Author: aandrejevic
Date: Wed Nov 13 13:32:00 2013
New Revision: 60972
URL: http://svn.reactos.org/svn/reactos?rev=60972&view=rev
Log:
[FAST486]
Fix a bug in the ROL and ROR instructions.
Modified:
branches/ntvdm/lib/fast486/opgroups.c
Modified: branches/ntvdm/lib/fast486/opgroups.c
URL:
http://svn.reactos.org/svn/reactos/branches/ntvdm/lib/fast486/opgroups.c?rev=60972&r1=60971&r2=60972&view=diff
==============================================================================
--- branches/ntvdm/lib/fast486/opgroups.c [iso-8859-1] (original)
+++ branches/ntvdm/lib/fast486/opgroups.c [iso-8859-1] Wed Nov 13
13:32:00 2013
@@ -167,8 +167,7 @@
/* Normalize the count */
Count &= 0x1F;
- if (Operation <= 1) Count %= Bits;
- else if (Operation <= 3) Count %= Bits + 1;
+ if ((Operation == 2) || (Operation == 3)) Count %= Bits + 1;
/* If the count is zero, do nothing */
if (Count == 0) return Value;
@@ -179,6 +178,7 @@
/* ROL */
case 0:
{
+ Count %= Bits;
Result = (Value << Count) | (Value >> (Bits - Count));
/* Update CF and OF */
@@ -192,6 +192,7 @@
/* ROR */
case 1:
{
+ Count %= Bits;
Result = (Value >> Count) | (Value << (Bits - Count));
/* Update CF and OF */
