[SystemZ] Add the MVC instruction

This is the first use of D(L,B) addressing, which required a fair bit
of surgery.  For that reason, the patch just adds the instruction
definition and the associated assembler and disassembler support.
A later patch will actually make use of it for codegen.

llvm-svn: 185433

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp b/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
index 4e4816badab..79469b6afe2 100644
--- a/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
+++ b/llvm/lib/Target/SystemZ/Disassembler/SystemZDisassembler.cpp
@@ -226,6 +226,18 @@ static DecodeStatus decodeBDXAddr20Operand(MCInst &Inst, uint64_t Field,
   return MCDisassembler::Success;
 }
 
+static DecodeStatus decodeBDLAddr12Len8Operand(MCInst &Inst, uint64_t Field,
+                                               const unsigned *Regs) {
+  uint64_t Length = Field >> 16;
+  uint64_t Base = (Field >> 12) & 0xf;
+  uint64_t Disp = Field & 0xfff;
+  assert(Length < 256 && "Invalid BDLAddr12Len8");
+  Inst.addOperand(MCOperand::CreateReg(Base == 0 ? 0 : Regs[Base]));
+  Inst.addOperand(MCOperand::CreateImm(Disp));
+  Inst.addOperand(MCOperand::CreateImm(Length + 1));
+  return MCDisassembler::Success;
+}
+
 static DecodeStatus decodeBDAddr32Disp12Operand(MCInst &Inst, uint64_t Field,
                                                 uint64_t Address,
                                                 const void *Decoder) {
@@ -262,6 +274,13 @@ static DecodeStatus decodeBDXAddr64Disp20Operand(MCInst &Inst, uint64_t Field,
   return decodeBDXAddr20Operand(Inst, Field, SystemZMC::GR64Regs);
 }
 
+static DecodeStatus decodeBDLAddr64Disp12Len8Operand(MCInst &Inst,
+                                                     uint64_t Field,
+                                                     uint64_t Address,
+                                                     const void *Decoder) {
+  return decodeBDLAddr12Len8Operand(Inst, Field, SystemZMC::GR64Regs);
+}
+
 #include "SystemZGenDisassemblerTables.inc"
 
 DecodeStatus SystemZDisassembler::getInstruction(MCInst &MI, uint64_t &Size,