[LLVMdev] [cfe-dev] Handling SRet on Windows x86

[Eric Christopher]

On Wed, Mar 20, 2013 at 5:21 PM, Timur Iskhodzhanov <timurrrr at google.com>wrote:

> 2013/3/20 Timur Iskhodzhanov <timurrrr at google.com>:
> > Anton,
> >
> > [+Eric, Nick,
> > the e-mail thread context has been broken a few times, so you should
> > probably look at the llvmdev archives.
> > It all starts here:
> > http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-October/053961.html ]
> >
> > So I've decided to make a new attempt to fix this issue.
> >
> > We've discussed my patches with Eric and came up with the following idea:
> > a) IsTargetWindows should be true for all the targets that execute on
> > the Windows kernel, including Cygwin, MinGW and MSVC ABIs.
> >
> > However, "Windows 32-bit ABI" usually implies "MSVC 32-bit ABI", so
> > it's Cygwin and MinGW (that are similar more similar to Itanium ABI
> > than to MSVC ABI) that should be exceptions from the general Win32
> > handling code.
> >
> > That is,
> > b) We should add a IsTargetWin32 which is true if the MSVC 32-bit ABI
> > is used and false for Cygwin+MinGW.
> FTR, there's already such a method but it is (mis?)used only in
> lib/Target/X86/X86FrameLowering.cpp for segmented stacks.
> Are segmented stacks actually used with MSVC or is it just the
> conditions there should use isTargetMingw() && !is64Bit() instead?
>
>
cc'ing graydon about segmented stacks because I know rust uses them.

-eric
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