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From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Thu, 13 Jul 2017 17:17:55 +0100
Message-ID: <CAKv+Gu9HA1JFY+3Pn5SbjjpMQg7FytbL06oO3sG7pO1VpsNUZw@mail.gmail.com>
To: Alexei Fedorov <Alexei.Fedorov@arm.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>, 
 "edk2-devel@lists.01.org" <edk2-devel@lists.01.org>,
 "liming.gao@intel.com" <liming.gao@intel.com>, 
 "yonghong.zhu@intel.com" <yonghong.zhu@intel.com>,
 Evan Lloyd <Evan.Lloyd@arm.com>
Subject: Re: [PATCH 2/2] BaseTools/tools_def AARCH64: avoid SIMD register in XIP code
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On 13 July 2017 at 17:15, Alexei Fedorov <Alexei.Fedorov@arm.com> wrote:
> Hi,
>
> I've tried the patch & it turns out that options provided with
>
> DEFINE GCC_AARCH64_CC_XIPFLAGS     = -mstrict-align -mgeneral-regs-only
>
> aren't picked when building library code with SIMD load/store instructions
> still being generated.
>
> Please see the attached assembly generated file for
> edk2\MdePkg\Library\UefiLib\UefiLibPrint.c.
>

What is wrong with SIMD registers being used in UefiLibPrint? The
report was about code that runs with the MMU off, right?