Dave Bartolomeo 56bb9dcde0 C++: Remove infeasible edges to reachable blocks ...

The existing unreachable IR removal code only retargeted an infeasible edge to an `Unreached` instruction if the successor of the edge was an unreachable block. This is too conservative, because it doesn't remove an infeasible edge that targets a block that is still reachable via other paths. The trivial example of this is `do { } while (false);`, where the back edge is infeasible, but the body block is still reachable from the loop entry.

This change retargets all infeasible edges to `Unreached` instructions, regardless of the reachability of the successor block.

2018-12-14 12:13:22 -08:00

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identical-files.json

C++: Remove infeasible edges to reachable blocks

2018-12-14 12:13:22 -08:00