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int128: Add int128_make128

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

Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-06-29 16:57:26 -07:00
parent 0846beb366
commit 1edaeee095
1 changed files with 15 additions and 5 deletions
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20
include/qemu/int128.h
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@ -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)