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accel/tcg: Hoist CF_MEMI_ONLY check outside translation loop 

The condition checked is loop invariant; check it only once.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-09-14 07:48:39 -07:00
parent f47a90dacc
commit 5d97e94638
1 changed files with 8 additions and 6 deletions
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14
accel/tcg/translator.c
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@ -158,7 +158,13 @@ void translator_loop(CPUState *cpu, TranslationBlock *tb, int *max_insns,
ops->tb_start(db, cpu);
tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
plugin_enabled = plugin_gen_tb_start(cpu, db, cflags & CF_MEMI_ONLY);
if (cflags & CF_MEMI_ONLY) {
/* We should only see CF_MEMI_ONLY for io_recompile. */
assert(cflags & CF_LAST_IO);
plugin_enabled = plugin_gen_tb_start(cpu, db, true);
} else {
plugin_enabled = plugin_gen_tb_start(cpu, db, false);
}
while (true) {
*max_insns = ++db->num_insns;
@ -176,12 +182,8 @@ void translator_loop(CPUState *cpu, TranslationBlock *tb, int *max_insns,
if (db->num_insns == db->max_insns && (cflags & CF_LAST_IO)) {
/* Accept I/O on the last instruction. */
gen_io_start();
ops->translate_insn(db, cpu);
} else {
/* we should only see CF_MEMI_ONLY for io_recompile */
tcg_debug_assert(!(cflags & CF_MEMI_ONLY));
ops->translate_insn(db, cpu);
}
ops->translate_insn(db, cpu);
/*
* We can't instrument after instructions that change control