[gnutls-devel] GnuTLS | x86/avx: fix avx detection (!1334)

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Tue Sep 22 07:42:01 CEST 2020

zzjianhui created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1334

Project:Branches: zzjianhui/gnutls:fix-avx-detection to gnutls/gnutls:master
Author:    zzjianhui

In the case of setting environment variables, AVX cannot be detected correctly. Because only MOVBE is added to variable _gnutls_x86_cpuid_s, there is no OSXSAVE. And according to the intel manual, using AVX does not need to detect FMA.

fixes #1083 

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)
 * [x] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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