This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
Re: [Patch] MIPS: mips16e machine patterns - zeb/zeh seb/seh
On Fri, Jun 10, 2005 at 10:43:30AM -0700, Eric Christopher wrote:
>
> > That's because to be MIPS32/32R2/64/64R2 ASE compliant, the full MIPS16e
> > set is required, not a subset (MIPS16). I've simply made that if the
> > user gave -mips16 option for mips_isa>=32, they really mean -mips16e.
> > As in Ian's previous reply, -march=mips32 -mips16 will imply -mips16e.
>
> Gah. No.
>
> The compiler should not "infer" or "guess" what the user meant. Richard
> and I spent a lot of time removing that kind of code from the compiler,
> I don't want to put more in there.
>
> If they say -mips16 they get -mips16. If they say -mips16e they get -
> mips16e.
This I don't get. Why not think of it this way (which I thought was
what Richard was suggesting):
A MIPS processor with MIPS16 support has two modes, 16-bit and 32-bit
instructions.
When you say -mips16 you get all of the instructions in the selected
processor's 16-bit mode. If -march implies a processor which
supports MIPS16e, then enable MIPS16e.
--
Daniel Jacobowitz
CodeSourcery, LLC