diff options
Diffstat (limited to 'llvm/lib/Transforms/Utils/LoopUtils.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Utils/LoopUtils.cpp | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp index 202c17d..e2eae48 100644 --- a/llvm/lib/Transforms/Utils/LoopUtils.cpp +++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp @@ -1289,13 +1289,6 @@ int llvm::rewriteLoopExitValues(Loop *L, LoopInfo *LI, TargetLibraryInfo *TLI, if (!SE->isSCEVable(PN->getType())) continue; - // It's necessary to tell ScalarEvolution about this explicitly so that - // it can walk the def-use list and forget all SCEVs, as it may not be - // watching the PHI itself. Once the new exit value is in place, there - // may not be a def-use connection between the loop and every instruction - // which got a SCEVAddRecExpr for that loop. - SE->forgetValue(PN); - // Iterate over all of the values in all the PHI nodes. for (unsigned i = 0; i != NumPreds; ++i) { // If the value being merged in is not integer or is not defined @@ -1401,6 +1394,12 @@ int llvm::rewriteLoopExitValues(Loop *L, LoopInfo *LI, TargetLibraryInfo *TLI, NumReplaced++; Instruction *Inst = cast<Instruction>(PN->getIncomingValue(Phi.Ith)); PN->setIncomingValue(Phi.Ith, ExitVal); + // It's necessary to tell ScalarEvolution about this explicitly so that + // it can walk the def-use list and forget all SCEVs, as it may not be + // watching the PHI itself. Once the new exit value is in place, there + // may not be a def-use connection between the loop and every instruction + // which got a SCEVAddRecExpr for that loop. + SE->forgetValue(PN); // If this instruction is dead now, delete it. Don't do it now to avoid // invalidating iterators. |