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target/cris: Improve JMP_INDIRECT 

Use movcond instead of brcond to set env_pc.
Discard the btarget and btaken variables to improve
register allocation and avoid unnecessary writeback.

Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2021-06-20 14:06:01 -07:00
parent e0a4620c1f
commit 3a1a80cc05
1 changed files with 10 additions and 12 deletions
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22
target/cris/translate.c
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@ -522,17 +522,6 @@ static void t_gen_swapr(TCGv d, TCGv s)
tcg_temp_free(org_s);
}
static void t_gen_cc_jmp(TCGv pc_true, TCGv pc_false)
{
TCGLabel *l1 = gen_new_label();
/* Conditional jmp. */
tcg_gen_mov_tl(env_pc, pc_false);
tcg_gen_brcondi_tl(TCG_COND_EQ, env_btaken, 0, l1);
tcg_gen_mov_tl(env_pc, pc_true);
gen_set_label(l1);
}
static bool use_goto_tb(DisasContext *dc, target_ulong dest)
{
return ((dest ^ dc->base.pc_first) & TARGET_PAGE_MASK) == 0;
@ -3321,8 +3310,17 @@ static void cris_tr_tb_stop(DisasContextBase *dcbase, CPUState *cpu)
/* fall through */
case JMP_INDIRECT:
t_gen_cc_jmp(env_btarget, tcg_constant_tl(npc));
tcg_gen_movcond_tl(TCG_COND_NE, env_pc,
env_btaken, tcg_constant_tl(0),
env_btarget, tcg_constant_tl(npc));
is_jmp = dc->cpustate_changed ? DISAS_UPDATE : DISAS_JUMP;
/*
* We have now consumed btaken and btarget. Hint to the
* tcg compiler that the writeback to env may be dropped.
*/
tcg_gen_discard_tl(env_btaken);
tcg_gen_discard_tl(env_btarget);
break;
default: