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target-arm: A64: add support for 1-src REV insns 

This adds support for C5.6.149 REV, C5.6.151 REV32, C5.6.150 REV16.

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 2013-12-17 19:42:35 +00:00 committed by Peter Maydell
parent 82e14b02a2
commit 453232096c
1 changed files with 72 additions and 1 deletions
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73
target-arm/translate-a64.c
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@ -1080,6 +1080,73 @@ static void handle_rbit(DisasContext *s, unsigned int sf,
}
}
/* C5.6.149 REV with sf==1, opcode==3 ("REV64") */
static void handle_rev64(DisasContext *s, unsigned int sf,
unsigned int rn, unsigned int rd)
{
if (!sf) {
unallocated_encoding(s);
return;
}
tcg_gen_bswap64_i64(cpu_reg(s, rd), cpu_reg(s, rn));
}
/* C5.6.149 REV with sf==0, opcode==2
* C5.6.151 REV32 (sf==1, opcode==2)
*/
static void handle_rev32(DisasContext *s, unsigned int sf,
unsigned int rn, unsigned int rd)
{
TCGv_i64 tcg_rd = cpu_reg(s, rd);
if (sf) {
TCGv_i64 tcg_tmp = tcg_temp_new_i64();
TCGv_i64 tcg_rn = read_cpu_reg(s, rn, sf);
/* bswap32_i64 requires zero high word */
tcg_gen_ext32u_i64(tcg_tmp, tcg_rn);
tcg_gen_bswap32_i64(tcg_rd, tcg_tmp);
tcg_gen_shri_i64(tcg_tmp, tcg_rn, 32);
tcg_gen_bswap32_i64(tcg_tmp, tcg_tmp);
tcg_gen_concat32_i64(tcg_rd, tcg_rd, tcg_tmp);
tcg_temp_free_i64(tcg_tmp);
} else {
tcg_gen_ext32u_i64(tcg_rd, cpu_reg(s, rn));
tcg_gen_bswap32_i64(tcg_rd, tcg_rd);
}
}
/* C5.6.150 REV16 (opcode==1) */
static void handle_rev16(DisasContext *s, unsigned int sf,
unsigned int rn, unsigned int rd)
{
TCGv_i64 tcg_rd = cpu_reg(s, rd);
TCGv_i64 tcg_tmp = tcg_temp_new_i64();
TCGv_i64 tcg_rn = read_cpu_reg(s, rn, sf);
tcg_gen_andi_i64(tcg_tmp, tcg_rn, 0xffff);
tcg_gen_bswap16_i64(tcg_rd, tcg_tmp);
tcg_gen_shri_i64(tcg_tmp, tcg_rn, 16);
tcg_gen_andi_i64(tcg_tmp, tcg_tmp, 0xffff);
tcg_gen_bswap16_i64(tcg_tmp, tcg_tmp);
tcg_gen_deposit_i64(tcg_rd, tcg_rd, tcg_tmp, 16, 16);
if (sf) {
tcg_gen_shri_i64(tcg_tmp, tcg_rn, 32);
tcg_gen_andi_i64(tcg_tmp, tcg_tmp, 0xffff);
tcg_gen_bswap16_i64(tcg_tmp, tcg_tmp);
tcg_gen_deposit_i64(tcg_rd, tcg_rd, tcg_tmp, 32, 16);
tcg_gen_shri_i64(tcg_tmp, tcg_rn, 48);
tcg_gen_bswap16_i64(tcg_tmp, tcg_tmp);
tcg_gen_deposit_i64(tcg_rd, tcg_rd, tcg_tmp, 48, 16);
}
tcg_temp_free_i64(tcg_tmp);
}
/* C3.5.7 Data-processing (1 source)
* 31 30 29 28 21 20 16 15 10 9 5 4 0
* +----+---+---+-----------------+---------+--------+------+------+
@ -1105,9 +1172,13 @@ static void disas_data_proc_1src(DisasContext *s, uint32_t insn)
handle_rbit(s, sf, rn, rd);
break;
case 1: /* REV16 */
handle_rev16(s, sf, rn, rd);
break;
case 2: /* REV32 */
handle_rev32(s, sf, rn, rd);
break;
case 3: /* REV64 */
unsupported_encoding(s, insn);
handle_rev64(s, sf, rn, rd);
break;
case 4: /* CLZ */
handle_clz(s, sf, rn, rd);