[llvm-bugs] [Bug 46376] New: different std::tan() return value in Debug and Release build

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46376

            Bug ID: 46376
           Summary: different std::tan() return value in Debug and Release
                    build
           Product: libc++
           Version: unspecified
          Hardware: Macintosh
                OS: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zsolt.garamvolgyi at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

For specific inputs std::tan() returns different values in Debug and Release.
Here's the code that demonstrates the issue (tested in Xcode 10.3 (10G8) under
macOS Mojave 10.14.6 (18G95)):


#include <cmath>

int main(int argc, const char * argv[]) {
    return std::tan (0.356189668f) == 0.372058868408203f ? 1 : 0;  // returns 1
in Debug
    //return std::tan (0.356189668f) == 0.372058898210526f ? 1 : 0;  // returns
1 in Release
}

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