[llvm-bugs] [Bug 36062] New: -Wfloat-equal not always recognized

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jan 23 08:55:45 PST 2018


https://bugs.llvm.org/show_bug.cgi?id=36062

            Bug ID: 36062
           Summary: -Wfloat-equal not always recognized
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: ag at arvid.io
                CC: llvm-bugs at lists.llvm.org

The following is not issuing the '-Wfloat-equal' warning: `(x + y) != 0.0f`. If
`0.0f` is changed into `0`, it's issued. 
This seems to be somewhat related to
https://bugs.llvm.org/show_bug.cgi?id=23717.
While I agree with the rationale presented in the previously linked ticket,
comparing to zero after an operation is still potentially unsafe.

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