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[OPENMP] A helper for marking intstructions with llvm.mem.parallel_loop_access
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Authored by amusman on May 7 2014, 6:12 AM.

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Summary

This patch adds a helper class (CGLoopInfo) for marking memory instructions with llvm.mem.parallel_loop_access metadata.
It also adds a simple initial version of codegen for pragma omp simd (it will change in the future to support all the clauses).

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rL LLVM

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amusman updated this revision to Diff 9161.May 7 2014, 6:12 AM
amusman retitled this revision from to [OPENMP] A helper for marking intstructions with llvm.mem.parallel_loop_access.
amusman updated this object.
amusman edited the test plan for this revision. (Show Details)
amusman added a subscriber: Unknown Object (MLST).
hfinkel edited edge metadata.May 21 2014, 9:10 AM

With these changes, LGTM.

lib/CodeGen/CGBuilder.h
50 ↗(On Diff #9161)

This is now a lot of parameters to be duplicated in both sizes of the NDEBUG conditional. You can, for example, define a boolean that depends on NDEBUG and use that instead.

lib/CodeGen/CGLoopInfo.cpp
89 ↗(On Diff #9161)

This assert is not self explanatory. Please write:

assert(!Active.empty() && "No active loops to pop");

(or something like that).

115 ↗(On Diff #9161)

This is not quite complete. It misses memory intrinsics, for example. The check in LLVM's lib/Analysis/LoopInfo.cpp requires metadata on all instructions for which mayReadOrWriteMemory() returns true.

I think this can be:

if (L.getAttributes().IsParallel && I->mayReadOrWriteMemory())
  I->setMetadata("llvm.mem.parallel_loop_access", L.getLoopID());
lib/CodeGen/CodeGenFunction.cpp
1668 ↗(On Diff #9161)

Same comment here (don't duplicate all of this, just use a boolean or some other mechanism).

amusman closed this revision.May 22 2014, 2:01 AM
amusman updated this revision to Diff 9680.

Closed by commit rL209411 (authored by @amusman).