[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, 13 insertions, 1 deletions

diff --git a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp
index f8f8998a543..bda771452f3 100644
--- a/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp
+++ b/llvm/lib/Target/SystemZ/MCTargetDesc/SystemZMCCodeEmitter.cpp
@@ -49,7 +49,7 @@ private:
                              SmallVectorImpl<MCFixup> &Fixups) const;
 
   // Called by the TableGen code to get the binary encoding of an address.
-  // The index, if any, is encoded first, followed by the base,
+  // The index or length, if any, is encoded first, followed by the base,
   // followed by the displacement.  In a 20-bit displacement,
   // the low 12 bits are encoded before the high 8 bits.
   uint64_t getBDAddr12Encoding(const MCInst &MI, unsigned OpNum,
@@ -60,6 +60,8 @@ private:
                                 SmallVectorImpl<MCFixup> &Fixups) const;
   uint64_t getBDXAddr20Encoding(const MCInst &MI, unsigned OpNum,
                                 SmallVectorImpl<MCFixup> &Fixups) const;
+  uint64_t getBDLAddr12Len8Encoding(const MCInst &MI, unsigned OpNum,
+                                    SmallVectorImpl<MCFixup> &Fixups) const;
 
   // Operand OpNum of MI needs a PC-relative fixup of kind Kind at
   // Offset bytes from the start of MI.  Add the fixup to Fixups
@@ -157,6 +159,16 @@ getBDXAddr20Encoding(const MCInst &MI, unsigned OpNum,
     | ((Disp & 0xff000) >> 12);
 }
 
+uint64_t SystemZMCCodeEmitter::
+getBDLAddr12Len8Encoding(const MCInst &MI, unsigned OpNum,
+                         SmallVectorImpl<MCFixup> &Fixups) const {
+  uint64_t Base = getMachineOpValue(MI, MI.getOperand(OpNum), Fixups);
+  uint64_t Disp = getMachineOpValue(MI, MI.getOperand(OpNum + 1), Fixups);
+  uint64_t Len  = getMachineOpValue(MI, MI.getOperand(OpNum + 2), Fixups) - 1;
+  assert(isUInt<4>(Base) && isUInt<12>(Disp) && isUInt<8>(Len));
+  return (Len << 16) | (Base << 12) | Disp;
+}
+
 uint64_t
 SystemZMCCodeEmitter::getPCRelEncoding(const MCInst &MI, unsigned OpNum,
                                        SmallVectorImpl<MCFixup> &Fixups,