Matthias Braun b8817825b9 Support critical edge splitting for jump tables ...

Add support for splitting critical edges coming from an indirect jump
using a jump table ("switch jumps").

This introduces the `TargetInstrInfo::getJumpTableIndex` callback to
allows targets to return an index into `MachineJumpTableInfo` for a
given indirect jump. It also updates to
`MachineBasicBlock::SplitCriticalEdge` to allow splitting of critical
edges by rewriting jump table entries.

This is largely based on work done by Zhixuan Huan in D132202.

Differential Revision: https://reviews.llvm.org/D140975

2023-05-10 20:30:52 -07:00

59 KiB

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