[llvm-bugs] [Bug 31613] New: NewGVN asserts, "instruction processed too many times"

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=31613

            Bug ID: 31613
           Summary: NewGVN asserts, "instruction processed too many times"
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: davide at freebsd.org
                CC: dberlin at dberlin.org, llvm-bugs at lists.llvm.org
            Blocks: 30995
    Classification: Unclassified

Reduced from one of our games (game7, for the archives).

define void @patatino() {
entry:
  br label %while.body

while.body:                                       ; preds =
%while.end129.loopexit, %entry
  %foo.0237 = phi i32 [ 0, %entry ], [ -1, %while.end129.loopexit ]
  br label %while.cond22.outer

while.cond22.outer:                               ; preds = %while.cond38,
%while.body
  %foo.1.ph211 = phi i32 [ %foo.0237, %while.body ], [ %foo.2, %while.cond38 ]
  br label %while.cond22.outer212

while.cond22.outer212:                            ; preds = %if.else,
%while.cond22.outer
  %foo.1.ph214 = phi i32 [ %foo.1.ph211, %while.cond22.outer ], [
%foo.2.lcssa253, %if.else ]
  br i1 undef, label %while.end129.loopexit, label %if.end31.us

if.end31.us:                                      ; preds =
%while.cond22.outer212
  br label %while.body37

while.body37:                                     ; preds = %cleanup,
%if.end31.us
  %foo.2 = phi i32 [ %foo.4, %cleanup ], [ %foo.1.ph214, %if.end31.us ]
  br label %while.cond38

while.cond38:                                     ; preds = %land.rhs47,
%while.body37
  switch i8 undef, label %land.rhs47 [
    i8 0, label %while.cond22.outer
    i8 10, label %lor.lhs.false
  ]

land.rhs47:                                       ; preds = %while.cond38
  br label %while.cond38

lor.lhs.false:                                    ; preds = %while.cond38
  br i1 undef, label %if.then70, label %if.else

if.then70:                                        ; preds = %lor.lhs.false
  br i1 undef, label %if.then77, label %cleanup

if.then77:                                        ; preds = %if.then70
  br label %cleanup

if.else:                                          ; preds = %lor.lhs.false
  %foo.2.lcssa253 = phi i32 [ %foo.2, %lor.lhs.false ]
  br label %while.cond22.outer212

cleanup:                                          ; preds = %if.then77,
%if.then70
  %foo.4 = phi i32 [ undef, %if.then77 ], [ %foo.2, %if.then70 ]
  br label %while.body37

while.end129.loopexit:                            ; preds =
%while.cond22.outer212
  br label %while.body
}

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