From a395f4df5b6d9c2feb661091ca75be2500d07cb0 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 11 Oct 2012 00:15:48 +0000
Subject: [PATCH] Change MachineInstrBuilder::addDisp to copy over target flags
 by default.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165677 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/MachineInstrBuilder.h | 17 +++++++++++++----
 lib/Target/X86/X86ISelLowering.cpp         |  7 ++-----
 2 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/include/llvm/CodeGen/MachineInstrBuilder.h b/include/llvm/CodeGen/MachineInstrBuilder.h
index 654361f9d42..770685358ab 100644
--- a/include/llvm/CodeGen/MachineInstrBuilder.h
+++ b/include/llvm/CodeGen/MachineInstrBuilder.h
@@ -176,15 +176,24 @@ public:
   }
 
   // Add a displacement from an existing MachineOperand with an added offset.
-  const MachineInstrBuilder &addDisp(const MachineOperand &Disp,
-                                     int64_t off) const {
+  const MachineInstrBuilder &addDisp(const MachineOperand &Disp, int64_t off,
+                                     unsigned char TargetFlags = 0) const {
     switch (Disp.getType()) {
       default:
         llvm_unreachable("Unhandled operand type in addDisp()");
       case MachineOperand::MO_Immediate:
         return addImm(Disp.getImm() + off);
-      case MachineOperand::MO_GlobalAddress:
-        return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off);
+      case MachineOperand::MO_GlobalAddress: {
+        // If caller specifies new TargetFlags then use it, otherwise the
+        // default behavior is to copy the target flags from the existing
+        // MachineOperand. This means if the caller wants to clear the
+        // target flags it needs to do so explicitly.
+        if (TargetFlags)
+          return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off,
+                                  TargetFlags);
+        return addGlobalAddress(Disp.getGlobal(), Disp.getOffset() + off,
+                                Disp.getTargetFlags());
+      }
     }
   }
 };
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 2fbc6bd3148..9ff05a2d112 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -12329,12 +12329,9 @@ X86TargetLowering::EmitAtomicLoadArith6432(MachineInstr *MI,
   // Hi
   MIB = BuildMI(thisMBB, DL, TII->get(LOADOpc), X86::EDX);
   for (unsigned i = 0; i < X86::AddrNumOperands; ++i) {
-    if (i == X86::AddrDisp) {
+    if (i == X86::AddrDisp)
       MIB.addDisp(MI->getOperand(MemOpndSlot + i), 4); // 4 == sizeof(i32)
-      // Don't forget to transfer the target flag.
-      MachineOperand &MO = MIB->getOperand(MIB->getNumOperands()-1);
-      MO.setTargetFlags(MI->getOperand(MemOpndSlot + i).getTargetFlags());
-    } else
+    else
       MIB.addOperand(MI->getOperand(MemOpndSlot + i));
   }
   MIB.setMemRefs(MMOBegin, MMOEnd);