From e403ffc8016999a5288b7ec59447a4d49b7ab3e7 Mon Sep 17 00:00:00 2001
From: Colin LeMahieu <colinl@codeaurora.org>
Date: Fri, 19 Dec 2014 19:06:32 +0000
Subject: [PATCH] [Hexagon] Adding transfers to and from control registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224599 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../Disassembler/HexagonDisassembler.cpp      | 23 ++++++++++
 lib/Target/Hexagon/HexagonInstrInfo.td        | 42 +++++++++++++++++++
 test/MC/Disassembler/Hexagon/cr.txt           |  6 ++-
 3 files changed, 70 insertions(+), 1 deletion(-)

diff --git a/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp b/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
index 26640c5e1f6..31063173aab 100644
--- a/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
+++ b/lib/Target/Hexagon/Disassembler/HexagonDisassembler.cpp
@@ -49,6 +49,9 @@ public:
 };
 }
 
+static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo,
+  uint64_t Address, const void *Decoder);
+
 static const uint16_t IntRegDecoderTable[] = {
   Hexagon::R0, Hexagon::R1, Hexagon::R2, Hexagon::R3, Hexagon::R4,
   Hexagon::R5, Hexagon::R6, Hexagon::R7, Hexagon::R8, Hexagon::R9,
@@ -82,6 +85,26 @@ static DecodeStatus DecodeIntRegsRegisterClass(MCInst &Inst, unsigned RegNo,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus DecodeCtrRegsRegisterClass(MCInst &Inst, unsigned RegNo,
+  uint64_t /*Address*/, const void *Decoder) {
+  static const uint16_t CtrlRegDecoderTable[] = {
+    Hexagon::SA0, Hexagon::LC0, Hexagon::SA1, Hexagon::LC1,
+    Hexagon::P3_0, Hexagon::NoRegister, Hexagon::C6, Hexagon::C7,
+    Hexagon::USR, Hexagon::PC, Hexagon::UGP, Hexagon::GP,
+    Hexagon::CS0, Hexagon::CS1, Hexagon::UPCL, Hexagon::UPCH
+  };
+
+  if (RegNo >= sizeof(CtrlRegDecoderTable) / sizeof(CtrlRegDecoderTable[0]))
+    return MCDisassembler::Fail;
+
+  if (CtrlRegDecoderTable[RegNo] == Hexagon::NoRegister)
+    return MCDisassembler::Fail;
+
+  unsigned Register = CtrlRegDecoderTable[RegNo];
+  Inst.addOperand(MCOperand::CreateReg(Register));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus DecodeDoubleRegsRegisterClass(MCInst &Inst, unsigned RegNo,
   uint64_t /*Address*/, const void *Decoder) {
   static const uint16_t DoubleRegDecoderTable[] = {
diff --git a/lib/Target/Hexagon/HexagonInstrInfo.td b/lib/Target/Hexagon/HexagonInstrInfo.td
index 7ffb3bf3d9b..7f1271b0b6a 100644
--- a/lib/Target/Hexagon/HexagonInstrInfo.td
+++ b/lib/Target/Hexagon/HexagonInstrInfo.td
@@ -3368,6 +3368,48 @@ defm J2_ploop2s : SPLOOP_ri<"2", 0b10>;
 defm J2_ploop3s : SPLOOP_ri<"3", 0b11>;
 }
 
+// Transfer to/from Control/GPR Guest/GPR
+let hasSideEffects = 0 in
+class TFR_CR_RS_base<RegisterClass CTRC, RegisterClass RC, bit isDouble>
+  : CRInst <(outs CTRC:$dst), (ins RC:$src),
+  "$dst = $src", [], "", CR_tc_3x_SLOT3> {
+    bits<5> dst;
+    bits<5> src;
+
+    let IClass = 0b0110;
+
+    let Inst{27-25} = 0b001;
+    let Inst{24} = isDouble;
+    let Inst{23-21} = 0b001;
+    let Inst{20-16} = src;
+    let Inst{4-0} = dst;
+  }
+let isCodeGenOnly = 0 in
+def A2_tfrrcr : TFR_CR_RS_base<CtrRegs, IntRegs, 0b0>;
+def : InstAlias<"m0 = $Rs", (A2_tfrrcr C6, IntRegs:$Rs)>;
+def : InstAlias<"m1 = $Rs", (A2_tfrrcr C7, IntRegs:$Rs)>;
+
+let hasSideEffects = 0 in
+class TFR_RD_CR_base<RegisterClass RC, RegisterClass CTRC, bit isSingle>
+  : CRInst <(outs RC:$dst), (ins CTRC:$src),
+  "$dst = $src", [], "", CR_tc_3x_SLOT3> {
+    bits<5> dst;
+    bits<5> src;
+
+    let IClass = 0b0110;
+
+    let Inst{27-26} = 0b10;
+    let Inst{25} = isSingle;
+    let Inst{24-21} = 0b0000;
+    let Inst{20-16} = src;
+    let Inst{4-0} = dst;
+  }
+
+let hasNewValue = 1, opNewValue = 0, isCodeGenOnly = 0 in
+def A2_tfrcrr : TFR_RD_CR_base<IntRegs, CtrRegs, 1>;
+def : InstAlias<"$Rd = m0", (A2_tfrcrr IntRegs:$Rd, C6)>;
+def : InstAlias<"$Rd = m1", (A2_tfrcrr IntRegs:$Rd, C7)>;
+
 // TFRI64 - assembly mapped.
 let isReMaterializable = 1 in
 def TFRI64 : ALU64_rr<(outs DoubleRegs:$dst), (ins s8Imm64:$src1),
diff --git a/test/MC/Disassembler/Hexagon/cr.txt b/test/MC/Disassembler/Hexagon/cr.txt
index b16a7e0fcc0..e72ec9f6d62 100644
--- a/test/MC/Disassembler/Hexagon/cr.txt
+++ b/test/MC/Disassembler/Hexagon/cr.txt
@@ -35,4 +35,8 @@
 0x01 0xc0 0xc2 0x6b
 # CHECK: p1 = not(p2)
 0x01 0xc2 0x43 0x6b
-# CHECK: p1 = xor(p3, p2)
\ No newline at end of file
+# CHECK: p1 = xor(p3, p2)
+0x0d 0xc0 0x35 0x62
+# CHECK: cs1 = r21
+0x11 0xc0 0x0d 0x6a
+# CHECK: r17 = cs1
-- 
2.34.1