[cfe-dev] Will clang 4.0 support the new LLVM Exception Handleing instructions ?

[David Majnemer via cfe-dev]

On Tue, Sep 6, 2016 at 10:00 PM, <bluedream_zqs at sina.com> wrote:

> Does it mean, LLVM supports the new eh instructions early before and clang
> use it to implement the MSVC exception handling. What 4.0 did is just
> export those instructions into the documentation. And we won't change the
> clang eh implementation in fact, still use the landingpad inst for all
> platform ?
>

We don't use LandingPadInst for all platforms, we use it on all non-MSVC
compatible platforms.  MSVC compatible EH uses the new mechanism.


>
> ----- 原始邮件 -----
> 发件人：David Majnemer <david.majnemer at gmail.com>
> 收件人：bluedream_zqs at sina.com
> 抄送人：cfe-dev <cfe-dev at lists.llvm.org>
> 主题：Re: Re: [cfe-dev] Will clang 4.0 support the new LLVM Exception
> Handleing instructions ?
> 日期：2016年09月07日 12点47分
>
>
>
> On Tue, Sep 6, 2016 at 9:37 PM, <bluedream_zqs at sina.com> wrote:
>
>
> ----- 原始邮件 -----
> 发件人：David Majnemer <david.majnemer at gmail.com>
> 收件人：bluedream_zqs at sina.com
> 抄送人：cfe-dev <cfe-dev at lists.llvm.org>
> 主题：Re: [cfe-dev] Will clang 4.0 support the new LLVM Exception Handleing
> instructions ?
> 日期：2016年09月07日 12点29分
>
> Do we have any plan to make the new eh instructions as the default
> implementation for all platforms ?
>
>
> No, that would result in a performance regression for non-MSVC exception
> handling.
>
>
>
>
> On Tue, Sep 6, 2016 at 6:49 PM, via cfe-dev <cfe-dev at lists.llvm.org>
> wrote:
>
>  LLVM support new eh instructions.(http://llvm.org/
> docs/ExceptionHandling.html#new-exception-handling-instructions) Clang
> still use the old landingpad inst to support the C++ exceptions. Do we have
> any plan to enable the support of the new exception instructions ?
>
>
> Clang already supports the new C++ exception handling instructions, it
> uses them exclusively to implement MSVC compatible exception handling.  The
> landingpad scheme is retained because it provides a degree of flexibility
> (and thus optimization opportunities) which isn't available in the new
> instructions.
>
>
>
> Thank you.
>
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>
>
>
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