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authorRichard Henderson <richard.henderson@linaro.org>2018-10-06 09:05:30 -0700
committerRichard Henderson <richard.henderson@linaro.org>2018-10-18 18:58:10 -0700
commitd7f425fdea991f052241c6479acd9feae834063b (patch)
tree02fecbecf11af94168af50acfd5ece68cb4abd54 /tcg/tcg-op.c
parent77f7c747193662edfadeeb3118d63eed0eac51a6 (diff)
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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>
Diffstat (limited to 'tcg/tcg-op.c')
-rw-r--r--tcg/tcg-op.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index daa416a..7a8015c 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -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)