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>

1 files changed, 3 insertions, 1 deletions

diff --git a/nasm.h b/nasm.h
index 87e82d26..f499c49a 100644
--- a/nasm.h
+++ b/nasm.h
@@ -565,6 +565,8 @@ enum prefixes { /* instruction prefixes */
     P_XRELEASE,
     P_BND,
     P_EVEX,
+    P_VEX3,
+    P_VEX2,
     PREFIX_ENUM_LIMIT
 };
 
@@ -647,7 +649,7 @@ enum prefix_pos {
     PPS_SEG,    /* Segment override prefix */
     PPS_OSIZE,  /* Operand size prefix */
     PPS_ASIZE,  /* Address size prefix */
-    PPS_EVEX,   /* EVEX prefix */
+    PPS_VEX,    /* VEX type */
     MAXPREFIX   /* Total number of prefix slots */
 };