diff options
Diffstat (limited to 'target-ppc/op_helper.c')
| -rw-r--r-- | target-ppc/op_helper.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c index eb155aa50f..55c9c56538 100644 --- a/target-ppc/op_helper.c +++ b/target-ppc/op_helper.c @@ -2452,6 +2452,45 @@ void helper_vsel (ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b, ppc_avr_t *c) r->u64[1] = (a->u64[1] & ~c->u64[1]) | (b->u64[1] & c->u64[1]); } +#if defined(WORDS_BIGENDIAN) +#define LEFT 0 +#define RIGHT 1 +#else +#define LEFT 1 +#define RIGHT 0 +#endif +/* The specification says that the results are undefined if all of the + * shift counts are not identical. We check to make sure that they are + * to conform to what real hardware appears to do. */ +#define VSHIFT(suffix, leftp) \ + void helper_vs##suffix (ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b) \ + { \ + int shift = b->u8[LO_IDX*0x15] & 0x7; \ + int doit = 1; \ + int i; \ + for (i = 0; i < ARRAY_SIZE(r->u8); i++) { \ + doit = doit && ((b->u8[i] & 0x7) == shift); \ + } \ + if (doit) { \ + if (shift == 0) { \ + *r = *a; \ + } else if (leftp) { \ + uint64_t carry = a->u64[LO_IDX] >> (64 - shift); \ + r->u64[HI_IDX] = (a->u64[HI_IDX] << shift) | carry; \ + r->u64[LO_IDX] = a->u64[LO_IDX] << shift; \ + } else { \ + uint64_t carry = a->u64[HI_IDX] << (64 - shift); \ + r->u64[LO_IDX] = (a->u64[LO_IDX] >> shift) | carry; \ + r->u64[HI_IDX] = a->u64[HI_IDX] >> shift; \ + } \ + } \ + } +VSHIFT(l, LEFT) +VSHIFT(r, RIGHT) +#undef VSHIFT +#undef LEFT +#undef RIGHT + #define VSL(suffix, element) \ void helper_vsl##suffix (ppc_avr_t *r, ppc_avr_t *a, ppc_avr_t *b) \ { \ |