- 3DNow! instructions have a trailing immediate byte which indicates the
opcode. Decoding this with the existing table structure requires more
effort (in particular, a new lookup table after decoding ModRM would
be required). Given that AMD even removed 3DNow! over 10 years ago, it
appears unlikely that this will ever be fully supported. Adding the
RMI-encoded pseudo-instruction "3DNOW" just to support that opcode.
- FEMMS is a legacy 3DNow! instruction.
- EXTRQ/INSERTQ are instructions with an "unusual" encoding and
operation mode. This is another instance of 16-bit immediates.
- SVM (AMD's variant of VMX) and SNP instructions are AMD-only.
The formatter now includes the following information:
- Segment overrides
- Address-size overrides
- REP/REPNZ prefixes
- LOCK prefix
- High-byte registers (determined using presence of REX prefix)
