http://d.puremagic.com/issues/show_bug.cgi?id=6537

           Summary: OS X optimizer bug (?)
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Mac OS X
            Status: NEW
          Severity: major
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: code@klickverbot.at


--- Comment #0 from klickverbot <code@klickverbot.at> 2011-08-20 06:47:28 PDT ---
to!string() seems to produce wrong results with -O using current DMD here on my
OS X Lion box:

---
import std.conv;
import std.stdio;

void main() {
  writefln("%s %s", long.min, to!string(long.min));
}
---

If I build the snippet without compiler flags, it prints (as expected): -9223372036854775808 -9223372036854775808

If I add -O, however, the output becomes: -9223372036854775808 -9223372032559808512

It seems like the lower 32 bits are zeroed out in the to!string() version (the
problem occurs also when to!string is used in isolation, the writefln is just
for demonstrative purposes).

Interestingly, this only occurs on my OS X box, I can't reproduce this in a Linux VM (neither on x86 nor x86_64).

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klickverbot <code@klickverbot.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code


--- Comment #1 from klickverbot <code@klickverbot.at> 2011-08-20 07:02:42 PDT ---
This also happens when explicitly using GCC 4.2, so it's not a case of DMD getting miscompiled by LLVM-GCC/Clang.

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Jacob Carlborg <doob@me.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |doob@me.com


--- Comment #2 from Jacob Carlborg <doob@me.com> 2011-08-20 08:26:16 PDT ---
I can reproduce it on Mac OS X 10.6.8.

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klickverbot <code@klickverbot.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|major                       |critical


--- Comment #3 from klickverbot <code@klickverbot.at> 2011-08-20 08:28:40 PDT ---
Thanks Jacob, raising the importance to critical.

It seems to happen for numbers smaller than int.min, but I haven't scanned the whole range or anything.

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--- Comment #4 from klickverbot <code@klickverbot.at> 2011-08-20 08:31:14 PDT ---
Forgot to mention: I'm at DMD c98b611, druntime a59dd37, Phobos dff57f1.

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--- Comment #5 from Jacob Carlborg <doob@me.com> 2011-08-20 08:53:54 PDT ---
I'm using the 2.054 release.

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Don <clugdbug@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug@yahoo.com.au


--- Comment #6 from Don <clugdbug@yahoo.com.au> 2011-10-13 23:18:02 PDT ---
This sounds a lot like bug 5364.

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugzilla@digitalmars.com


--- Comment #7 from Walter Bright <bugzilla@digitalmars.com> 2011-11-18 00:59:46 PST ---
(In reply to comment #6)
> This sounds a lot like bug 5364.

Since 5364 is fixed now, please try it again on OS X.

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klickverbot <code@klickverbot.at> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE


--- Comment #8 from klickverbot <code@klickverbot.at> 2011-11-18 08:32:03 PST ---
Fixed in Git master.

*** This issue has been marked as a duplicate of issue 5364 ***

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