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Message-ID: <20200619224624.GO6430@brightrain.aerifal.cx>
Date: Fri, 19 Jun 2020 18:46:24 -0400
From: Rich Felker <dalias@...c.org>
To: sidneym@...eaurora.org
Cc: 'Szabolcs Nagy' <nsz@...t70.net>, musl@...ts.openwall.com
Subject: Re: Hexagon DSP support
On Fri, Jun 19, 2020 at 04:58:53PM -0500, sidneym@...eaurora.org wrote:
>
> > -----Original Message-----
> > From: Szabolcs Nagy <nsz@...t70.net>
> > Sent: Thursday, June 18, 2020 4:43 PM
> > To: sidneym@...eaurora.org
> > Cc: musl@...ts.openwall.com
> > Subject: Re: [musl] Hexagon DSP support
> >
> > * sidneym@...eaurora.org <sidneym@...eaurora.org> [2020-06-18 11:37:05
> > -0500]:
> > > I attached the updated REPORT with warning output disabled, -w and
> > > -fno-rounding-math (See https://bugs.llvm.org/show_bug.cgi?id=45329)
> > > along with the patch. I've rebased a couple of times without any
> > > conflicts and the git repo is here:
> > > https://github.com/quic/musl/tree/hexagon
> >
> > the fmal failures are a bit concerning:
> >
> > fmal should be a tail call to fma if long double has the same
> representation as
> > double. (can you please verify this? there should be a single branch
> instruction
> > in fmal)
> >
> > there are no fma failures with the same tests so fmal should work fine
> too.
>
> In the case of fma the selected function comes from compiler-rt-builtins.
> It looks like since fmal calls fma within the context of the c-library the
> c-library's version is branched to.
Are you talking about how libc-test was built or how musl was built?
This kind of replacement is not valid in either place. musl is built
with -ffreestanding, and libc-test is expected to be built with
-fno-builtin.
Rich
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