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[patch #8730] Fixes for AX_EXT / AX_GCC_X86_AVX_XGETBV / AX_GCC_X86_CPUI

From: Michael Petch
Subject: [patch #8730] Fixes for AX_EXT / AX_GCC_X86_AVX_XGETBV / AX_GCC_X86_CPUID
Date: Thu, 27 Aug 2015 00:50:42 +0000
User-agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36


                 Summary: Fixes for AX_EXT / AX_GCC_X86_AVX_XGETBV /
                 Project: GNU Autoconf Archive
            Submitted by: mdpetch
            Submitted on: Wed 26 Aug 2015 18:50:41 MDT
                Priority: 7 - High
                  Status: None
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any



An issue was discovered when CPUID was 0x07. the returned values
(eax,ebx,ecx,edx) always returned 0 even on newer processors. Some of the
CPUID categories (including 0x07) now require ECX to be set with a count value
prior to executing CPUID.

Resolved this (and other cleanup) by adding a new function
AX_GCC_X86_CPUID_COUNT(OP, COUNT); modify AX_EXT to call this new function;
and explicitly set ECX to 0 when someone calls AX_GCC_X86_CPUID; make sure
that all the __asm__ instructions include __volatile__ to be on the safe

The included patch can be applied to the latest versions in git.


File Attachments:

Date: Wed 26 Aug 2015 18:50:41 MDT  Name: ax_ext_related_fixes.patch  Size:
5kB   By: mdpetch
Patch to resolve a CPUID category of 0x07 + cleanup


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