Date: Mon, 15 Jun 2015 10:08:12 -0600 From: Warner Losh <imp@bsdimp.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: <47D07C4F-1AF3-4AD7-BFAA-76B0FD8BFFC4@bsdimp.com> In-Reply-To: <CAJ-Vmonsmu5dGtWKhJchzZfSsVUjtwEVSEij4u6kwk64E0ZOXw@mail.gmail.com> References: <CAJ-Vmonsmu5dGtWKhJchzZfSsVUjtwEVSEij4u6kwk64E0ZOXw@mail.gmail.com>
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> On Jun 13, 2015, at 4:41 PM, Adrian Chadd <adrian@freebsd.org> wrote:
>=20
> Hi,
>=20
> our libgcc in -base is very .. old. It chokes when compiling for
> mips32. This patch seems to do the right thing.
>=20
> Does anyone have any positive/negative feedback?
What code does it generate?
Something doesn=E2=80=99t look quite right, but I can=E2=80=99t quite =
put my finger on it.
Warner
> Thanks,
>=20
>=20
> -adrian
>=20
>=20
> Index: contrib/gcc/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
> --- contrib/gcc/longlong.h (revision 284090)
> +++ contrib/gcc/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 __ll =3D (UDItype)(u) * (v); =
\
> + w1 =3D __ll >> 32; =
\
> + w0 =3D __ll; =
\
> + } while (0)
> #define UMUL_TIME 10
> #define UDIV_TIME 100
> #endif /* __mips__ */
> _______________________________________________
> freebsd-mips@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-mips
> To unsubscribe, send any mail to =
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