• via Digitalmars-d-bugs (31/31) Aug 27 2014 https://issues.dlang.org/show_bug.cgi?id=13383

via Digitalmars-d-bugs <digitalmars-d-bugs puremagic.com> writes:

https://issues.dlang.org/show_bug.cgi?id=13383

          Issue ID: 13383
           Summary: wrong code with -O with ints, longs and bitwise
                    operations
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: DMD
          Assignee: nobody puremagic.com
          Reporter: gassa mail.ru

Consider the following code (minimized example):
-----
void main () {
    foreach (k; 32..33) {
        if (1L & (1L << k)) {
            assert (false);
        }
    }
}
-----

Obviously, 1L & (1L << k) must be true only when k = 0.

Still, with k = 32, it produces a true value when compiled with "dmd -O".

All is well without "-O".

It is reproducible for me with DMD 2.064.2-2.066.0 on Win32.  It works for me
with DMD 2.063.2.  So, the issue was probably introduced between 2.063.2 and
2.064.2.

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