_struct { int width; /* number of qubits in the qureg */ int size; /* number of non-zero vectors */ int hashw; /* width of the hash array */ quantum_reg_node *node; int *hash; }; If you do the trick of writing to a separate array, then the loop can be vectorized. Diego.

On Wed, Jan 15, 2014 at 5:30 PM, Nadav Rotem <nrotem at apple.com> wrote: > Was the vectorizer successful in unrolling the loop in quantum_sigma_x? I > wonder if 'size’ is typically high or low. No. The vectorizer stated that it wasn't going to bother with the loop because it wasn't profitable. Specifically: LV: Checking a loop in "quantum_sigma_x" LV: Found a