[llvm-bugs] [Bug 36270] New: [ValueTracking] Crash in computeKnownBitsFromAssume

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36270

            Bug ID: 36270
           Summary: [ValueTracking] Crash in computeKnownBitsFromAssume
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: llvm-dev at redking.me.uk
                CC: llvm-bugs at lists.llvm.org

Reduced from https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=6033

define void @bar4(i32 %b) {
entry:
  %B7 = xor i32 -1, 2147483647
  %and1 = and i32 %b, 3
  %B12 = lshr i32 %B7, %and1
  %C1 = icmp ult i32 %and1, %B12
  tail call void @llvm.assume(i1 %C1)
  %cmp2 = icmp eq i32 0, %B12
  tail call void @llvm.assume(i1 %cmp2)
  unreachable
}
declare void @llvm.assume(i1)

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