ABataev added inline comments.
================
Comment at: clang/lib/Sema/SemaOpenMP.cpp:1128
+ (A == OMPC_firstprivate && (Data.Attributes == OMPC_lastprivate ||
+ Data.Attributes == OMPC_linear)) ||
(A == OMPC_lastprivate && Data.Attributes == OMPC_firstprivate) ||
----------------
jdoerfert wrote:
> ABataev wrote:
> > jdoerfert wrote:
> > > ABataev wrote:
> > > > cchen wrote:
> > > > > ABataev wrote:
> > > > > > What is this change for?
> > > > > Since now the variable in step expression has been set as implicit
> > > > > firstprivate.
> > > > No need to do this, the whole expression must be evaluated before
> > > > entering the parallel region.
> > > The standard is not clear on this, e.g., what if the expression has a
> > > side-effect and the loop has 0 iterations. However, evaluating it once in
> > > the beginning seems fine to me, assuming we do not evaluate it later
> > > again.
> > The standard says: `The linear-step expression must be invariant during the
> > execution of the region that corresponds to the construct.` So, it is ok to
> > evaluate it at the entrance to the region. The only thing that (maybe)
> > required is to check that the expression is really invariant in the
> > analysis phase.
> I'll just repeat the under-specified case you seem to have missed while
> reading my comment:
>
> > What if the expression has a side-effect and the loop has 0 iterations.
>
>
>
>
Yes, this is not specified
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D71475/new/
https://reviews.llvm.org/D71475
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