[Bug 38470] __chkstk not implemented on ARM

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=38470

--- Comment #15 from André H. <nerv at dawncrow.de> ---
(In reply to MY123 from comment #14)
> There is a separate issue with LLVM -mcode-model=large because that also
> uses r12 for __chkstk calls, but that bug is not triggered by MSVC or the
> normal LLVM  code model.

No, no problem. AJ optimized your code, and it doesn't use r12/ip anymore:
https://source.winehq.org/git/wine.git/commitdiff/2b095beace7b457586bd33b3b1c81df116215193

With you original version there wouldn't have been an issue either, you
modified r12 in the function, llvm modifies r12 to call the function and can't
expect it to be unchanged afterwards as it's a scratch register

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