Displaying 2 results from an estimated 2 matches for "max_unsigned".
2014 Jan 16
3
[LLVMdev] Loop unrolling opportunity in SPEC's libquantum with profile info
...ere an index overflow problem that is preventing us from loading consecutive elements?
Yes, I forgot to mention that. The access is non-consecutive:
for(i=0; i<reg->size; i++)
{
/* Flip the target bit of each basis state */
reg->node[i].state ^= ((MAX_UNSIGNED) 1 << target);
}
The code is writing to the 'state' field. The data structures look like this:
typedef struct quantum_matrix_struct quantum_matrix;
struct quantum_reg_node_struct
{
COMPLEX_FLOAT amplitude; /* alpha_j */
MAX_UNSIGNED state; /* j */
};
typedef struct quantu...
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