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use strict;
use warnings;
use Config;
use Math::MPFR qw(:mpfr);
my $t = 1;
if(Math::MPFR::_can_pass_float128()) {
print "1..$t\n";
warn "\n Can pass _float128 between perl subs and XSubs\n";
Rmpfr_set_default_prec(113);
my $frac = 3.0; # For me, both C and perl miscalculates sqrt(2.0), so we'll
# sweep that one under the carpet and check using sqrt(3.0),
# which seems to be calculated correctly.
my $fr = Math::MPFR->new($frac);
$fr **= 0.5;
if($fr == sqrt($frac)) {print "ok 1\n"}
else {
my $check = sprintf "%a", Rmpfr_get_float128($fr, MPFR_RNDN);
warn "\n Expected $check\n Got ", sprintf "%a\n", sqrt($frac);
print "not ok 1\n";
}
}
elsif($Config{nvtype} eq '__float128') {
print "1..$t\n";
# First, work out the precision of the long double:
my ($frac, $prec) = (2.0, 0);
my $hex = scalar reverse unpack "h*", pack "D<", sqrt($frac);
$hex =~ s/^0+//;
my $len = length $hex;
$prec = $len == 20 ? 64
: $len == 32 ? 113 : 0;
if(!$prec) {
warn "\n Skipping tests - couldn't determine precision of long double\n";
print "ok $_\n" for 1 .. $t;
exit 0;
}
warn "\n Casting __float128 to $prec-bit precision long double\n";
Rmpfr_set_default_prec($prec);
my $fr1 = Math::MPFR->new(sqrt($frac));
my $fr2 = Math::MPFR->new();
Rmpfr_set_ld($fr2, sqrt($frac), MPFR_RNDN);
if($fr1 == $fr2) {print "ok 1\n"}
else {
warn "\n$fr1 != $fr2\n";
print "not ok 1\n";
}
}
else {
print "1..1\n";
warn "\n Skipping all tests - nvtype is $Config{nvtype}\n";
print "ok 1\n";
exit 0;
}
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