From 727385c4e13e1a5a985124a20a2370855141111d Mon Sep 17 00:00:00 2001 From: Luis Pires Date: Fri, 29 Oct 2021 16:24:03 -0300 Subject: libdecnumber: introduce decNumberFrom[U]Int128 This will be used to implement PowerPC's dcffixqq. Signed-off-by: Luis Pires Reviewed-by: Richard Henderson Message-Id: <20211029192417.400707-2-luis.pires@eldorado.org.br> Signed-off-by: David Gibson --- include/libdecnumber/decNumber.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include') diff --git a/include/libdecnumber/decNumber.h b/include/libdecnumber/decNumber.h index aa115fe..0cf69c7 100644 --- a/include/libdecnumber/decNumber.h +++ b/include/libdecnumber/decNumber.h @@ -116,6 +116,8 @@ 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 *); -- cgit v1.1 From e06049f38074b9533c4beef37d634dad3bd97c73 Mon Sep 17 00:00:00 2001 From: Luis Pires Date: Fri, 29 Oct 2021 16:24:07 -0300 Subject: host-utils: Introduce mulu128 Signed-off-by: Luis Pires Reviewed-by: Richard Henderson Message-Id: <20211029192417.400707-6-luis.pires@eldorado.org.br> Signed-off-by: David Gibson --- include/qemu/host-utils.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) (limited to 'include') diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h index a3a7ced7..ca979dc 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 -- cgit v1.1 From 21d7826fdbf13bc3180f8f23f3f87967604fdf7e Mon Sep 17 00:00:00 2001 From: Luis Pires Date: Fri, 29 Oct 2021 16:24:08 -0300 Subject: libdecnumber: Introduce decNumberIntegralToInt128 This will be used to implement PowerPC's dctfixqq. Signed-off-by: Luis Pires Reviewed-by: Richard Henderson Message-Id: <20211029192417.400707-7-luis.pires@eldorado.org.br> Signed-off-by: David Gibson --- include/libdecnumber/decNumber.h | 2 ++ include/libdecnumber/decNumberLocal.h | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/libdecnumber/decNumber.h b/include/libdecnumber/decNumber.h index 0cf69c7..41bc2a0 100644 --- a/include/libdecnumber/decNumber.h +++ b/include/libdecnumber/decNumber.h @@ -124,6 +124,8 @@ 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 4d53c07..6198ca8 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 */ -- cgit v1.1