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[FAST486]

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Fix a bug in UnsignedDivMod128.


svn path=/trunk/; revision=65946
This commit is contained in:
Aleksandar Andrejevic 2015-01-03 03:52:50 +00:00
parent d8f89bc80c
commit f122f72179
1 changed files with 7 additions and 2 deletions
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9
reactos/lib/fast486/fpu.c
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@ -84,12 +84,14 @@ UnsignedDivMod128(ULONGLONG DividendLow,
/* Initialize the quotient */ /* Initialize the quotient */
*QuotientLow = *QuotientHigh = 0ULL; *QuotientLow = *QuotientHigh = 0ULL;
/* Exit early if the dividend is lower than the divisor */
if ((DividendHigh == 0ULL) && (DividendLow < Divisor)) return ValueLow;
/* Normalize the current divisor */ /* Normalize the current divisor */
Bits = CountLeadingZeros64(CurrentHigh); Bits = CountLeadingZeros64(CurrentHigh);
CurrentHigh <<= Bits; CurrentHigh <<= Bits;
/* Loop while the value is higher than or equal to the original divisor */ while (TRUE)
while ((ValueHigh > 0ULL) || (ValueLow >= Divisor))
{ {
/* Shift the quotient left by one bit */ /* Shift the quotient left by one bit */
*QuotientHigh <<= 1; *QuotientHigh <<= 1;
@ -109,6 +111,9 @@ UnsignedDivMod128(ULONGLONG DividendLow,
/* Set the lowest bit of the quotient */ /* Set the lowest bit of the quotient */
*QuotientLow |= 1; *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 */ /* Shift the current divisor right by one bit */