Sam Parker 28166816b0 [ARM][ReachingDefs] Remove dead code in loloops. ...

Add some more helper functions to ReachingDefs to query the uses of
a given MachineInstr and also to query whether two MachineInstrs use
the same def of a register.

For Arm, while tail-predicating, these helpers are used in the
low-overhead loops to remove the dead code that calculates the number
of loop iterations.

Differential Revision: https://reviews.llvm.org/D70240

2019-11-26 10:27:46 +00:00

9.2 KiB

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