Julian Graham <jool...@gmail.com> writes: > It looks like there was a subtle but significant regression introduced > to the behavior of `bitwise-copy-bit' in `(rnrs arithmetic bitwise)' > back in 93da406f33. > > R6RS says [0] that function (with arguments EI1, EI2, EI3) should > transfer the EI2th bit from EI3 to EI1, but Guile's implementation was > always reading the 0th bit from EI3.
I was puzzled by this, because the same specification also states that "ei3 must be either 0 or 1", which clearly contradicts the part that you quoted, so I checked the R6RS errata. Here's what it says: <http://www.r6rs.org/r6rs-errata.html> In the specification of bitwise-copy-bit, "[...] by the ei2 bit of ei3" should be replaced by "[...] by ei3" So, I don't think there's a problem here. Please let me know if there's something I've missed. Regards, Mark
