jdoerfert 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) ||
----------------
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.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D71475/new/
https://reviews.llvm.org/D71475
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