[X86] AVX512: Add disassembler support for compressed displacement

There are two parts here.  First is to modify tablegen to adjust the encoding
type ENCODING_RM with the scaling factor.

The second is to use the new encoding types to compute the correct
displacement in the decoder.

Fixes <rdar://problem/17608489>

llvm-svn: 213281

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/utils/TableGen/X86RecognizableInstr.h b/llvm/utils/TableGen/X86RecognizableInstr.h
index 77286bc4336..4bc52ebd849 100644
--- a/llvm/utils/TableGen/X86RecognizableInstr.h
+++ b/llvm/utils/TableGen/X86RecognizableInstr.h
@@ -78,6 +78,8 @@ private:
   bool IsCodeGenOnly;
   /// The ForceDisassemble field from the record
   bool ForceDisassemble;
+  // The CD8_Scale field from the record
+  uint8_t CD8_Scale;
   // Whether the instruction has the predicate "In64BitMode"
   bool Is64Bit;
   // Whether the instruction has the predicate "In32BitMode"
@@ -153,6 +155,9 @@ private:
   static OperandEncoding writemaskRegisterEncodingFromString(const std::string &s,
                                                              uint8_t OpSize);
 
+  /// \brief Adjust the encoding type for an operand based on the instruction.
+  void adjustOperandEncoding(OperandEncoding &encoding);
+
   /// handleOperand - Converts a single operand from the LLVM table format to
   ///   the emitted table format, handling any duplicate operands it encounters
   ///   and then one non-duplicate.