[llvm-bugs] [Bug 33022] New: Options '-optimize-regalloc=false -regalloc=greedy' allowed and failing

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33022

            Bug ID: 33022
           Summary: Options '-optimize-regalloc=false -regalloc=greedy'
                    allowed and failing
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Register Allocator
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

I discovered that the use of these two options made a lot of vregs survive the
greedy register allocator. Eventually this was displayed:

MachineFunctionProperties required by Prologue/Epilogue Insertion & Frame
Finalization pass are not met by function autogen_SD13131.
Required properties: NoVRegs
Current properties: NoPHIs, TracksLiveness
MachineFunctionProperties check failed

My guess is that this is something that would never work. It seems to me that
perhaps this combination of options should not be allowed, in case a novice
user happens to try it?

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