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P4 style multiplication eflags

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@481 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2003-12-02 22:01:31 +00:00
parent 5e809a8095
commit d36cd60e6c
4 changed files with 49 additions and 24 deletions
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23
target-i386/ops_template.h
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@ -229,6 +229,29 @@ static int glue(compute_all_sar, SUFFIX)(void)
return cf | pf | af | zf | sf | of;
}
#if DATA_BITS == 32
static int glue(compute_c_mul, SUFFIX)(void)
{
int cf;
cf = (CC_SRC != 0);
return cf;
}
#endif
/* NOTE: we compute the flags like the P4. On olders CPUs, only OF and
CF are modified and it is slower to do that. */
static int glue(compute_all_mul, SUFFIX)(void)
{
int cf, pf, af, zf, sf, of;
cf = (CC_SRC != 0);
pf = parity_table[(uint8_t)CC_DST];
af = 0; /* undefined */
zf = ((DATA_TYPE)CC_DST == 0) << 6;
sf = lshift(CC_DST, 8 - DATA_BITS) & 0x80;
of = cf << 11;
return cf | pf | af | zf | sf | of;
}
/* various optimized jumps cases */
void OPPROTO glue(op_jb_sub, SUFFIX)(void)