From 0c66403efdf88ff4f247b6a9f45339bb3a893235 Mon Sep 17 00:00:00 2001
From: Akira Hatanaka <ahatanaka@mips.com>
Date: Thu, 7 Feb 2013 19:48:00 +0000
Subject: [PATCH] [mips] Add definition of JALR instruction which has two
 register operands. Change the original JALR instruction with one register
 operand to be a pseudo-instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174657 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Mips/Mips64InstrInfo.td    |  3 +++
 lib/Target/Mips/MipsInstrFormats.td   |  3 ++-
 lib/Target/Mips/MipsInstrInfo.td      | 11 +++++++++--
 test/MC/Mips/mips-jump-instructions.s |  8 ++++++++
 4 files changed, 22 insertions(+), 3 deletions(-)

diff --git a/lib/Target/Mips/Mips64InstrInfo.td b/lib/Target/Mips/Mips64InstrInfo.td
index db92c64c053..494ba87b401 100644
--- a/lib/Target/Mips/Mips64InstrInfo.td
+++ b/lib/Target/Mips/Mips64InstrInfo.td
@@ -170,6 +170,7 @@ def BLTZ64 : CBranchZero<"bltz", setlt, CPU64Regs>, BGEZ_FM<1, 0>;
 }
 let DecoderNamespace = "Mips64" in
 def JALR64 : JumpLinkReg<"jalr", CPU64Regs>, JALR_FM;
+def JALR64Pseudo : JumpLinkRegPseudo<CPU64Regs, JALR64, RA_64>;
 def TAILCALL64_R : JumpFR<CPU64Regs, MipsTailCall>, MTLO_FM<8>, IsTailCall;
 
 let DecoderNamespace = "Mips64" in {
@@ -329,6 +330,8 @@ def : InstAlias<"not $rt, $rs",
                 (NOR64 CPU64RegsOpnd:$rt, CPU64RegsOpnd:$rs, ZERO_64), 1>,
       Requires<[HasMips64]>;
 def : InstAlias<"j $rs", (JR64 CPU64Regs:$rs), 0>, Requires<[HasMips64]>;
+def : InstAlias<"jalr $rs", (JALR64 RA_64, CPU64Regs:$rs)>,
+      Requires<[HasMips64]>;
 def : InstAlias<"daddu $rs, $rt, $imm",
                 (DADDiu CPU64RegsOpnd:$rs, CPU64RegsOpnd:$rt, simm16_64:$imm),
                 1>;
diff --git a/lib/Target/Mips/MipsInstrFormats.td b/lib/Target/Mips/MipsInstrFormats.td
index 6977e452646..ee432c87535 100644
--- a/lib/Target/Mips/MipsInstrFormats.td
+++ b/lib/Target/Mips/MipsInstrFormats.td
@@ -367,6 +367,7 @@ class LUI_FM {
 }
 
 class JALR_FM {
+  bits<5> rd;
   bits<5> rs;
 
   bits<32> Inst;
@@ -374,7 +375,7 @@ class JALR_FM {
   let Inst{31-26} = 0;
   let Inst{25-21} = rs;
   let Inst{20-16} = 0;
-  let Inst{15-11} = 31;
+  let Inst{15-11} = rd;
   let Inst{10-6}  = 0;
   let Inst{5-0}   = 9;
 }
diff --git a/lib/Target/Mips/MipsInstrInfo.td b/lib/Target/Mips/MipsInstrInfo.td
index 7e33cb18468..c85b547d0ec 100644
--- a/lib/Target/Mips/MipsInstrInfo.td
+++ b/lib/Target/Mips/MipsInstrInfo.td
@@ -565,9 +565,14 @@ let isCall=1, hasDelaySlot=1, Defs = [RA] in {
     let DecoderMethod = "DecodeJumpTarget";
   }
 
+  class JumpLinkRegPseudo<RegisterClass RC, Instruction JALRInst,
+                          Register RetReg>:
+    PseudoSE<(outs), (ins RC:$rs), [(MipsJmpLink RC:$rs)], IIBranch>,
+    PseudoInstExpansion<(JALRInst RetReg, RC:$rs)>;
+
   class JumpLinkReg<string opstr, RegisterClass RC>:
-    InstSE<(outs), (ins RC:$rs), !strconcat(opstr, "\t$rs"),
-           [(MipsJmpLink RC:$rs)], IIBranch, FrmR>;
+    InstSE<(outs RC:$rd), (ins RC:$rs), !strconcat(opstr, "\t$rd, $rs"),
+           [], IIBranch, FrmR>;
 
   class BGEZAL_FT<string opstr, RegisterOperand RO> :
     InstSE<(outs), (ins RO:$rs, brtarget:$offset),
@@ -865,6 +870,7 @@ def BAL_BR: BAL_FT, BAL_FM;
 
 def JAL  : JumpLink<"jal">, FJ<3>;
 def JALR : JumpLinkReg<"jalr", CPURegs>, JALR_FM;
+def JALRPseudo : JumpLinkRegPseudo<CPURegs, JALR, RA>;
 def BGEZAL : BGEZAL_FT<"bgezal", CPURegsOpnd>, BGEZAL_FM<0x11>;
 def BLTZAL : BGEZAL_FT<"bltzal", CPURegsOpnd>, BGEZAL_FM<0x10>;
 def TAILCALL : JumpFJ<calltarget, "j", MipsTailCall, imm>, FJ<2>, IsTailCall;
@@ -972,6 +978,7 @@ def : InstAlias<"and $rs, $rt, $imm",
                 (ANDi CPURegsOpnd:$rs, CPURegsOpnd:$rt, simm16:$imm), 0>;
 def : InstAlias<"j $rs", (JR CPURegs:$rs), 0>,
       Requires<[NotMips64]>;
+def : InstAlias<"jalr $rs", (JALR RA, CPURegs:$rs)>, Requires<[NotMips64]>;
 def : InstAlias<"not $rt, $rs",
                 (NOR CPURegsOpnd:$rt, CPURegsOpnd:$rs, ZERO), 1>;
 def : InstAlias<"neg $rt, $rs",
diff --git a/test/MC/Mips/mips-jump-instructions.s b/test/MC/Mips/mips-jump-instructions.s
index 58250f306e8..bc2d7203981 100644
--- a/test/MC/Mips/mips-jump-instructions.s
+++ b/test/MC/Mips/mips-jump-instructions.s
@@ -56,6 +56,10 @@ end_of_code:
 # CHECK:   nop                  # encoding: [0x00,0x00,0x00,0x00]
 # CHECK:   jalr $6              # encoding: [0x09,0xf8,0xc0,0x00]
 # CHECK:   nop                  # encoding: [0x00,0x00,0x00,0x00]
+# CHECK:   jalr $25             # encoding: [0x09,0xf8,0x20,0x03]
+# CHECK:   nop                  # encoding: [0x00,0x00,0x00,0x00]
+# CHECK:   jalr $10, $11        # encoding: [0x09,0x50,0x60,0x01]
+# CHECK:   nop                  # encoding: [0x00,0x00,0x00,0x00]
 # CHECK:   jr $7                # encoding: [0x08,0x00,0xe0,0x00]
 # CHECK:   nop                  # encoding: [0x00,0x00,0x00,0x00]
 # CHECK:   jr $7                # encoding: [0x08,0x00,0xe0,0x00]
@@ -67,6 +71,10 @@ end_of_code:
    nop
    jalr $6
    nop
+   jalr $31, $25
+   nop
+   jalr $10, $11
+   nop
    jr $7
    nop
    j $7