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[Unroll] Replace a hand-wavy FIXME with a FIXME that explains the actual

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problem instead of suggesting doing something that is trivial to do but
incorrect given the current design of the libraries.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237994 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2015-05-22 03:07:28 +00:00
parent f5ed85b2c8
commit edcdc5cb6a
1 changed files with 6 additions and 1 deletions
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7
lib/Transforms/Scalar/LoopUnrollPass.cpp
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@ -349,9 +349,14 @@ buildSCEVGEPCache(const Loop &L, ScalarEvolution &SE) {
if (!SE.isSCEVable(V->getType()))
continue;
const SCEV *S = SE.getSCEV(V);
// FIXME: Hoist the initialization out of the loop.
// FIXME: It'd be nice if the worklist and set used by the
// SCEVTraversal could be re-used between loop iterations, but the
// interface doesn't support that. There is no way to clear the visited
// sets between uses.
FindConstantPointers Visitor(&L, SE);
SCEVTraversal<FindConstantPointers> T(Visitor);
// Try to find (BaseAddress+Step+Offset) tuple.
// If succeeded, save it to the cache - it might help in folding
// loads.