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target-ppc: Add ISA 2.06 divwe[o] Instructions

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This patch addes the signed Divide Word Extended instructions
which were introduced in Power ISA 2.06B.

Signed-off-by: Tom Musta <tommusta@gmail.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Tom Musta 2014-01-07 10:05:54 -06:00 • committed by Alexander Graf
parent 6a4fda3358
commit a98eb9e99d
3 changed files with 37 additions and 0 deletions
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32
target-ppc/int_helper.c
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@ -72,6 +72,38 @@ target_ulong helper_divweu(CPUPPCState *env, target_ulong ra, target_ulong rb,
return (target_ulong)rt;
}
target_ulong helper_divwe(CPUPPCState *env, target_ulong ra, target_ulong rb,
uint32_t oe)
{
int64_t rt = 0;
int overflow = 0;
int64_t dividend = (int64_t)ra << 32;
int64_t divisor = (int64_t)((int32_t)rb);
if (unlikely((divisor == 0) ||
((divisor == -1ull) && (dividend == INT64_MIN)))) {
overflow = 1;
} else {
rt = dividend / divisor;
overflow = rt != (int32_t)rt;
}
if (unlikely(overflow)) {
rt = 0; /* Undefined */
}
if (oe) {
if (unlikely(overflow)) {
env->so = env->ov = 1;
} else {
env->ov = 0;
}
}
return (target_ulong)rt;
}
#if defined(TARGET_PPC64)
uint64_t helper_divdeu(CPUPPCState *env, uint64_t ra, uint64_t rb, uint32_t oe)