From b018a1e5a778808e35a12c1e7edd9b59fb8f6295 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 5 Aug 2009 02:25:11 +0000
Subject: [PATCH] One more. Transfer kill of the larger register when lowering
 an EXTRACT_SUBREG.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78145 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/LowerSubregs.cpp                  | 10 ++--
 .../Thumb2/2009-08-04-SubregLoweringBug3.ll   | 54 +++++++++++++++++++
 2 files changed, 60 insertions(+), 4 deletions(-)
 create mode 100644 test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug3.ll

diff --git a/lib/CodeGen/LowerSubregs.cpp b/lib/CodeGen/LowerSubregs.cpp
index 358aa16c486..2a12063af97 100644
--- a/lib/CodeGen/LowerSubregs.cpp
+++ b/lib/CodeGen/LowerSubregs.cpp
@@ -56,7 +56,8 @@ namespace {
     void TransferDeadFlag(MachineInstr *MI, unsigned DstReg,
                           const TargetRegisterInfo &TRI);
     void TransferKillFlag(MachineInstr *MI, unsigned SrcReg,
-                          const TargetRegisterInfo &TRI);
+                          const TargetRegisterInfo &TRI,
+                          bool AddIfNotFound = false);
   };
 
   char LowerSubregsInstructionPass::ID = 0;
@@ -88,10 +89,11 @@ LowerSubregsInstructionPass::TransferDeadFlag(MachineInstr *MI,
 void
 LowerSubregsInstructionPass::TransferKillFlag(MachineInstr *MI,
                                               unsigned SrcReg,
-                                              const TargetRegisterInfo &TRI) {
+                                              const TargetRegisterInfo &TRI,
+                                              bool AddIfNotFound) {
   for (MachineBasicBlock::iterator MII =
         prior(MachineBasicBlock::iterator(MI)); ; --MII) {
-    if (MII->addRegisterKilled(SrcReg, &TRI))
+    if (MII->addRegisterKilled(SrcReg, &TRI, AddIfNotFound))
       break;
     assert(MII != MI->getParent()->begin() &&
            "copyRegToReg output doesn't reference source register!");
@@ -142,7 +144,7 @@ bool LowerSubregsInstructionPass::LowerExtract(MachineInstr *MI) {
     if (MI->getOperand(0).isDead())
       TransferDeadFlag(MI, DstReg, TRI);
     if (MI->getOperand(1).isKill())
-      TransferKillFlag(MI, SrcReg, TRI);
+      TransferKillFlag(MI, SuperReg, TRI, true);
 
 #ifndef NDEBUG
     MachineBasicBlock::iterator dMI = MI;
diff --git a/test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug3.ll b/test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug3.ll
new file mode 100644
index 00000000000..5fc737e4b31
--- /dev/null
+++ b/test/CodeGen/Thumb2/2009-08-04-SubregLoweringBug3.ll
@@ -0,0 +1,54 @@
+; 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 = load i32* undef, align 4		; <i32> [#uses=1]
+	%1 = xor i32 %0, 123459876		; <i32> [#uses=1]
+	%2 = sdiv i32 %1, 127773		; <i32> [#uses=1]
+	%3 = mul i32 %2, 2836		; <i32> [#uses=1]
+	%4 = sub i32 0, %3		; <i32> [#uses=1]
+	%5 = xor i32 %4, 123459876		; <i32> [#uses=1]
+	%idum_addr.0.i.i = select i1 undef, i32 undef, i32 %5		; <i32> [#uses=1]
+	%6 = sitofp i32 %idum_addr.0.i.i to double		; <double> [#uses=1]
+	%7 = fmul double %6, 0x3E00000000200000		; <double> [#uses=1]
+	%8 = fptrunc double %7 to float		; <float> [#uses=2]
+	%9 = fmul float %8, 0x41E0000000000000		; <float> [#uses=1]
+	%10 = fptosi float %9 to i32		; <i32> [#uses=1]
+	store i32 %10, i32* undef, align 4
+	%11 = fpext float %8 to double		; <double> [#uses=1]
+	%12 = fcmp ogt double %11, 6.660000e-01		; <i1> [#uses=1]
+	br i1 %12, 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
+}
-- 
2.34.1