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fix: SLPVectorizer crashes for unreachable blocks containing not schedulable instructions.

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In unreachable blocks it's legal to have instructions like "%x = op %x".
Such instuctions are not schedulable. Therefore the SLPVectorizer has to check for
unreachable blocks and ignore them.

Fixes bug 20646.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216256 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Erik Eckstein
2014-08-22 01:18:39 +00:00
parent f5377021c5
commit 6ca2d8b7c7
2 changed files with 48 additions and 0 deletions
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lib/Transforms/Vectorize/SLPVectorizer.cpp
+8
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@@ -976,6 +976,14 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
Instruction *VL0 = cast<Instruction>(VL[0]);
BasicBlock *BB = cast<Instruction>(VL0)->getParent();
if (!DT->isReachableFromEntry(BB)) {
// Don't go into unreachable blocks. They may contain instructions with
// dependency cycles which confuse the final scheduling.
DEBUG(dbgs() << "SLP: bundle in unreachable block.\n");
newTreeEntry(VL, false);
return;
}
// Check that every instructions appears once in this bundle.
for (unsigned i = 0, e = VL.size(); i < e; ++i)
for (unsigned j = i+1; j < e; ++j)