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target-ppc: Add ISA2.06 divdeu[o] Instructions

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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>
This commit is contained in:
Tom Musta 2014-01-07 10:05:51 -06:00 • committed by Alexander Graf
parent a824bc191a
commit 98d1eb2748
5 changed files with 101 additions and 0 deletions
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14
include/qemu/host-utils.h
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@ -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
/**