[llvm-bugs] [Bug 51306] New: [InstCombine] Failure to narrow splatting shifts

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=51306

            Bug ID: 51306
           Summary: [InstCombine] Failure to narrow splatting shifts
           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

Extension of, https://bugs.llvm.org/show_bug.cgi?id=51305
https://alive2.llvm.org/ce/z/Ris5vE
we manage to push truncation through math, but not the shifty variant of the
pattern.

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