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[NFC] Teach getInnermostLoopFor walk up the loop trees

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This should be NFC in current use case of this method, but it will
help to use it for solving more compex tasks in follow-up patches.

llvm-svn: 354227
This commit is contained in:
Max Kazantsev 2019-02-17 18:21:51 +00:00
parent 33359a68d7
commit 5987038dc3
1 changed files with 10 additions and 6 deletions
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16
lib/Transforms/Scalar/LoopSimplifyCFG.cpp
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@ -94,15 +94,19 @@ static void removeBlockFromLoops(BasicBlock *BB, Loop *FirstLoop,
/// contains the header of loop \p L.
static Loop *getInnermostLoopFor(SmallPtrSetImpl<BasicBlock *> &BBs,
Loop &L, LoopInfo &LI) {
Loop *StillReachable = nullptr;
Loop *Innermost = nullptr;
for (BasicBlock *BB : BBs) {
Loop *BBL = LI.getLoopFor(BB);
if (BBL && BBL->contains(L.getHeader()))
if (!StillReachable ||
BBL->getLoopDepth() > StillReachable->getLoopDepth())
StillReachable = BBL;
while (BBL && !BBL->contains(L.getHeader()))
BBL = BBL->getParentLoop();
if (BBL == &L)
BBL = BBL->getParentLoop();
if (!BBL)
continue;
if (!Innermost || BBL->getLoopDepth() > Innermost->getLoopDepth())
Innermost = BBL;
}
return StillReachable;
return Innermost;
}
namespace {