Some stackslots are allocated to vregs which have no real reference.
LiveRangeEdit::eliminateDeadDef is used to remove dead define instructions
after rematerialization. To remove a VNI for a vreg from its LiveInterval,
LiveIntervals::removeVRegDefAt is used. However, after non-PHI VNIs are all
removed, PHI VNI are still left in the LiveInterval. Such unused vregs will
be kept in RegsToSpill[] at the end of InlineSpiller::reMaterializeAll and
spiller will allocate stackslot for them.
The fix is to get rid of unused reg by checking whether it has non-dbg
reference instead of whether it has non-empty interval.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@259895 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed