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nir/opt_loop_unroll: Avoid list_length

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It is O(N) but can often be replaced with something O(1).

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Faith Ekstrand <faith.ekstrand@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22343>
This commit is contained in:
Alyssa Rosenzweig 2023-04-06 15:31:59 -04:00 • committed by Marge Bot
parent 7356f3eee7
commit 8505f0bd84
1 changed files with 4 additions and 4 deletions
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8
src/compiler/nir/nir_opt_loop_unroll.c
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@ -466,7 +466,7 @@ complex_unroll(nir_loop *loop, nir_loop_terminator *unlimit_term,
static void
complex_unroll_single_terminator(nir_loop *loop)
{
assert(list_length(&loop->info->loop_terminator_list) == 1);
assert(list_is_singular(&loop->info->loop_terminator_list));
assert(loop->info->limiting_terminator);
assert(nir_is_trivial_loop_if(loop->info->limiting_terminator->nif,
loop->info->limiting_terminator->break_block));
@ -717,7 +717,7 @@ remove_out_of_bounds_induction_use(nir_shader *shader, nir_loop *loop,
static void
partial_unroll(nir_shader *shader, nir_loop *loop, unsigned trip_count)
{
assert(list_length(&loop->info->loop_terminator_list) == 1);
assert(list_is_singular(&loop->info->loop_terminator_list));
nir_loop_terminator *terminator =
list_first_entry(&loop->info->loop_terminator_list,
@ -1043,8 +1043,8 @@ process_loops(nir_shader *sh, nir_cf_node *cf_node, bool *has_nested_loop_out,
/* If we were able to guess the loop iteration based on array access
* then do a partial unroll.
*/
unsigned num_lt = list_length(&loop->info->loop_terminator_list);
if (!has_nested_loop && num_lt == 1 && !loop->partially_unrolled &&
bool one_lt = list_is_singular(&loop->info->loop_terminator_list);
if (!has_nested_loop && one_lt && !loop->partially_unrolled &&
loop->info->guessed_trip_count &&
check_unrolling_restrictions(sh, loop)) {
partial_unroll(sh, loop, loop->info->guessed_trip_count);