[LLVMbugs] [Bug 17631] llc inserts vzeroupper before a call and spoils avx registers, which lives across the call

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=17631

Michael Liao <michael.liao at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |michael.liao at intel.com
         Resolution|---                         |FIXED

--- Comment #1 from Michael Liao <michael.liao at intel.com> ---
It's turned out to be an issue specific to Windows where a special helper needs
inserting in function prologue. However, that helper is (and should be) simple,
has minimal registers clobbered and won't use/def XMM/YMM/ZMM registers. The
simple solution is to skip them during 'vzeroupper' insertion.

Fixed in r193261.

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