---

9.16 80386 Dependent Features

The i386 version as supports both the original Intel 386 architecture in both 16 and 32-bit mode as well as AMD x86-64 architecture extending the Intel architecture to 64-bits.

• Options
• x86 specific Directives
• i386 Syntactical Considerations
• i386-Mnemonics
• Register Naming
• Instruction Prefixes
• Memory References
• Handling of Jump Instructions
• Floating Point
• Intel’s MMX and AMD’s 3DNow! SIMD Operations
• AMD’s Lightweight Profiling Instructions
• Bit Manipulation Instructions
• AMD’s Trailing Bit Manipulation Instructions
• Writing 16-bit Code
• Specifying CPU Architecture
• AMD64 ISA vs. Intel64 ISA
• AT&T Syntax bugs
• Notes