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target/arm: Convert T16 add/sub (3 low, 2 low and imm)

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Backports commit c4d3095bb62bdac0b4f9cb180bd7aa0b40c2c270 from qemu
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Richard Henderson 2019-11-20 12:14:58 -05:00 committed by Lioncash
parent c52cfb9aa6
commit d9184b16a9
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GPG key ID: 4E3C3CC1031BA9C7
2 changed files with 18 additions and 24 deletions
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16
qemu/target/arm/t16.decode
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@ -117,3 +117,19 @@ ADD_rri 10101 rd:3 ........ \
STM 11000 ... ........ @ldstm
LDM_t16 11001 ... ........ @ldstm
# Add/subtract (three low registers)
@addsub_3 ....... rm:3 rn:3 rd:3 \
&s_rrr_shi %s shim=0 shty=0
ADD_rrri 0001100 ... ... ... @addsub_3
SUB_rrri 0001101 ... ... ... @addsub_3
# Add/subtract (two low registers and immediate)
@addsub_2i ....... imm:3 rn:3 rd:3 \
&s_rri_rot %s rot=0
ADD_rri 0001 110 ... ... ... @addsub_2i
SUB_rri 0001 111 ... ... ... @addsub_2i

26
qemu/target/arm/translate.c
View file

@ -11043,31 +11043,9 @@ static void disas_thumb_insn(DisasContext *s, uint32_t insn)
* 0b0001_1xxx_xxxx_xxxx
* - Add, subtract (three low registers)
* - Add, subtract (two low registers and immediate)
* In decodetree.
*/
rn = (insn >> 3) & 7;
tmp = load_reg(s, rn);
if (insn & (1 << 10)) {
/* immediate */
tmp2 = tcg_temp_new_i32(tcg_ctx);
tcg_gen_movi_i32(tcg_ctx, tmp2, (insn >> 6) & 7);
} else {
/* reg */
rm = (insn >> 6) & 7;
tmp2 = load_reg(s, rm);
}
if (insn & (1 << 9)) {
if (s->condexec_mask)
tcg_gen_sub_i32(tcg_ctx, tmp, tmp, tmp2);
else
gen_sub_CC(s, tmp, tmp, tmp2);
} else {
if (s->condexec_mask)
tcg_gen_add_i32(tcg_ctx, tmp, tmp, tmp2);
else
gen_add_CC(s, tmp, tmp, tmp2);
}
tcg_temp_free_i32(tcg_ctx, tmp2);
store_reg(s, rd, tmp);
goto illegal_op;
} else {
/* shift immediate */
rm = (insn >> 3) & 7;