From 8cf77137533f1d83f9ea0085b5ca6d241f4bab9a Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Wed, 3 Dec 2008 18:11:40 +0000
Subject: [PATCH] Extend X86's addFrameReference to add a MachineMemOperand for
 the frame reference. This will help post-RA scheduling determine that spills
 to distinct stack slots are independent.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60486 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/CodeGen/MachineFrameInfo.h    |  6 +++---
 include/llvm/CodeGen/MachineInstrBuilder.h |  5 +++++
 lib/Target/X86/X86InstrBuilder.h           | 19 ++++++++++++++++++-
 3 files changed, 26 insertions(+), 4 deletions(-)

diff --git a/include/llvm/CodeGen/MachineFrameInfo.h b/include/llvm/CodeGen/MachineFrameInfo.h
index a6b91441fac..e8cddad86ff 100644
--- a/include/llvm/CodeGen/MachineFrameInfo.h
+++ b/include/llvm/CodeGen/MachineFrameInfo.h
@@ -99,7 +99,7 @@ class MachineFrameInfo {
     // the function.  This field has no meaning for a variable sized element.
     int64_t SPOffset;
     
-    StackObject(uint64_t Sz, unsigned Al, int64_t SP, bool IM = false)
+    StackObject(uint64_t Sz, unsigned Al, int64_t SP = 0, bool IM = false)
       : Size(Sz), Alignment(Al), isImmutable(IM), SPOffset(SP) {}
   };
 
@@ -355,7 +355,7 @@ public:
   ///
   int CreateStackObject(uint64_t Size, unsigned Alignment) {
     assert(Size != 0 && "Cannot allocate zero size stack objects!");
-    Objects.push_back(StackObject(Size, Alignment, -1));
+    Objects.push_back(StackObject(Size, Alignment));
     return (int)Objects.size()-NumFixedObjects-1;
   }
 
@@ -373,7 +373,7 @@ public:
   ///
   int CreateVariableSizedObject() {
     HasVarSizedObjects = true;
-    Objects.push_back(StackObject(0, 1, -1));
+    Objects.push_back(StackObject(0, 1));
     return (int)Objects.size()-NumFixedObjects-1;
   }
   
diff --git a/include/llvm/CodeGen/MachineInstrBuilder.h b/include/llvm/CodeGen/MachineInstrBuilder.h
index f57168b2766..ffe5fbe0441 100644
--- a/include/llvm/CodeGen/MachineInstrBuilder.h
+++ b/include/llvm/CodeGen/MachineInstrBuilder.h
@@ -89,6 +89,11 @@ public:
     MI->addOperand(MachineOperand::CreateES(FnName, Offset));
     return *this;
   }
+
+  const MachineInstrBuilder &addMemOperand(const MachineMemOperand &MMO) const {
+    MI->addMemOperand(*MI->getParent()->getParent(), MMO);
+    return *this;
+  }
 };
 
 /// BuildMI - Builder interface.  Specify how to create the initial instruction
diff --git a/lib/Target/X86/X86InstrBuilder.h b/lib/Target/X86/X86InstrBuilder.h
index 87c63421bc8..74f9e05ffe4 100644
--- a/lib/Target/X86/X86InstrBuilder.h
+++ b/lib/Target/X86/X86InstrBuilder.h
@@ -24,7 +24,9 @@
 #ifndef X86INSTRBUILDER_H
 #define X86INSTRBUILDER_H
 
+#include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/PseudoSourceValue.h"
 
 namespace llvm {
 
@@ -109,7 +111,22 @@ inline const MachineInstrBuilder &addFullAddress(const MachineInstrBuilder &MIB,
 ///
 inline const MachineInstrBuilder &
 addFrameReference(const MachineInstrBuilder &MIB, int FI, int Offset = 0) {
-  return MIB.addFrameIndex(FI).addImm(1).addReg(0).addImm(Offset);
+  MachineInstr *MI = MIB;
+  MachineFunction &MF = *MI->getParent()->getParent();
+  MachineFrameInfo &MFI = *MF.getFrameInfo();
+  const TargetInstrDesc &TID = MI->getDesc();
+  unsigned Flags = 0;
+  if (TID.mayLoad())
+    Flags |= MachineMemOperand::MOLoad;
+  if (TID.mayStore())
+    Flags |= MachineMemOperand::MOStore;
+  MachineMemOperand MMO(PseudoSourceValue::getFixedStack(FI),
+                        Flags,
+                        MFI.getObjectOffset(FI) + Offset,
+                        MFI.getObjectSize(FI),
+                        MFI.getObjectAlignment(FI));
+  return MIB.addFrameIndex(FI).addImm(1).addReg(0).addImm(Offset)
+            .addMemOperand(MMO);
 }
 
 /// addConstantPoolReference - This function is used to add a reference to the
-- 
2.34.1