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instrs: Fix decoding of XCHG r8, rax

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Opcode 90 is only a NOP if there is no REX.B.
This commit is contained in:
Alexis Engelke
2020-06-14 13:34:47 +02:00
parent c3df15e19b
commit 80ec7ed960
3 changed files with 21 additions and 1 deletions
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4
instrs.txt
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@@ -143,7 +143,9 @@
8d RM GP GP - - LEA MUSTMEM
8e RM SREG GP - - MOV_G2S
8f/0 M GP - - - POP DEF64
90 NP - - - - NOP
# Against frequent belief, only, XCHG (r/e)AX, (r)AX with 90 is NOP.
# As a lacking REX.B cannot be specified here, this is hardcoded.
90 OA GP GP - - XCHG_NOP
91 OA GP GP - - XCHG
92 OA GP GP - - XCHG
93 OA GP GP - - XCHG