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35a32c5
(Get the code!)
As you said, try_crossjump_bb tries to find the same instruction sequence in *all* predecessors of a basic block bb. Meaning that the load must have been redundant even before cross jumping occurred.
If you are right, and this redundancy is not exposed until after register allocation, then this may be another case that postreload-gcse should handle (but probably does not).
There are a couple of bugs about the need for a more powerful postreload-gcse. We should perhaps group them (in a meta-bug for example) and make a plan for a fix...