MPX: Add MPX instructions

Added MPX instructions and corresponding parser and encoder.

ICC style mib - base + disp and index are separate - is supported.
E.g. bndstx [ebx+3], bnd2, edx -> ebx+3 : base+disp, edx : index

As a supplement to NASM style mib - split EA - parser,
omitted base+disp is now treated as 0 displacement.
E.g. bndstx [,edx], bnd2 -> bndstx [0,edx], bnd2

Signed-off-by: Jin Kyu Song <jin.kyu.song@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/parser.c b/parser.c
index bb56924..0068ca3 100644
--- a/parser.c
+++ b/parser.c
@@ -821,6 +821,13 @@ is_expression:
                 process_size_override(result, op);
                 i = stdscan(NULL, &tokval);
             }
+            /* when a comma follows an opening bracket - [ , eax*4] */
+            if (i == ',') {
+                /* treat as if there is a zero displacement virtually */
+                tokval.t_type = TOKEN_NUM;
+                tokval.t_integer = 0;
+                stdscan_set(stdscan_get() - 1);     /* rewind the comma */
+            }
         } else {                /* immediate operand, or register */
             mref = false;
             bracket = false;    /* placate optimisers */