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exec: drop cpu_can_do_io, just read cpu->can_do_io

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After commit 626cf8f (icount: set can_do_io outside TB execution,
2014-12-08), can_do_io is set to 1 if not executing code.  It is
no longer necessary to make this assumption in cpu_can_do_io.

It is also possible to remove the use_icount test, simply by
never setting cpu->can_do_io to 0 unless use_icount is true.

With these changes cpu_can_do_io boils down to a read of
cpu->can_do_io.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-06-24 14:16:26 +02:00
parent b4a4b8d0e0
commit 414b15c909
7 changed files with 10 additions and 28 deletions
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2
cpu-exec.c
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@ -196,7 +196,7 @@ static inline tcg_target_ulong cpu_tb_exec(CPUState *cpu, uint8_t *tb_ptr)
}
#endif /* DEBUG_DISAS */
cpu->can_do_io = 0;
cpu->can_do_io = !use_icount;
next_tb = tcg_qemu_tb_exec(env, tb_ptr);
cpu->can_do_io = 1;
trace_exec_tb_exit((void *) (next_tb & ~TB_EXIT_MASK),