[llvm-bugs] [Bug 38123] New: Combine and-mask+icmp eq -> icmp ule when mask was all-ones in low bits

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38123

            Bug ID: 38123
           Summary: Combine and-mask+icmp eq -> icmp ule when mask was
                    all-ones in low bits
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: lebedev.ri at gmail.com
                CC: llvm-bugs at lists.llvm.org

https://rise4fun.com/Alive/W2u
https://godbolt.org/g/sCX9A6

This pattern will be produced by Implicit Integer Trucation sanitizer,
(https://reviews.llvm.org/D48958)
in unsigned case, therefore it is probably a good idea to improve it.

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