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Teach the DAGBuilder about lifetime markers which are generated from PHINodes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163494 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -5218,28 +5218,32 @@ SelectionDAGBuilder::visitIntrinsicCall(const CallInst &I, unsigned Intrinsic) {
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}
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case Intrinsic::lifetime_start:
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case Intrinsic::lifetime_end: {
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// Stack coloring is not enabled in O0, discard region information.
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if (TM.getOptLevel() == CodeGenOpt::None) {
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if (Intrinsic == Intrinsic::lifetime_start)
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setValue(&I, DAG.getUNDEF(TLI.getPointerTy()));
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return 0;
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}
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SDValue Ops[2];
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AllocaInst *LifetimeObject =dyn_cast_or_null<AllocaInst>(
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GetUnderlyingObject(I.getArgOperand(1), TD));
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// Could not find an Alloca.
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if (!LifetimeObject)
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return 0;
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int FI = FuncInfo.StaticAllocaMap[LifetimeObject];
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Ops[0] = getRoot();
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Ops[1] = DAG.getFrameIndex(FI, TLI.getPointerTy(), true);
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bool IsStart = (Intrinsic == Intrinsic::lifetime_start);
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unsigned Opcode = (IsStart ? ISD::LIFETIME_START : ISD::LIFETIME_END);
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// Stack coloring is not enabled in O0, discard region information.
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if (TM.getOptLevel() == CodeGenOpt::None)
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return 0;
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Res = DAG.getNode(Opcode, dl, MVT::Other, Ops, 2);
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DAG.setRoot(Res);
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return 0;
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SmallVector<Value *, 4> Allocas;
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GetUnderlyingObjects(I.getArgOperand(1), Allocas, TD);
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for (SmallVector<Value*, 4>::iterator Object = Allocas.begin(),
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E = Allocas.end(); Object != E; ++Object) {
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AllocaInst *LifetimeObject = dyn_cast_or_null<AllocaInst>(*Object);
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// Could not find an Alloca.
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if (!LifetimeObject)
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continue;
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int FI = FuncInfo.StaticAllocaMap[LifetimeObject];
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SDValue Ops[2];
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Ops[0] = getRoot();
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Ops[1] = DAG.getFrameIndex(FI, TLI.getPointerTy(), true);
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unsigned Opcode = (IsStart ? ISD::LIFETIME_START : ISD::LIFETIME_END);
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Res = DAG.getNode(Opcode, dl, MVT::Other, Ops, 2);
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DAG.setRoot(Res);
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}
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}
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case Intrinsic::invariant_start:
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// Discard region information.
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@ -262,6 +262,41 @@ entry:
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ret void
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}
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;YESCOLOR: subq $272, %rsp
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;NOCOLOR: subq $272, %rsp
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define i32 @func_phi_lifetime(i32 %in, i1 %d) {
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entry:
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%a = alloca [17 x i8*], align 8
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%a2 = alloca [16 x i8*], align 8
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%b = bitcast [17 x i8*]* %a to i8*
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%b2 = bitcast [16 x i8*]* %a2 to i8*
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%t1 = call i32 @foo(i32 %in, i8* %b)
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%t2 = call i32 @foo(i32 %in, i8* %b)
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call void @llvm.lifetime.end(i64 -1, i8* %b)
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br i1 %d, label %bb0, label %bb1
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bb0:
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%I1 = bitcast [17 x i8*]* %a to i8*
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br label %bb2
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bb1:
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%I2 = bitcast [16 x i8*]* %a2 to i8*
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br label %bb2
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bb2:
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%split = phi i8* [ %I1, %bb0 ], [ %I2, %bb1 ]
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call void @llvm.lifetime.start(i64 -1, i8* %split)
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%t3 = call i32 @foo(i32 %in, i8* %b2)
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%t4 = call i32 @foo(i32 %in, i8* %b2)
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%t5 = add i32 %t1, %t2
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%t6 = add i32 %t3, %t4
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%t7 = add i32 %t5, %t6
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call void @llvm.lifetime.end(i64 -1, i8* %split)
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ret i32 %t7
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bb3:
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ret i32 0
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}
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declare void @bar([100 x i32]* , [100 x i32]*) nounwind
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declare void @llvm.lifetime.start(i64, i8* nocapture) nounwind
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