From 01a75c46e3292c1a66b577b5a6b7510a1867afdd Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@mips.com>
Date: Fri, 19 Oct 2012 21:14:34 +0000
Subject: [PATCH] [mips] Add tail call instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166338 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Mips/Mips64InstrInfo.td |  1 +
 lib/Target/Mips/MipsInstrInfo.td   | 11 +++++++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index 99a9f25abd2..ed0ea0e849a 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -177,6 +177,7 @@ def BLTZ64 : CBranchZero<0x01, 0, "bltz", setlt, CPU64Regs>;
 }
 let DecoderNamespace = "Mips64" in
 def JALR64 : JumpLinkReg<0x00, 0x09, "jalr", CPU64Regs>;
+def TAILCALL64_R : JumpFR<CPU64Regs, MipsTailCall>, IsTailCall;
 
 let DecoderNamespace = "Mips64" in {
 /// Multiply and Divide Instructions.
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index f4fd8913d01..82a15efa46b 100644
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -191,6 +191,15 @@ class IsCall {
   bit isCall = 1;
 }
 
+class IsTailCall {
+  bit isCall = 1;
+  bit isTerminator = 1;
+  bit isReturn = 1;
+  bit isBarrier = 1;
+  bit hasExtraSrcRegAllocReq = 1;
+  bit isCodeGenOnly = 1;
+}
+
 //===----------------------------------------------------------------------===//
 // Instruction format superclass
 //===----------------------------------------------------------------------===//
@@ -1013,6 +1022,8 @@ def JAL  : JumpLink<0x03, "jal">;
 def JALR : JumpLinkReg<0x00, 0x09, "jalr", CPURegs>;
 def BGEZAL  : BranchLink<"bgezal", 0x11, CPURegs>;
 def BLTZAL  : BranchLink<"bltzal", 0x10, CPURegs>;
+def TAILCALL : JumpFJ<0x02, "j", br>, IsTailCall;
+def TAILCALL_R : JumpFR<CPURegs, MipsTailCall>, IsTailCall;
 
 def RET : RetBase<CPURegs>;