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[MemorySSA] Check for unreachable blocks when getting last definition.
If a single predecessor is found, still check if the block is unreachable. The test that found this had a self loop unreachable block. Resolves PR43493. llvm-svn: 373383
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@ -839,6 +839,9 @@ void MemorySSAUpdater::applyInsertUpdates(ArrayRef<CFGUpdate> Updates,
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} else {
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} else {
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// Single predecessor, BB cannot be dead. GetLastDef of Pred.
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// Single predecessor, BB cannot be dead. GetLastDef of Pred.
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assert(Count == 1 && Pred && "Single predecessor expected.");
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assert(Count == 1 && Pred && "Single predecessor expected.");
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// BB can be unreachable though, return LoE if that is the case.
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if (!DT.getNode(BB))
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return MSSA->getLiveOnEntryDef();
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BB = Pred;
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BB = Pred;
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}
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}
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};
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};
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27
test/Analysis/MemorySSA/pr43493.ll
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27
test/Analysis/MemorySSA/pr43493.ll
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@ -0,0 +1,27 @@
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; RUN: opt -enable-mssa-loop-dependency=true -loop-rotate -verify-memoryssa -S %s | FileCheck %s
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; REQUIRES: asserts
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; CHECK-LABEL: @func_35()
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define void @func_35() {
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entry:
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br i1 undef, label %for.cond1704.preheader, label %return
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for.cond1704.preheader: ; preds = %entry
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br label %for.cond1704
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for.cond1704: ; preds = %for.cond1704.preheader, %for.body1707
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br i1 false, label %for.body1707, label %return.loopexit
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for.body1707: ; preds = %for.cond1704
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store i32 1712, i32* undef, align 1
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br label %for.cond1704
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for.body1102: ; preds = %for.body1102
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br i1 undef, label %for.body1102, label %return
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return.loopexit: ; preds = %for.cond1704
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br label %return
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return: ; preds = %return.loopexit, %for.body1102, %entry
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ret void
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}
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