SYS-OSS/FRET-qemu
4
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

target/arm: Convert RMIF to decodetree

Browse Source 
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20241211163036.2297116-17-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2024-12-11 10:29:43 -06:00 committed by Peter Maydell
parent eeb4a51962
commit 9fa4829be6
2 changed files with 12 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
target/arm/tcg/a64.decode
View File

@ -753,6 +753,9 @@ SBC . 10 11010000 ..... 000000 ..... ..... @rrr_sf
SBCS . 11 11010000 ..... 000000 ..... ..... @rrr_sf
# Rotate right into flags
RMIF 1 01 11010000 imm:6 00001 rn:5 0 mask:4
# Evaluate into flags
# Conditional compare (regster)
# Conditional compare (immediate)

32
target/arm/tcg/translate-a64.c
View File

@ -8045,30 +8045,18 @@ TRANS(SBC, do_adc_sbc, a, true, false)
TRANS(ADCS, do_adc_sbc, a, false, true)
TRANS(SBCS, do_adc_sbc, a, true, true)
/*
* Rotate right into flags
* 31 30 29 21 15 10 5 4 0
* +--+--+--+-----------------+--------+-----------+------+--+------+
* |sf|op| S| 1 1 0 1 0 0 0 0 | imm6 | 0 0 0 0 1 | Rn |o2| mask |
* +--+--+--+-----------------+--------+-----------+------+--+------+
*/
static void disas_rotate_right_into_flags(DisasContext *s, uint32_t insn)
static bool trans_RMIF(DisasContext *s, arg_RMIF *a)
{
int mask = extract32(insn, 0, 4);
int o2 = extract32(insn, 4, 1);
int rn = extract32(insn, 5, 5);
int imm6 = extract32(insn, 15, 6);
int sf_op_s = extract32(insn, 29, 3);
int mask = a->mask;
TCGv_i64 tcg_rn;
TCGv_i32 nzcv;
if (sf_op_s != 5 || o2 != 0 || !dc_isar_feature(aa64_condm_4, s)) {
unallocated_encoding(s);
return;
if (!dc_isar_feature(aa64_condm_4, s)) {
return false;
}
tcg_rn = read_cpu_reg(s, rn, 1);
tcg_gen_rotri_i64(tcg_rn, tcg_rn, imm6);
tcg_rn = read_cpu_reg(s, a->rn, 1);
tcg_gen_rotri_i64(tcg_rn, tcg_rn, a->imm);
nzcv = tcg_temp_new_i32();
tcg_gen_extrl_i64_i32(nzcv, tcg_rn);
@ -8086,6 +8074,7 @@ static void disas_rotate_right_into_flags(DisasContext *s, uint32_t insn)
if (mask & 1) { /* V */
tcg_gen_shli_i32(cpu_VF, nzcv, 31 - 0);
}
return true;
}
/*
@ -8297,11 +8286,6 @@ static void disas_data_proc_reg(DisasContext *s, uint32_t insn)
switch (op2) {
case 0x0:
switch (op3) {
case 0x01: /* Rotate right into flags */
case 0x21:
disas_rotate_right_into_flags(s, insn);
break;
case 0x02: /* Evaluate into flags */
case 0x12:
case 0x22:
@ -8311,6 +8295,8 @@ static void disas_data_proc_reg(DisasContext *s, uint32_t insn)
default:
case 0x00: /* Add/subtract (with carry) */
case 0x01: /* Rotate right into flags */
case 0x21:
goto do_unallocated;
}
break;