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* arith.txr (highest_bit): Oops, half the logic for
the 64 bit case was missing due to to a cut and paste mistake.
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* arith.txr (highest_bit): New function.
(mul): Use highest_bit instead of shift based algorithm.
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* arith.c: Regenerated.
* arith.txr (CNUM_BIT): New constant.
(bignum, bignum_dbl_ipt): New static functions.
(@{add-fname}): Use bignum function.
(mul): New functions, rewrite of mul from lib.c.
* lib.c (mul): Function removed.
* mpi-patches/add-mp-set-intptr (mp_set_intptr): Revised patch.
Local variable v should be int_ptr_t not unsigned long.
Also, the mp_set interface doesn't set the sign; it's an unsigned
interface. We must do that ourselves.
* mpi-patches/fix-mult-bug: The main multiplication function is
also broken in the same way, requiring the cast.
* mpi-patches/mpi-set-double-intptr: Fixed use of wrong type for
local variable v.
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(NOOP): New macro.
(plus): Use NOOP macro.
(minus, neg): Function moved here from lib.c and rewritten
for bignum support.
* lib.c (minus, neg): Functions removed.
* arith.txr: New file.
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