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RDRAND <> SENDUIPI
RDSEED <> RDPID
VMCALL <> VMGEXIT
WRSSD/WRSSQ <> ADCX/ADOX
RDPKRU/WRPKRU <> CLUI/STUI
BNDLDX/BNDSTX <> BNDMOV

 RDRAND <> SENDUIPI
 RDSEED <> RDPID
 VMCALL <> VMGEXIT
 WRSSD/WRSSQ   <> ADCX/ADOX
 RDPKRU/WRPKRU <> CLUI/STUI
 BNDLDX/BNDSTX <> BNDMOV
@yjh-styx
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2 Peter Anvin:
According to your comment on PR#147, there won't be any actual collisions in the disassembler due to the selection of commands with a minimal number of prefixes. However... perhaps you'll find these references (or some of them) useful to include. :)

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hpax commented Oct 17, 2025

It is better, though, to be explicit... if nothing else because otherwise strange things can happen when and if code is moved around.

@yjh-styx
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It seems to me that if the constraints are explicitly set,
no permutations will have any effect unless the "paired" command disappears.

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2 participants