Re: PATCH: Support MIPS II

["H . J . Lu" <hjl at lucon dot org>]

On Wed, May 08, 2002 at 11:20:23AM -0500, Benjamin Kosnik wrote:
> 
> one file:
> > #ifndef _BITS_ATOMICITY_H
> >
> > #ifdef _MIPS_ISA
> >
> > #include <sgidefs.h>
> 
> second file:
> > #if _MIPS_ISA >= _MIPS_ISA_MIPS2
> >
> > #define _BITS_ATOMICITY_H 1
> >
> > asm for MIPS 2.
> >
> > #endif /* _MIPS_ISA >= _MIPS_ISA_MIPS2 */
> >
> > #endif /* !_MIPS_ISA */
> >
> 
> generic file:
> > #ifndef _BITS_ATOMICITY_H
> >
> > #define _BITS_ATOMICITY_H 1
> >
> > generic version
> >
> > #endif
> >

What are those? The content of atomicity.h is decided at the gcc runtime
for mips. What are those files for? How are they used at the gcc runtime?

> 
> see how i386/i486 are done.
> 

I don't follow you. Can you tell me why there is i486/bits/atomicity.h? On 
gcc 3.1 branch:

diff -upr i486/bits/atomicity.h i386/bits/atomicity.h
--- i486/bits/atomicity.h       Fri Oct  5 20:46:34 2001
+++ i386/bits/atomicity.h       Tue Feb 27 16:14:15 2001
@@ -1,4 +1,4 @@
-// Low-level functions for atomic operations: x86, x >= 4 version  -*- C++ -*-
+// Low-level functions for atomic operations: x86, x < 4 version  -*- C++ -*-
 
 // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
 //
@@ -55,3 +55,5 @@ __atomic_add (volatile _Atomic_word* __m
 #endif /* atomicity.h */
 
 
+
+

Besides, you can't compare x86 with MIPS. There is no _X86_ISA for x86 and
there are no mips[1|2|...]-*-* configurations.


H.J.