diff options
Diffstat (limited to 'target-s390x')
| -rw-r--r-- | target-s390x/insn-data.def | 5 | ||||
| -rw-r--r-- | target-s390x/translate.c | 83 |
2 files changed, 88 insertions, 0 deletions
diff --git a/target-s390x/insn-data.def b/target-s390x/insn-data.def index 4478d1c8cf..c80a386c32 100644 --- a/target-s390x/insn-data.def +++ b/target-s390x/insn-data.def @@ -500,6 +500,11 @@ C(0xeb1d, RLL, RSY_a, Z, r3_o, sh32, new, r1_32, rll32, 0) C(0xeb1c, RLLG, RSY_a, Z, r3_o, sh64, r1, 0, rll64, 0) +/* ROTATE THEN INSERT SELECTED BITS */ + C(0xec55, RISBG, RIE_f, GIE, 0, r2, r1, 0, risbg, s64) + C(0xec5d, RISBHG, RIE_f, GIE, 0, r2, r1, 0, risbg, 0) + C(0xec51, RISBLG, RIE_f, GIE, 0, r2, r1, 0, risbg, 0) + /* SEARCH STRING */ C(0xb25e, SRST, RRE, Z, r1_o, r2_o, 0, 0, srst, 0) diff --git a/target-s390x/translate.c b/target-s390x/translate.c index d6f7121a2e..1f8659f4db 100644 --- a/target-s390x/translate.c +++ b/target-s390x/translate.c @@ -2429,6 +2429,89 @@ static ExitStatus op_ptlb(DisasContext *s, DisasOps *o) } #endif +static ExitStatus op_risbg(DisasContext *s, DisasOps *o) +{ + int i3 = get_field(s->fields, i3); + int i4 = get_field(s->fields, i4); + int i5 = get_field(s->fields, i5); + int do_zero = i4 & 0x80; + uint64_t mask, imask, pmask; + int pos, len, rot; + + /* Adjust the arguments for the specific insn. */ + switch (s->fields->op2) { + case 0x55: /* risbg */ + i3 &= 63; + i4 &= 63; + pmask = ~0; + break; + case 0x5d: /* risbhg */ + i3 &= 31; + i4 &= 31; + pmask = 0xffffffff00000000ull; + break; + case 0x51: /* risblg */ + i3 &= 31; + i4 &= 31; + pmask = 0x00000000ffffffffull; + break; + default: + abort(); + } + + /* MASK is the set of bits to be inserted from R2. + Take care for I3/I4 wraparound. */ + mask = pmask >> i3; + if (i3 <= i4) { + mask ^= pmask >> i4 >> 1; + } else { + mask |= ~(pmask >> i4 >> 1); + } + mask &= pmask; + + /* IMASK is the set of bits to be kept from R1. In the case of the high/low + insns, we need to keep the other half of the register. */ + imask = ~mask | ~pmask; + if (do_zero) { + if (s->fields->op2 == 0x55) { + imask = 0; + } else { + imask = ~pmask; + } + } + + /* In some cases we can implement this with deposit, which can be more + efficient on some hosts. */ + if (~mask == imask && i3 <= i4) { + if (s->fields->op2 == 0x5d) { + i3 += 32, i4 += 32; + } + /* Note that we rotate the bits to be inserted to the lsb, not to + the position as described in the PoO. */ + len = i4 - i3 + 1; + pos = 63 - i4; + rot = (i5 - pos) & 63; + } else { + pos = len = -1; + rot = i5 & 63; + } + + /* Rotate the input as necessary. */ + tcg_gen_rotli_i64(o->in2, o->in2, rot); + + /* Insert the selected bits into the output. */ + if (pos >= 0) { + tcg_gen_deposit_i64(o->out, o->out, o->in2, pos, len); + } else if (imask == 0) { + tcg_gen_andi_i64(o->out, o->in2, mask); + } else { + tcg_gen_andi_i64(o->in2, o->in2, mask); + tcg_gen_andi_i64(o->out, o->out, imask); + tcg_gen_or_i64(o->out, o->out, o->in2); + } + return NO_EXIT; +} + static ExitStatus op_rev16(DisasContext *s, DisasOps *o) { tcg_gen_bswap16_i64(o->out, o->in2); |