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([71.212.131.115]) by smtp.gmail.com with ESMTPSA id dw24-20020a17090b095800b00265c742a262sm288142pjb.4.2023.08.30.19.57.34 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Aug 2023 19:57:34 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 4/4] tcg: Eliminate duplicate env store operations Date: Wed, 30 Aug 2023 19:57:29 -0700 Message-Id: <20230831025729.1194388-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230831025729.1194388-1-richard.henderson@linaro.org> References: <20230831025729.1194388-1-richard.henderson@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::e30; envelope-from=richard.henderson@linaro.org; helo=mail-vs1-xe30.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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org Notice when a constant is stored to the same location twice. Signed-off-by: Richard Henderson --- tcg/optimize.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/tcg/optimize.c b/tcg/optimize.c index 51c4c61b9f..6efc08f593 100644 --- a/tcg/optimize.c +++ b/tcg/optimize.c @@ -2251,6 +2251,19 @@ static bool fold_tcg_st_memcopy(OptContext *ctx, TCGOp *op) src = arg_temp(op->args[0]); ofs = op->args[2]; type = ctx->type; + + /* + * Eliminate duplicate stores of a constant. + * This happens frequently when the target ISA zero-extends. + */ + if (ts_is_const(src)) { + TCGTemp *prev = find_mem_copy_for(ctx, type, ofs); + if (src == prev) { + tcg_op_remove(ctx->tcg, op); + return true; + } + } + last = ofs + tcg_type_size(type) - 1; remove_mem_copy_in(ctx, ofs, last); record_mem_copy(ctx, type, src, ofs, last);