insns.pl: add "nohi" code for REX_NH

Add a "nohi" code flag for the \325 byte code, which sets the REX_NH
flag.  That is, REX_P not required to support high registers, high
registers are not supported and spl/bpl/sil/dil enabled even in
non-64-bit mode.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/insns.pl b/insns.pl
index 4c3bf5e7..c756f99d 100755
--- a/insns.pl
+++ b/insns.pl
@@ -666,6 +666,8 @@ sub byte_code_compile($$) {
 	    push(@codes, 0334);
 	} elsif ($op eq 'repe') {
 	    push(@codes, 0335);
+	} elsif ($op eq 'nohi') { # Use spl/bpl/sil/dil even without REX
+	    push(@codes, 0325);
 	} elsif ($prefix_ok && $op =~ /^(66|f2|f3|np)$/) {
 	    # 66/F2/F3 prefix used as an opcode extension, or np = no prefix
 	    if ($op eq '66') {