linux-kernel - Re: Using __int128 on 64-bit architectures

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Message-ID: <20130421095120.GA6508@omega>
Date:	Sun, 21 Apr 2013 21:51:20 +1200
From:	Michael Cree <mcree@...on.net.nz>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Arch Mailing List <linux-arch@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Using __int128 on 64-bit architectures

On Sun, Apr 21, 2013 at 07:35:31PM +1000, Stephen Rothwell wrote:
> On Sun, 21 Apr 2013 05:29:28 +0100 (BST) "Maciej W. Rozycki" <macro@...ux-mips.org> wrote:
> >
> >  Hmm, nobody has replied, so just FYI such widening multiplication is 
> > available in all 64-bit MIPS hardware and GCC has supported it since 4.4 
> > or mid 2008 (older versions used a libgcc __multi3 helper, not quite so 
> > efficient as you can imagine).
> 
> i.e. for gcc 4.6.3, 64 bit powerpc calls out to __multi3
> 
> The same is true for sparc64.

Likewise, with gcc-4.6.3, alpha calls out to __multi3.

Cheers
Michael.
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