Archipelago » qemu

/*

===============================================================================

This C source fragment is part of the SoftFloat IEC/IEEE Floating-point

Arithmetic Package, Release 2.

Written by John R. Hauser.  This work was made possible in part by the

International Computer Science Institute, located at Suite 600, 1947 Center

Street, Berkeley, California 94704.  Funding was partially provided by the

National Science Foundation under grant MIP-9311980.  The original version

of this code was written as part of a project to build a fixed-point vector

processor in collaboration with the University of California at Berkeley,

overseen by Profs. Nelson Morgan and John Wawrzynek.  More information

is available through the web page `http://HTTP.CS.Berkeley.EDU/~jhauser/

arithmetic/softfloat.html'.

THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort

has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT

TIMES RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO

PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY

AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.

Derivative works are acceptable, even for commercial purposes, so long as

(1) they include prominent notice that the work is derivative, and (2) they

include prominent notice akin to these three paragraphs for those parts of

this code that are retained.

===============================================================================

*/

/*

-------------------------------------------------------------------------------

Shifts `a' right by the number of bits given in `count'.  If any nonzero

bits are shifted off, they are ``jammed'' into the least significant bit of

the result by setting the least significant bit to 1.  The value of `count'

can be arbitrarily large; in particular, if `count' is greater than 32, the

result will be either 0 or 1, depending on whether `a' is zero or nonzero.

The result is stored in the location pointed to by `zPtr'.

-------------------------------------------------------------------------------

*/

INLINE void shift32RightJamming( bits32 a, int16 count, bits32 *zPtr )

{

    bits32 z;

    if ( count == 0 ) {

        z = a;

    }

    else if ( count < 32 ) {

        z = ( a>>count ) | ( ( a<<( ( - count ) & 31 ) ) != 0 );

    }

    else {

        z = ( a != 0 );

    }

    *zPtr = z;

}

/*

-------------------------------------------------------------------------------

Shifts `a' right by the number of bits given in `count'.  If any nonzero

bits are shifted off, they are ``jammed'' into the least significant bit of

the result by setting the least significant bit to 1.  The value of `count'

can be arbitrarily large; in particular, if `count' is greater than 64, the

result will be either 0 or 1, depending on whether `a' is zero or nonzero.

The result is stored in the location pointed to by `zPtr'.

-------------------------------------------------------------------------------

*/

INLINE void shift64RightJamming( bits64 a, int16 count, bits64 *zPtr )

{

    bits64 z;

// __asm__("@shift64RightJamming -- start");   

    if ( count == 0 ) {

        z = a;

    }

    else if ( count < 64 ) {

        z = ( a>>count ) | ( ( a<<( ( - count ) & 63 ) ) != 0 );

    }

    else {

        z = ( a != 0 );

    }

// __asm__("@shift64RightJamming -- end");   

    *zPtr = z;

}

/*

-------------------------------------------------------------------------------

Shifts the 128-bit value formed by concatenating `a0' and `a1' right by 64

_plus_ the number of bits given in `count'.  The shifted result is at most

64 nonzero bits; this is stored at the location pointed to by `z0Ptr'.  The

bits shifted off form a second 64-bit result as follows:  The _last_ bit

shifted off is the most-significant bit of the extra result, and the other

63 bits of the extra result are all zero if and only if _all_but_the_last_

bits shifted off were all zero.  This extra result is stored in the location

pointed to by `z1Ptr'.  The value of `count' can be arbitrarily large.

    (This routine makes more sense if `a0' and `a1' are considered to form a

fixed-point value with binary point between `a0' and `a1'.  This fixed-point

value is shifted right by the number of bits given in `count', and the

integer part of the result is returned at the location pointed to by

`z0Ptr'.  The fractional part of the result may be slightly corrupted as

described above, and is returned at the location pointed to by `z1Ptr'.)

-------------------------------------------------------------------------------

*/

INLINE void

 shift64ExtraRightJamming(

     bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )

{

    bits64 z0, z1;

    int8 negCount = ( - count ) & 63;

    if ( count == 0 ) {

        z1 = a1;

        z0 = a0;

    }

    else if ( count < 64 ) {

        z1 = ( a0<<negCount ) | ( a1 != 0 );

        z0 = a0>>count;

    }

    else {

        if ( count == 64 ) {

            z1 = a0 | ( a1 != 0 );

        }

        else {

            z1 = ( ( a0 | a1 ) != 0 );

        }

        z0 = 0;

    }

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Shifts the 128-bit value formed by concatenating `a0' and `a1' right by the

number of bits given in `count'.  Any bits shifted off are lost.  The value

of `count' can be arbitrarily large; in particular, if `count' is greater

than 128, the result will be 0.  The result is broken into two 64-bit pieces

which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 shift128Right(

     bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )

{

    bits64 z0, z1;

    int8 negCount = ( - count ) & 63;

    if ( count == 0 ) {

        z1 = a1;

        z0 = a0;

    }

    else if ( count < 64 ) {

        z1 = ( a0<<negCount ) | ( a1>>count );

        z0 = a0>>count;

    }

    else {

        z1 = ( count < 64 ) ? ( a0>>( count & 63 ) ) : 0;

        z0 = 0;

    }

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Shifts the 128-bit value formed by concatenating `a0' and `a1' right by the

number of bits given in `count'.  If any nonzero bits are shifted off, they

are ``jammed'' into the least significant bit of the result by setting the

least significant bit to 1.  The value of `count' can be arbitrarily large;

in particular, if `count' is greater than 128, the result will be either 0

or 1, depending on whether the concatenation of `a0' and `a1' is zero or

nonzero.  The result is broken into two 64-bit pieces which are stored at

the locations pointed to by `z0Ptr' and `z1Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 shift128RightJamming(

     bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )

{

    bits64 z0, z1;

    int8 negCount = ( - count ) & 63;

    if ( count == 0 ) {

        z1 = a1;

        z0 = a0;

    }

    else if ( count < 64 ) {

        z1 = ( a0<<negCount ) | ( a1>>count ) | ( ( a1<<negCount ) != 0 );

        z0 = a0>>count;

    }

    else {

        if ( count == 64 ) {

            z1 = a0 | ( a1 != 0 );

        }

        else if ( count < 128 ) {

            z1 = ( a0>>( count & 63 ) ) | ( ( ( a0<<negCount ) | a1 ) != 0 );

        }

        else {

            z1 = ( ( a0 | a1 ) != 0 );

        }

        z0 = 0;

    }

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Shifts the 192-bit value formed by concatenating `a0', `a1', and `a2' right

by 64 _plus_ the number of bits given in `count'.  The shifted result is

at most 128 nonzero bits; these are broken into two 64-bit pieces which are

stored at the locations pointed to by `z0Ptr' and `z1Ptr'.  The bits shifted

off form a third 64-bit result as follows:  The _last_ bit shifted off is

the most-significant bit of the extra result, and the other 63 bits of the

extra result are all zero if and only if _all_but_the_last_ bits shifted off

were all zero.  This extra result is stored in the location pointed to by

`z2Ptr'.  The value of `count' can be arbitrarily large.

    (This routine makes more sense if `a0', `a1', and `a2' are considered

to form a fixed-point value with binary point between `a1' and `a2'.  This

fixed-point value is shifted right by the number of bits given in `count',

and the integer part of the result is returned at the locations pointed to

by `z0Ptr' and `z1Ptr'.  The fractional part of the result may be slightly

corrupted as described above, and is returned at the location pointed to by

`z2Ptr'.)

-------------------------------------------------------------------------------

*/

INLINE void

 shift128ExtraRightJamming(

     bits64 a0,

     bits64 a1,

     bits64 a2,

     int16 count,

     bits64 *z0Ptr,

     bits64 *z1Ptr,

     bits64 *z2Ptr

 )

{

    bits64 z0, z1, z2;

    int8 negCount = ( - count ) & 63;

    if ( count == 0 ) {

        z2 = a2;

        z1 = a1;

        z0 = a0;

    }

    else {

        if ( count < 64 ) {

            z2 = a1<<negCount;

            z1 = ( a0<<negCount ) | ( a1>>count );

            z0 = a0>>count;

        }

        else {

            if ( count == 64 ) {

                z2 = a1;

                z1 = a0;

            }

            else {

                a2 |= a1;

                if ( count < 128 ) {

                    z2 = a0<<negCount;

                    z1 = a0>>( count & 63 );

                }

                else {

                    z2 = ( count == 128 ) ? a0 : ( a0 != 0 );

                    z1 = 0;

                }

            }

            z0 = 0;

        }

        z2 |= ( a2 != 0 );

    }

    *z2Ptr = z2;

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Shifts the 128-bit value formed by concatenating `a0' and `a1' left by the

number of bits given in `count'.  Any bits shifted off are lost.  The value

of `count' must be less than 64.  The result is broken into two 64-bit

pieces which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 shortShift128Left(

     bits64 a0, bits64 a1, int16 count, bits64 *z0Ptr, bits64 *z1Ptr )

{

    *z1Ptr = a1<<count;

    *z0Ptr =

        ( count == 0 ) ? a0 : ( a0<<count ) | ( a1>>( ( - count ) & 63 ) );

}

/*

-------------------------------------------------------------------------------

Shifts the 192-bit value formed by concatenating `a0', `a1', and `a2' left

by the number of bits given in `count'.  Any bits shifted off are lost.

The value of `count' must be less than 64.  The result is broken into three

64-bit pieces which are stored at the locations pointed to by `z0Ptr',

`z1Ptr', and `z2Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 shortShift192Left(

     bits64 a0,

     bits64 a1,

     bits64 a2,

     int16 count,

     bits64 *z0Ptr,

     bits64 *z1Ptr,

     bits64 *z2Ptr

 )

{

    bits64 z0, z1, z2;

    int8 negCount;

    z2 = a2<<count;

    z1 = a1<<count;

    z0 = a0<<count;

    if ( 0 < count ) {

        negCount = ( ( - count ) & 63 );

        z1 |= a2>>negCount;

        z0 |= a1>>negCount;

    }

    *z2Ptr = z2;

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Adds the 128-bit value formed by concatenating `a0' and `a1' to the 128-bit

value formed by concatenating `b0' and `b1'.  Addition is modulo 2^128, so

any carry out is lost.  The result is broken into two 64-bit pieces which

are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 add128(

     bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 *z0Ptr, bits64 *z1Ptr )

{

    bits64 z1;

    z1 = a1 + b1;

    *z1Ptr = z1;

    *z0Ptr = a0 + b0 + ( z1 < a1 );

}

/*

-------------------------------------------------------------------------------

Adds the 192-bit value formed by concatenating `a0', `a1', and `a2' to the

192-bit value formed by concatenating `b0', `b1', and `b2'.  Addition is

modulo 2^192, so any carry out is lost.  The result is broken into three

64-bit pieces which are stored at the locations pointed to by `z0Ptr',

`z1Ptr', and `z2Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 add192(

     bits64 a0,

     bits64 a1,

     bits64 a2,

     bits64 b0,

     bits64 b1,

     bits64 b2,

     bits64 *z0Ptr,

     bits64 *z1Ptr,

     bits64 *z2Ptr

 )

{

    bits64 z0, z1, z2;

    int8 carry0, carry1;

    z2 = a2 + b2;

    carry1 = ( z2 < a2 );

    z1 = a1 + b1;

    carry0 = ( z1 < a1 );

    z0 = a0 + b0;

    z1 += carry1;

    z0 += ( z1 < carry1 );

    z0 += carry0;

    *z2Ptr = z2;

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Subtracts the 128-bit value formed by concatenating `b0' and `b1' from the

128-bit value formed by concatenating `a0' and `a1'.  Subtraction is modulo

2^128, so any borrow out (carry out) is lost.  The result is broken into two

64-bit pieces which are stored at the locations pointed to by `z0Ptr' and

`z1Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 sub128(

     bits64 a0, bits64 a1, bits64 b0, bits64 b1, bits64 *z0Ptr, bits64 *z1Ptr )

{

    *z1Ptr = a1 - b1;

    *z0Ptr = a0 - b0 - ( a1 < b1 );

}

/*

-------------------------------------------------------------------------------

Subtracts the 192-bit value formed by concatenating `b0', `b1', and `b2'

from the 192-bit value formed by concatenating `a0', `a1', and `a2'.

Subtraction is modulo 2^192, so any borrow out (carry out) is lost.  The

result is broken into three 64-bit pieces which are stored at the locations

pointed to by `z0Ptr', `z1Ptr', and `z2Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 sub192(

     bits64 a0,

     bits64 a1,

     bits64 a2,

     bits64 b0,

     bits64 b1,

     bits64 b2,

     bits64 *z0Ptr,

     bits64 *z1Ptr,

     bits64 *z2Ptr

 )

{

    bits64 z0, z1, z2;

    int8 borrow0, borrow1;

    z2 = a2 - b2;

    borrow1 = ( a2 < b2 );

    z1 = a1 - b1;

    borrow0 = ( a1 < b1 );

    z0 = a0 - b0;

    z0 -= ( z1 < borrow1 );

    z1 -= borrow1;

    z0 -= borrow0;

    *z2Ptr = z2;

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Multiplies `a' by `b' to obtain a 128-bit product.  The product is broken

into two 64-bit pieces which are stored at the locations pointed to by

`z0Ptr' and `z1Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void mul64To128( bits64 a, bits64 b, bits64 *z0Ptr, bits64 *z1Ptr )

{

    bits32 aHigh, aLow, bHigh, bLow;

    bits64 z0, zMiddleA, zMiddleB, z1;

    aLow = a;

    aHigh = a>>32;

    bLow = b;

    bHigh = b>>32;

    z1 = ( (bits64) aLow ) * bLow;

    zMiddleA = ( (bits64) aLow ) * bHigh;

    zMiddleB = ( (bits64) aHigh ) * bLow;

    z0 = ( (bits64) aHigh ) * bHigh;

    zMiddleA += zMiddleB;

    z0 += ( ( (bits64) ( zMiddleA < zMiddleB ) )<<32 ) + ( zMiddleA>>32 );

    zMiddleA <<= 32;

    z1 += zMiddleA;

    z0 += ( z1 < zMiddleA );

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Multiplies the 128-bit value formed by concatenating `a0' and `a1' by `b' to

obtain a 192-bit product.  The product is broken into three 64-bit pieces

which are stored at the locations pointed to by `z0Ptr', `z1Ptr', and

`z2Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 mul128By64To192(

     bits64 a0,

     bits64 a1,

     bits64 b,

     bits64 *z0Ptr,

     bits64 *z1Ptr,

     bits64 *z2Ptr

 )

{

    bits64 z0, z1, z2, more1;

    mul64To128( a1, b, &z1, &z2 );

    mul64To128( a0, b, &z0, &more1 );

    add128( z0, more1, 0, z1, &z0, &z1 );

    *z2Ptr = z2;

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Multiplies the 128-bit value formed by concatenating `a0' and `a1' to the

128-bit value formed by concatenating `b0' and `b1' to obtain a 256-bit

product.  The product is broken into four 64-bit pieces which are stored at

the locations pointed to by `z0Ptr', `z1Ptr', `z2Ptr', and `z3Ptr'.

-------------------------------------------------------------------------------

*/

INLINE void

 mul128To256(

     bits64 a0,

     bits64 a1,

     bits64 b0,

     bits64 b1,

     bits64 *z0Ptr,

     bits64 *z1Ptr,

     bits64 *z2Ptr,

     bits64 *z3Ptr

 )

{

    bits64 z0, z1, z2, z3;

    bits64 more1, more2;

    mul64To128( a1, b1, &z2, &z3 );

    mul64To128( a1, b0, &z1, &more2 );

    add128( z1, more2, 0, z2, &z1, &z2 );

    mul64To128( a0, b0, &z0, &more1 );

    add128( z0, more1, 0, z1, &z0, &z1 );

    mul64To128( a0, b1, &more1, &more2 );

    add128( more1, more2, 0, z2, &more1, &z2 );

    add128( z0, z1, 0, more1, &z0, &z1 );

    *z3Ptr = z3;

    *z2Ptr = z2;

    *z1Ptr = z1;

    *z0Ptr = z0;

}

/*

-------------------------------------------------------------------------------

Returns an approximation to the 64-bit integer quotient obtained by dividing

`b' into the 128-bit value formed by concatenating `a0' and `a1'.  The

divisor `b' must be at least 2^63.  If q is the exact quotient truncated

toward zero, the approximation returned lies between q and q + 2 inclusive.

If the exact quotient q is larger than 64 bits, the maximum positive 64-bit

unsigned integer is returned.

-------------------------------------------------------------------------------

*/

static bits64 estimateDiv128To64( bits64 a0, bits64 a1, bits64 b )

{

    bits64 b0, b1;

    bits64 rem0, rem1, term0, term1;

    bits64 z;

    if ( b <= a0 ) return LIT64( 0xFFFFFFFFFFFFFFFF );

    b0 = b>>32;

    z = ( b0<<32 <= a0 ) ? LIT64( 0xFFFFFFFF00000000 ) : ( a0 / b0 )<<32;

    mul64To128( b, z, &term0, &term1 );

    sub128( a0, a1, term0, term1, &rem0, &rem1 );

    while ( ( (sbits64) rem0 ) < 0 ) {

        z -= LIT64( 0x100000000 );

        b1 = b<<32;

        add128( rem0, rem1, b0, b1, &rem0, &rem1 );

    }

    rem0 = ( rem0<<32 ) | ( rem1>>32 );

    z |= ( b0<<32 <= rem0 ) ? 0xFFFFFFFF : rem0 / b0;

    return z;

}

/*

-------------------------------------------------------------------------------

Returns an approximation to the square root of the 32-bit significand given

by `a'.  Considered as an integer, `a' must be at least 2^31.  If bit 0 of

`aExp' (the least significant bit) is 1, the integer returned approximates

2^31*sqrt(`a'/2^31), where `a' is considered an integer.  If bit 0 of `aExp'

is 0, the integer returned approximates 2^31*sqrt(`a'/2^30).  In either

case, the approximation returned lies strictly within +/-2 of the exact

value.

-------------------------------------------------------------------------------

*/

static bits32 estimateSqrt32( int16 aExp, bits32 a )

{

    static const bits16 sqrtOddAdjustments[] = {

        0x0004, 0x0022, 0x005D, 0x00B1, 0x011D, 0x019F, 0x0236, 0x02E0,

        0x039C, 0x0468, 0x0545, 0x0631, 0x072B, 0x0832, 0x0946, 0x0A67

    };

    static const bits16 sqrtEvenAdjustments[] = {

        0x0A2D, 0x08AF, 0x075A, 0x0629, 0x051A, 0x0429, 0x0356, 0x029E,

        0x0200, 0x0179, 0x0109, 0x00AF, 0x0068, 0x0034, 0x0012, 0x0002

    };

    int8 index;

    bits32 z;

    index = ( a>>27 ) & 15;

    if ( aExp & 1 ) {

        z = 0x4000 + ( a>>17 ) - sqrtOddAdjustments[ index ];

        z = ( ( a / z )<<14 ) + ( z<<15 );

        a >>= 1;

    }

    else {

        z = 0x8000 + ( a>>17 ) - sqrtEvenAdjustments[ index ];

        z = a / z + z;

        z = ( 0x20000 <= z ) ? 0xFFFF8000 : ( z<<15 );

        if ( z <= a ) return (bits32) ( ( (sbits32) a )>>1 );

    }

    return ( (bits32) ( ( ( (bits64) a )<<31 ) / z ) ) + ( z>>1 );

}

/*

-------------------------------------------------------------------------------

Returns the number of leading 0 bits before the most-significant 1 bit

of `a'.  If `a' is zero, 32 is returned.

-------------------------------------------------------------------------------

*/

static int8 countLeadingZeros32( bits32 a )

{

    static const int8 countLeadingZerosHigh[] = {

        8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,

        3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,

        2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

        2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,

        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

        1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0

    };

    int8 shiftCount;

    shiftCount = 0;

    if ( a < 0x10000 ) {

        shiftCount += 16;

        a <<= 16;

    }

    if ( a < 0x1000000 ) {

        shiftCount += 8;

        a <<= 8;

    }

    shiftCount += countLeadingZerosHigh[ a>>24 ];

    return shiftCount;

}

/*

-------------------------------------------------------------------------------

Returns the number of leading 0 bits before the most-significant 1 bit

of `a'.  If `a' is zero, 64 is returned.

-------------------------------------------------------------------------------

*/

static int8 countLeadingZeros64( bits64 a )

{

    int8 shiftCount;

    shiftCount = 0;

    if ( a < ( (bits64) 1 )<<32 ) {

        shiftCount += 32;

    }

    else {

        a >>= 32;

    }

    shiftCount += countLeadingZeros32( a );

    return shiftCount;

}

/*

-------------------------------------------------------------------------------

Returns 1 if the 128-bit value formed by concatenating `a0' and `a1'

is equal to the 128-bit value formed by concatenating `b0' and `b1'.

Otherwise, returns 0.

-------------------------------------------------------------------------------

*/

INLINE flag eq128( bits64 a0, bits64 a1, bits64 b0, bits64 b1 )

{

    return ( a0 == b0 ) && ( a1 == b1 );

}

/*

-------------------------------------------------------------------------------

Returns 1 if the 128-bit value formed by concatenating `a0' and `a1' is less

than or equal to the 128-bit value formed by concatenating `b0' and `b1'.

Otherwise, returns 0.

-------------------------------------------------------------------------------

*/

INLINE flag le128( bits64 a0, bits64 a1, bits64 b0, bits64 b1 )

{

    return ( a0 < b0 ) || ( ( a0 == b0 ) && ( a1 <= b1 ) );

}

/*

-------------------------------------------------------------------------------

Returns 1 if the 128-bit value formed by concatenating `a0' and `a1' is less

than the 128-bit value formed by concatenating `b0' and `b1'.  Otherwise,

returns 0.

-------------------------------------------------------------------------------

*/

INLINE flag lt128( bits64 a0, bits64 a1, bits64 b0, bits64 b1 )

{

    return ( a0 < b0 ) || ( ( a0 == b0 ) && ( a1 < b1 ) );

}

/*

-------------------------------------------------------------------------------

Returns 1 if the 128-bit value formed by concatenating `a0' and `a1' is

not equal to the 128-bit value formed by concatenating `b0' and `b1'.

Otherwise, returns 0.

-------------------------------------------------------------------------------

*/

INLINE flag ne128( bits64 a0, bits64 a1, bits64 b0, bits64 b1 )

{

    return ( a0 != b0 ) || ( a1 != b1 );

}