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target-s390x: Use the new deposit and extract ops

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Use the new primitives for RISBG.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2016-10-17 14:50:31 -07:00
parent 7b4d326f47
commit f6156b8fb0
1 changed files with 22 additions and 12 deletions
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34
target/s390x/translate.c
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@ -3134,20 +3134,26 @@ static ExitStatus op_risbg(DisasContext *s, DisasOps *o)
}
}
/* 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;
}
len = i4 - i3 + 1;
pos = 63 - i4;
rot = i5 & 63;
if (s->fields->op2 == 0x5d) {
pos += 32;
}
/* In some cases we can implement this with extract. */
if (imask == 0 && pos == 0 && len > 0 && rot + len <= 64) {
tcg_gen_extract_i64(o->out, o->in2, rot, len);
return NO_EXIT;
}
/* In some cases we can implement this with deposit. */
if (len > 0 && (imask == 0 || ~mask == imask)) {
/* 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;
rot = (rot - pos) & 63;
} else {
pos = len = -1;
rot = i5 & 63;
pos = -1;
}
/* Rotate the input as necessary. */
@ -3155,7 +3161,11 @@ static ExitStatus op_risbg(DisasContext *s, DisasOps *o)
/* Insert the selected bits into the output. */
if (pos >= 0) {
tcg_gen_deposit_i64(o->out, o->out, o->in2, pos, len);
if (imask == 0) {
tcg_gen_deposit_z_i64(o->out, o->in2, pos, len);
} else {
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 {