[aandrejevic] 65946: [FAST486] Fix a bug in UnsignedDivMod128.

Author: aandrejevic
Date: Sat Jan  3 03:52:50 2015
New Revision: 65946

URL: http://svn.reactos.org/svn/reactos?rev=65946&view=rev
Log:
[FAST486]
Fix a bug in UnsignedDivMod128.

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

Modified: trunk/reactos/lib/fast486/fpu.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/fast486/fpu.c?rev=65946...
==============================================================================
--- trunk/reactos/lib/fast486/fpu.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/fast486/fpu.c	[iso-8859-1] Sat Jan  3 03:52:50 2015
@@ -84,12 +84,14 @@
     /* Initialize the quotient */
     *QuotientLow = *QuotientHigh = 0ULL;

+    /* Exit early if the dividend is lower than the divisor */
+    if ((DividendHigh == 0ULL) && (DividendLow < Divisor)) return ValueLow;
+
     /* Normalize the current divisor */
     Bits = CountLeadingZeros64(CurrentHigh);
     CurrentHigh <<= Bits;

-    /* Loop while the value is higher than or equal to the original divisor */
-    while ((ValueHigh > 0ULL) || (ValueLow >= Divisor))
+    while (TRUE)
     {
         /* Shift the quotient left by one bit */
         *QuotientHigh <<= 1;
@@ -109,6 +111,9 @@

/* Set the lowest bit of the quotient */
             *QuotientLow |= 1;
+
+            /* Stop if the value is lower than the original divisor */
+            if ((ValueHigh == 0ULL) && (ValueLow < Divisor)) break;
         }

/* Shift the current divisor right by one bit */