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Use __shiftright128 intrinsic in secp256k1_u128_rshift on MSVC

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Hennadii Stepanov 2023-06-04 15:51:44 +01:00
parent 60556c9f49
commit 5b7bf2e9d4
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1 changed files with 5 additions and 0 deletions
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src/int128_struct_impl.h
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@ -80,7 +80,12 @@ static SECP256K1_INLINE void secp256k1_u128_rshift(secp256k1_uint128 *r, unsigne
r->lo = r->hi >> (n-64); r->lo = r->hi >> (n-64);
r->hi = 0; r->hi = 0;
} else if (n > 0) { } else if (n > 0) {
#if defined(_MSC_VER) && defined(_M_X64)
VERIFY_CHECK(n < 64);
r->lo = __shiftright128(r->lo, r->hi, n);
#else
r->lo = ((1U * r->hi) << (64-n)) | r->lo >> n; r->lo = ((1U * r->hi) << (64-n)) | r->lo >> n;
#endif
r->hi >>= n; r->hi >>= n;
} }
} }