tree e0d9b1bb987308d23a9651cae81ac1d2bd9a3a34
parent 6709348e9f65d8fbead4f2d25f9cc174edc075d9
author Jeremy Morse <jeremy.morse.llvm@gmail.com> 1541177568 +0000
committer Jeremy Morse <jeremy.morse.llvm@gmail.com> 1541177568 +0000

[MachineSink][DebugInfo] Correctly sink DBG_VALUEs

As reported in PR38952, postra-machine-sink relies on DBG_VALUE insns being
adjacent to the def of the register that they reference. This is not always
true, leading to register copies being sunk but not the associated DBG_VALUEs,
which gives the debugger a bad variable location.

This patch collects DBG_VALUEs as we walk through a BB looking for copies to
sink, then passes them down to performSink. Compile-time impact should be
negligable.

Differential Revision: https://reviews.llvm.org/D53992


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345996 91177308-0d34-0410-b5e6-96231b3b80d8