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Re: RFC & patch: Rework MIPS command-line handling

On Mon, 15 Jul 2002, Thiemo Seufer wrote:

> Note that the MIPS II is a deviation from stock o32 ABI, the
> linux-mips kernel emulates the necessary instructions on MIPS I
> hardware. This means we have an o32-linux ABI there.

 Does it?  I haven't seen any code to emulate trap, branch likely, dword
coprocessor transfer instructions.  What is emulated are only the ll and
sc instructions, but they are only a small subset of MIPS II extensions
which is never used by gcc, unlike the others.

> > If they're using mipsisa64sb1-linux, they probably expect built-in
> > support for, say, MIPS-3D, MDMX .ob, and the few SB-1 extensions as
> > well, regardless of the ABI they choose on the command line.
> If all of the hardware for this target supports these, ok.
> But the ISA pre-selection should then be done in the target specific
> code and not globally.

 If a target triplet defines a CPU, it should always be used as the
default for uniformity.

+  Maciej W. Rozycki, Technical University of Gdansk, Poland   +
+        e-mail:, PGP key available        +

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