[PATCH] Fix PR17631

[Michael Liao]

Kingly ping.

- Michael

On Tue, 2013-10-22 at 11:45 -0700, Michael Liao wrote:
> Hi,
> 
> PR17631 is caused by the vzeroupper pass will insert 'vzeroupper' before
> calls when necessary. However, some helper calls will be inserted in
> specific targets during prolog insertion (Windows needs to call _chkstk
> in case that there're more that 4KB allocated on stack.) As these
> function calls won't preserve XMM/YMM registers as regular calls, that
> 'vzeroupper' inserted will clobber all upper parts of YMM registers. The
> attached patch fixes that by skipping func-calls added in prolog. This
> assumes that prolog helper functions (_chkstk for MSVC and _alloca for
> MINGW/CYGWIN) should have minimal registers clobbered and won't def/use
> XMM/YMM registers.
> 
> Thanks for review
> - Michael
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