[llvm] r261039 - [X86] Fix a shrink-wrapping miscompile around __chkstk

[Reid Kleckner via llvm-commits]

Let's do it.

On Wed, Feb 17, 2016 at 10:12 AM, Hans Wennborg <hans at chromium.org> wrote:

> Reid, what do you think about merging this to 3.8?
>
> On Tue, Feb 16, 2016 at 4:17 PM, Reid Kleckner via llvm-commits
> <llvm-commits at lists.llvm.org> wrote:
> > Author: rnk
> > Date: Tue Feb 16 18:17:33 2016
> > New Revision: 261039
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=261039&view=rev
> > Log:
> > [X86] Fix a shrink-wrapping miscompile around __chkstk
> >
> > __chkstk clobbers EAX. If EAX is live across the prologue, then we have
> > to take extra steps to save it. We already had code to do this if EAX
> > was a register parameter. This change adapts it to work when shrink
> > wrapping is used.
> >
> > Modified:
> >     llvm/trunk/lib/Target/X86/X86FrameLowering.cpp
> >     llvm/trunk/test/CodeGen/X86/shrink-wrap-chkstk.ll
>
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