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digitalmars.D.bugs - [Issue 18534] New: Wrong code for ?: operator when compiling with -O


          Issue ID: 18534
           Summary: Wrong code for ?: operator when compiling with -O
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: dmd
          Assignee: nobody puremagic.com
          Reporter: hsteoh quickfur.ath.cx

auto foo(int invert)
    import std.format : format;
    return format("%c", invert ? 'A' : 'A');
void main()
    auto s = foo(0);
    assert(s == "A"); // assertion fails

Compile command:
dmd -O -run test.d

Inspecting the contents of s reveals that instead of containing the character
'A', it contains 0xFF instead.

Compiling without -O fixes the problem.  Replacing the conditional with just
'A' also makes the problem go away.  Seems like -O generates wrong code for the
?: operator.

Feb 27 2018