[hbelusca] 64698: [FAST486]: speed up things a bit when we're reading prefixes, by really going to the next instruction (no jump to the end of the do{}while() loop, then restart).

Author: hbelusca
Date: Sun Oct 12 14:08:14 2014
New Revision: 64698

URL: http://svn.reactos.org/svn/reactos?rev=64698&view=rev
Log:
[FAST486]: speed up things a bit when we're reading prefixes, by really going to the next instruction (no jump to the end of the do{}while() loop, then restart).

Modified:
    trunk/reactos/lib/fast486/fast486.c

Modified: trunk/reactos/lib/fast486/fast486.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/fast486/fast486.c?rev=6...
==============================================================================
--- trunk/reactos/lib/fast486/fast486.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/fast486/fast486.c	[iso-8859-1] Sun Oct 12 14:08:14 2014
@@ -54,6 +54,7 @@
     /* Main execution loop */
     do
     {
+NextInst:
         /* Check if this is a new instruction */
         if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;

@@ -72,7 +73,7 @@
         CurrentHandler(State, Opcode);

/* If this is a prefix, go to the next instruction immediately */
-        if (CurrentHandler == Fast486OpcodePrefix) continue;
+        if (CurrentHandler == Fast486OpcodePrefix) goto NextInst;

/* A non-prefix opcode has been executed, reset the prefix flags */
         State->PrefixFlags = 0;
@@ -104,8 +105,7 @@
             State->IntStatus = FAST486_INT_EXECUTE;
         }
     }
-    while ((CurrentHandler == Fast486OpcodePrefix) ||
-           (Command == FAST486_CONTINUE) ||
+    while ((Command == FAST486_CONTINUE) ||
            (Command == FAST486_STEP_OVER && ProcedureCallCount > 0) ||
            (Command == FAST486_STEP_OUT && ProcedureCallCount >= 0));
 }