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No need to subtract 1 before doing a right shift #1250

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merged 1 commit into from Mar 28, 2023
Merged

No need to subtract 1 before doing a right shift #1250

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2 changes: 1 addition & 1 deletion src/int128_struct_impl.h
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Expand Up @@ -193,7 +193,7 @@ static SECP256K1_INLINE int secp256k1_i128_check_pow2(const secp256k1_int128 *r,
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;
: r->hi == (uint64_t)(sign >> 1) && r->lo == (uint64_t)sign << n;
}

#endif