One more place where subreg lowering forgot to transfer undefness.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78144 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp
index e9e60a0..358aa16 100644
--- a/lib/CodeGen/LowerSubregs.cpp
+++ b/lib/CodeGen/LowerSubregs.cpp
@@ -242,9 +242,12 @@
// No need to insert an identity copy instruction. If the SrcReg was
// <undef>, we need to make sure it is alive by inserting an IMPLICIT_DEF
if (MI->getOperand(1).isUndef() && !MI->getOperand(0).isDead()) {
- BuildMI(*MBB, MI, MI->getDebugLoc(),
- TII.get(TargetInstrInfo::IMPLICIT_DEF), DstReg)
- .addReg(InsReg, RegState::ImplicitKill);
+ MachineInstrBuilder MIB = BuildMI(*MBB, MI, MI->getDebugLoc(),
+ TII.get(TargetInstrInfo::IMPLICIT_DEF), DstReg);
+ if (MI->getOperand(2).isUndef())
+ MIB.addReg(InsReg, RegState::Implicit | RegState::Undef);
+ else
+ MIB.addReg(InsReg, RegState::ImplicitKill);
} else {
DOUT << "subreg: eliminated!\n";
MBB->erase(MI);
diff --git a/test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug2.ll b/test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug2.ll
new file mode 100644
index 0000000..a0fdfd7
--- /dev/null
+++ b/test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug2.ll
@@ -0,0 +1,42 @@
+; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin9 -mattr=+neon,+neonfp
+; rdar://7117307
+
+ %struct.Hosp = type { i32, i32, i32, %struct.List, %struct.List, %struct.List, %struct.List }
+ %struct.List = type { %struct.List*, %struct.Patient*, %struct.List* }
+ %struct.Patient = type { i32, i32, i32, %struct.Village* }
+ %struct.Village = type { [4 x %struct.Village*], %struct.Village*, %struct.List, %struct.Hosp, i32, i32 }
+
+define arm_apcscc %struct.List* @sim(%struct.Village* %village) nounwind {
+entry:
+ br i1 undef, label %bb14, label %bb3.preheader
+
+bb3.preheader: ; preds = %entry
+ br label %bb5
+
+bb5: ; preds = %bb5, %bb3.preheader
+ br i1 undef, label %bb11, label %bb5
+
+bb11: ; preds = %bb5
+ %0 = fmul float undef, 0x41E0000000000000 ; <float> [#uses=1]
+ %1 = fptosi float %0 to i32 ; <i32> [#uses=1]
+ store i32 %1, i32* undef, align 4
+ br i1 undef, label %generate_patient.exit, label %generate_patient.exit.thread
+
+generate_patient.exit.thread: ; preds = %bb11
+ ret %struct.List* null
+
+generate_patient.exit: ; preds = %bb11
+ br i1 undef, label %bb14, label %bb12
+
+bb12: ; preds = %generate_patient.exit
+ br i1 undef, label %bb.i, label %bb1.i
+
+bb.i: ; preds = %bb12
+ ret %struct.List* null
+
+bb1.i: ; preds = %bb12
+ ret %struct.List* null
+
+bb14: ; preds = %generate_patient.exit, %entry
+ ret %struct.List* undef
+}