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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.
| i386-Options: | Options | |
| i386-Directives: | X86 specific directives | |
| i386-Syntax: | Syntactical considerations | |
| i386-Mnemonics: | Instruction Naming | |
| i386-Regs: | Register Naming | |
| i386-Prefixes: | Instruction Prefixes | |
| i386-Memory: | Memory References | |
| i386-Jumps: | Handling of Jump Instructions | |
| i386-Float: | Floating Point | |
| i386-SIMD: | Intels MMX and AMDs 3DNow! SIMD Operations | |
| i386-LWP: | AMDs Lightweight Profiling Instructions | |
| i386-BMI: | Bit Manipulation Instruction | |
| i386-TBM: | AMDs Trailing Bit Manipulation Instructions | |
| i386-16bit: | Writing 16-bit Code | |
| i386-Arch: | Specifying an x86 CPU architecture | |
| i386-ISA: | AMD64 ISA vs. Intel64 ISA | |
| i386-Bugs: | AT&T Syntax bugs | |
| i386-Notes: | Notes |