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include/qemu/int128.h: define struct Int128 according to the host endianness

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Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Matheus Ferst <matheus.ferst@eldorado.org.br>
Message-Id: <20210826141446.2488609-2-matheus.ferst@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Matheus Ferst 2021-08-26 11:14:45 -03:00 committed by David Gibson
parent dd4e4d1296
commit 181b0c333d
1 changed files with 20 additions and 7 deletions
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27
include/qemu/int128.h
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@ -162,24 +162,37 @@ static inline Int128 bswap128(Int128 a)
typedef struct Int128 Int128; typedef struct Int128 Int128;
/*
* We guarantee that the in-memory byte representation of an
* Int128 is that of a host-endian-order 128-bit integer
* (whether using this struct or the __int128_t version of the type).
* Some code using this type relies on this (eg when copying it into
* guest memory or a gdb protocol buffer, or by using Int128 in
* a union with other integer types).
*/
struct Int128 { struct Int128 {
#ifdef HOST_WORDS_BIGENDIAN
int64_t hi;
uint64_t lo;
#else
uint64_t lo; uint64_t lo;
int64_t hi; int64_t hi;
#endif
}; };
static inline Int128 int128_make64(uint64_t a) static inline Int128 int128_make64(uint64_t a)
{ {
return (Int128) { a, 0 }; return (Int128) { .lo = a, .hi = 0 };
} }
static inline Int128 int128_makes64(int64_t a) static inline Int128 int128_makes64(int64_t a)
{ {
return (Int128) { a, a >> 63 }; return (Int128) { .lo = a, .hi = a >> 63 };
} }
static inline Int128 int128_make128(uint64_t lo, uint64_t hi) static inline Int128 int128_make128(uint64_t lo, uint64_t hi)
{ {
return (Int128) { lo, hi }; return (Int128) { .lo = lo, .hi = hi };
} }
static inline uint64_t int128_get64(Int128 a) static inline uint64_t int128_get64(Int128 a)
@ -210,22 +223,22 @@ static inline Int128 int128_one(void)
static inline Int128 int128_2_64(void) static inline Int128 int128_2_64(void)
{ {
return (Int128) { 0, 1 }; return int128_make128(0, 1);
} }
static inline Int128 int128_exts64(int64_t a) static inline Int128 int128_exts64(int64_t a)
{ {
return (Int128) { .lo = a, .hi = (a < 0) ? -1 : 0 }; return int128_make128(a, (a < 0) ? -1 : 0);
} }
static inline Int128 int128_and(Int128 a, Int128 b) static inline Int128 int128_and(Int128 a, Int128 b)
{ {
return (Int128) { a.lo & b.lo, a.hi & b.hi }; return int128_make128(a.lo & b.lo, a.hi & b.hi);
} }
static inline Int128 int128_or(Int128 a, Int128 b) static inline Int128 int128_or(Int128 a, Int128 b)
{ {
return (Int128) { a.lo | b.lo, a.hi | b.hi }; return int128_make128(a.lo | b.lo, a.hi | b.hi);
} }
static inline Int128 int128_rshift(Int128 a, int n) static inline Int128 int128_rshift(Int128 a, int n)