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:
> > 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.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D71475/new/
https://reviews.llvm.org/D71475
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