From: Hermès Bélusca-Maïto <hermes.belusca-maito@reactos.org>
Date: Sun, 12 Oct 2014 14:08:14 +0000 (+0000)
Subject: [FAST486]: speed up things a bit when we're reading prefixes, by really going to... 
X-Git-Tag: backups/0.3.17@66124~58
X-Git-Url: https://git.reactos.org/?p=reactos.git;a=commitdiff_plain;h=eebf53a4a1453e1c7b648e572243b6d69759798e;hp=62a9101a31f711f3372687cfc0792e8896bf8c22

[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).

svn path=/trunk/; revision=64698
---

diff --git a/reactos/lib/fast486/fast486.c b/reactos/lib/fast486/fast486.c
index 195881dae83..51960b7b30f 100644
--- a/reactos/lib/fast486/fast486.c
+++ b/reactos/lib/fast486/fast486.c
@@ -54,6 +54,7 @@ Fast486ExecutionControl(PFAST486_STATE State, FAST486_EXEC_CMD Command)
     /* Main execution loop */
     do
     {
+NextInst:
         /* Check if this is a new instruction */
         if (State->PrefixFlags == 0) State->SavedInstPtr = State->InstPtr;
 
@@ -72,7 +73,7 @@ Fast486ExecutionControl(PFAST486_STATE State, FAST486_EXEC_CMD Command)
         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 @@ Fast486ExecutionControl(PFAST486_STATE State, FAST486_EXEC_CMD Command)
             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));
 }