13 commits

Author	SHA1	Message	Date
Dag-Erling Smørgrav	7a90ca7b42	Since X may point to the same MPI as either G or L (or even both), we ... can't set the carry flag based on the contents of G or L after having modified X. Instead, compute and stash the new carry value first.	2014-12-30 19:14:59 +00:00
Dag-Erling Smørgrav	0d483f20ab	Fix msb calculation. We may have to backtrack quite a bit, for ... instance when subtracting two nearly equal large numbers.	2014-12-30 16:45:18 +00:00
Dag-Erling Smørgrav	1c024928f9	Fix off-by-one bug in mpi_cmp() which could cause it to read past the ... end of the buffer.	2014-12-30 16:35:13 +00:00
Dag-Erling Smørgrav	43b870dc83	WIP: implement subtraction correctly. The actual result is now correct ... most of the time, but the MSB calculation is not.	2014-12-30 11:23:30 +00:00
Dag-Erling Smørgrav	7524a14386	comment nit	2014-12-30 11:15:28 +00:00
Dag-Erling Smørgrav	c5b962387c	Add mpi_eq_abs() and mpi_eq() predicates.	2014-12-30 11:12:11 +00:00
Dag-Erling Smørgrav	bc8e9d67ba	In both mpi_add_abs() and mpi_sub_abs(), make sure that the target is ... untouched if the operation fails. Also ensure that A = A +/- A works.	2014-12-29 23:44:34 +00:00
Dag-Erling Smørgrav	98c6349d4a	In mpi_zero(), save a memset() if the target is already zero.	2014-12-29 23:22:54 +00:00
Dag-Erling Smørgrav	1412dac680	Shifting any number by zero places is a no-op, but so is shifting zero by ... any number of places.	2014-12-29 23:20:26 +00:00
Dag-Erling Smørgrav	8228f19d5a	In mpi_copy(), any failure should leave the target untouched.	2014-12-29 23:18:57 +00:00
Dag-Erling Smørgrav	82f5c5cf77	In mpi_load(), use be32dec() when possible. ... In mpi_set(), it is impossible for the value being loaded to exceed the minimum size of an mpi; thus, there is no need for mpi_grow().	2014-12-29 15:08:09 +00:00
Dag-Erling Smørgrav	d4fd9a1958	rm unused variable	2014-08-12 07:33:30 +00:00
Dag-Erling Smørgrav	be31515f5e	Start of a multiple-precision integer arithmetic library.	2014-08-12 07:30:31 +00:00