Summary: This invariant is being violated in the test case https://reviews.llvm.org/D77849, related to the use of the relatively new ability for callbr to have return values, and MachineBasicBlocks with INLINEASM_BR terminators to emit live out register defs. As noted in the comment, this triggers invariant violations in MachineVerifier via `llc -verify-machineinstrs` or `llc -verify-regalloc`, since only MachineInstrs that are terminators are allowed to follow the first terminator. https://reviews.llvm.org/D75098 may rework this very assertion if we're spilling via a (proposed) TCOPY MachineInstr. Reviewers: void, efriedma, arsenm Reviewed By: efriedma Subscribers: qcolombet, wdng, hiraditya, llvm-commits, srhines Tags: #llvm Differential Revision: https://reviews.llvm.org/D78166
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