Caio Oliveira
ef8553082e
This is a preparation to (re-)enable opt_zero_samples(), which will reduce a SEND mlen before we split it. When that happen, opt_split_sends() won't be able to rely on the fact that mlen covers the entire LOAD_PAYLOAD. Since we are changing that, take the opportunity to also not modify the existing LOAD_PAYLOAD, just create two new ones with the exact set of sources. This allows the pass to be further simplified by iterating forward and not require live_variables analysis. The helper function was added so can be used later for opt_zero_samples(). Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25742>