[llvm-bugs] [Bug 38622] New: [x86] LLVM no longer generates efficient multiply lowering of divide by constant

via llvm-bugs llvm-bugs at lists.llvm.org
Fri Aug 17 17:35:23 PDT 2018


https://bugs.llvm.org/show_bug.cgi?id=38622

            Bug ID: 38622
           Summary: [x86] LLVM no longer generates efficient multiply
                    lowering of divide by constant
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: chandlerc at gmail.com
                CC: craig.topper at gmail.com, llvm-bugs at lists.llvm.org

https://godbolt.org/g/Y5K2ER

LLVM 6 did the right thing here, trunk appears not to.

Reporting this for Jorg Brown who doesn't yet have an account on bugzilla...

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