# New Ticket Created by "Carl Mäsak" # Please include the string: [perl #109740] # in the subject line of all future correspondence about this issue. # <URL: https://rt.perl.org:443/rt3/Ticket/Display.html?id=109740 >
<grondilu> nom: my ($x, $y) = (2**30, 1); printf "%32b\n", +^$x +& $y; <p6eval> nom acbec8: OUTPUT«1111000000000000000000000000000000000000000000000000000000000001» <grondilu> where do those four bits come from?? <grondilu> niecza: my ($x, $y) = (2**30, 1); printf "%32b", +^$x +& $y; <p6eval> niecza v13-389-g852f0ff: OUTPUT« 1» <moritz> grondilu: I just realized, libtommath (which we use for storing bigints) uses 28bit "digits" <moritz> grondilu: so there might indeed a bug in there somewhere <grondilu> oh, this explains a lot <moritz> grondilu: feel free to submit as rakudobug (or even fix if you want :-) <grondilu> I don't know how to. Someone please do it. * masak submits rakudobug <moritz> libtommath stores sign separately from the rest of the bits, which is why we need to emulate 2's complement math <moritz> and that part might be buggy
