From: Christophe LYON <christophe.lyon@foss.st.com>
To: gcc Patches <gcc-patches@gcc.gnu.org>
Subject: Re: [PATCH] arm: Fix multilib mapping for CDE extensions [PR100856]
Date: Mon, 16 Aug 2021 13:51:46 +0200 [thread overview]
Message-ID: <ea7bc912-7722-6e81-ba7e-6b30af3ed975@foss.st.com> (raw)
In-Reply-To: <CAKhMtSKzTVX-Lb2jPZWHpNAizmYf24XtdWuhxOdxdh-S2+PdWw@mail.gmail.com>
ping?
On 11/08/2021 16:06, Christophe Lyon wrote:
> ping?
> https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575310.html
> <https://gcc.gnu.org/pipermail/gcc-patches/2021-July/575310.html>
>
>
> On Wed, Aug 4, 2021 at 11:13 AM Christophe Lyon via Gcc-patches
> <gcc-patches@gcc.gnu.org <mailto:gcc-patches@gcc.gnu.org>> wrote:
>
> ping?
>
> On Thu, 15 Jul 2021 at 15:07, Christophe LYON via Gcc-patches
> <gcc-patches@gcc.gnu.org <mailto:gcc-patches@gcc.gnu.org>> wrote:
> >
> > This is a followup to Srinath's recent patch: the newly added
> test is
> > failing e.g. on arm-linux-gnueabihf without R/M profile multilibs.
> >
> > It is also failing on arm-eabi with R/M profile multilibs if the
> > execution engine does not support v8.1-M instructions.
> >
> > The patch avoids this by adding check_effective_target_FUNC_multilib
> > in target-supports.exp which effectively checks whether the target
> > supports linking and execution, like what is already done for other
> > ARM effective targets. pr100856.c is updated to use it instead of
> > arm_v8_1m_main_cde_mve_ok (which makes the testcase a bit of a
> > duplicate with check_effective_target_FUNC_multilib).
> >
> > In addition, I noticed that requiring MVE does not seem
> necessary and
> > this enables the test to pass even when targeting a CPU without MVE:
> > since the test does not involve actual CDE instructions, it can pass
> > on other architecture versions. For instance, when requiring
> MVE, we
> > have to use cortex-m55 under QEMU for the test to pass because the
> > memset() that comes from v8.1-m.main+mve multilib uses LOB
> > instructions (DLS) (memset is used during startup). Keeping
> > arm_v8_1m_main_cde_mve_ok would mean we would enable the test
> provided
> > we have the right multilibs, causing a runtime error if the
> simulator
> > does not support LOB instructions (e.g. when targeting cortex-m7).
> >
> > I do not update sourcebuild.texi since the CDE effective targets are
> > already collectively documented.
> >
> > Finally, the patch fixes two typos in comments.
> >
> > 2021-07-15 Christophe Lyon <christophe.lyon@foss.st.com
> <mailto:christophe.lyon@foss.st.com>>
> >
> > PR target/100856
> > gcc/
> > * config/arm/arm.opt: Fix typo.
> > * config/arm/t-rmprofile: Fix typo.
> >
> > gcc/testsuite/
> > * gcc.target/arm/acle/pr100856.c: Use
> arm_v8m_main_cde_multilib
> > and arm_v8m_main_cde.
> > * lib/target-supports.exp: Add
> > check_effective_target_FUNC_multilib for ARM CDE.
> >
> >
>
next prev parent reply other threads:[~2021-08-16 11:51 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-15 13:04 Christophe LYON
2021-08-04 9:11 ` Christophe Lyon
2021-08-11 14:06 ` Christophe Lyon
2021-08-16 11:51 ` Christophe LYON [this message]
2021-08-23 8:58 ` Christophe LYON
2021-08-23 9:03 ` Kyrylo Tkachov
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