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target-arm/translate.c: update gen_test_cc from 1.0 to 3.0
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Signed-off-by: chaojixx <[email protected]>
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@weizhou-chaojixx
weizhou-chaojixx committed Jan 13, 2020
1 parent a0c0b9a commit 1235ebb
Showing 1 changed file with 47 additions and 56 deletions.
103 changes: 47 additions & 56 deletions src/target-arm/translate.c
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Original file line number Diff line number Diff line change
Expand Up @@ -728,98 +728,89 @@ static void gen_thumb2_parallel_addsub(int op1, int op2, TCGv a, TCGv b) {
static void gen_test_cc(int cc, TCGLabel *label) {
TCGv tmp;
TCGv tmp2;
TCGLabel *inv;

TCGv_i32 value;
TCGCond cond;

switch (cc) {
case 0: /* eq: Z */
tmp = load_cpu_field(ZF);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, label);
break;
case 1: /* ne: !Z */
tmp = load_cpu_field(ZF);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, label);
cond = TCG_COND_EQ;
value = load_cpu_field(ZF);
break;
case 2: /* cs: C */
tmp = load_cpu_field(CF);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, label);
break;
case 3: /* cc: !C */
tmp = load_cpu_field(CF);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, label);
cond = TCG_COND_NE;
value = load_cpu_field(CF);
break;
case 4: /* mi: N */
tmp = load_cpu_field(NF);
tcg_gen_brcondi_i32(TCG_COND_LT, tmp, 0, label);
break;
case 5: /* pl: !N */
tmp = load_cpu_field(NF);
tcg_gen_brcondi_i32(TCG_COND_GE, tmp, 0, label);
cond = TCG_COND_LT;
value = load_cpu_field(NF);
break;
case 6: /* vs: V */
tmp = load_cpu_field(VF);
tcg_gen_brcondi_i32(TCG_COND_LT, tmp, 0, label);
break;
case 7: /* vc: !V */
tmp = load_cpu_field(VF);
tcg_gen_brcondi_i32(TCG_COND_GE, tmp, 0, label);
cond = TCG_COND_LT;
value = load_cpu_field(VF);
break;
case 8: /* hi: C && !Z */
inv = gen_new_label();
tmp = load_cpu_field(CF);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, inv);
tcg_temp_free_i32(tmp);
tmp = load_cpu_field(ZF);
tcg_gen_brcondi_i32(TCG_COND_NE, tmp, 0, label);
gen_set_label(inv);
break;
case 9: /* ls: !C || Z */
cond = TCG_COND_NE;
value = tcg_temp_new_i32();
tmp = load_cpu_field(CF);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, label);
tmp2 = load_cpu_field(ZF);
/* CF is 1 for C, so -CF is an all-bits-set mask for C;
ZF is non-zero for !Z; so AND the two subexpressions. */
tcg_gen_neg_i32(value, tmp);
tcg_gen_and_i32(value, value, tmp2);
tcg_temp_free_i32(tmp);
tmp = load_cpu_field(ZF);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, label);
break;
case 10: /* ge: N == V -> N ^ V == 0 */
tmp = load_cpu_field(VF);
tmp2 = load_cpu_field(NF);
tcg_gen_xor_i32(tmp, tmp, tmp2);
tcg_temp_free_i32(tmp2);
tcg_gen_brcondi_i32(TCG_COND_GE, tmp, 0, label);
break;
case 10: /* ge: N == V -> N ^ V == 0 */
case 11: /* lt: N != V -> N ^ V != 0 */
cond = TCG_COND_GE;
value = tcg_temp_new_i32();
tmp = load_cpu_field(VF);
tmp2 = load_cpu_field(NF);
tcg_gen_xor_i32(tmp, tmp, tmp2);
tcg_gen_xor_i32(value, tmp, tmp2);
tcg_temp_free_i32(tmp);
tcg_temp_free_i32(tmp2);
tcg_gen_brcondi_i32(TCG_COND_LT, tmp, 0, label);
break;
case 12: /* gt: !Z && N == V */
inv = gen_new_label();
tmp = load_cpu_field(ZF);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, inv);
tcg_temp_free_i32(tmp);
case 13: /* le: Z || N != V */
cond = TCG_COND_NE;
value = tcg_temp_new_i32();
tmp = load_cpu_field(VF);
tmp2 = load_cpu_field(NF);
tcg_gen_xor_i32(tmp, tmp, tmp2);
/* (N == V) is equal to the sign bit of ~(NF ^ VF). Propagate
* the sign bit then AND with ZF to yield the result. */
tcg_gen_xor_i32(value, tmp, tmp2);
tcg_gen_sari_i32(value, value, 31);
tcg_temp_free_i32(tmp);
tcg_temp_free_i32(tmp2);
tcg_gen_brcondi_i32(TCG_COND_GE, tmp, 0, label);
gen_set_label(inv);
break;
case 13: /* le: Z || N != V */
tmp = load_cpu_field(ZF);
tcg_gen_brcondi_i32(TCG_COND_EQ, tmp, 0, label);
tcg_gen_andc_i32(value, tmp, value);
tcg_temp_free_i32(tmp);
tmp = load_cpu_field(VF);
tmp2 = load_cpu_field(NF);
tcg_gen_xor_i32(tmp, tmp, tmp2);
tcg_temp_free_i32(tmp2);
tcg_gen_brcondi_i32(TCG_COND_LT, tmp, 0, label);
break;
case 14: /* always */
case 15: /* always */
/* Use the ALWAYS condition, which will fold early.
* It doesn't matter what we use for the value. */
cond = TCG_COND_ALWAYS;
value = load_cpu_field(ZF);
goto no_invert;
default:
fprintf(stderr, "Bad condition code 0x%x\n", cc);
abort();
}
tcg_temp_free_i32(tmp);

if (cc & 1) {
cond = tcg_invert_cond(cond);
}

no_invert:
tcg_gen_brcondi_i32(cond, value, 0, label);
tcg_temp_free_i32(value);
}

static const uint8_t table_logic_cc[16] = {
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