From 4267b16e789d4c6bdde344e25cec14fb386e0ba0 Mon Sep 17 00:00:00 2001
From: Zoran Jovanovic <zoran.jovanovic@imgtec.com>
Date: Thu, 19 Dec 2013 16:12:56 +0000
Subject: Support for microMIPS LL and SC instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197692 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Mips/MicroMipsInstrFormats.td | 13 +++++++++++++
 lib/Target/Mips/MicroMipsInstrInfo.td    | 19 +++++++++++++++++++
 lib/Target/Mips/MipsISelLowering.cpp     | 10 ++++++----
 lib/Target/Mips/MipsISelLowering.h       |  1 +
 lib/Target/Mips/MipsInstrInfo.td         |  2 ++
 5 files changed, 41 insertions(+), 4 deletions(-)

(limited to 'lib/Target')

diff --git a/lib/Target/Mips/MicroMipsInstrFormats.td b/lib/Target/Mips/MicroMipsInstrFormats.td
index c12a32e3d8..b1c3fb808d 100644
--- a/lib/Target/Mips/MicroMipsInstrFormats.td
+++ b/lib/Target/Mips/MicroMipsInstrFormats.td
@@ -302,3 +302,16 @@ class TEQI_FM_MM<bits<5> funct> : MMArch {
   let Inst{20-16} = rs;
   let Inst{15-0}  = imm16;
 }
+
+class LL_FM_MM<bits<4> funct> {
+  bits<5> rt;
+  bits<21> addr;
+
+  bits<32> Inst;
+
+  let Inst{31-26} = 0x18;
+  let Inst{25-21} = rt;
+  let Inst{20-16} = addr{20-16};
+  let Inst{15-12} = funct;
+  let Inst{11-0}  = addr{11-0};
+}
diff --git a/lib/Target/Mips/MicroMipsInstrInfo.td b/lib/Target/Mips/MicroMipsInstrInfo.td
index 846ced0883..76463892fa 100644
--- a/lib/Target/Mips/MicroMipsInstrInfo.td
+++ b/lib/Target/Mips/MicroMipsInstrInfo.td
@@ -45,6 +45,21 @@ class StoreLeftRightMM<string opstr, SDNode OpNode, RegisterOperand RO,
   let DecoderMethod = "DecodeMemMMImm12";
 }
 
+class LLBaseMM<string opstr, RegisterOperand RO> :
+  InstSE<(outs RO:$rt), (ins mem_mm_12:$addr),
+         !strconcat(opstr, "\t$rt, $addr"), [], NoItinerary, FrmI> {
+  let DecoderMethod = "DecodeMem";
+  let mayLoad = 1;
+}
+
+class SCBaseMM<string opstr, RegisterOperand RO> :
+  InstSE<(outs RO:$dst), (ins RO:$rt, mem_mm_12:$addr),
+         !strconcat(opstr, "\t$rt, $addr"), [], NoItinerary, FrmI> {
+  let DecoderMethod = "DecodeMem";
+  let mayStore = 1;
+  let Constraints = "$rt = $dst";
+}
+
 let DecoderNamespace = "MicroMips", Predicates = [InMicroMips] in {
   /// Arithmetic Instructions (ALU Immediate)
   def ADDiu_MM : MMRel, ArithLogicI<"addiu", simm16, GPR32Opnd>,
@@ -212,4 +227,8 @@ let DecoderNamespace = "MicroMips", Predicates = [InMicroMips] in {
   def TLTI_MM  : MMRel, TEQI_FT<"tlti", GPR32Opnd>, TEQI_FM_MM<0x08>;
   def TLTIU_MM : MMRel, TEQI_FT<"tltiu", GPR32Opnd>, TEQI_FM_MM<0x0a>;
   def TNEI_MM  : MMRel, TEQI_FT<"tnei", GPR32Opnd>, TEQI_FM_MM<0x0c>;
+
+  /// Load-linked, Store-conditional
+  def LL_MM : LLBaseMM<"ll", GPR32Opnd>, LL_FM_MM<0x3>;
+  def SC_MM : SCBaseMM<"sc", GPR32Opnd>, LL_FM_MM<0xb>;
 }
diff --git a/lib/Target/Mips/MipsISelLowering.cpp b/lib/Target/Mips/MipsISelLowering.cpp
index 8f3c264907..9c74ae4ce2 100644
--- a/lib/Target/Mips/MipsISelLowering.cpp
+++ b/lib/Target/Mips/MipsISelLowering.cpp
@@ -392,6 +392,8 @@ MipsTargetLowering(MipsTargetMachine &TM)
   setExceptionSelectorRegister(IsN64 ? Mips::A1_64 : Mips::A1);
 
   MaxStoresPerMemcpy = 16;
+
+  isMicroMips = Subtarget->inMicroMipsMode();
 }
 
 const MipsTargetLowering *MipsTargetLowering::create(MipsTargetMachine &TM) {
@@ -931,8 +933,8 @@ MipsTargetLowering::emitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
   unsigned LL, SC, AND, NOR, ZERO, BEQ;
 
   if (Size == 4) {
-    LL = Mips::LL;
-    SC = Mips::SC;
+    LL = isMicroMips ? Mips::LL_MM : Mips::LL;
+    SC = isMicroMips ? Mips::SC_MM : Mips::SC;
     AND = Mips::AND;
     NOR = Mips::NOR;
     ZERO = Mips::ZERO;
@@ -1174,8 +1176,8 @@ MachineBasicBlock * MipsTargetLowering::emitAtomicCmpSwap(MachineInstr *MI,
   unsigned LL, SC, ZERO, BNE, BEQ;
 
   if (Size == 4) {
-    LL = Mips::LL;
-    SC = Mips::SC;
+    LL = isMicroMips ? Mips::LL_MM : Mips::LL;
+    SC = isMicroMips ? Mips::SC_MM : Mips::SC;
     ZERO = Mips::ZERO;
     BNE = Mips::BNE;
     BEQ = Mips::BEQ;
diff --git a/lib/Target/Mips/MipsISelLowering.h b/lib/Target/Mips/MipsISelLowering.h
index 65f68f0431..2214fd18fe 100644
--- a/lib/Target/Mips/MipsISelLowering.h
+++ b/lib/Target/Mips/MipsISelLowering.h
@@ -209,6 +209,7 @@ namespace llvm {
   class MipsFunctionInfo;
 
   class MipsTargetLowering : public TargetLowering  {
+    bool isMicroMips;
   public:
     explicit MipsTargetLowering(MipsTargetMachine &TM);
 
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index 307e0fb8cc..12bddf0699 100644
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -1012,8 +1012,10 @@ def DI : DEI_FT<"di", GPR32Opnd>, EI_FM<0>;
 def WAIT : WAIT_FT<"wait">;
 
 /// Load-linked, Store-conditional
+let Predicates = [NotInMicroMips] in {
 def LL : LLBase<"ll", GPR32Opnd>, LW_FM<0x30>;
 def SC : SCBase<"sc", GPR32Opnd>, LW_FM<0x38>;
+}
 
 /// Jump and Branch Instructions
 def J       : MMRel, JumpFJ<jmptarget, "j", br, bb, "j">, FJ<2>,
-- 
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