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target-arm: A64: Add support for floating point conditional compare 

This adds decoding support for C3.6.23 FP Conditional Compare.

Signed-off-by: Claudio Fontana <claudio.fontana@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Claudio Fontana 2014-01-04 22:15:51 +00:00 committed by Peter Maydell
parent da7dafe7ee
commit 513f1d762f
1 changed files with 34 additions and 1 deletions
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35
target-arm/translate-a64.c
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@ -3268,7 +3268,40 @@ static void disas_fp_compare(DisasContext *s, uint32_t insn)
*/
static void disas_fp_ccomp(DisasContext *s, uint32_t insn)
{
unsupported_encoding(s, insn);
unsigned int mos, type, rm, cond, rn, op, nzcv;
TCGv_i64 tcg_flags;
int label_continue = -1;
mos = extract32(insn, 29, 3);
type = extract32(insn, 22, 2); /* 0 = single, 1 = double */
rm = extract32(insn, 16, 5);
cond = extract32(insn, 12, 4);
rn = extract32(insn, 5, 5);
op = extract32(insn, 4, 1);
nzcv = extract32(insn, 0, 4);
if (mos || type > 1) {
unallocated_encoding(s);
return;
}
if (cond < 0x0e) { /* not always */
int label_match = gen_new_label();
label_continue = gen_new_label();
arm_gen_test_cc(cond, label_match);
/* nomatch: */
tcg_flags = tcg_const_i64(nzcv << 28);
gen_set_nzcv(tcg_flags);
tcg_temp_free_i64(tcg_flags);
tcg_gen_br(label_continue);
gen_set_label(label_match);
}
handle_fp_compare(s, type, rn, rm, false, op);
if (cond < 0x0e) {
gen_set_label(label_continue);
}
}
/* C3.6.24 Floating point conditional select