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Make secp256k1_i128_check_pow2 support -(2^n)

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This commit is contained in:
Pieter Wuille
2022-12-10 15:13:43 -05:00
parent cbd2555934
commit 5fffb2c7af
5 changed files with 43 additions and 15 deletions
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9
src/int128_struct_impl.h
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@@ -189,10 +189,11 @@ static SECP256K1_INLINE int secp256k1_i128_eq_var(const secp256k1_int128 *a, con
return a->hi == b->hi && a->lo == b->lo;
}
static SECP256K1_INLINE int secp256k1_i128_check_pow2(const secp256k1_int128 *r, unsigned int n) {
VERIFY_CHECK(n < 127);
return n >= 64 ? r->hi == (uint64_t)1 << (n - 64) && r->lo == 0
: r->hi == 0 && r->lo == (uint64_t)1 << n;
static SECP256K1_INLINE int secp256k1_i128_check_pow2(const secp256k1_int128 *r, unsigned int n, int sign) {
VERIFY_CHECK(n < 127);
VERIFY_CHECK(sign == 1 || sign == -1);
return n >= 64 ? r->hi == (uint64_t)sign << (n - 64) && r->lo == 0
: r->hi == (uint64_t)((sign - 1) >> 1) && r->lo == (uint64_t)sign << n;
}
#endif