[llvm-bugs] [Bug 34377] New: Clang produces incorrect code with -O1 and higher

via llvm-bugs llvm-bugs at lists.llvm.org
Wed Aug 30 05:15:39 PDT 2017


            Bug ID: 34377
           Summary: Clang produces incorrect code with -O1 and higher
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: Vsevolod.Livinskij at frtk.ru
                CC: llvm-bugs at lists.llvm.org

Created attachment 19059
  --> https://bugs.llvm.org/attachment.cgi?id=19059&action=edit

Clang produces incorrect code with -O1 and higher. -mllvm -opt-bisect-limit
blames "X86 cmov Conversion on function"

>$ clang++ -O1 func.cpp driver.cpp ; ./a.out 
>$ clang++ -O0 func.cpp driver.cpp ; ./a.out 

clang version 6.0.0 (trunk 311997)

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