This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Is it a bug allowing to copy GIMPLE_ASM with labels?
- From: "Bin.Cheng" <amker dot cheng at gmail dot com>
- To: amonakov at ispras dot ru
- Cc: GCC Development <gcc at gcc dot gnu dot org>
- Date: Sat, 29 Dec 2018 15:52:21 +0800
- Subject: Re: Is it a bug allowing to copy GIMPLE_ASM with labels?
- References: <CAHFci29NA3-eZ3GN+O=hYFNEjbFt4==VAhnuBPJqLY_x+re0WA@mail.gmail.com> <alpine.LNX.2.20.13.1812291038290.25673@monopod.intra.ispras.ru>
On Sat, Dec 29, 2018 at 3:42 PM Alexander Monakov <amonakov@ispras.ru> wrote:
>
> On Sat, 29 Dec 2018, Bin.Cheng wrote:
> > tracer-1.c: Assembler messages:
> > tracer-1.c:16: Error: symbol `foo_label' is already defined
> >
> > Root cause is in tracer.c which duplicates basic block without
> > checking if any GIMPLE_ASM defines labels.
> > Is this a bug or invalid code?
>
> This is invalid code, GCC documentation is clear that the compiler
> may duplicate inline asm statements (passes other than tracer can do
> that too, loop unswitching just to give one example).
>
> We don't provide a way to write an asm that wouldn't be duplicated.
I see, thanks for elaboration.
Thanks,
bin
>
> Alexander