diff options
Diffstat (limited to 'llvm/lib/Analysis/ScalarEvolution.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ScalarEvolution.cpp | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp index 7a9fddfd10b..e25247072c5 100644 --- a/llvm/lib/Analysis/ScalarEvolution.cpp +++ b/llvm/lib/Analysis/ScalarEvolution.cpp @@ -8669,7 +8669,8 @@ bool ScalarEvolution::isKnownPredicate(ICmpInst::Predicate Pred, bool RightGuarded = false; if (LAR) { const Loop *L = LAR->getLoop(); - if (isLoopEntryGuardedByCond(L, Pred, LAR->getStart(), RHS) && + if (isAvailableAtLoopEntry(RHS, L) && + isLoopEntryGuardedByCond(L, Pred, LAR->getStart(), RHS) && isLoopBackedgeGuardedByCond(L, Pred, LAR->getPostIncExpr(*this), RHS)) { if (!RAR) return true; LeftGuarded = true; @@ -8677,7 +8678,8 @@ bool ScalarEvolution::isKnownPredicate(ICmpInst::Predicate Pred, } if (RAR) { const Loop *L = RAR->getLoop(); - if (isLoopEntryGuardedByCond(L, Pred, LHS, RAR->getStart()) && + if (isAvailableAtLoopEntry(LHS, L) && + isLoopEntryGuardedByCond(L, Pred, LHS, RAR->getStart()) && isLoopBackedgeGuardedByCond(L, Pred, LHS, RAR->getPostIncExpr(*this))) { if (!LAR) return true; RightGuarded = true; @@ -9058,6 +9060,12 @@ bool ScalarEvolution::isLoopEntryGuardedByCond(const Loop *L, ICmpInst::Predicate Pred, const SCEV *LHS, const SCEV *RHS) { + // Both LHS and RHS must be available at loop entry. + assert(isAvailableAtLoopEntry(LHS, L) && + "LHS is not available at Loop Entry"); + assert(isAvailableAtLoopEntry(RHS, L) && + "RHS is not available at Loop Entry"); + // Interpret a null as meaning no loop, where there is obviously no guard // (interprocedural conditions notwithstanding). if (!L) return false; |
