[llvm-bugs] [Bug 41034] New: [LSR] Add bitwidth to formula to properly do wrapping arithmetic

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=41034

            Bug ID: 41034
           Summary: [LSR] Add bitwidth to formula to properly do wrapping
                    arithmetic
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Loop Optimizer
          Assignee: unassignedbugs at nondot.org
          Reporter: florian_hahn at apple.com
                CC: llvm-bugs at lists.llvm.org

Currently LSR has a mix of wrapping arithmetic (by casting to uint64_t),
overflow checks and UB due to signed overflow.

As Eli suggested https://reviews.llvm.org/D59211, each formula should store the
underlying bit width, so we can do wrapping properly (e.g. if the bitwidth of
the inputs is >64bit)

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