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glsl: add mark_array_elements_referenced() fast path

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Add a fast path for single dimension arrays. This is around 3x
faster on large arrays. For example when testing a shader from
issue 9953 compile time went from ~12 seconds down to ~4 seconds.

Issue: https://gitlab.freedesktop.org/mesa/mesa/-/issues/9953

Acked-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36366>
This commit is contained in:
Timothy Arceri 2025-07-25 13:19:32 +10:00 • committed by Marge Bot
parent 8579c21798
commit cb558b2b88
1 changed files with 18 additions and 0 deletions
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18
src/compiler/glsl/gl_nir_link_uniforms.c
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@ -129,6 +129,24 @@ mark_array_elements_referenced(const struct array_deref_range *dr,
if (count != array_depth)
return;
/* Single dimension array fast path. This is the most common path as most
* arrays are only one dimension. This path is around 3x faster on large
* arrays than _mark_array_elements_referenced().
*/
if (count == 1) {
if (dr[0].size == 0)
return;
if (dr[0].index < dr[0].size) {
BITSET_SET(bits, dr[0].index);
} else {
/* Accessed by non-constant index so set everything as referenced */
BITSET_SET_RANGE(bits, 0, dr[0].size - 1);
}
return;
}
_mark_array_elements_referenced(dr, count, 1, 0, bits);
}