[cfe-commits] r154389 - in /cfe/trunk: lib/Driver/Tools.cpp test/Driver/linux-as.c

[James Molloy]

It still sounds like a pretty dirty hack to get something to work in the interim.

People will wonder why passing -mcpu only works for ARM and not for any other platform...

-----Original Message-----
From: cfe-commits-bounces at cs.uiuc.edu [mailto:cfe-commits-bounces at cs.uiuc.edu] On Behalf Of Hal Finkel
Sent: 23 April 2012 15:08
To: Evgeniy Stepanov
Cc: cfe-commits at cs.uiuc.edu
Subject: Re: [cfe-commits] r154389 - in /cfe/trunk: lib/Driver/Tools.cpp test/Driver/linux-as.c

LGTM, thanks!

 -Hal

On Mon, 23 Apr 2012 16:53:41 +0400
Evgeniy Stepanov <eugeni.stepanov at gmail.com> wrote:

> Ok, I moved this options under if(arm).
> Please take a look at the patch.
> 
> On Mon, Apr 23, 2012 at 4:35 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> > On Mon, 23 Apr 2012 07:14:19 -0500
> > Hal Finkel <hfinkel at anl.gov> wrote:
> >
> >> On Mon, 23 Apr 2012 11:14:04 +0400
> >> Evgeniy Stepanov <eugeni.stepanov at gmail.com> wrote:
> >>
> >> > On Sun, Apr 22, 2012 at 5:41 AM, Hal Finkel <hfinkel at anl.gov>
> >> > wrote:
> >> > > Evgeniy,
> >> > >
> >> > > Unfortunately, we need to be much more careful here. While gas
> >> > > for ARM does support -mcpu, -march and -mfpu, this is not true
> >> > > for other ISAs. Looking at the man page, it seems that the
> >> > > supported flags are:
> >> > >
> >> > > ARM: -mcpu=, -march=, -mfpu=
> >> > > i386: -march= (-mtune=: should we map -mcpu= to -mtune=?)
> >> > > MIPS: (same as i386)
> >> > > PowerPC: supports cpu, but as -m<cpu> (meaning
> >> > > -m403|-m405|-mppc64|...) SPARC: supports arch, but as -xarch=
> >> > >
> >> > > How do you think we should fix this?
> >> >
> >> > Well, we can make the set of forwarded options dependent on the
> >> > target.
> >>
> >> That makes sense.
> >>
> >> >
> >> > But what's the failing use case? I mean, why do you pass these
> >> > options to the compiler in the first place?
> >>
> >> This patch broke building on PPC with a non-default cpu type. I
> >> pass -mcpu=, as you do, to select appropriate cpu features and
> >> itineraries. The default clang behavior on PPC is to pass -many to
> >> the assembler. As you might imagine, this enables instructions for
> >> all known cpu types. With this patch, the assembler also gets the
> >> -mcpu=<cpu> flag provided to the driver. This is incorrect, it
> >> would need to be translated as -m<cpu> for PPC. I think it is
> >> unfortunate that gas cannot accept a common set of command-line
> >> parameters across platforms, but that I cannot fix ;)
> >
> > I should also add that it is quite possible for LLVM to have
> > itineraries for cpus that gas knows nothing about in particular.
> >
> >  -Hal
> >
> >>
> >> Thanks again,
> >> Hal
> >>
> >> >
> >> > >
> >> > >  -Hal
> >> > >
> >> > > On Tue, 10 Apr 2012 09:05:41 -0000
> >> > > Evgeniy Stepanov <eugeni.stepanov at gmail.com> wrote:
> >> > >
> >> > >> Author: eugenis
> >> > >> Date: Tue Apr 10 04:05:40 2012
> >> > >> New Revision: 154389
> >> > >>
> >> > >> URL: http://llvm.org/viewvc/llvm-project?rev=154389&view=rev
> >> > >> Log:
> >> > >> Pass -march, -mcpu, -mfpu to linuxtools assembler.
> >> > >>
> >> > >> Added:
> >> > >>     cfe/trunk/test/Driver/linux-as.c
> >> > >> Modified:
> >> > >>     cfe/trunk/lib/Driver/Tools.cpp
> >> > >>
> >> > >> Modified: cfe/trunk/lib/Driver/Tools.cpp
> >> > >> URL:
> >> > >> http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/Tools.cpp?rev=154389&r1=154388&r2=154389&view=diff
> >> > >> ==============================================================================
> >> > >> --- cfe/trunk/lib/Driver/Tools.cpp (original) +++
> >> > >> cfe/trunk/lib/Driver/Tools.cpp Tue Apr 10 04:05:40 2012 @@
> >> > >> -5089,6 +5089,10 @@ CmdArgs.push_back("-EL");
> >> > >>    }
> >> > >>
> >> > >> +  Args.AddLastArg(CmdArgs, options::OPT_march_EQ);
> >> > >> +  Args.AddLastArg(CmdArgs, options::OPT_mcpu_EQ);
> >> > >> +  Args.AddLastArg(CmdArgs, options::OPT_mfpu_EQ);
> >> > >> +
> >> > >>    Args.AddAllArgValues(CmdArgs, options::OPT_Wa_COMMA,
> >> > >>                         options::OPT_Xassembler);
> >> > >>
> >> > >>
> >> > >> Added: cfe/trunk/test/Driver/linux-as.c
> >> > >> URL:
> >> > >> http://llvm.org/viewvc/llvm-project/cfe/trunk/test/Driver/linux-as.c?rev=154389&view=auto
> >> > >> ==============================================================================
> >> > >> --- cfe/trunk/test/Driver/linux-as.c (added) +++
> >> > >> cfe/trunk/test/Driver/linux-as.c Tue Apr 10 04:05:40 2012 @@
> >> > >> -0,0 +1,31 @@ +// Check passing options to the assembler for
> >> > >> ARM targets. +//
> >> > >> +// RUN: %clang -target arm-linux -### \
> >> > >> +// RUN:   -no-integrated-as -c %s 2>&1 \
> >> > >> +// RUN:   | FileCheck -check-prefix=ARM %s
> >> > >> +// CHECK-ARM: as{{(.exe)?}}"
> >> > >> +//
> >> > >> +// RUN: %clang -target arm-linux -mcpu=cortex-a8 -### \
> >> > >> +// RUN:   -no-integrated-as -c %s 2>&1 \
> >> > >> +// RUN:   | FileCheck -check-prefix=ARM-MCPU %s
> >> > >> +// CHECK-ARM-MCPU: as{{(.exe)?}}" "-mcpu=cortex-a8"
> >> > >> +//
> >> > >> +// RUN: %clang -target arm-linux -mfpu=neon -### \
> >> > >> +// RUN:   -no-integrated-as -c %s 2>&1 \
> >> > >> +// RUN:   | FileCheck -check-prefix=ARM-MFPU %s
> >> > >> +// CHECK-ARM-MFPU: as{{(.exe)?}}" "-mfpu=neon"
> >> > >> +//
> >> > >> +// RUN: %clang -target arm-linux -march=armv7-a -### \
> >> > >> +// RUN:   -no-integrated-as -c %s 2>&1 \
> >> > >> +// RUN:   | FileCheck -check-prefix=ARM-MARCH %s
> >> > >> +// CHECK-ARM-MARCH: as{{(.exe)?}}" "-march=armv7-a"
> >> > >> +//
> >> > >> +// RUN: %clang -target arm-linux -mcpu=cortex-a8 -mfpu=neon
> >> > >> -march=armv7-a -### \ +// RUN:   -no-integrated-as -c %s 2>&1
> >> > >> \ +// RUN:   | FileCheck -check-prefix=ARM-ALL %s
> >> > >> +// CHECK-ARM-ALL: as{{(.exe)?}}" "-march=armv7-a"
> >> > >> "-mcpu=cortex-a8" "-mfpu=neon" +//
> >> > >> +// RUN: %clang -target armv7-linux -mcpu=cortex-a8 -### \
> >> > >> +// RUN:   -no-integrated-as -c %s 2>&1 \
> >> > >> +// RUN:   | FileCheck -check-prefix=ARM-TARGET %s
> >> > >> +// CHECK-ARM-TARGET: as{{(.exe)?}}" "-mfpu=neon"
> >> > >> "-mcpu=cortex-a8"
> >> > >>
> >> > >>
> >> > >> _______________________________________________
> >> > >> cfe-commits mailing list
> >> > >> cfe-commits at cs.uiuc.edu
> >> > >> http://lists.cs.uiuc.edu/mailman/listinfo/cfe-commits
> >> > >
> >> > >
> >> > >
> >> > > --
> >> > > Hal Finkel
> >> > > Postdoctoral Appointee
> >> > > Leadership Computing Facility
> >> > > Argonne National Laboratory
> >>
> >>
> >>
> >
> >
> >
> > --
> > Hal Finkel
> > Postdoctoral Appointee
> > Leadership Computing Facility
> > Argonne National Laboratory



-- 
Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory

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