diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/libdecnumber/decNumber.h | 4 | ||||
| -rw-r--r-- | include/libdecnumber/decNumberLocal.h | 2 | ||||
| -rw-r--r-- | include/qemu/host-utils.h | 36 |
3 files changed, 41 insertions, 1 deletions
diff --git a/include/libdecnumber/decNumber.h b/include/libdecnumber/decNumber.h index aa115fed07..41bc2a0d36 100644 --- a/include/libdecnumber/decNumber.h +++ b/include/libdecnumber/decNumber.h @@ -116,12 +116,16 @@ decNumber * decNumberFromUInt32(decNumber *, uint32_t); decNumber *decNumberFromInt64(decNumber *, int64_t); decNumber *decNumberFromUInt64(decNumber *, uint64_t); + decNumber *decNumberFromInt128(decNumber *, uint64_t, int64_t); + decNumber *decNumberFromUInt128(decNumber *, uint64_t, uint64_t); decNumber * decNumberFromString(decNumber *, const char *, decContext *); char * decNumberToString(const decNumber *, char *); char * decNumberToEngString(const decNumber *, char *); uint32_t decNumberToUInt32(const decNumber *, decContext *); int32_t decNumberToInt32(const decNumber *, decContext *); int64_t decNumberIntegralToInt64(const decNumber *dn, decContext *set); + void decNumberIntegralToInt128(const decNumber *dn, decContext *set, + uint64_t *plow, uint64_t *phigh); uint8_t * decNumberGetBCD(const decNumber *, uint8_t *); decNumber * decNumberSetBCD(decNumber *, const uint8_t *, uint32_t); diff --git a/include/libdecnumber/decNumberLocal.h b/include/libdecnumber/decNumberLocal.h index 4d53c077f2..6198ca8593 100644 --- a/include/libdecnumber/decNumberLocal.h +++ b/include/libdecnumber/decNumberLocal.h @@ -98,7 +98,7 @@ /* Shared lookup tables */ extern const uByte DECSTICKYTAB[10]; /* re-round digits if sticky */ - extern const uLong DECPOWERS[19]; /* powers of ten table */ + extern const uLong DECPOWERS[20]; /* powers of ten table */ /* The following are included from decDPD.h */ extern const uShort DPD2BIN[1024]; /* DPD -> 0-999 */ extern const uShort BIN2DPD[1000]; /* 0-999 -> DPD */ diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h index a3a7ced78d..ca979dc6cc 100644 --- a/include/qemu/host-utils.h +++ b/include/qemu/host-utils.h @@ -590,6 +590,42 @@ static inline bool umul64_overflow(uint64_t x, uint64_t y, uint64_t *ret) #endif } +/* + * Unsigned 128x64 multiplication. + * Returns true if the result got truncated to 128 bits. + * Otherwise, returns false and the multiplication result via plow and phigh. + */ +static inline bool mulu128(uint64_t *plow, uint64_t *phigh, uint64_t factor) +{ +#if defined(CONFIG_INT128) && \ + (__has_builtin(__builtin_mul_overflow) || __GNUC__ >= 5) + bool res; + __uint128_t r; + __uint128_t f = ((__uint128_t)*phigh << 64) | *plow; + res = __builtin_mul_overflow(f, factor, &r); + + *plow = r; + *phigh = r >> 64; + + return res; +#else + uint64_t dhi = *phigh; + uint64_t dlo = *plow; + uint64_t ahi; + uint64_t blo, bhi; + + if (dhi == 0) { + mulu64(plow, phigh, dlo, factor); + return false; + } + + mulu64(plow, &ahi, dlo, factor); + mulu64(&blo, &bhi, dhi, factor); + + return uadd64_overflow(ahi, blo, phigh) || bhi != 0; +#endif +} + /** * uadd64_carry - addition with carry-in and carry-out * @x, @y: addends |