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Re: option for default 64-bit integers on Opteron and itanium
- From: Paul Brook <paul at nowt dot org>
- To: Jiri Pittner <jiri dot pittner at jh-inst dot cas dot cz>, fortran at gcc dot gnu dot org,gcc at gcc dot gnu dot org
- Date: Tue, 2 Dec 2003 14:01:29 +0000
- Subject: Re: option for default 64-bit integers on Opteron and itanium
- References: <200312021336.hB2DabVv016663@jp.jh-inst.cas.cz>
On Tuesday 02 December 2003 1:36 pm, Jiri Pittner wrote:
> Commercial compilers (Intel, Portland group) offer such option called
> usually -i8, and similar one -r8 which makes real*4 -> real*8.
gfortran does supports both these, except the commandline swith to enable it
seems to be broken. The corresponding 128-bit double precision types are
only partially implemented, although adding the required intrinsics is a
fairly straighforward task.
Your desctiption of the effect of -r8 is slightly innaccuate. It changes the
default real kind to 8. real*4 and real(kind=4) are still 32-bit types.
Paul