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target-ppc: Split out SO, OV, CA fields from XER

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In preparation for more efficient setting of these fields.

Cc: Alexander Graf <agraf@suse.de>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2013-02-19 23:52:13 -08:00 • committed by Blue Swirl
parent 23ad1d5d3c
commit da91a00f19
6 changed files with 160 additions and 106 deletions
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38
target-ppc/int_helper.c
View file

@ -33,9 +33,9 @@ uint64_t helper_mulldo(CPUPPCState *env, uint64_t arg1, uint64_t arg2)
muls64(&tl, (uint64_t *)&th, arg1, arg2);
/* If th != 0 && th != -1, then we had an overflow */
if (likely((uint64_t)(th + 1) <= 1)) {
env->xer &= ~(1 << XER_OV);
env->ov = 0;
} else {
env->xer |= (1 << XER_OV) | (1 << XER_SO);
env->so = env->ov = 1;
}
return (int64_t)tl;
}
@ -64,21 +64,17 @@ target_ulong helper_sraw(CPUPPCState *env, target_ulong value,
shift &= 0x1f;
ret = (int32_t)value >> shift;
if (likely(ret >= 0 || (value & ((1 << shift) - 1)) == 0)) {
env->xer &= ~(1 << XER_CA);
env->ca = 0;
} else {
env->xer |= (1 << XER_CA);
env->ca = 1;
}
} else {
ret = (int32_t)value;
env->xer &= ~(1 << XER_CA);
env->ca = 0;
}
} else {
ret = (int32_t)value >> 31;
if (ret) {
env->xer |= (1 << XER_CA);
} else {
env->xer &= ~(1 << XER_CA);
}
env->ca = (ret != 0);
}
return (target_long)ret;
}
@ -94,21 +90,17 @@ target_ulong helper_srad(CPUPPCState *env, target_ulong value,
shift &= 0x3f;
ret = (int64_t)value >> shift;
if (likely(ret >= 0 || (value & ((1 << shift) - 1)) == 0)) {
env->xer &= ~(1 << XER_CA);
env->ca = 0;
} else {
env->xer |= (1 << XER_CA);
env->ca = 1;
}
} else {
ret = (int64_t)value;
env->xer &= ~(1 << XER_CA);
env->ca = 0;
}
} else {
ret = (int64_t)value >> 63;
if (ret) {
env->xer |= (1 << XER_CA);
} else {
env->xer &= ~(1 << XER_CA);
}
env->ca = (ret != 0);
}
return ret;
}
@ -188,16 +180,16 @@ target_ulong helper_divo(CPUPPCState *env, target_ulong arg1,
if (((int32_t)tmp == INT32_MIN && (int32_t)arg2 == (int32_t)-1) ||
(int32_t)arg2 == 0) {
env->xer |= (1 << XER_OV) | (1 << XER_SO);
env->so = env->ov = 1;
env->spr[SPR_MQ] = 0;
return INT32_MIN;
} else {
env->spr[SPR_MQ] = tmp % arg2;
tmp /= (int32_t)arg2;
if ((int32_t)tmp != tmp) {
env->xer |= (1 << XER_OV) | (1 << XER_SO);
env->so = env->ov = 1;
} else {
env->xer &= ~(1 << XER_OV);
env->ov = 0;
}
return tmp;
}
@ -221,11 +213,11 @@ target_ulong helper_divso(CPUPPCState *env, target_ulong arg1,
{
if (((int32_t)arg1 == INT32_MIN && (int32_t)arg2 == (int32_t)-1) ||
(int32_t)arg2 == 0) {
env->xer |= (1 << XER_OV) | (1 << XER_SO);
env->so = env->ov = 1;
env->spr[SPR_MQ] = 0;
return INT32_MIN;
} else {
env->xer &= ~(1 << XER_OV);
env->ov = 0;
env->spr[SPR_MQ] = (int32_t)arg1 % (int32_t)arg2;
return (int32_t)arg1 / (int32_t)arg2;
}