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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>
master
Peter Maydell 2014-01-31 14:47:32 +00:00
parent f3f8c4f4d2
commit 360a6f2dbd
1 changed files with 42 additions and 1 deletions
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43
target-arm/translate-a64.c
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@ -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