From 31a52c200bac33007b4f5d0add609c53e0aac260 Mon Sep 17 00:00:00 2001
From: Dean Michael Berris <dberris@google.com>
Date: Thu, 1 Sep 2016 01:03:22 +0000
Subject: [PATCH] [XRay][NFC] Promote isTailCall() as virtual in
 TargetInstrInfo.

This change is broken out from D23986, where XRay detects tail call
exits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280331 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Target/TargetInstrInfo.h |  5 +++++
 lib/Target/Hexagon/HexagonInstrInfo.h |  5 ++++-
 lib/Target/X86/X86InstrInfo.cpp       | 23 +++++++++++++++++++++++
 lib/Target/X86/X86InstrInfo.h         |  2 ++
 4 files changed, 34 insertions(+), 1 deletion(-)

diff --git a/include/llvm/Target/TargetInstrInfo.h b/include/llvm/Target/TargetInstrInfo.h
index af0fc803a75..920a52daa7f 100644
--- a/include/llvm/Target/TargetInstrInfo.h
+++ b/include/llvm/Target/TargetInstrInfo.h
@@ -1481,6 +1481,11 @@ public:
     return None;
   }
 
+  /// Determines whether |Inst| is a tail call instruction.
+  virtual bool isTailCall(const MachineInstr &Inst) const {
+    return false;
+  }
+
 private:
   unsigned CallFrameSetupOpcode, CallFrameDestroyOpcode;
   unsigned CatchRetOpcode;
diff --git a/lib/Target/Hexagon/HexagonInstrInfo.h b/lib/Target/Hexagon/HexagonInstrInfo.h
index 4715a4ffcc3..fcb3f037354 100644
--- a/lib/Target/Hexagon/HexagonInstrInfo.h
+++ b/lib/Target/Hexagon/HexagonInstrInfo.h
@@ -340,7 +340,10 @@ public:
   bool isSignExtendingLoad(const MachineInstr &MI) const;
   bool isSolo(const MachineInstr &MI) const;
   bool isSpillPredRegOp(const MachineInstr &MI) const;
-  bool isTailCall(const MachineInstr &MI) const;
+
+  // Defined in Target.h.
+  bool isTailCall(const MachineInstr &MI) const override;
+
   bool isTC1(const MachineInstr &MI) const;
   bool isTC2(const MachineInstr &MI) const;
   bool isTC2Early(const MachineInstr &MI) const;
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index 0ba6dd85c6f..ee5ebfd6dba 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -8061,6 +8061,29 @@ X86InstrInfo::getSerializableDirectMachineOperandTargetFlags() const {
   return makeArrayRef(TargetFlags);
 }
 
+bool X86InstrInfo::isTailCall(const MachineInstr &Inst) const {
+  switch (Inst.getOpcode()) {
+    case X86::TCRETURNdi:
+    case X86::TCRETURNmi:
+    case X86::TCRETURNri:
+    case X86::TCRETURNdi64:
+    case X86::TCRETURNmi64:
+    case X86::TCRETURNri64:
+    case X86::TAILJMPd:
+    case X86::TAILJMPm:
+    case X86::TAILJMPr:
+    case X86::TAILJMPd64:
+    case X86::TAILJMPm64:
+    case X86::TAILJMPr64:
+    case X86::TAILJMPd64_REX:
+    case X86::TAILJMPm64_REX:
+    case X86::TAILJMPr64_REX:
+      return true;
+    default:
+      return false;
+  }
+}
+
 namespace {
   /// Create Global Base Reg pass. This initializes the PIC
   /// global base register for x86-32.
diff --git a/lib/Target/X86/X86InstrInfo.h b/lib/Target/X86/X86InstrInfo.h
index 5c8de0fe281..5fff2a3ac7d 100644
--- a/lib/Target/X86/X86InstrInfo.h
+++ b/lib/Target/X86/X86InstrInfo.h
@@ -541,6 +541,8 @@ public:
   ArrayRef<std::pair<unsigned, const char *>>
   getSerializableDirectMachineOperandTargetFlags() const override;
 
+  bool isTailCall(const MachineInstr &Inst) const override;
+
 protected:
   /// Commutes the operands in the given instruction by changing the operands
   /// order and/or changing the instruction's opcode and/or the immediate value