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This is still an issue, and kind of makes go/ssa unusable for a lot of its users. Is there a way to get this on the radar of the people who actually understand the code?
The problem seems to be that the reachability part of φ-elimination considers only "new phis" and ignores φ-nodes already present due to && and || operators. I'll prepare a fix. Sorry for the delay.
Input file:
ssadump on 219e654~1 (last working commit):
ssadump on 219e654 (first broken commit):
Problem:
t0 - the result of the assignment to distinctSpans - isn't being used, block 2 is missing a phi node, and the phi node t1 refers to an ominous t1000.
/cc @alandonovan
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