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Simplify big_int_not for negative inputs

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gingerBill
2021-07-11 17:43:56 +01:00
parent 3600b2e209
commit ff2e5c3efe
1 changed files with 8 additions and 0 deletions
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src/big_int.cpp
+8
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@@ -415,6 +415,14 @@ void big_int_not(BigInt *dst, BigInt const *x, i32 bit_count, bool is_signed) {
big_int_from_u64(dst, 0); big_int_from_u64(dst, 0);
return; return;
} }
if (big_int_is_neg(x)) {
// ~x == -x - 1
big_int_neg(dst, x);
mp_decr(dst);
mp_mod_2d(dst, bit_count, dst);
return;
}
BigInt pow2b = {}; BigInt pow2b = {};
mp_2expt(&pow2b, bit_count); mp_2expt(&pow2b, bit_count);