diff options
| author | aurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-01-04 22:11:59 +0000 |
|---|---|---|
| committer | aurel32 <aurel32@c046a42c-6fe2-441c-8c8c-71466251a162> | 2009-01-04 22:11:59 +0000 |
| commit | 00d3b8f59bb58e4c7ae52fc73d55d2f27e664443 (patch) | |
| tree | f5170696e9068a7d8b6c49255337ad7aec0f7d3b /target-ppc | |
| parent | d1258698f5c295a2c34258ea6bcf406794ff6e95 (diff) | |
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
Diffstat (limited to 'target-ppc')
| -rw-r--r-- | target-ppc/op_helper.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c index 87ae2ca4eb..869878f7f5 100644 --- a/target-ppc/op_helper.c +++ b/target-ppc/op_helper.c @@ -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); |