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digitalmars.D.bugs - [Issue 6537] New: OS X optimizer bug (?)

reply d-bugmail puremagic.com writes:
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



---
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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next sibling parent d-bugmail puremagic.com writes:
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klickverbot <code klickverbot.at> changed:

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



---
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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prev sibling next sibling parent d-bugmail puremagic.com writes:
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Jacob Carlborg <doob me.com> changed:

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



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



---
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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---
Forgot to mention: I'm at DMD c98b611, druntime a59dd37, Phobos dff57f1.

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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



This sounds a lot like bug 5364.

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Oct 13 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
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Walter Bright <bugzilla digitalmars.com> changed:

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



00:59:46 PST ---


 This sounds a lot like bug 5364.


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

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Nov 18 2011
prev sibling parent d-bugmail puremagic.com writes:
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klickverbot <code klickverbot.at> changed:

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



---
Fixed in Git master.

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

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