Sam Parker 1bd3d00e7e [CodeGen] Check for HardwareLoop Latch ExitBlock ...

The HardwareLoops pass finds exit blocks with a scevable exit count.
If the target specifies to update the loop counter in a register,
through a phi, we need to ensure that the exit block is a latch so
that we can insert the phi with the correct value for the incoming
edge.

Differential Revision: https://reviews.llvm.org/D63336

llvm-svn: 363556

2019-06-17 13:39:28 +00:00

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