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Diffstat (limited to 'arch/arm26/nwfpe/softfloat-macros')
| -rw-r--r-- | arch/arm26/nwfpe/softfloat-macros | 740 |
1 files changed, 0 insertions, 740 deletions
diff --git a/arch/arm26/nwfpe/softfloat-macros b/arch/arm26/nwfpe/softfloat-macros deleted file mode 100644 index 5469989f2c5e..000000000000 --- a/arch/arm26/nwfpe/softfloat-macros +++ /dev/null @@ -1,740 +0,0 @@ - -/* -=============================================================================== - -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 ); - -} - |