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microblaze: Use more TB chaining

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For some workloads with tight loops this ~doubles the emulation
speed.

Signed-off-by: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
This commit is contained in:
Edgar E. Iglesias 2011-01-05 02:21:19 +01:00 committed by Edgar E. Iglesias
parent 92d675d1c1
commit 23979dc541
1 changed files with 23 additions and 5 deletions
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28
target-microblaze/translate.c
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@ -752,9 +752,8 @@ static void dec_bit(DisasContext *dc)
static inline void sync_jmpstate(DisasContext *dc)
{
if (dc->jmp == JMP_DIRECT) {
dc->jmp = JMP_INDIRECT;
tcg_gen_movi_tl(env_btaken, 1);
tcg_gen_movi_tl(env_btarget, dc->jmp_pc);
dc->jmp = JMP_INDIRECT;
tcg_gen_movi_tl(env_btarget, dc->jmp_pc);
}
}
@ -976,11 +975,13 @@ static void dec_bcc(DisasContext *dc)
int32_t offset = (int32_t)((int16_t)dc->imm); /* sign-extend. */
tcg_gen_movi_tl(env_btarget, dc->pc + offset);
dc->jmp = JMP_DIRECT;
dc->jmp_pc = dc->pc + offset;
} else {
dc->jmp = JMP_INDIRECT;
tcg_gen_movi_tl(env_btarget, dc->pc);
tcg_gen_add_tl(env_btarget, env_btarget, *(dec_alu_op_b(dc)));
}
dc->jmp = JMP_INDIRECT;
eval_cc(dc, cc, env_btaken, cpu_R[dc->ra], tcg_const_tl(0));
}
@ -1028,6 +1029,7 @@ static void dec_br(DisasContext *dc)
if (dec_alu_op_b_is_small_imm(dc)) {
dc->jmp = JMP_DIRECT;
dc->jmp_pc = dc->pc + (int32_t)((int16_t)dc->imm);
tcg_gen_movi_tl(env_btaken, 1);
} else {
tcg_gen_movi_tl(env_btaken, 1);
tcg_gen_movi_tl(env_btarget, dc->pc);
@ -1130,6 +1132,7 @@ static void dec_rts(DisasContext *dc)
} else
LOG_DIS("rts ir=%x\n", dc->ir);
dc->jmp = JMP_INDIRECT;
tcg_gen_movi_tl(env_btaken, 1);
tcg_gen_add_tl(env_btarget, cpu_R[dc->ra], *(dec_alu_op_b(dc)));
}
@ -1370,6 +1373,9 @@ gen_intermediate_code_internal(CPUState *env, TranslationBlock *tb,
dc->is_jmp = DISAS_NEXT;
dc->jmp = 0;
dc->delayed_branch = !!(dc->tb_flags & D_FLAG);
if (dc->delayed_branch) {
dc->jmp = JMP_INDIRECT;
}
dc->pc = pc_start;
dc->singlestep_enabled = env->singlestep_enabled;
dc->cpustate_changed = 0;
@ -1441,9 +1447,21 @@ gen_intermediate_code_internal(CPUState *env, TranslationBlock *tb,
/* Clear the delay slot flag. */
dc->tb_flags &= ~D_FLAG;
/* If it is a direct jump, try direct chaining. */
if (dc->jmp != JMP_DIRECT) {
if (dc->jmp == JMP_INDIRECT) {
eval_cond_jmp(dc, env_btarget, tcg_const_tl(dc->pc));
dc->is_jmp = DISAS_JUMP;
} else if (dc->jmp == JMP_DIRECT) {
int l1;
t_sync_flags(dc);
l1 = gen_new_label();
/* Conditional jmp. */
tcg_gen_brcondi_tl(TCG_COND_NE, env_btaken, 0, l1);
gen_goto_tb(dc, 1, dc->pc);
gen_set_label(l1);
gen_goto_tb(dc, 0, dc->jmp_pc);
dc->is_jmp = DISAS_TB_JUMP;
}
break;
}