http://d.puremagic.com/issues/show_bug.cgi?id=6819
Summary: BigInt ^^ fails for some big numbers (powers)
Product: D
Version: D2
Platform: x86_64
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Phobos
AssignedTo: [email protected]
ReportedBy: [email protected]
--- Comment #0 from Olivier Fabre <[email protected]> 2011-10-16
16:16:40 PDT ---
With dmd 2.055 under Linux x86-64, (BigInt(10)^^p)^^2 doesn't return the
correct result starting from p == 32:
import std.stdio, std.bigint;
void main() {
for( int p = 0 ; p < 40 ; p++ ) {
BigInt n = BigInt(10)^^p;
BigInt a = n*n;
BigInt b = n^^2;
if( a != b ) {
writefln( "%s %s %s %s", p, n, a, b );
}
}
}
It also fails with BigInt(2)^^p (from p==32 too) and BigInt(20)^^p (from
p==16).
Values like (BigInt(2)^^32+1)^^2 are computed correctly.
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