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Re: PATCH: Fix ll/sc for mips (take 3)
On Fri, Feb 01, 2002 at 06:01:26PM -0500, Daniel Jacobowitz wrote:
> On Fri, Feb 01, 2002 at 10:29:43AM -0800, H . J . Lu wrote:
> > On Fri, Feb 01, 2002 at 12:45:02PM +0100, Maciej W. Rozycki wrote:
> > > On Thu, 31 Jan 2002, H . J . Lu wrote:
> > >
> > > > > Gas will fill delay slots. Same object codes will be produced, so I
> > > > > think you don't have to do that by hand.
> > > >
> > > > It will make the code more readable. We don't have to guess what
> > > > the assembler will do.
> > >
> > > But you lose a chance for something useful being reordered to the slot.
> > > That might not necessarily be a "nop". Please don't forget of indents
> > > anyway.
> > >
> > Here is a new patch. I use branch likely to get rid of nops. Please
> > tell me which indents I may have missed.
> Can you really assume presence of the branch-likely instruction? I
> don't think so.
Why not? Can you show me a MIPS II or above CPU which doesn't have
branch-likely instruction? From gcc,
/* ISA has branch likely instructions (eg. mips2). */
/* Disable branchlikely for tx39 until compare rewrite. They haven't
been generated up to this point. */
#define ISA_HAS_BRANCHLIKELY (mips_isa != 1 \
/* || TARGET_MIPS3900 */)
Did I miss something?