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kvisc/vm/pc/DECD

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# The OS/K Team licenses this file to you under the MIT license.
# See the LICENSE file in the project root for more information.
Instruction encoding:
15 0 15 0
xxxxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
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│││└───────────┘ │└───┘└───┘└───┘
│││ INSTR. │ FT3 FT2 FT1
│││ │
LMC R
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M No more words
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C COND suffix
L LOCK suffix
R REP suffix
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FT1 First operand format
FT2 Second operand format
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Values for COND:
00000 (none)
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00001 .C .B
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00010 .O
00011 .Z .E
00100 .S
00101 .P
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00110 .BE
00111 .L
01000 .LE
01001 .AXZ
01010 .BXZ
01011 .CXZ
01100 .DXZ
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Highest (6th) bit of COND indicates negation
Fx values:
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00000 (none)
00001 reg
00010 imm64
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xxx00 [imm64]
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xxx01 [reg+reg] code(reg)|code(reg)
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xxx10 [reg+reg+imm16] code(reg)|code(reg) imm16
xxx11 [reg+reg*imm16+imm16] code(reg)|code(reg) imm16 imm16
Where xxx is:
001 8-bit access
010 16-bit access
011 32-bit access
100 64-bit access