Dylan Baker
83c52f75d0
Coverity notices that if `util_last_bit()` returns 0, and we subtract 1,
then the unsigned will overflow before being converted. We could cast to
eliminate that error, but the entire optimization function would do
nothing if tex->required_params == 0 (the way that we would get here),
so let's just not do work if we know we don't need to *and* avoid this
overflow.
CID: 1667241
Fixes: efcba73b49 ("brw: switch to new sampler payload description scheme")
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38009>
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