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Add a secp256k1_i128_to_u64 function.

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This commit is contained in:
Russell O'Connor
2022-10-25 10:37:22 -04:00
parent e40fd277b7
commit 4bc429019d
5 changed files with 59 additions and 43 deletions
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16
src/tests.c
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@@ -1806,7 +1806,7 @@ void load256i128(uint16_t* out, const secp256k1_int128* v) {
uint64_t lo;
int64_t hi;
secp256k1_int128 c = *v;
lo = secp256k1_i128_to_i64(&c);
lo = secp256k1_i128_to_u64(&c);
secp256k1_i128_rshift(&c, 64);
hi = secp256k1_i128_to_i64(&c);
load256two64(out, hi, lo, 1);
@@ -1923,8 +1923,8 @@ void run_int128_test_case(void) {
secp256k1_i128_rshift(&swz, uc % 127);
load256i128(rswz, &swz);
CHECK(secp256k1_memcmp_var(rswr, rswz, 16) == 0);
/* test secp256k1_i128_to_i64 */
CHECK((uint64_t)secp256k1_i128_to_i64(&swa) == v[0]);
/* test secp256k1_i128_to_u64 */
CHECK(secp256k1_i128_to_u64(&swa) == v[0]);
/* test secp256k1_i128_from_i64 */
secp256k1_i128_from_i64(&swz, sb);
load256i128(rswz, &swz);
@@ -1988,20 +1988,20 @@ void run_int128_tests(void) {
/* Compute INT128_MAX = 2^127 - 1 with secp256k1_i128_accum_mul */
secp256k1_i128_mul(&res, INT64_MAX, INT64_MAX);
secp256k1_i128_accum_mul(&res, INT64_MAX, INT64_MAX);
CHECK(secp256k1_i128_to_i64(&res) == 2);
CHECK(secp256k1_i128_to_u64(&res) == 2);
secp256k1_i128_accum_mul(&res, 4, 9223372036854775807);
secp256k1_i128_accum_mul(&res, 1, 1);
CHECK((uint64_t)secp256k1_i128_to_i64(&res) == UINT64_MAX);
CHECK(secp256k1_i128_to_u64(&res) == UINT64_MAX);
secp256k1_i128_rshift(&res, 64);
CHECK(secp256k1_i128_to_i64(&res) == INT64_MAX);
/* Compute INT128_MIN = - 2^127 with secp256k1_i128_accum_mul */
secp256k1_i128_mul(&res, INT64_MAX, INT64_MIN);
CHECK(secp256k1_i128_to_i64(&res) == INT64_MIN);
CHECK(secp256k1_i128_to_u64(&res) == (uint64_t)INT64_MIN);
secp256k1_i128_accum_mul(&res, INT64_MAX, INT64_MIN);
CHECK(secp256k1_i128_to_i64(&res) == 0);
CHECK(secp256k1_i128_to_u64(&res) == 0);
secp256k1_i128_accum_mul(&res, 2, INT64_MIN);
CHECK(secp256k1_i128_to_i64(&res) == 0);
CHECK(secp256k1_i128_to_u64(&res) == 0);
secp256k1_i128_rshift(&res, 64);
CHECK(secp256k1_i128_to_i64(&res) == INT64_MIN);
}