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tcg: define CF_PARALLEL and use it for TB hashing along with CF_COUNT_MASK

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This will enable us to decouple code translation from the value
of parallel_cpus at any given time. It will also help us minimize
TB flushes when generating code via EXCP_ATOMIC.

Note that the declaration of parallel_cpus is brought to exec-all.h
to be able to define there the "curr_cflags" inline.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Emilio G. Cota 2017-07-11 14:29:37 -04:00 • committed by Richard Henderson
parent e89b28a635
commit 4e2ca83e71
10 changed files with 65 additions and 39 deletions
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20
include/exec/exec-all.h
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@ -325,6 +325,9 @@ struct TranslationBlock {
#define CF_USE_ICOUNT 0x20000
#define CF_IGNORE_ICOUNT 0x40000 /* Do not generate icount code */
#define CF_INVALID 0x80000 /* TB is stale. Setters must acquire tb_lock */
#define CF_PARALLEL 0x100000 /* Generate code for a parallel context */
/* cflags' mask for hashing/comparison */
#define CF_HASH_MASK (CF_PARALLEL)
/* Per-vCPU dynamic tracing state used to generate this TB */
uint32_t trace_vcpu_dstate;
@ -365,11 +368,26 @@ struct TranslationBlock {
uintptr_t jmp_list_first;
};
extern bool parallel_cpus;
/* Hide the atomic_read to make code a little easier on the eyes */
static inline uint32_t tb_cflags(const TranslationBlock *tb)
{
return atomic_read(&tb->cflags);
}
/* current cflags for hashing/comparison */
static inline uint32_t curr_cflags(void)
{
return parallel_cpus ? CF_PARALLEL : 0;
}
void tb_free(TranslationBlock *tb);
void tb_flush(CPUState *cpu);
void tb_phys_invalidate(TranslationBlock *tb, tb_page_addr_t page_addr);
TranslationBlock *tb_htable_lookup(CPUState *cpu, target_ulong pc,
target_ulong cs_base, uint32_t flags);
target_ulong cs_base, uint32_t flags,
uint32_t cf_mask);
void tb_set_jmp_target(TranslationBlock *tb, int n, uintptr_t addr);
/* GETPC is the true target of the return instruction that we'll execute. */