[ARM] Add MVE 64-bit GPR <-> vector move instructions.

These instructions let you load half a vector register at once from
two general-purpose registers, or vice versa.

The assembly syntax for these instructions mentions the vector
register name twice. For the move _into_ a vector register, the MC
operand list also has to mention the register name twice (once as the
output, and once as an input to represent where the unchanged half of
the output register comes from). So we can conveniently assign one of
the two asm operands to be the output $Qd, and the other $QdSrc, which
avoids confusing the auto-generated AsmMatcher too much. For the move
_from_ a vector register, there's no way to get round the fact that
both instances of that register name have to be inputs, so we need a
custom AsmMatchConverter to avoid generating two separate output MC
operands. (And even that wouldn't have worked if it hadn't been for
D60695.)

Reviewers: dmgreen, samparker, SjoerdMeijer, t.p.northover

Subscribers: javed.absar, kristof.beyls, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D62679

llvm-svn: 364041

1 files changed, 69 insertions, 0 deletions

diff --git a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
index a466536c3f2..fd99704af2b 100644
--- a/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
+++ b/llvm/lib/Target/ARM/Disassembler/ARMDisassembler.cpp
@@ -513,6 +513,16 @@ template <int shift>
 static DecodeStatus DecodeExpandedImmOperand(MCInst &Inst, unsigned Val,
                                              uint64_t Address,
                                              const void *Decoder);
+template<unsigned start>
+static DecodeStatus DecodeMVEPairVectorIndexOperand(MCInst &Inst, unsigned Val,
+                                                    uint64_t Address,
+                                                    const void *Decoder);
+static DecodeStatus DecodeMVEVMOVQtoDReg(MCInst &Inst, unsigned Insn,
+                                         uint64_t Address,
+                                         const void *Decoder);
+static DecodeStatus DecodeMVEVMOVDRegtoQ(MCInst &Inst, unsigned Insn,
+                                         uint64_t Address,
+                                         const void *Decoder);
 static DecodeStatus DecodeMVEVCVTt1fp(MCInst &Inst, unsigned Insn,
                                       uint64_t Address, const void *Decoder);
 typedef DecodeStatus OperandDecoder(MCInst &Inst, unsigned Val,
@@ -6152,6 +6162,65 @@ static DecodeStatus DecodeExpandedImmOperand(MCInst &Inst, unsigned Val,
     return MCDisassembler::Success;
 }
 
+template<unsigned start>
+static DecodeStatus DecodeMVEPairVectorIndexOperand(MCInst &Inst, unsigned Val,
+                                                    uint64_t Address,
+                                                    const void *Decoder) {
+  DecodeStatus S = MCDisassembler::Success;
+
+  Inst.addOperand(MCOperand::createImm(start + Val));
+
+  return S;
+}
+
+static DecodeStatus DecodeMVEVMOVQtoDReg(MCInst &Inst, unsigned Insn,
+                                         uint64_t Address, const void *Decoder) {
+  DecodeStatus S = MCDisassembler::Success;
+  unsigned Rt = fieldFromInstruction(Insn, 0, 4);
+  unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
+  unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
+                 fieldFromInstruction(Insn, 13, 3));
+  unsigned index = fieldFromInstruction(Insn, 4, 1);
+
+  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeMVEPairVectorIndexOperand<2>(Inst, index, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeMVEPairVectorIndexOperand<0>(Inst, index, Address, Decoder)))
+    return MCDisassembler::Fail;
+
+  return S;
+}
+
+static DecodeStatus DecodeMVEVMOVDRegtoQ(MCInst &Inst, unsigned Insn,
+                                         uint64_t Address, const void *Decoder) {
+  DecodeStatus S = MCDisassembler::Success;
+  unsigned Rt = fieldFromInstruction(Insn, 0, 4);
+  unsigned Rt2 = fieldFromInstruction(Insn, 16, 4);
+  unsigned Qd = ((fieldFromInstruction(Insn, 22, 1) << 3) |
+                 fieldFromInstruction(Insn, 13, 3));
+  unsigned index = fieldFromInstruction(Insn, 4, 1);
+
+  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeMQPRRegisterClass(Inst, Qd, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeGPRRegisterClass(Inst, Rt2, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeMVEPairVectorIndexOperand<2>(Inst, index, Address, Decoder)))
+    return MCDisassembler::Fail;
+  if (!Check(S, DecodeMVEPairVectorIndexOperand<0>(Inst, index, Address, Decoder)))
+    return MCDisassembler::Fail;
+
+  return S;
+}
+
 static DecodeStatus DecodeMVEOverlappingLongShift(
   MCInst &Inst, unsigned Insn, uint64_t Address, const void *Decoder) {
   DecodeStatus S = MCDisassembler::Success;