From cd94326a1326c4e3f1ee7a8d0a161cc0bdcaf07e Mon Sep 17 00:00:00 2001 From: Joe Ramsay Date: Wed, 12 Apr 2023 14:37:49 +0100 Subject: Enable libmvec support for AArch64 This patch enables libmvec on AArch64. The proposed change is mainly implementing build infrastructure to add the new routines to ABI, tests and benchmarks. I have demonstrated how this all fits together by adding implementations for vector cos, in both single and double precision, targeting both Advanced SIMD and SVE. The implementations of the routines themselves are just loops over the scalar routine from libm for now, as we are more concerned with getting the plumbing right at this point. We plan to contribute vector routines from the Arm Optimized Routines repo that are compliant with requirements described in the libmvec wiki. Building libmvec requires minimum GCC 10 for SVE ACLE. To avoid raising the minimum GCC by such a big jump, we allow users to disable libmvec if their compiler is too old. Note that at this point users have to manually call the vector math functions. This seems to be acceptable to some downstream users. Reviewed-by: Szabolcs Nagy --- NEWS | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'NEWS') diff --git a/NEWS b/NEWS index 054d81fc81..a52c17c677 100644 --- a/NEWS +++ b/NEWS @@ -29,6 +29,12 @@ Major new features: - x86_64-gnu +* Added libmvec vector math library support to AArch64. It requires + GCC version >= 10.1.0. It can be disabled via --disable-mathvec, + however that is not a supported configuration as it changes the ABI. + The symbol names follow the AArch64 vector ABI, they are declared + in math.h and have to be called manually at this point. + Deprecated and removed features, and other changes affecting compatibility: * In the Linux kernel for the hppa/parisc architecture some of the -- cgit 1.4.1