diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2014-01-31 14:47:32 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2014-01-31 14:47:32 +0000 |
| commit | 360a6f2dbde39211107620a3d38b8cc8cc5281ee (patch) | |
| tree | 6f89269b8f4f691ef7b9a5e5d1ed7619af6d0b17 /target-arm | |
| parent | f3f8c4f4d2fc7dda192393f998e63c7a83fb7554 (diff) | |
target-arm: A64: Add SIMD scalar copy instructions
Add support for the SIMD scalar copy instruction group (C3.6.7),
which consists of the single instruction DUP (element, scalar).
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-arm')
| -rw-r--r-- | target-arm/translate-a64.c | 43 |
1 files changed, 42 insertions, 1 deletions
diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c index 69c75c0000..7cfb55bdc6 100644 --- a/target-arm/translate-a64.c +++ b/target-arm/translate-a64.c @@ -5108,6 +5108,35 @@ static void handle_simd_dupe(DisasContext *s, int is_q, int rd, int rn, tcg_temp_free_i64(tmp); } +/* C6.3.31 DUP (element, scalar) + * 31 21 20 16 15 10 9 5 4 0 + * +-----------------------+--------+-------------+------+------+ + * | 0 1 0 1 1 1 1 0 0 0 0 | imm5 | 0 0 0 0 0 1 | Rn | Rd | + * +-----------------------+--------+-------------+------+------+ + */ +static void handle_simd_dupes(DisasContext *s, int rd, int rn, + int imm5) +{ + int size = ctz32(imm5); + int index; + TCGv_i64 tmp; + + if (size > 3) { + unallocated_encoding(s); + return; + } + + index = imm5 >> (size + 1); + + /* This instruction just extracts the specified element and + * zero-extends it into the bottom of the destination register. + */ + tmp = tcg_temp_new_i64(); + read_vec_element(s, tmp, rn, index, size); + write_fp_dreg(s, rd, tmp); + tcg_temp_free_i64(tmp); +} + /* C6.3.32 DUP (General) * * 31 30 29 21 20 16 15 10 9 5 4 0 @@ -5425,7 +5454,19 @@ static void disas_simd_mod_imm(DisasContext *s, uint32_t insn) */ static void disas_simd_scalar_copy(DisasContext *s, uint32_t insn) { - unsupported_encoding(s, insn); + int rd = extract32(insn, 0, 5); + int rn = extract32(insn, 5, 5); + int imm4 = extract32(insn, 11, 4); + int imm5 = extract32(insn, 16, 5); + int op = extract32(insn, 29, 1); + + if (op != 0 || imm4 != 0) { + unallocated_encoding(s); + return; + } + + /* DUP (element, scalar) */ + handle_simd_dupes(s, rd, rn, imm5); } /* C3.6.8 AdvSIMD scalar pairwise |