From 92b8543819f303e22078ffc18938e4c78f56abc9 Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@mips.com>
Date: Wed, 27 Nov 2013 23:58:32 +0000
Subject: [PATCH] [mips] Redefine TAILCALL as a pseudo instruction.

No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195896 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Mips/MicroMipsInstrInfo.td |  4 ----
 lib/Target/Mips/Mips64InstrInfo.td    |  3 +--
 lib/Target/Mips/MipsInstrInfo.td      | 18 ++++++++++++++----
 3 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/lib/Target/Mips/MicroMipsInstrInfo.td b/lib/Target/Mips/MicroMipsInstrInfo.td
index d9507fa88eb..846ced0883d 100644
--- a/lib/Target/Mips/MicroMipsInstrInfo.td
+++ b/lib/Target/Mips/MicroMipsInstrInfo.td
@@ -175,13 +175,9 @@ let DecoderNamespace = "MicroMips", Predicates = [InMicroMips] in {
     def J_MM        : MMRel, JumpFJ<jmptarget_mm, "j", br, bb, "j">,
                       J_FM_MM<0x35>;
     def JAL_MM      : MMRel, JumpLink<"jal", calltarget_mm>, J_FM_MM<0x3d>;
-    def TAILCALL_MM : MMRel, JumpFJ<calltarget_mm, "j", MipsTailCall, imm,
-                                    "tcall">, J_FM_MM<0x3d>, IsTailCall;
   }
   def JR_MM   : MMRel, IndirectBranch<"jr", GPR32Opnd>, JR_FM_MM<0x3c>;
   def JALR_MM : MMRel, JumpLinkReg<"jalr", GPR32Opnd>, JALR_FM_MM<0x03c>;
-  def TAILCALL_R_MM : MMRel, JumpFR<"tcallr", GPR32Opnd, MipsTailCall>,
-                      JR_FM_MM<0x3c>, IsTailCall;
   def RET_MM : MMRel, RetBase<"ret", GPR32Opnd>, JR_FM_MM<0x3c>;
 
   /// Branch Instructions
diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index 15ef654555d..0fb83839ddc 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -159,8 +159,7 @@ def BLEZ64 : CBranchZero<"blez", brtarget, setle, GPR64Opnd>, BGEZ_FM<6, 0>;
 def BLTZ64 : CBranchZero<"bltz", brtarget, setlt, GPR64Opnd>, BGEZ_FM<1, 0>;
 def JALR64 : JumpLinkReg<"jalr", GPR64Opnd>, JALR_FM;
 def JALR64Pseudo : JumpLinkRegPseudo<GPR64Opnd, JALR, RA, GPR32Opnd>;
-def TAILCALL64_R : JumpFR<"tcallr", GPR64Opnd, MipsTailCall>,
-                   MTLO_FM<8>, IsTailCall;
+def TAILCALL64_R : TailCallReg<GPR64Opnd, JR, GPR32Opnd>;
 }
 
 /// Multiply and Divide Instructions.
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index ebdbaa416fc..cc76f7edbc6 100644
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -611,6 +611,18 @@ let isCall=1, hasDelaySlot=1, Defs = [RA] in {
 
 }
 
+let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1, hasDelaySlot = 1,
+    hasExtraSrcRegAllocReq = 1, Defs = [AT] in {
+  class TailCall<Instruction JumpInst> :
+    PseudoSE<(outs), (ins calltarget:$target), [], IIBranch>,
+    PseudoInstExpansion<(JumpInst jmptarget:$target)>;
+
+  class TailCallReg<RegisterOperand RO, Instruction JRInst,
+                    RegisterOperand ResRO = RO> :
+    PseudoSE<(outs), (ins RO:$rs), [(MipsTailCall RO:$rs)], IIBranch>,
+    PseudoInstExpansion<(JRInst ResRO:$rs)>;
+}
+
 class BAL_BR_Pseudo<Instruction RealInst> :
   PseudoSE<(outs), (ins brtarget:$offset), [], IIBranch>,
   PseudoInstExpansion<(RealInst ZERO, brtarget:$offset)> {
@@ -1018,10 +1030,8 @@ def JALRPseudo : JumpLinkRegPseudo<GPR32Opnd, JALR, RA>;
 def BGEZAL : MMRel, BGEZAL_FT<"bgezal", brtarget, GPR32Opnd>, BGEZAL_FM<0x11>;
 def BLTZAL : MMRel, BGEZAL_FT<"bltzal", brtarget, GPR32Opnd>, BGEZAL_FM<0x10>;
 def BAL_BR : BAL_BR_Pseudo<BGEZAL>;
-def TAILCALL : MMRel, JumpFJ<calltarget, "j", MipsTailCall, imm, "tcall">,
-               FJ<2>, IsTailCall;
-def TAILCALL_R : MMRel, JumpFR<"tcallr", GPR32Opnd, MipsTailCall>, MTLO_FM<8>,
-                 IsTailCall;
+def TAILCALL : TailCall<J>;
+def TAILCALL_R : TailCallReg<GPR32Opnd, JR>;
 
 def RET : MMRel, RetBase<"ret", GPR32Opnd>, MTLO_FM<8>;
 
-- 
2.34.1