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2020 Jul 17
4
Allowed operations for passes that report "no change"
I’m digging through a build failure [1], and it looks like the loop idiom recognizer adds some instructions [2], and then removes them again [3]. I don’t understand why yet, but the LegacyPassManager detects that the structural hash of the function has changed, and complains that the pass didn’t correctly report that it changed the function [4] (even though materially, it didn’t). This raises a