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| author | Andrew Trick <atrick@apple.com> | 2012-04-10 05:14:42 +0000 |
|---|---|---|
| committer | Andrew Trick <atrick@apple.com> | 2012-04-10 05:14:42 +0000 |
| commit | d9fc1ce8096f7138c60edc3a6655583bf209780e (patch) | |
| tree | f03561dfeb2555e6e05b5a4ed8ce54f6c618ce96 /lib/Transforms/Utils/LoopUnroll.cpp | |
| parent | 64c0748eb34272a6548980b3277aedebb6e6d265 (diff) | |
| download | llvm-d9fc1ce8096f7138c60edc3a6655583bf209780e.tar.gz llvm-d9fc1ce8096f7138c60edc3a6655583bf209780e.tar.bz2 llvm-d9fc1ce8096f7138c60edc3a6655583bf209780e.tar.xz | |
Fix 12513: Loop unrolling breaks with indirect branches.
Take this opportunity to generalize the indirectbr bailout logic for
loop transformations. CFG transformations will never get indirectbr
right, and there's no point trying.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154386 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Utils/LoopUnroll.cpp')
| -rw-r--r-- | lib/Transforms/Utils/LoopUnroll.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/LoopUnroll.cpp b/lib/Transforms/Utils/LoopUnroll.cpp index 512b689501..e15497a77a 100644 --- a/lib/Transforms/Utils/LoopUnroll.cpp +++ b/lib/Transforms/Utils/LoopUnroll.cpp @@ -149,6 +149,12 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, unsigned TripCount, return false; } + // Loops with indirectbr cannot be cloned. + if (!L->isSafeToClone()) { + DEBUG(dbgs() << " Can't unroll; Loop body cannot be cloned.\n"); + return false; + } + BasicBlock *Header = L->getHeader(); BranchInst *BI = dyn_cast<BranchInst>(LatchBlock->getTerminator()); |