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X86-64 Instruction Encoding: Difference between revisions
→Registers
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== Registers ==
The registers are encoded using the 4-bit values in the X.Reg column of the following table.
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! X.Reg!! 8-bit GP!! 16-bit GP!! 32-bit GP!! 64-bit GP!! 80-bit x87!! 64-bit MMX!! 128-bit XMM!! 256-bit YMM!! 16-bit Segment!! 32-bit Control!! 32-bit Debug
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| b0.101 (5)||CH, BPL<span style="vertical-align: super">[[#Table1Note1|1]]</span>||BP||EBP||RBP||FPR5||MMX5||XMM5||YMM5||GS||CR5||DR5
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| b0.110 (6)||DH, SIL<span style="vertical-align: super">[[#Table1Note1|1]]</span>||SI||ESI||RSI||FPR6||MMX6||XMM6||YMM6||
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| b0.111 (7)||BH, DIL<span style="vertical-align: super">[[#Table1Note1|1]]</span>||DI||EDI||RDI||FPR7||MMX7||XMM7||YMM7||
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| b1.000 (8)||R8L||R8W||R8D||R8||
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| b1.001 (9)||R9L||R9W||R9D||R9||
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| b1.010 (10)||R10L||R10W||R10D||R10||
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| b1.011 (11)||R11L||R11W||R11D||R11||
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| b1.100 (12)||R12L||R12W||R12D||R12||
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| b1.101 (13)||R13L||R13W||R13D||R13||
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| b1.110 (14)||R14L||R14W||R14D||R14||
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| b1.111 (15)||R15L||R15W||R15D||R15||
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<small id="Table1Note1">1: When any REX prefix is used, SPL, BPL, SIL and DIL are used. Otherwise, without any REX prefix AH, CH, DH and BH are used.</small>
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