[llvm-bugs] [Bug 38149] New: [InstCombine][DagCombine] Improve Signed Truncation Check pattern

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=38149

            Bug ID: 38149
           Summary: [InstCombine][DagCombine] Improve Signed Truncation
                    Check pattern
           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

As disscussed in https://reviews.llvm.org/D49179#1158957 and later:
https://rise4fun.com/Alive/Bd4 <- the ir can be improved
https://godbolt.org/g/xbCLBB   <- the backend will likely want to revert that
always.

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