From eb9e0938403b63e6478d6d874285a39e9984dbda Mon Sep 17 00:00:00 2001
From: "H. Peter Anvin" <hpa@zytor.com>
Date: Wed, 21 May 2008 10:34:33 -0700
Subject: [PATCH] Fix skipping 0270 code when searching for disasm prefixes

The 0270 code was incorrectly entered as 270 (decimal), which meant
that instructions with vex but no .nds got misfiled in the improper
opcode tables.
---
 insns.pl | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/insns.pl b/insns.pl
index 81997320..bbb17021 100644
--- a/insns.pl
+++ b/insns.pl
@@ -406,6 +406,8 @@ sub hexstr(@) {
 # \1[0123]     mean byte plus register value
 # \330         means byte plus condition code
 # \0 or \340   mean give up and return empty set
+# \17[234]     skip is4 control byte
+# \26x \270    skip VEX control bytes
 sub startseq($) {
   my ($codestr) = @_;
   my $word, @range;
@@ -461,11 +463,11 @@ sub startseq($) {
 	  return addprefix($prefix, $c1..($c1+15));
       } elsif ($c0 == 0 || $c0 == 0340) {
 	  return $prefix;
-      } elsif (($c0 & ~3) == 0260 || $c0 == 270) {
-	  shift(@codes);
-	  shift(@codes);
-      } elsif ($c0 == 0172) {
+      } elsif (($c0 & ~3) == 0260 || $c0 == 0270) {
+	  shift(@codes);	# Skip VEX control bytes
 	  shift(@codes);
+      } elsif ($c0 >= 0172 && $c0 <= 174) {
+	  shift(@codes);	# Skip is4 control byte
       } else {
 	  # We really need to be able to distinguish "forbidden"
 	  # and "ignorable" codes here
-- 
2.11.4.GIT