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target-xtensa: check register window inline

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This lowers time spent in helper_window_check as reported by perf top
from ~8% to ~0.15% accelerating register-intensive tests by ~20%.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2013-07-21 12:55:46 +04:00
parent 0857a06ef7
commit 908c67fca4
1 changed files with 25 additions and 8 deletions
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33
target-xtensa/translate.c
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@ -305,16 +305,21 @@ static void gen_left_shift_sar(DisasContext *dc, TCGv_i32 sa)
tcg_temp_free(tmp);
}
static void gen_advance_ccount(DisasContext *dc)
static void gen_advance_ccount_cond(DisasContext *dc)
{
if (dc->ccount_delta > 0) {
TCGv_i32 tmp = tcg_const_i32(dc->ccount_delta);
dc->ccount_delta = 0;
gen_helper_advance_ccount(cpu_env, tmp);
tcg_temp_free(tmp);
}
}
static void gen_advance_ccount(DisasContext *dc)
{
gen_advance_ccount_cond(dc);
dc->ccount_delta = 0;
}
static void reset_used_window(DisasContext *dc)
{
dc->used_window = 0;
@ -829,15 +834,27 @@ static void gen_window_check1(DisasContext *dc, unsigned r1)
}
if (option_enabled(dc, XTENSA_OPTION_WINDOWED_REGISTER) &&
r1 / 4 > dc->used_window) {
TCGv_i32 pc = tcg_const_i32(dc->pc);
TCGv_i32 w = tcg_const_i32(r1 / 4);
int label = gen_new_label();
TCGv_i32 ws = tcg_temp_new_i32();
dc->used_window = r1 / 4;
gen_advance_ccount(dc);
gen_helper_window_check(cpu_env, pc, w);
tcg_gen_deposit_i32(ws, cpu_SR[WINDOW_START], cpu_SR[WINDOW_START],
dc->config->nareg / 4, dc->config->nareg / 4);
tcg_gen_shr_i32(ws, ws, cpu_SR[WINDOW_BASE]);
tcg_gen_andi_i32(ws, ws, (2 << (r1 / 4)) - 2);
tcg_gen_brcondi_i32(TCG_COND_EQ, ws, 0, label);
{
TCGv_i32 pc = tcg_const_i32(dc->pc);
TCGv_i32 w = tcg_const_i32(r1 / 4);
tcg_temp_free(w);
tcg_temp_free(pc);
gen_advance_ccount_cond(dc);
gen_helper_window_check(cpu_env, pc, w);
tcg_temp_free(w);
tcg_temp_free(pc);
}
gen_set_label(label);
tcg_temp_free(ws);
}
}