How to handle 64 bit arithmetic operation at 32 bit compiled perl interpreter?H
Hi,
Here is the issue. From the program snippet I have Base: 0x1800000000, Size: 0x3FFE7FFFFFFFF which are of 40 and 56 bits. SO I used use bignum to do the math but summing them up I always failed having correct result.
Code:
perl interpreter info,
perl, v5.8.8 built for i386-linux-thread-multi
Program snippet,
Code:
use bignum qw/hex/;
$x ="SAD_MISS_REGION:Base:Size
SAD_MISS_REGION:0x100000000:0x100000000
SAD_MISS_REGION:0x400000000:0x400000000
SAD_MISS_REGION:0x1800000000:0x3FFE7FFFFFFFF";
while ( $x =~ /SAD_MISS_REGION:(.+):(.+)/g ) {
$p = $1; $q = $2;
$phex = hex($1); $qhex = hex($2);
}
print "\n\n\n\nBase: $p, Size: $q \n";
print "\n\n\n\nBaseinDecimal: $phex, SizeinDesimal: $qhex \n";
$z = $phex + $qhex;
print "Z has summed up value: $z\n";
$zhex = unpack "H*", $z;
#$zhex = uc(sprintf("%x\n", $z));
print "Hexadecimal number of Z: ", $zhex, "\n";
output:
Base: 0x1800000000, Size: 0x3FFE7FFFFFFFF
BaseinDecimal: 103079215104, SizeinDesimal: 1125796827627519
Z has summed up value: 1125899906842623
Hexadecimal number of Z: 31313235383939393036383432363233
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LEARN ABOUT HPUX
copysignd32
copysignd64(3M)copysignd64(3M)NAME
copysignd64(), copysignd128(), copysignd32() - decimal copysign functions
SYNOPSIS DESCRIPTION
The function returns x with its sign changed to the sign of y.
is a version of it takes arguments and returns a result.
is a version of it takes arguments and returns a result.
These math functions are supported for HP-UX 11i Version 3 September 2008 Update and forward.
USAGE
To use any of these functions, compile with the option.
Make sure your program defines and then includes
Link in the math library by specifying or on the linking command line.
For more information, see the at the following site:
RETURN VALUE
These functions simply copy the bit encoding of x, replacing the sign bit with the sign bit of y.
These functions raise no exceptions.
ERRORS
No errors are defined.
SEE ALSO fabsd64(3M), fpclassify(3M), remainderd64(3M), scalbnd64(3M), signbit(3M), math(5).
STANDARDS CONFORMANCE
These functions conform to ISO/IEC TR 24732, "Extension for the programming language C to support decimal floating-point arithmetic".
HP Integrity Server Only copysignd64(3M)
07-11-2012
