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2014 Jan 16
3
[LLVMdev] Loop unrolling opportunity in SPEC's libquantum with profile info
...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.
2014 Jan 16
3
[LLVMdev] Loop unrolling opportunity in SPEC's libquantum with profile info
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