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2 Commits

Author SHA1 Message Date
H. Peter Anvin
2469b8b66e Add {rex} prefix, simplify prefix handling, better error messages 
Add a {rex} prefix to force REX encoding (typically a redundant 40h
prefix).

For prefix parsing, we can use t_inttwo to encode the prefix slot
number.

Give more verbose error messages for encoding mismatches.
 2021-04-27 11:37:42 -07:00
H. Peter Anvin
621a69ac5c Add {vex3} and {vex2} prefixes by analogy with {evex} 
Allow specifying {vex3} or {vex2} (the latter is currently always
redundant, unless we end up with instructions at some point can be
specified with legacy prefixes or VEX) to select a specific encoding
of VEX-encoded instructions.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
 2013-11-28 12:21:11 -08:00