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Sun, 04 Jun 2023 19:54:59 -0700 (PDT) From: Nicholas Piggin To: Daniel Henrique Barboza Cc: Nicholas Piggin , Richard Henderson , qemu-ppc@nongnu.org, qemu-devel@nongnu.org, qemu-stable@nongnu.org Subject: [PATCH v2 3/4] target/ppc: Remove larx/stcx. memory barrier semantics Date: Mon, 5 Jun 2023 12:54:44 +1000 Message-Id: <20230605025445.161932-3-npiggin@gmail.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230605025445.161932-1-npiggin@gmail.com> References: <20230605025445.161932-1-npiggin@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::52f; envelope-from=npiggin@gmail.com; helo=mail-pg1-x52f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org larx and stcx. are not defined to order any memory operations. Remove the barriers. Reviewed-by: Richard Henderson Signed-off-by: Nicholas Piggin --- 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);