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BSR/BSF TCG conversion

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4477 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-17 18:44:58 +00:00
parent 7c6ce4baed
commit 6191b05901
4 changed files with 54 additions and 72 deletions
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31
target-i386/helper.c
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@ -5240,6 +5240,37 @@ void helper_movq(uint64_t *d, uint64_t *s)
#endif
/* bit operations */
target_ulong helper_bsf(target_ulong t0)
{
int count;
target_ulong res;
res = t0;
count = 0;
while ((res & 1) == 0) {
count++;
res >>= 1;
}
return count;
}
target_ulong helper_bsr(target_ulong t0)
{
int count;
target_ulong res, mask;
res = t0;
count = TARGET_LONG_BITS - 1;
mask = (target_ulong)1 << (TARGET_LONG_BITS - 1);
while ((res & mask) == 0) {
count--;
res <<= 1;
}
return count;
}
static int compute_all_eflags(void)
{
return CC_SRC;