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[PATCH v3 3/5] tcg: Elide memory barriers implied by the host memory mod
From: |
Richard Henderson |
Subject: |
[PATCH v3 3/5] tcg: Elide memory barriers implied by the host memory model |
Date: |
Mon, 19 Jun 2023 16:23:31 +0200 |
Reduce the set of required barriers to those needed by
the host right from the beginning.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/tcg-op.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/tcg/tcg-op.c b/tcg/tcg-op.c
index 7aadb37756..574001c221 100644
--- a/tcg/tcg-op.c
+++ b/tcg/tcg-op.c
@@ -115,7 +115,11 @@ void tcg_gen_mb(TCGBar mb_type)
#endif
if (parallel) {
- tcg_gen_op1(INDEX_op_mb, mb_type);
+ /* We can elide anything which the host provides for free. */
+ mb_type &= ~TCG_TARGET_DEFAULT_MO;
+ if (mb_type & TCG_MO_ALL) {
+ tcg_gen_op1(INDEX_op_mb, mb_type);
+ }
}
}
--
2.34.1
- [PATCH v3 0/5] tcg: Issue memory barriers for guest memory model, Richard Henderson, 2023/06/19
- [PATCH v3 1/5] target/microblaze: Define TCG_GUEST_DEFAULT_MO, Richard Henderson, 2023/06/19
- [PATCH v3 2/5] tcg: Do not elide memory barriers for !CF_PARALLEL in system mode, Richard Henderson, 2023/06/19
- [PATCH v3 4/5] tcg: Add host memory barriers to cpu_ldst.h interfaces, Richard Henderson, 2023/06/19
- [PATCH v3 5/5] accel/tcg: Remove check_tcg_memory_orders_compatible, Richard Henderson, 2023/06/19
- [PATCH v3 3/5] tcg: Elide memory barriers implied by the host memory model,
Richard Henderson <=
- Re: [PATCH v3 0/5] tcg: Issue memory barriers for guest memory model, Richard Henderson, 2023/06/19
- Re: [PATCH v3 0/5] tcg: Issue memory barriers for guest memory model, Richard Henderson, 2023/06/26