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From: "Andrew Fish" <afish@apple.com>
To: devel@edk2.groups.io, gzibrat@google.com
Subject: Re: [edk2-devel] Why is specified -mno-sse on clang x64?
Date: Thu, 04 Apr 2019 13:00:16 -0700	[thread overview]
Message-ID: <2A7A0205-FADC-4E8F-B744-E0B5C476A2C6@apple.com> (raw)
In-Reply-To: <CAHymY8+F8xQyiYurwWRK8+KNihQKL0KQ8pp=+_AA=b5wLAkRXQ@mail.gmail.com>

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Gary,

The edk2 is freestanding UEFI firmware and the runtime does not support floating point exceptions. 

I think a long time ago there was an optimization bug and the -mno-sse fixed it. 

The UEFI x64 ABI is Windows like and not Sys V like. 

Thanks,

Andrew Fish

> On Apr 4, 2019, at 10:13 AM, Gary Zibrat via Groups.Io <gzibrat=google.com@groups.io> wrote:
> 
> Does anyone know why -mno-sse is specified on Clang x64?
> https://github.com/tianocore/edk2/commit/6f756db5ea057ff10dd168c7627163cec046a3d9 <https://github.com/tianocore/edk2/commit/6f756db5ea057ff10dd168c7627163cec046a3d9>
> There doesn't seem to be a corresponding flag for other compilers.
> 
> I ask because a commit in LLVM breaks compilation of EDK2:
> https://reviews.llvm.org/rL357317#change-QSW9B7DqCGUI <https://reviews.llvm.org/rL357317#change-QSW9B7DqCGUI>
> 


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  reply	other threads:[~2019-04-04 20:00 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-04 17:13 Why is specified -mno-sse on clang x64? Gary Zibrat
2019-04-04 20:00 ` Andrew Fish [this message]
2019-04-04 20:09   ` [edk2-devel] " Gary Zibrat
2019-04-04 20:12     ` Andrew Fish
2019-04-08 21:12       ` Gary Zibrat

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