This is the mail archive of the
gcc-help@gcc.gnu.org
mailing list for the GCC project.
RE: builtin assembler constraints
This is really strange that such option does not exist. VLE instruction set does not use r8-r24 for many 16bit instructions. How do people use inline assembly with these? Or does compiler recognize these limitations for "known" instructions by itself?
Alex.
-----Original Message-----
From: Ian Lance Taylor [mailto:iant@google.com]
Sent: Friday, February 08, 2013 3:19 PM
To: Grobman Alexander-R53196
Cc: gcc-help@gcc.gnu.org
Subject: Re: builtin assembler constraints
On Fri, Feb 8, 2013 at 10:15 AM, Grobman Alexander-R53196 <R53196@freescale.com> wrote:
>
> I'm trying to incorporate new PPC instructions into a C code. These
> instructions use limited set of GPRs as operands i.e. only even
> registers can be used as a source,
>
> Is there way to specify that in the asm() statement?
As far as I know there is no constraint that describes only the even registers of the general register set. It would not be very difficult to add one to the PPC backend. I can't think of any other way to approach this.
Ian