From e7ce79fc05c22d4405a0d81d2948b000d10431be Mon Sep 17 00:00:00 2001
From: Aleksandar Andrejevic <aandrejevic@reactos.org>
Date: Sun, 23 Jun 2013 00:20:24 +0000
Subject: [PATCH] [NTVDM] Perform multiple CPU instructions in one emulator
 cycle.

svn path=/branches/ntvdm/; revision=59298
---
 subsystems/ntvdm/ntvdm.c | 4 ++--
 subsystems/ntvdm/ntvdm.h | 1 +
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/subsystems/ntvdm/ntvdm.c b/subsystems/ntvdm/ntvdm.c
index 957a9aa4b67..70ae2dc8b4a 100644
--- a/subsystems/ntvdm/ntvdm.c
+++ b/subsystems/ntvdm/ntvdm.c
@@ -156,9 +156,9 @@ INT wmain(INT argc, WCHAR *argv[])
         }
         
         /* Continue CPU emulation */
-        EmulatorStep();
+        for (i = 0; i < STEPS_PER_CYCLE; i++) EmulatorStep();
         
-        Cycles++;
+        Cycles += STEPS_PER_CYCLE;
         if ((CurrentTickCount - LastCyclePrintout) >= 1000)
         {
             DPRINT1("NTVDM: %d Instructions Per Second\n", Cycles);
diff --git a/subsystems/ntvdm/ntvdm.h b/subsystems/ntvdm/ntvdm.h
index ddc4ac5bee5..896ce7a4ecf 100644
--- a/subsystems/ntvdm/ntvdm.h
+++ b/subsystems/ntvdm/ntvdm.h
@@ -32,6 +32,7 @@
 #define SPECIAL_INT_NUM 0xFF
 #define SEGMENT_TO_MCB(seg) ((PDOS_MCB)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), 0)))
 #define SEGMENT_TO_PSP(seg) ((PDOS_PSP)((ULONG_PTR)BaseAddress + TO_LINEAR((seg), 0)))
+#define STEPS_PER_CYCLE 256
 
 /* DOS constants */
 #define DOS_VERSION 0x0600