[LLVMbugs] [Bug 19263] New: Instcombine drops nsw when combining adds into mul

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=19263

            Bug ID: 19263
           Summary: Instcombine drops nsw when combining adds into mul
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: clattner at apple.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

John Regehr points out that instcombine is missing an opportunity to preserve
nsw on adds when forming muls:
http://blog.regehr.org/archives/1122

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