[llvm-bugs] [Bug 34502] New: Regalloc assert fails: Unexpected VNI

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34502

            Bug ID: 34502
           Summary: Regalloc assert fails: Unexpected VNI
           Product: libraries
           Version: 3.9
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19112
  --> https://bugs.llvm.org/attachment.cgi?id=19112&action=edit
reduced testcase

This is actually a bug that may have kept the SystemZ build bots red for some
time now, but due to vacations this has not been reported yet. So this is quite
urgent.

I have done a git bisect, and found that it seems that commit 463fa38
(trunk at 311401) is the cause for this.

The attached reduced test case fails with that commit, but compiles if it's
reverted.

bin/llc -mcpu=z13 -O3 hoistspills_crash.ll

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