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x86/insns.dat: add "UDW" as a (likely temporary) mnemonic for FF FF

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sandpile.org are referring to FF FF as "UDW" for the FF FF subcase of
FF /7. Accept that mnemonic; allow it in disassembly as well until
such time as an official mnemonic exists for this pseudo-instruction
(or the opcode ends up being actually used, which would almost
certainly be a very bad thing.)

Fixes: https://github.com/netwide-assembler/nasm/issues/249
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin (Intel) 2026-06-26 14:29:00 -07:00
parent a55b5930b3
commit 3f269f2dc8
1 changed files with 3 additions and 0 deletions
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x86/insns.dat
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@ -951,6 +951,9 @@ $wdq UD2 reg#,rm# [rm: o# 0f 0b /r] 186,ND,SM
$wdq UD2A reg#,rm# [rm: o# 0f 0b /r] 186,ND
; UDB: 64-bit mode only, single byte
UDB void [ d6] X86_64,LONG
; sandpile.org calls this UDW. Accept it as such. When (and if) a formal mnemonic
; is allocated, this will take precendence in disassembly, of course.
UDW void [ ff ff] 186,UNDOC
FWAIT void [ wait] 8086