mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

target-arm: A64: add support for 3 src data proc insns

Browse Source 
This patch adds emulation for the "Data-processing (3 source)"
family of instructions, namely MADD, MSUB, SMADDL, SMSUBL, SMULH,
UMADDL, UMSUBL, UMULH.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Alexander Graf 2013-12-23 23:27:30 +00:00 committed by Peter Maydell
parent ed6ec679a8
commit 52c8b9afcd
1 changed files with 95 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

97
target-arm/translate-a64.c
View File

@ -2128,10 +2128,103 @@ static void disas_add_sub_reg(DisasContext *s, uint32_t insn)
tcg_temp_free_i64(tcg_result);
}
/* Data-processing (3 source) */
/* C3.5.9 Data-processing (3 source)
31 30 29 28 24 23 21 20 16 15 14 10 9 5 4 0
+--+------+-----------+------+------+----+------+------+------+
|sf| op54 | 1 1 0 1 1 | op31 | Rm | o0 | Ra | Rn | Rd |
+--+------+-----------+------+------+----+------+------+------+
*/
static void disas_data_proc_3src(DisasContext *s, uint32_t insn)
{
unsupported_encoding(s, insn);
int rd = extract32(insn, 0, 5);
int rn = extract32(insn, 5, 5);
int ra = extract32(insn, 10, 5);
int rm = extract32(insn, 16, 5);
int op_id = (extract32(insn, 29, 3) << 4) |
(extract32(insn, 21, 3) << 1) |
extract32(insn, 15, 1);
bool sf = extract32(insn, 31, 1);
bool is_sub = extract32(op_id, 0, 1);
bool is_high = extract32(op_id, 2, 1);
bool is_signed = false;
TCGv_i64 tcg_op1;
TCGv_i64 tcg_op2;
TCGv_i64 tcg_tmp;
/* Note that op_id is sf:op54:op31:o0 so it includes the 32/64 size flag */
switch (op_id) {
case 0x42: /* SMADDL */
case 0x43: /* SMSUBL */
case 0x44: /* SMULH */
is_signed = true;
break;
case 0x0: /* MADD (32bit) */
case 0x1: /* MSUB (32bit) */
case 0x40: /* MADD (64bit) */
case 0x41: /* MSUB (64bit) */
case 0x4a: /* UMADDL */
case 0x4b: /* UMSUBL */
case 0x4c: /* UMULH */
break;
default:
unallocated_encoding(s);
return;
}
if (is_high) {
TCGv_i64 low_bits = tcg_temp_new_i64(); /* low bits discarded */
TCGv_i64 tcg_rd = cpu_reg(s, rd);
TCGv_i64 tcg_rn = cpu_reg(s, rn);
TCGv_i64 tcg_rm = cpu_reg(s, rm);
if (is_signed) {
tcg_gen_muls2_i64(low_bits, tcg_rd, tcg_rn, tcg_rm);
} else {
tcg_gen_mulu2_i64(low_bits, tcg_rd, tcg_rn, tcg_rm);
}
tcg_temp_free_i64(low_bits);
return;
}
tcg_op1 = tcg_temp_new_i64();
tcg_op2 = tcg_temp_new_i64();
tcg_tmp = tcg_temp_new_i64();
if (op_id < 0x42) {
tcg_gen_mov_i64(tcg_op1, cpu_reg(s, rn));
tcg_gen_mov_i64(tcg_op2, cpu_reg(s, rm));
} else {
if (is_signed) {
tcg_gen_ext32s_i64(tcg_op1, cpu_reg(s, rn));
tcg_gen_ext32s_i64(tcg_op2, cpu_reg(s, rm));
} else {
tcg_gen_ext32u_i64(tcg_op1, cpu_reg(s, rn));
tcg_gen_ext32u_i64(tcg_op2, cpu_reg(s, rm));
}
}
if (ra == 31 && !is_sub) {
/* Special-case MADD with rA == XZR; it is the standard MUL alias */
tcg_gen_mul_i64(cpu_reg(s, rd), tcg_op1, tcg_op2);
} else {
tcg_gen_mul_i64(tcg_tmp, tcg_op1, tcg_op2);
if (is_sub) {
tcg_gen_sub_i64(cpu_reg(s, rd), cpu_reg(s, ra), tcg_tmp);
} else {
tcg_gen_add_i64(cpu_reg(s, rd), cpu_reg(s, ra), tcg_tmp);
}
}
if (!sf) {
tcg_gen_ext32u_i64(cpu_reg(s, rd), cpu_reg(s, rd));
}
tcg_temp_free_i64(tcg_op1);
tcg_temp_free_i64(tcg_op2);
tcg_temp_free_i64(tcg_tmp);
}
/* Add/subtract (with carry) */