[Bug 22385] New: GCC 4.4.3 miscompiles GDI32 code on Intel Core i3/i5/i7 CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

Summary: GCC 4.4.3 miscompiles GDI32 code on Intel Core
                    i3/i5/i7 CPUs
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdi32
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=27394)
 --> (http://bugs.winehq.org/attachment.cgi?id=27394)
Miranda's dbtool.exe

When wine is compiled with GCC 4.4.3 with the following compiler flags:

export CFLAGS="-march=native -O2 -pipe -ftree-vectorize"

on Intel Core i3/i5/i7 CPUs then some applications start crashing in gdi32
code.

A sample application and a backtrace will be attached.

[Bug 22385] GCC 4.4.3 miscompiles GDI32 code on Intel Core i3/i5/i7 CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

--- Comment #1 from Artem S. Tashkinov   2010-04-17 04:17:30 ---
Created an attachment (id=27395)
 --> (http://bugs.winehq.org/attachment.cgi?id=27395)
Backtrace

[Bug 22385] GCC 4.4.3 miscompiles GDI32 code on Intel Core i3/i5/i7 CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

--- Comment #2 from Artem S. Tashkinov   2010-04-17 04:22:28 ---
For -march=native on Intel Core CPUs GCC 4.4.3 uses the following options:

-march=core2 -mcx16 -msahf -maes -mpclmul -mpopcnt -msse4.2 --param
l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=256
-mtune=core2

So in fact, this bug affects all Intel Core 2 and newer CPUs.

[Bug 22385] GCC 4.4.3 miscompiles GDI32 code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

Artem S. Tashkinov  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|GCC 4.4.3 miscompiles GDI32 |GCC 4.4.3 miscompiles GDI32
                   |code on Intel Core i3/i5/i7 |code for/on Intel Core 2
                   |CPUs                        |and newer CPUs

[Bug 22385] GDI bezier code has unaligned access for SSE registers code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

Marcus Meissner  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]
            Summary|GCC 4.4.3 miscompiles GDI32 |GDI bezier code has
                   |code for/on Intel Core 2    |unaligned access for SSE
                   |and newer CPUs              |registers code for/on Intel
                   |                            |Core 2 and newer CPUs

--- Comment #3 from Marcus Meissner   2010-04-17 04:37:23 ---
Not a GCC Bug I think, but an unaligned access to a MMX/SSE register from Wine
code.

[Bug 22385] GDI bezier code has unaligned access for SSE registers code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

--- Comment #4 from Artem S. Tashkinov   2010-04-17 04:44:43 ---
GCC 4.2.4 resolves -march=native to "-march=nocona -mtune=generic"

[Bug 22385] GDI bezier code has unaligned access for SSE registers code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

--- Comment #5 from Marcus Meissner   2010-04-17 04:47:58 ---
(the stack in GDI_Bezier we received is only 4 byte aligned
so the stack value POINT is only 4 byte aligned
and the SSE store from it then faults.

Usual programs doing SSE need to be in alignment starting from main() on 
(only main auto aligns the stack).

With Win32 code inbetween we would not be able to guarantee this alignment.

So until gcc gets a stack alignment function attribute which it currently hasnt
... this can only work if you disable SSE.

[Bug 22385] GDI bezier code has unaligned access for SSE registers code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

Dmitry Timoshkov  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
          Component|gdi32                       |-unknown
         Resolution|                            |DUPLICATE

--- Comment #6 from Dmitry Timoshkov   2010-04-17 04:53:21 ---
That's a gcc bug.

*** This bug has been marked as a duplicate of bug 22316 ***

[Bug 22385] GDI bezier code has unaligned access for SSE registers code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

Dmitry Timoshkov  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

--- Comment #7 from Dmitry Timoshkov   2010-04-17 04:54:05 ---
In future please specify Wine version you are using. Closing duplicate.

[Bug 22385] GDI bezier code has unaligned access for SSE registers code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

--- Comment #8 from Artem S. Tashkinov   2010-04-17 05:06:07 ---
I couldn't specify wine version, because I've tested last 7 Wine releases and
they all have this problem.

[Bug 22385] GDI bezier code has unaligned access for SSE registers code for/on Intel Core 2 and newer CPUs

http://bugs.winehq.org/show_bug.cgi?id=22385

--- Comment #9 from Dmitry Timoshkov   2010-04-17 05:12:39 ---
(In reply to comment #8)
> I couldn't specify wine version, because I've tested last 7 Wine releases and
> they all have this problem.

At least reporting that, along with last tested version is enough.