[llvm-bugs] [Bug 42563] New: [InstCombine] Dropping pointless masking before left shift

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42563

            Bug ID: 42563
           Summary: [InstCombine] Dropping pointless masking before left
                    shift
           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

Splitting off from https://bugs.llvm.org/show_bug.cgi?id=42456 just
so i can track them separately.

There's a bunch of patterns, even if we only look at 'masking'-like pattern.
I guess i'm stumbling into a deep untouched woods that no one had in hotpaths..

a,b:     https://rise4fun.com/Alive/4zsf
c,d,e,f: https://rise4fun.com/Alive/RC49

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