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target-xtensa: implement conditional jumps

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- BZ (comparison to zero);
- BI0 (comparison to signed immediate);
- BI1 (comparison to unsigned immediate);
- B (two registers comparison, bit sets comparison);
- BEQZ.N/BNEZ.N (narrow comparison to zero).

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Max Filippov 2011-09-06 03:55:31 +04:00 committed by Blue Swirl
parent 7b039f741c
commit bd57fb91ae
1 changed files with 164 additions and 0 deletions
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164
target-xtensa/translate.c
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@ -121,6 +121,25 @@ static void gen_jumpi(DisasContext *dc, uint32_t dest, int slot)
tcg_temp_free(tmp);
}
static void gen_brcond(DisasContext *dc, TCGCond cond,
TCGv_i32 t0, TCGv_i32 t1, uint32_t offset)
{
int label = gen_new_label();
tcg_gen_brcond_i32(cond, t0, t1, label);
gen_jumpi(dc, dc->next_pc, 0);
gen_set_label(label);
gen_jumpi(dc, dc->pc + offset, 1);
}
static void gen_brcondi(DisasContext *dc, TCGCond cond,
TCGv_i32 t0, uint32_t t1, uint32_t offset)
{
TCGv_i32 tmp = tcg_const_i32(t1);
gen_brcond(dc, cond, t0, tmp, offset);
tcg_temp_free(tmp);
}
static void disas_xtensa_insn(DisasContext *dc)
{
#define HAS_OPTION(opt) do { \
@ -202,6 +221,14 @@ static void disas_xtensa_insn(DisasContext *dc)
uint8_t b1 = ldub_code(dc->pc + 1);
uint8_t b2 = ldub_code(dc->pc + 2);
static const uint32_t B4CONST[] = {
0xffffffff, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 16, 32, 64, 128, 256
};
static const uint32_t B4CONSTU[] = {
32768, 65536, 2, 3, 4, 5, 6, 7, 8, 10, 12, 16, 32, 64, 128, 256
};
if (OP0 >= 8) {
dc->next_pc = dc->pc + 2;
HAS_OPTION(XTENSA_OPTION_CODE_DENSITY);
@ -395,10 +422,143 @@ static void disas_xtensa_insn(DisasContext *dc)
gen_jumpi(dc, dc->pc + 4 + CALL_OFFSET_SE, 0);
break;
case 1: /*BZ*/
{
static const TCGCond cond[] = {
TCG_COND_EQ, /*BEQZ*/
TCG_COND_NE, /*BNEZ*/
TCG_COND_LT, /*BLTZ*/
TCG_COND_GE, /*BGEZ*/
};
gen_brcondi(dc, cond[BRI12_M & 3], cpu_R[BRI12_S], 0,
4 + BRI12_IMM12_SE);
}
break;
case 2: /*BI0*/
{
static const TCGCond cond[] = {
TCG_COND_EQ, /*BEQI*/
TCG_COND_NE, /*BNEI*/
TCG_COND_LT, /*BLTI*/
TCG_COND_GE, /*BGEI*/
};
gen_brcondi(dc, cond[BRI8_M & 3],
cpu_R[BRI8_S], B4CONST[BRI8_R], 4 + BRI8_IMM8_SE);
}
break;
case 3: /*BI1*/
switch (BRI8_M) {
case 0: /*ENTRYw*/
HAS_OPTION(XTENSA_OPTION_WINDOWED_REGISTER);
break;
case 1: /*B1*/
switch (BRI8_R) {
case 0: /*BFp*/
HAS_OPTION(XTENSA_OPTION_BOOLEAN);
break;
case 1: /*BTp*/
HAS_OPTION(XTENSA_OPTION_BOOLEAN);
break;
case 8: /*LOOP*/
break;
case 9: /*LOOPNEZ*/
break;
case 10: /*LOOPGTZ*/
break;
default: /*reserved*/
break;
}
break;
case 2: /*BLTUI*/
case 3: /*BGEUI*/
gen_brcondi(dc, BRI8_M == 2 ? TCG_COND_LTU : TCG_COND_GEU,
cpu_R[BRI8_S], B4CONSTU[BRI8_R], 4 + BRI8_IMM8_SE);
break;
}
break;
}
break;
case 7: /*B*/
{
TCGCond eq_ne = (RRI8_R & 8) ? TCG_COND_NE : TCG_COND_EQ;
switch (RRI8_R & 7) {
case 0: /*BNONE*/ /*BANY*/
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_and_i32(tmp, cpu_R[RRI8_S], cpu_R[RRI8_T]);
gen_brcondi(dc, eq_ne, tmp, 0, 4 + RRI8_IMM8_SE);
tcg_temp_free(tmp);
}
break;
case 1: /*BEQ*/ /*BNE*/
case 2: /*BLT*/ /*BGE*/
case 3: /*BLTU*/ /*BGEU*/
{
static const TCGCond cond[] = {
[1] = TCG_COND_EQ,
[2] = TCG_COND_LT,
[3] = TCG_COND_LTU,
[9] = TCG_COND_NE,
[10] = TCG_COND_GE,
[11] = TCG_COND_GEU,
};
gen_brcond(dc, cond[RRI8_R], cpu_R[RRI8_S], cpu_R[RRI8_T],
4 + RRI8_IMM8_SE);
}
break;
case 4: /*BALL*/ /*BNALL*/
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_and_i32(tmp, cpu_R[RRI8_S], cpu_R[RRI8_T]);
gen_brcond(dc, eq_ne, tmp, cpu_R[RRI8_T],
4 + RRI8_IMM8_SE);
tcg_temp_free(tmp);
}
break;
case 5: /*BBC*/ /*BBS*/
{
TCGv_i32 bit = tcg_const_i32(1);
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_andi_i32(tmp, cpu_R[RRI8_T], 0x1f);
tcg_gen_shl_i32(bit, bit, tmp);
tcg_gen_and_i32(tmp, cpu_R[RRI8_S], bit);
gen_brcondi(dc, eq_ne, tmp, 0, 4 + RRI8_IMM8_SE);
tcg_temp_free(tmp);
tcg_temp_free(bit);
}
break;
case 6: /*BBCI*/ /*BBSI*/
case 7:
{
TCGv_i32 tmp = tcg_temp_new_i32();
tcg_gen_andi_i32(tmp, cpu_R[RRI8_S],
1 << (((RRI8_R & 1) << 4) | RRI8_T));
gen_brcondi(dc, eq_ne, tmp, 0, 4 + RRI8_IMM8_SE);
tcg_temp_free(tmp);
}
break;
}
}
break;
#define gen_narrow_load_store(type) do { \
@ -431,6 +591,10 @@ static void disas_xtensa_insn(DisasContext *dc)
RRRN_R | (RRRN_T << 4) |
((RRRN_T & 6) == 6 ? 0xffffff80 : 0));
} else { /*BEQZ.Nn*/ /*BNEZ.Nn*/
TCGCond eq_ne = (RRRN_T & 4) ? TCG_COND_NE : TCG_COND_EQ;
gen_brcondi(dc, eq_ne, cpu_R[RRRN_S], 0,
4 + (RRRN_R | ((RRRN_T & 3) << 4)));
}
break;