Hello,
On Sat, 5 Aug 2017 00:25:00 +0200, Ralf Baechle wrote:
> > Great! However, looking at the functions that end up calling __multi3,
> > I'm wondering why suddenly gcc 7.x needs to call such a function, while
> > the same code was compiling without __multi3 in libgcc with gcc 6.x.
>
> Chances are it's something specific to MIPS64 R6. Before trying your
> config file I also tried a number of other defconfigs and all built
> well.
>
> Here's a test case which generates a reference to __multi3:
>
> unsigned long func(unsigned long a, unsigned long b)
> {
> return a > (~0UL) / b;
> }
>
> GCC rearanges above statement to:
>
> return (unsigned __int128)a * (unsigned __int128) b > 0xffffffff;
And this is normal/expected ?
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
