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Add saturating arithmetic conversion functions for subsequent instructions. 

Signed-off-by: Nathan Froyd <froydnj@codesourcery.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6181 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2009-01-04 22:11:59 +00:00
parent d1258698f5
commit 00d3b8f59b
1 changed files with 27 additions and 0 deletions
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27
target-ppc/op_helper.c
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@ -1972,6 +1972,33 @@ target_ulong helper_dlmzb (target_ulong high, target_ulong low, uint32_t update_
for (index = ARRAY_SIZE(r->element)-1; index >= 0; index--)
#endif
/* Saturating arithmetic helpers. */
#define SATCVT(from, to, from_type, to_type, min, max, use_min, use_max) \
static always_inline to_type cvt##from##to (from_type x, int *sat) \
{ \
to_type r; \
if (use_min && x < min) { \
r = min; \
*sat = 1; \
} else if (use_max && x > max) { \
r = max; \
*sat = 1; \
} else { \
r = x; \
} \
return r; \
}
SATCVT(sh, sb, int16_t, int8_t, INT8_MIN, INT8_MAX, 1, 1)
SATCVT(sw, sh, int32_t, int16_t, INT16_MIN, INT16_MAX, 1, 1)
SATCVT(sd, sw, int64_t, int32_t, INT32_MIN, INT32_MAX, 1, 1)
SATCVT(uh, ub, uint16_t, uint8_t, 0, UINT8_MAX, 0, 1)
SATCVT(uw, uh, uint32_t, uint16_t, 0, UINT16_MAX, 0, 1)
SATCVT(ud, uw, uint64_t, uint32_t, 0, UINT32_MAX, 0, 1)
SATCVT(sh, ub, int16_t, uint8_t, 0, UINT8_MAX, 1, 1)
SATCVT(sw, uh, int32_t, uint16_t, 0, UINT16_MAX, 1, 1)
SATCVT(sd, uw, int64_t, uint32_t, 0, UINT32_MAX, 1, 1)
#undef SATCVT
void helper_lvsl (ppc_avr_t *r, target_ulong sh)
{
int i, j = (sh & 0xf);