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Fix a bug where RecursivelyDeleteTriviallyDeadInstructions could
delete the instruction pointed to by CGP's current instruction iterator, leading to a crash on the testcase. This fixes PR9578. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129200 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -889,12 +889,27 @@ bool CodeGenPrepare::OptimizeMemoryInst(Instruction *MemoryInst, Value *Addr,
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MemoryInst->replaceUsesOfWith(Repl, SunkAddr);
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// If we have no uses, recursively delete the value and all dead instructions
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// using it.
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if (Repl->use_empty()) {
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// This can cause recursive deletion, which can invalidate our iterator.
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// Use a WeakVH to hold onto it in case this happens.
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WeakVH IterHandle(CurInstIterator);
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BasicBlock *BB = CurInstIterator->getParent();
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RecursivelyDeleteTriviallyDeadInstructions(Repl);
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// This address is now available for reassignment, so erase the table entry;
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// we don't want to match some completely different instruction.
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if (IterHandle != CurInstIterator) {
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// If the iterator instruction was recursively deleted, start over at the
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// start of the block.
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CurInstIterator = BB->begin();
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SunkAddrs.clear();
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} else {
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// This address is now available for reassignment, so erase the table
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// entry; we don't want to match some completely different instruction.
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SunkAddrs[Addr] = 0;
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}
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}
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++NumMemoryInsts;
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return true;
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}
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@ -38,3 +38,31 @@ unreachable
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declare void @Parse_Vector(double*)
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declare i32 @llvm.objectsize.i32(i8*, i1)
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; PR9578
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%struct.S0 = type { i32, i8, i32 }
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define void @func_82() nounwind optsize {
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entry:
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br label %for.body.i
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for.body.i: ; preds = %for.body.i, %entry
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br i1 undef, label %func_74.exit.for.cond29.thread_crit_edge, label %for.body.i
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func_74.exit.for.cond29.thread_crit_edge: ; preds = %for.body.i
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%f13576.pre = getelementptr inbounds %struct.S0* undef, i64 0, i32 1
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store i8 0, i8* %f13576.pre, align 4, !tbaa !0
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br label %lbl_468
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lbl_468: ; preds = %lbl_468, %func_74.exit.for.cond29.thread_crit_edge
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%f13577.ph = phi i8* [ %f13576.pre, %func_74.exit.for.cond29.thread_crit_edge ], [ %f135.pre, %lbl_468 ]
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store i8 1, i8* %f13577.ph, align 1
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%f135.pre = getelementptr inbounds %struct.S0* undef, i64 0, i32 1
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br i1 undef, label %lbl_468, label %for.end74
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for.end74: ; preds = %lbl_468
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ret void
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}
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!0 = metadata !{metadata !"omnipotent char", metadata !1}
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!1 = metadata !{metadata !"Simple C/C++ TBAA", null}
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