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[176.184.55.179]) by smtp.gmail.com with ESMTPSA id l2-20020a05600c4f0200b0041be78ae1f0sm12665835wmq.2.2024.04.30.09.31.54 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 30 Apr 2024 09:31:55 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Cc: Yoshinori Sato , John Paul Adrian Glaubitz , Paul Cercueil , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Richard Henderson Subject: [PATCH v4 4/4] target/sh4: Rename TCGv variables as manual for SUBV opcode Date: Tue, 30 Apr 2024 18:31:25 +0200 Message-ID: <20240430163125.77430-5-philmd@linaro.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20240430163125.77430-1-philmd@linaro.org> References: <20240430163125.77430-1-philmd@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::32b; envelope-from=philmd@linaro.org; helo=mail-wm1-x32b.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 To easily compare with the SH4 manual, rename: REG(B11_8) -> Rn REG(B7_4) -> Rm t0 -> result Mention how underflow is calculated. Reviewed-by: Richard Henderson Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Yoshinori Sato --- target/sh4/translate.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-) diff --git a/target/sh4/translate.c b/target/sh4/translate.c index 47c0f3404e..e599ab9d1a 100644 --- a/target/sh4/translate.c +++ b/target/sh4/translate.c @@ -933,16 +933,20 @@ static void _decode_opc(DisasContext * ctx) return; case 0x300b: /* subv Rm,Rn */ { - TCGv t0, t1, t2; - t0 = tcg_temp_new(); - tcg_gen_sub_i32(t0, REG(B11_8), REG(B7_4)); + TCGv Rn = REG(B11_8); + TCGv Rm = REG(B7_4); + TCGv result, t1, t2; + + result = tcg_temp_new(); t1 = tcg_temp_new(); - tcg_gen_xor_i32(t1, t0, REG(B11_8)); t2 = tcg_temp_new(); - tcg_gen_xor_i32(t2, REG(B11_8), REG(B7_4)); + tcg_gen_sub_i32(result, Rn, Rm); + /* T = ((Rn ^ Rm) & (Result ^ Rn)) >> 31 */ + tcg_gen_xor_i32(t1, result, Rn); + tcg_gen_xor_i32(t2, Rn, Rm); tcg_gen_and_i32(t1, t1, t2); tcg_gen_shri_i32(cpu_sr_t, t1, 31); - tcg_gen_mov_i32(REG(B11_8), t0); + tcg_gen_mov_i32(Rn, result); } return; case 0x2008: /* tst Rm,Rn */