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| author | Tom Musta <tommusta@gmail.com> | 2014-01-07 10:05:51 -0600 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-03-05 03:06:39 +0100 |
| commit | 98d1eb2748e84f9e3118d1bd2495f0cc917ac18d (patch) | |
| tree | 7768c567eff4633cb49b55878c29dc4580dc45de /include/qemu/host-utils.h | |
| parent | a824bc191a90d86980a9ed090cb1d1219faaf8e7 (diff) | |
| download | focaccia-qemu-98d1eb2748e84f9e3118d1bd2495f0cc917ac18d.tar.gz focaccia-qemu-98d1eb2748e84f9e3118d1bd2495f0cc917ac18d.zip | |
target-ppc: Add ISA2.06 divdeu[o] Instructions
This patch adds the Divide Doubleword Extended Unsigned instructions. This instruction requires dividing a 128-bit value by a 64 bit value. Since 128 bit integer division is not supported in TCG, a helper is used. An architecture independent 128-bit division routine is added to host-utils. Signed-off-by: Tom Musta <tommusta@gmail.com> Reviewed-by: Richard Henderson <rth@twiddle.net> [agraf: use ||] Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'include/qemu/host-utils.h')
| -rw-r--r-- | include/qemu/host-utils.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h index 285c5fbab8..402b53f39e 100644 --- a/include/qemu/host-utils.h +++ b/include/qemu/host-utils.h @@ -44,9 +44,23 @@ static inline void muls64(uint64_t *plow, uint64_t *phigh, *plow = r; *phigh = r >> 64; } + +static inline int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor) +{ + if (divisor == 0) { + return 1; + } else { + __uint128_t dividend = ((__uint128_t)*phigh << 64) | *plow; + __uint128_t result = dividend / divisor; + *plow = result; + *phigh = dividend % divisor; + return result > UINT64_MAX; + } +} #else void muls64(uint64_t *phigh, uint64_t *plow, int64_t a, int64_t b); void mulu64(uint64_t *phigh, uint64_t *plow, uint64_t a, uint64_t b); +int divu128(uint64_t *plow, uint64_t *phigh, uint64_t divisor); #endif /** |