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If we ended up with two phi instructions in a block, and we needed to fix up the banks for the first one, we'd end up inserting our COPY before the second phi. E.g. ``` %x = G_PHI ... %fixup = COPY ... %y = G_PHI ... ``` This is invalid MIR, and breaks assumptions made by the register allocator later down the line. With the verifier enabled, it also emits a verification error. This teaches fixupPHIOpBanks to walk past any phi instructions in the block when emitting the fixup copies. Here's an example of the crashing code (same as added testcase): https://godbolt.org/z/h5j1x3o6e Differential Revision: https://reviews.llvm.org/D103582 |
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