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Re: [PATCH] A new meta intrinsic header file for current and future x86 instrinsics.
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: "rajagopal, dwarak" <dwarak dot rajagopal at amd dot com>
- Cc: "Uros Bizjak" <ubizjak at gmail dot com>, "Guo, Xuepeng" <xuepeng dot guo at intel dot com>, gcc-patches at gcc dot gnu dot org, jakub at redhat dot com, "Lu, Hongjiu" <hongjiu dot lu at intel dot com>, "Ye, Joey" <joey dot ye at intel dot com>, "Lin, Weiliang" <weiliang dot lin at intel dot com>, "Harle, Christophe" <christophe dot harle at amd dot com>, "Sebastian Pop" <sebpop at gmail dot com>
- Date: Wed, 19 Nov 2008 12:43:26 -0800
- Subject: Re: [PATCH] A new meta intrinsic header file for current and future x86 instrinsics.
- References: <820531547ADB6847AF89CC220F6128F1737F@pdsmsx001.ccr.corp.intel.com> <4923023C.firstname.lastname@example.org> <9E1304B144EBEB4C97F4162BFAC4788602D3A6CD@SAUSEXMB2.amd.com>
On Wed, Nov 19, 2008 at 12:30 PM, rajagopal, dwarak
>> If there are no further comments or objections from AMD people in the
>> next 48 hours, and since this header file is intended for _Intel_
>> intrinsics, it is OK for mainline.
>> BTW: I guess there will be a header file (ammintrin.h ?) introduced to
>> include AMD defined intrinsics, so gcc can still add x86intrin.h that
>> will include both immintrin.h and eventual ammintrin.h. Hopefully,
>> two intrinsics won't step onto each other toes.
>> I hope this eventual solution is acceptable to both contributors.
> This proposal is not acceptable to AMD for the following reasons:
> - GCC is an open source compiler that is vendor agnostic. We do not want
> to see vendor specific intrinsic files, as the ISAs are architecture
> specific primarily. This is how it has been till now (eg: emmintrin.h,
> xmmintrin.h, etc). Also there are many examples when AMD adopted SSE
> instructions after Intel created them, and Intel adopted AMD
> instructions after AMD came up with them (latest example: popcnt).
> - We recommend that there is only 1 intrinsic file used for all x86
> intrinsics. This seemed to have been agreed upon
> (http://gcc.gnu.org/ml/gcc/2008-04/msg00081.html). We prefer that this
> file be neutral and vendor agnostic,
There is no disagreement here.
> which immintrin.h is not.
immintrin.h is orthogonal to single intrinsic file for all x86 intrinsics.
We just renamed the existing gmmintrin.h to immintrin.h to follow icc.