[PATCH] D48808: [CodeGen] Emit parallel_loop_access for each loop in the loop stack.

Hal Finkel via Phabricator via cfe-commits cfe-commits at lists.llvm.org
Mon Jul 2 08:41:02 PDT 2018

hfinkel added a comment.

In https://reviews.llvm.org/D48808#1149534, @ABataev wrote:

> I don't think that this is the intended behavior of the `#pragma clang loop`. it is better to ask the author of this pragma is this correct or not.

It is the intended behavior that the memory accesses are independent with respect to the outer (annotated) loop (even if those accesses are within an inner loop). They're not independent with respect to the inner loop unless that loop is also annotated. Thus, this looks correct.

Michael, can you please add a test with two inner loops, one where more than one is annotated, and one where only the outer loop is annotated? It's not clear to me that I->setMetadata will do the right thing here in the former case.

  rC Clang


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