From b8ed4046e325959cf600000b1172d6bca34bd132 Mon Sep 17 00:00:00 2001 From: Claudio Fontana Date: Wed, 18 Dec 2013 13:55:40 +0100 Subject: target-arm: A64: Add support for floating point cond select This adds decoding support for C3.6.24 FP conditional select. Signed-off-by: Claudio Fontana Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- target-arm/translate-a64.c | 45 ++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 44 insertions(+), 1 deletion(-) diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c index 44d8a09c4d..c9fbf0f0f7 100644 --- a/target-arm/translate-a64.c +++ b/target-arm/translate-a64.c @@ -3304,6 +3304,20 @@ static void disas_fp_ccomp(DisasContext *s, uint32_t insn) } } +/* copy src FP register to dst FP register; type specifies single or double */ +static void gen_mov_fp2fp(DisasContext *s, int type, int dst, int src) +{ + if (type) { + TCGv_i64 v = read_fp_dreg(s, src); + write_fp_dreg(s, dst, v); + tcg_temp_free_i64(v); + } else { + TCGv_i32 v = read_fp_sreg(s, src); + write_fp_sreg(s, dst, v); + tcg_temp_free_i32(v); + } +} + /* C3.6.24 Floating point conditional select * 31 30 29 28 24 23 22 21 20 16 15 12 11 10 9 5 4 0 * +---+---+---+-----------+------+---+------+------+-----+------+------+ @@ -3312,7 +3326,36 @@ static void disas_fp_ccomp(DisasContext *s, uint32_t insn) */ static void disas_fp_csel(DisasContext *s, uint32_t insn) { - unsupported_encoding(s, insn); + unsigned int mos, type, rm, cond, rn, rd; + 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); + rd = extract32(insn, 0, 5); + + 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: */ + gen_mov_fp2fp(s, type, rd, rm); + tcg_gen_br(label_continue); + gen_set_label(label_match); + } + + gen_mov_fp2fp(s, type, rd, rn); + + if (cond < 0x0e) { /* continue */ + gen_set_label(label_continue); + } } /* C3.6.25 Floating point data-processing (1 source) -- cgit v1.2.3