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tcg: Optimize qemu_ld/st by generating slow paths at the end of a block

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Add optimized TCG qemu_ld/st generation which locates the code of TLB miss
cases at the end of a block after generating the other IRs.
Currently, this optimization supports only i386 and x86_64 hosts.

Signed-off-by: Yeongkyoon Lee <yeongkyoon.lee@samsung.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Yeongkyoon Lee 2012-10-31 16:04:25 +09:00 • committed by Blue Swirl
parent fdbb84d133
commit b76f0d8c2e
3 changed files with 338 additions and 144 deletions
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12
tcg/tcg.c
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@ -299,6 +299,14 @@ void tcg_func_start(TCGContext *s)
gen_opc_ptr = gen_opc_buf;
gen_opparam_ptr = gen_opparam_buf;
#if defined(CONFIG_QEMU_LDST_OPTIMIZATION) && defined(CONFIG_SOFTMMU)
/* Initialize qemu_ld/st labels to assist code generation at the end of TB
for TLB miss cases at the end of TB */
s->qemu_ldst_labels = tcg_malloc(sizeof(TCGLabelQemuLdst) *
TCG_MAX_QEMU_LDST);
s->nb_qemu_ldst_labels = 0;
#endif
}
static inline void tcg_temp_alloc(TCGContext *s, int n)
@ -2314,6 +2322,10 @@ static inline int tcg_gen_code_common(TCGContext *s, uint8_t *gen_code_buf,
#endif
}
the_end:
#if defined(CONFIG_QEMU_LDST_OPTIMIZATION) && defined(CONFIG_SOFTMMU)
/* Generate TB finalization at the end of block */
tcg_out_tb_finalize(s);
#endif
return -1;
}