[PATCH] D29436: RegisterCoalescer: Fix joinReservedPhysReg()

[Matthias Braun via Phabricator via llvm-commits]

MatzeB created this revision.
Herald added a subscriber: mcrosier.

joinReservedPhysReg() assumed to have a linear program flow between def
and use with a linear sequence of slotindexes. This would fail in
the presence of complicated control flow and is fixed here.

rdar://30306405


Repository:
  rL LLVM

https://reviews.llvm.org/D29436

Files:
  lib/CodeGen/RegisterCoalescer.cpp
  test/CodeGen/AArch64/regcoal-physreg.mir

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