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On Thu, Sep 19, 2013 at 11:53 AM, Gao, Yunzhong < yunzhong_gao at playstation.sony.com> wrote: > Hi all, > > I would like to make a proposal about changing the optimization strategy > regarding when to insert a vzeroupper instruction in the x86 backend. > > Current implementation: > vzeroupper is inserted to any functions that use AVX instructions. The > insertion

...ary codes; sorry). > If you want a mechanism to disable vzeroupper generation for particular > function calls, that might make sense... > -Eli -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20130920/1a8d64aa/attachment.html>

Hi all, I would like to make a proposal about changing the optimization strategy regarding when to insert a vzeroupper instruction in the x86 backend. Current implementation: vzeroupper is inserted to any functions that use AVX instructions. The insertion points are: 1) before a call instruction; 2) before a return instruction; Rationale: vzeroupper is an AVX instruction; it is inserted to