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7db6fb7f0a
The idea here is to eliminate the flag used for the select condition, not eliminate other flag sources. Previously, if we had an instruction like: gpr = SEL <not in flag> 0 <already in flag> we would process source 0 and try to rewrite_without_flags(). Because it's not in a flag, we think eliminating flags would be useful, so we rewrite it. But this only eliminates the source 2 selection flag, not the source 0 flag. It's valid to do so (but debatably useful). However, we thought we were done, and skipped the setup that ensures source 0's value was actually loaded into a flag. Instead, we should just perform this optimization when processing the selection flag (source 2). By that point, we will have properly set up any flags for sources 0 and 1. And if source 2 is not in a flag, we can decide to rewrite without it. Or, if it's already in a flag, we can keep it as-is. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/42056> |
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