From: Nicholas Piggin <npiggin@gmail.com>
To: qemu-ppc@nongnu.org
Cc: Nicholas Piggin <npiggin@gmail.com>,
qemu-devel@nongnu.org,
Richard Henderson <richard.henderson@linaro.org>
Subject: [PATCH 3/4] tcg/ppc: Optimize memory ordering generation with lwsync
Date: Thu, 19 May 2022 23:59:07 +1000 [thread overview]
Message-ID: <20220519135908.21282-4-npiggin@gmail.com> (raw)
In-Reply-To: <20220519135908.21282-1-npiggin@gmail.com>
lwsync orders more than just LD_LD, importantly it matches x86 and
s390 default memory ordering.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
tcg/ppc/tcg-target.c.inc | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index 3ff845d063..c0a5bca34f 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -1832,11 +1832,14 @@ static void tcg_out_brcond2 (TCGContext *s, const TCGArg *args,
static void tcg_out_mb(TCGContext *s, TCGArg a0)
{
- uint32_t insn = HWSYNC;
- a0 &= TCG_MO_ALL;
- if (a0 == TCG_MO_LD_LD) {
+ uint32_t insn;
+
+ if (a0 & TCG_MO_ST_LD) {
+ insn = HWSYNC;
+ } else {
insn = LWSYNC;
}
+
tcg_out32(s, insn);
}
--
2.35.1
next prev parent reply other threads:[~2022-05-19 14:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-19 13:59 [PATCH 0/4] ppc: improve some memory ordering issues Nicholas Piggin
2022-05-19 13:59 ` [PATCH 1/4] target/ppc: Fix eieio memory ordering semantics Nicholas Piggin
2022-05-19 15:30 ` Richard Henderson
2022-05-19 13:59 ` [PATCH 2/4] tcg/ppc: ST_ST memory ordering is not provided with eieio Nicholas Piggin
2022-05-19 13:59 ` Nicholas Piggin [this message]
2022-05-19 15:30 ` [PATCH 3/4] tcg/ppc: Optimize memory ordering generation with lwsync Richard Henderson
2022-05-19 13:59 ` [PATCH 4/4] target/ppc: Implement lwsync with weaker memory ordering Nicholas Piggin
2022-05-19 15:34 ` Richard Henderson
2022-05-23 19:24 ` [PATCH 0/4] ppc: improve some memory ordering issues Daniel Henrique Barboza
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