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icount: remove unnecessary gen_io_end calls

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Prior patch resets can_do_io flag at the TB entry. Therefore there is no
need in resetting this flag at the end of the block.
This patch removes redundant gen_io_end calls.

Signed-off-by: Pavel Dovgalyuk <Pavel.Dovgaluk@ispras.ru>
Message-Id: <156404429499.18669.13404064982854123855.stgit@pasha-Precision-3630-Tower>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@gmail.com>
This commit is contained in:
Pavel Dovgalyuk 2019-07-25 11:44:55 +03:00 • committed by Paolo Bonzini
parent ba3e792669
commit 9e9b10c649
18 changed files with 7 additions and 102 deletions
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8
include/exec/gen-icount.h
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@ -16,6 +16,13 @@ static inline void gen_io_start(void)
tcg_temp_free_i32(tmp);
}
/*
* cpu->can_do_io is cleared automatically at the beginning of
* each translation block. The cost is minimal and only paid
* for -icount, plus it would be very easy to forget doing it
* in the translator. Therefore, backends only need to call
* gen_io_start.
*/
static inline void gen_io_end(void)
{
TCGv_i32 tmp = tcg_const_i32(0);
@ -58,7 +65,6 @@ static inline void gen_tb_start(TranslationBlock *tb)
tcg_gen_st16_i32(count, cpu_env,
offsetof(ArchCPU, neg.icount_decr.u16.low) -
offsetof(ArchCPU, env));
/* Disable I/O by default */
gen_io_end();
}