(j3.2006) paper 17-242r1 - locality

[Malcolm Cohen]

I think that adding those words makes no real difference.  It?s the plain meaning of the constraint already.

It would not hurt to add them though, and would slightly reduce misreading possibilities.  I?ve made a note to myself to that effect for when I?m doing that paper.  (Not soon.)

Cheers,

From: Bill Long 
Sent: Saturday, October 28, 2017 8:07 AM
To: fortran standards email list for J3 
Subject: (j3.2006) paper 17-242r1 - locality

In paper 17-242r1 we changed C1129 to read

C1129 If the locality-spec DEFAULT ( NONE ) appears in a DO CONCURRENT
statement, a variable that is a local or construct entity of a scope
containing the DO CONCURRENT construct, and that appears in the block
of the construct, shall have its locality explicitly specified.


How about an (admittedly pathological) example

subroutine sub
integer x(1)
do concurrent (i=1:1) default(none) shared(x)
x(i) = 0
do concurrent (j = 1:1) default (none)
x(j) = 1
end do
end do
print *, x
end subroutine sub

Question: Is a locality spec, such as "shared(x)?, required on the second do concurrent statement? The code above appears to satisfy the requirements of the constraint - the locality of X is explicitly specified (on the outer do concurrent). Or did we intend to say ??shall have it locality explicitly specified ON THAT DO CONCURRENT STATEMENT.?? [CAPS to emphasize added text.] 


Cheers,
Bill

Bill Long longb at cray.com
Principal Engineer, Fortran Technical Support & voice: 651-605-9024
Bioinformatics Software Development fax: 651-605-9143
Cray Inc./ 2131 Lindau Lane/ Suite 1000/ Bloomington, MN 55425


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