[PATCH] X86: VZeroUpperInserter: shortcut should not trigger if we have any function live-ins.

[Matthias Braun]

Thanks for the review. The testcase (CodeGen/X86/vec_extract-avx.ll) that made me create this patch is already in the repository and will break if subreg liveness is enabled for X86.

Greetings
    Matthias

> On Jan 7, 2015, at 4:18 PM, Lang Hames <lhames at gmail.com> wrote:
> 
> LGTM. Do you have a test case for this?
> 
> - Lang.
> 
> On Tue, Dec 23, 2014 at 5:58 PM, Matthias Braun <matze at braunis.de <mailto:matze at braunis.de>> wrote:
> The later code adds a vzeroupper if a ymm register is live-in to the function, so the shortcut should needs to check for that as well before deciding to bail out early.
> 
> Greetings
>     Matthias
> 
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