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3008bee7d9
This solves the problem of having a kill flag inside a loop
with a definition of the register prior to the loop:
%vreg368<def> ...
Inside loop:
%vreg520<def> = COPY %vreg368
%vreg568<def,tied1> = add %vreg341<tied0>, %vreg520<kill>
=> was coalesced into =>
%vreg568<def,tied1> = add %vreg341<tied0>, %vreg368<kill>
MachineVerifier then complained:
*** Bad machine code: Virtual register killed in block, but needed live out. ***
The kill flag for %vreg368 is incorrect, and is cleared by this patch.
This is similar to the clearing done at the end of
MachineSinking::SinkInstruction().
Patch provided by Jonas Paulsson.
Reviewed by Quentin Colombet and Juergen Ributzka.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217427 91177308-0d34-0410-b5e6-96231b3b80d8