Commit 1edaeee0 authored by Richard Henderson's avatar Richard Henderson
Browse files

int128: Add int128_make128 



Allows Int128 to be used more generally, rather than having to
begin with 64-bit inputs and accumulate.

Reviewed-by: default avatarEmilio G. Cota <cota@braap.org>
Reviewed-by: default avatarAlex Bennée <alex.bennee@linaro.org>
Signed-off-by: default avatarRichard Henderson <rth@twiddle.net>
parent 0846beb3

include/qemu/int128.h

+15 −5
Original line number Diff line number Diff line
@@ -10,6 +10,11 @@ static inline Int128 int128_make64(uint64_t a) 
    return a;

}



static inline Int128 int128_make128(uint64_t lo, uint64_t hi)

{

    return (__uint128_t)hi << 64 | lo;

}



static inline uint64_t int128_get64(Int128 a)

{

    uint64_t r = a;
@@ -146,6 +151,11 @@ static inline Int128 int128_make64(uint64_t a) 
    return (Int128) { a, 0 };

}



static inline Int128 int128_make128(uint64_t lo, uint64_t hi)

{

    return (Int128) { lo, hi };

}



static inline uint64_t int128_get64(Int128 a)

{

    assert(!a.hi);
@@ -195,9 +205,9 @@ static inline Int128 int128_rshift(Int128 a, int n) 
    }

    h = a.hi >> (n & 63);

    if (n >= 64) {

        return (Int128) { h, h >> 63 };

        return int128_make128(h, h >> 63);

    } else {

        return (Int128) { (a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h };

        return int128_make128((a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h);

    }

}
@@ -211,18 +221,18 @@ static inline Int128 int128_add(Int128 a, Int128 b) 
     *

     * So the carry is lo < a.lo.

     */

    return (Int128) { lo, (uint64_t)a.hi + b.hi + (lo < a.lo) };

    return int128_make128(lo, (uint64_t)a.hi + b.hi + (lo < a.lo));

}



static inline Int128 int128_neg(Int128 a)

{

    uint64_t lo = -a.lo;

    return (Int128) { lo, ~(uint64_t)a.hi + !lo };

    return int128_make128(lo, ~(uint64_t)a.hi + !lo);

}



static inline Int128 int128_sub(Int128 a, Int128 b)

{

    return (Int128){ a.lo - b.lo, (uint64_t)a.hi - b.hi - (a.lo < b.lo) };

    return int128_make128(a.lo - b.lo, (uint64_t)a.hi - b.hi - (a.lo < b.lo));

}



static inline bool int128_nonneg(Int128 a)