[patch i386]: For target x86_64-pc-mingw32 _alloca and _stkchk may corrupts stack alignment

[Kai Tietz]

Hi,

This patch fixes two problems for the target x86_64-pc-mingw32 in _alloca 
and a possible problem in _stkchk. The stack alignment on 64-bit Windows 
needs to be on 8 bytes. Otherwise a general exception will be raised. This 
can certain happen for _alloca and may for _chkstk. The other problem is 
that _alloca implementation for _WIN64 does not take care about the 
parameter stack reservation of abi. This leads to a wrong stack pointer.

ChangeLog:

2008-01-28  Kai Tietz  <kai.tietz@onevision.com>

        * gcc/config/i386/cygwin.asm: (__alloca): Correct calling 
convention and alignment.
        (__chkstk): Force 8 byte stack alignment.

Is this fix OK for apply on mainline? 

Regards,
 i.A. Kai Tietz



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