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[2/4] tcg/ppc: ST_ST memory ordering is not provided with eieio

Message ID 20220519135908.21282-3-npiggin@gmail.com
State New
Headers show
Series ppc: improve some memory ordering issues | expand

Commit Message

Nicholas Piggin May 19, 2022, 1:59 p.m. UTC 
eieio does not provide ordering between stores to CI memory and stores
to cacheable memory so it can't be used as a general ST_ST barrier.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-of-by: Nicholas Piggin <npiggin@gmail.com>
---
 tcg/ppc/tcg-target.c.inc | 2 --
 1 file changed, 2 deletions(-)
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Patch

diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index cfcd121f9c..3ff845d063 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -1836,8 +1836,6 @@  static void tcg_out_mb(TCGContext *s, TCGArg a0)
     a0 &= TCG_MO_ALL;
     if (a0 == TCG_MO_LD_LD) {
         insn = LWSYNC;
-    } else if (a0 == TCG_MO_ST_ST) {
-        insn = EIEIO;
     }
     tcg_out32(s, insn);
 }