[llvm-bugs] [Bug 30550] New: LLVM's Global Value Numbering pass bug

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=30550

            Bug ID: 30550
           Summary: LLVM's Global Value Numbering pass bug
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: Anton.Baliasnikov at synopsys.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 17373
  --> https://llvm.org/bugs/attachment.cgi?id=17373&action=edit
tst function have to return 0, but returns 1 with O2, O3 and inlining

With inlining and performance optimization (O2 and O3) clang optimize away some
part of code and return the wrong value.

Compile the attached test with the following command line:
) clang -Wall -std=c++14 -stdlib=libc++ -O3 -o a.out test.cpp
the test will fail.

The test passes with -fno-inline-functions or -O0.

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