[PATCH v2 3/4] target/ppc: Remove larx/stcx. memory barrier semantics

[Nicholas Piggin]

larx and stcx. are not defined to order any memory operations.
Remove the barriers.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
 target/ppc/translate.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/target/ppc/translate.c b/target/ppc/translate.c
index 538f757dec..acb99d8691 100644
--- a/target/ppc/translate.c
+++ b/target/ppc/translate.c
@@ -3592,7 +3592,6 @@ static void gen_load_locked(DisasContext *ctx, MemOp 
memop)
     tcg_gen_mov_tl(cpu_reserve, t0);
     tcg_gen_movi_tl(cpu_reserve_length, memop_size(memop));
     tcg_gen_mov_tl(cpu_reserve_val, gpr);
-    tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ);
 }
 
 #define LARX(name, memop)                  \
@@ -3836,11 +3835,6 @@ static void gen_conditional_store(DisasContext *ctx, 
MemOp memop)
 
     gen_set_label(l1);
 
-    /*
-     * Address mismatch implies failure.  But we still need to provide
-     * the memory barrier semantics of the instruction.
-     */
-    tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
     tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so);
 
     gen_set_label(l2);
@@ -3944,11 +3938,6 @@ static void gen_stqcx_(DisasContext *ctx)
     tcg_gen_br(lab_over);
     gen_set_label(lab_fail);
 
-    /*
-     * Address mismatch implies failure.  But we still need to provide
-     * the memory barrier semantics of the instruction.
-     */
-    tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL);
     tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so);
 
     gen_set_label(lab_over);
-- 
2.40.1