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[PULL,25/34] tcg/ppc: Optimize memory ordering generation with lwsync

Message ID 20220526213815.92701-26-danielhb413@gmail.com
State New
Headers show
Series [PULL,01/34] pseries: allow setting stdout-path even on machines with a VGA | expand

Commit Message

Daniel Henrique Barboza May 26, 2022, 9:38 p.m. UTC 
From: Nicholas Piggin <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>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220519135908.21282-4-npiggin@gmail.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 tcg/ppc/tcg-target.c.inc | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)
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Patch

diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index 4750091c9c..de4483e43b 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);
 }