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tcg: Implement CPU_LOG_TB_NOCHAIN during expansion 

Rather than test NOCHAIN before linking, do not emit the
goto_tb opcode at all.  We already do this for goto_ptr.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-10-06 09:05:30 -07:00
parent 77f7c74719
commit d7f425fdea
2 changed files with 9 additions and 2 deletions
accel/tcg
cpu-exec.c
tcg
tcg-op.c

2
accel/tcg/cpu-exec.c
View File

@ -416,7 +416,7 @@ static inline TranslationBlock *tb_find(CPUState *cpu,
}
#endif
/* See if we can patch the calling TB. */
if (last_tb && !qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
if (last_tb) {
tb_add_jump(last_tb, tb_exit, tb);
}
return tb;

9
tcg/tcg-op.c
View File

@ -2586,6 +2586,10 @@ void tcg_gen_exit_tb(TranslationBlock *tb, unsigned idx)
seen this numbered exit before, via tcg_gen_goto_tb. */
tcg_debug_assert(tcg_ctx->goto_tb_issue_mask & (1 << idx));
#endif
/* When not chaining, exit without indicating a link. */
if (qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
val = 0;
}
} else {
/* This is an exit via the exitreq label. */
tcg_debug_assert(idx == TB_EXIT_REQUESTED);
@ -2603,7 +2607,10 @@ void tcg_gen_goto_tb(unsigned idx)
tcg_debug_assert((tcg_ctx->goto_tb_issue_mask & (1 << idx)) == 0);
tcg_ctx->goto_tb_issue_mask |= 1 << idx;
#endif
tcg_gen_op1i(INDEX_op_goto_tb, idx);
/* When not chaining, we simply fall through to the "fallback" exit. */
if (!qemu_loglevel_mask(CPU_LOG_TB_NOCHAIN)) {
tcg_gen_op1i(INDEX_op_goto_tb, idx);
}
}
void tcg_gen_lookup_and_goto_ptr(void)