[llvm-bugs] [Bug 42019] New: Do not count some intrinsics in use-checking

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42019

            Bug ID: 42019
           Summary: Do not count some intrinsics in use-checking
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: david.bolvansky at gmail.com
                CC: llvm-bugs at lists.llvm.org

As noted in D61409, with llvm.assume (and some other intrinsics) we may cause
regressions, instead of expected (since llvm.assume is designed as a way to
pass hints to compiler) improvements. One-use-check currently is not so smart
about intrinsics which are dropped when the call is dropped during back-end
lowering.

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