Date: Wed, 17 Jun 2015 23:59:34 -0400 From: Alexander Kabaev <kabaev@gmail.com> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org> Subject: Re: [rfc] fix umul_ppmm() in our libgcc Message-ID: <20150617235934.3d2c4c95@kan> In-Reply-To: <CAJ-Vmoncx=Qr_FY7qEPxK0j12_pGREG05qrk65QLk01Arf4RmQ@mail.gmail.com> References: <CAJ-Vmonsmu5dGtWKhJchzZfSsVUjtwEVSEij4u6kwk64E0ZOXw@mail.gmail.com> <20150616011832.146e0f0e@kan> <CAJ-Vmokm1anJUaZLEFpW=JpV5nec7CTuL1yPOJdZniQ53%2BArcQ@mail.gmail.com> <CAJ-Vmoncx=Qr_FY7qEPxK0j12_pGREG05qrk65QLk01Arf4RmQ@mail.gmail.com>
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On Wed, 17 Jun 2015 19:57:35 -0700
Adrian Chadd <adrian@freebsd.org> wrote:
> Ok, so this:
>=20
> adrian@lucy-11i386:~/work/freebsd/head-embedded-2/src/contrib/gcc %
> svn diff longlong.h
> Index: longlong.h
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> --- longlong.h (revision 284394)
> +++ longlong.h (working copy)
> @@ -584,11 +584,11 @@
>=20
> #if defined (__mips__) && W_TYPE_SIZE =3D=3D 32
> #define umul_ppmm(w1, w0, u, v) \
> - __asm__ ("multu %2,%3" \
> - : "=3Dl" ((USItype) (w0)), \
> - "=3Dh" ((USItype) (w1)) \
> - : "d" ((USItype) (u)), \
> - "d" ((USItype) (v)))
> + do { \
> + UDItype __x =3D (UDItype) (USItype) (u) * (USItype) (v); \
> + w1 =3D __x >> 32; \
> + w0 =3D __x; \
> + } while (0)
> #define UMUL_TIME 10
> #define UDIV_TIME 100
> #endif /* __mips__ */
>=20
>=20
> ?
>=20
>=20
>=20
> -a
Looks good to me.
--=20
Alexander Kabaev
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