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Re: Desire to allocate bit in DT_PARM bitmask for DEC FORMAT compatibility purposes
- From: Jeff Law <law at redhat dot com>
- To: Jakub Jelinek <jakub at redhat dot com>
- Cc: fortran at gcc dot gnu dot org, gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Wed, 21 Mar 2018 11:29:36 -0600
- Subject: Re: Desire to allocate bit in DT_PARM bitmask for DEC FORMAT compatibility purposes
- References: <05ca4109-b7bc-ac98-439e-bb62f1796fe8@redhat.com> <20180321172534.GL8577@tucnak>
On 03/21/2018 11:25 AM, Jakub Jelinek wrote:
> On Tue, Mar 20, 2018 at 12:41:25PM -0600, Jeff Law wrote:
>> This is documented in the old manuals from DEC and I've found
>> essentially the same documentation in Oracle/Sun's current documentation
>> as well as old MIPS documentation. I have a high degree of confidence
>> it exists in IBM's Fortran compilers as well. In contrast Intel & PCG's
>> Fortran compilers do not seem to support this extension.
>
> My testing disagrees with the last one, at least ifort 17.0.4 handles
> the default widths like this patch does with -fdec.
I was going from what I could find in the online documentation. I could
have missed it, or it could be undocumented behavior. Similarly for
Portland Group's compiler -- I'm going on documented behavior that I
could find online.
I don't think it materially changes things though.
jeff