Re: __atomic_test_and_set() and mips o32 - help wanted

Jason Thorpe <[email protected]> Wed, 19 Nov 2025 06:56:03 +0100

Newsgroups	gmane.os.netbsd.ports.alpha,gmane.os.netbsd.ports.mips.devel,gmane.os.netbsd.devel.toolchain
Message-ID	<[email protected]>

> On Nov 19, 2025, at 2:05 AM, Maciej W. Rozycki <[email protected]> wrote:
> 
> Conversely the compiler is happy to inline LL/SC sequences as they map 
> directly to RTL and at worst you need to maintain emulation.  It seems 
> like a good compromise.

I’m not disagreeing that inline ll/sc is more efficient on systems that support it.  But if the compiler is targeted at a MIPS-I target, this is generally considered an acceptable compromise.  Sure, if you build with -mmips3 or whatever the flag is, inline it.  But if -mmips1, a libcall doesn’t seem unreasonable.

-- thorpej