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[176.184.55.179]) by smtp.gmail.com with ESMTPSA id je1-20020a05600c1f8100b0041adf358058sm25854005wmb.27.2024.04.30.09.31.34 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 30 Apr 2024 09:31:35 -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?= , qemu-stable@nongnu.org, Richard Henderson Subject: [PATCH v4 1/4] target/sh4: Fix ADDV opcode Date: Tue, 30 Apr 2024 18:31:22 +0200 Message-ID: <20240430163125.77430-2-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::22c; envelope-from=philmd@linaro.org; helo=mail-lj1-x22c.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=unavailable 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 The documentation says: ADDV Rm, Rn Rn + Rm -> Rn, overflow -> T But QEMU implementation was: ADDV Rm, Rn Rn + Rm -> Rm, overflow -> T Fix by filling the correct Rm register. Add tests provided by Paul Cercueil. Cc: qemu-stable@nongnu.org Fixes: ad8d25a11f ("target-sh4: implement addv and subv using TCG") Reported-by: Paul Cercueil Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2317 Reviewed-by: Richard Henderson Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Yoshinori Sato --- target/sh4/translate.c | 2 +- tests/tcg/sh4/test-addv.c | 27 +++++++++++++++++++++++++++ tests/tcg/sh4/Makefile.target | 3 +++ 3 files changed, 31 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/sh4/test-addv.c diff --git a/target/sh4/translate.c b/target/sh4/translate.c index ebb6c901bf..4a1dd0d1f4 100644 --- a/target/sh4/translate.c +++ b/target/sh4/translate.c @@ -714,7 +714,7 @@ static void _decode_opc(DisasContext * ctx) tcg_gen_xor_i32(t2, REG(B7_4), REG(B11_8)); tcg_gen_andc_i32(cpu_sr_t, t1, t2); tcg_gen_shri_i32(cpu_sr_t, cpu_sr_t, 31); - tcg_gen_mov_i32(REG(B7_4), t0); + tcg_gen_mov_i32(REG(B11_8), t0); } return; case 0x2009: /* and Rm,Rn */ diff --git a/tests/tcg/sh4/test-addv.c b/tests/tcg/sh4/test-addv.c new file mode 100644 index 0000000000..64f709161f --- /dev/null +++ b/tests/tcg/sh4/test-addv.c @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include +#include +#include + +static void addv(const int a, const int b, const int res, const int carry) +{ + int o = a, c; + + asm volatile("addv %2,%0\n" + "movt %1\n" + : "+r"(o), "=r"(c) : "r"(b) :); + + if (c != carry || aw != res) { + printf("ADDV %d, %d = %d/%d [T = %d/%d]\n", a, b, o, res, c, carry); + abort(); + } +} + +int main(void) +{ + addv(INT_MAX, 1, INT_MIN, 1); + addv(INT_MAX - 1, 1, INT_MAX, 0); + + return 0; +} diff --git a/tests/tcg/sh4/Makefile.target b/tests/tcg/sh4/Makefile.target index 4d09291c0c..521b8b0a76 100644 --- a/tests/tcg/sh4/Makefile.target +++ b/tests/tcg/sh4/Makefile.target @@ -17,3 +17,6 @@ TESTS += test-macl test-macw: CFLAGS += -O -g TESTS += test-macw + +test-addv: CFLAGS += -O -g +TESTS += test-addv From patchwork Tue Apr 30 16:31:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= X-Patchwork-Id: 793333 Delivered-To: patch@linaro.org Received: by 2002:a05:6000:54f:b0:34d:5089:5a9e with SMTP id b15csp358373wrf; Tue, 30 Apr 2024 09:33:35 -0700 (PDT) X-Forwarded-Encrypted: i=2; AJvYcCV2LWrmEtoaTyiFsF+n31tBkqrNGhqZr/vKpp10XTH6ntDS9fx7kbgUv3n+TyjZRafXPcXLYhFU5VxTHe0yN5OF X-Google-Smtp-Source: AGHT+IHx51/LsaEhtcCk/36m1N34IYEaKKQ+ssMsYyfSy3iSecJJGmFzWFVY2pUmhSZEY4Yaet5y X-Received: by 2002:a05:6214:2249:b0:6a0:cd3e:aeb3 with SMTP id c9-20020a056214224900b006a0cd3eaeb3mr8237688qvc.32.1714494815198; Tue, 30 Apr 2024 09:33:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1714494815; cv=none; d=google.com; s=arc-20160816; b=Q2ZKeuqXDvnm7LeP+bjnXG/57g9OGpCH19LPyujjfAGv5j+iw0lquAF2zCvIqETL0N dhgK+8Hc/cT2dqgZEsMhmP++KfRFfdkXEpesLQd0+fgHzoFuGi9nRysJU5ue7CtV1q1l luyfu2MQJoSwZIifAYhu8oyGO86TyshWSVjRqK4KoOe+MU70PpygWJCMi5ED57Dhh87u 1TGXRVAnEFsIHCm+9Su1SbLh7kta30XtWOSOk9n3lGtespSUvELUCoGOkNQ8HbE6ohtl Q0AO70FG3cNE2s7Gr0w4uKkNIMlnj/YWvVakQt1F81WfrNEjrp8OnAXjUBsQC42XtXzf vBug== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=y3Dvy0wvVxKNBXh21IDmsrC5sWJZyoTg3iWrcJY72Ng=; fh=L8lDQ72HawmftdLCi7t1HB2j5C28HP/PacMOca6OS1E=; b=Ln4hI/RLKHH0LZCjO/lUcjX/DqcisK7vXSA57STfU3ZiHfurRuEuL7m8wVfdQpzEdm ZMEkYIJ4tHMLzXHm+WWb2pRf5SiR5qYLihWZe2wmMBjo+xP2ODkImT18J0hyRnAvnClA zIH+GLypOQPKaOFhEbhsRhDfrFSyNjFJUOhBfwpTvNFy959R2EpL7gIHKXyp606jiuET H7J3dqv7t7z4Q34rwSEFLRcQgz12ZlhspuEEK77wW37CUqLflO9YjcVHSn5YMS0iWrWI KsseNz2edBKzmyqpUCZFZAVehsrjyFciA0OM26SKC+E7Jg7NU5mfC5RTA6IACNfFH1WG YrgA==; dara=google.com ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=kLr90zxL; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. 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[176.184.55.179]) by smtp.gmail.com with ESMTPSA id n7-20020a05600c500700b0041bc412899fsm14286158wmr.42.2024.04.30.09.31.42 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 30 Apr 2024 09:31:43 -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?= , qemu-stable@nongnu.org, Richard Henderson Subject: [PATCH v4 2/4] target/sh4: Fix SUBV opcode Date: Tue, 30 Apr 2024 18:31:23 +0200 Message-ID: <20240430163125.77430-3-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::32d; envelope-from=philmd@linaro.org; helo=mail-wm1-x32d.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=unavailable 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 The documentation says: SUBV Rm, Rn Rn - Rm -> Rn, underflow -> T The overflow / underflow can be calculated as: T = ((Rn ^ Rm) & (Result ^ Rn)) >> 31 However we were using the incorrect: T = ((Rn ^ Rm) & (Result ^ Rm)) >> 31 Fix by using the Rn register instead of Rm. Add tests provided by Paul Cercueil. Cc: qemu-stable@nongnu.org Fixes: ad8d25a11f ("target-sh4: implement addv and subv using TCG") Reported-by: Paul Cercueil Suggested-by: Paul Cercueil Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2318 Reviewed-by: Richard Henderson Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Yoshinori Sato --- target/sh4/translate.c | 2 +- tests/tcg/sh4/test-subv.c | 30 ++++++++++++++++++++++++++++++ tests/tcg/sh4/Makefile.target | 3 +++ 3 files changed, 34 insertions(+), 1 deletion(-) create mode 100644 tests/tcg/sh4/test-subv.c diff --git a/target/sh4/translate.c b/target/sh4/translate.c index 4a1dd0d1f4..3e013b7c7c 100644 --- a/target/sh4/translate.c +++ b/target/sh4/translate.c @@ -933,7 +933,7 @@ static void _decode_opc(DisasContext * ctx) t0 = tcg_temp_new(); tcg_gen_sub_i32(t0, REG(B11_8), REG(B7_4)); t1 = tcg_temp_new(); - tcg_gen_xor_i32(t1, t0, REG(B7_4)); + 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_and_i32(t1, t1, t2); diff --git a/tests/tcg/sh4/test-subv.c b/tests/tcg/sh4/test-subv.c new file mode 100644 index 0000000000..0dd8fcdaac --- /dev/null +++ b/tests/tcg/sh4/test-subv.c @@ -0,0 +1,30 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ + +#include +#include +#include + +static void subv(const int a, const int b, const int res, const int carry) +{ + int o = a, c; + + asm volatile("subv %2,%0\n" + "movt %1\n" + : "+r"(o), "=r"(c) : "r"(b) :); + + if (c != carry || o != res) { + printf("SUBV %d, %d = %d/%d [T = %d/%d]\n", a, b, o, res, c, carry); + abort(); + } +} + +int main(void) +{ + subv(INT_MIN, 1, INT_MAX, 1); + subv(INT_MAX, -1, INT_MIN, 1); + subv(INT_MAX, 1, INT_MAX - 1, 0); + subv(0, 1, -1, 0); + subv(-1, -1, 0, 0); + + return 0; +} diff --git a/tests/tcg/sh4/Makefile.target b/tests/tcg/sh4/Makefile.target index 521b8b0a76..7852fa62d8 100644 --- a/tests/tcg/sh4/Makefile.target +++ b/tests/tcg/sh4/Makefile.target @@ -20,3 +20,6 @@ TESTS += test-macw test-addv: CFLAGS += -O -g TESTS += test-addv + +test-subv: CFLAGS += -O -g +TESTS += test-subv From patchwork Tue Apr 30 16:31:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= X-Patchwork-Id: 793332 Delivered-To: patch@linaro.org Received: by 2002:a05:6000:54f:b0:34d:5089:5a9e with SMTP id b15csp358091wrf; Tue, 30 Apr 2024 09:33:06 -0700 (PDT) X-Forwarded-Encrypted: i=2; AJvYcCVFQ9vx7bGmB5KxpbaSum3/hvMcyAYW5UwP+UoxKjmc2iAysSz7IMKUFSDur4V1pJLf46UkCAAWJhQOd3ckweB4 X-Google-Smtp-Source: AGHT+IF/DFlhermVoD/lDKxhEQNDSwoVlXuHJwGCpCO+aPba6iB3z+6jA2woTiZOg2anfb++tmE8 X-Received: by 2002:a05:622a:1652:b0:43a:c0c7:a218 with SMTP id y18-20020a05622a165200b0043ac0c7a218mr511063qtj.33.1714494786087; Tue, 30 Apr 2024 09:33:06 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1714494786; cv=none; d=google.com; s=arc-20160816; b=OSWEXA/rdKh0VYC5/zNSWLdLp1/npJC/Kf2izAkkrIvVh62OJqTKD+9ETe+kwqAsdT mQLz5MuJDxRSAj579vN7gXJWgKuD0gB5xj8zjmZg3UsFWCY0IivTr9fRBM4gCNYFVDGY eWl2hPwvpzJV4XjIZh8yB4WzPUkkfbwI4fBMfptsXHnBSROobinym4KsU8PhM0nac9er 7knohn+t/UTDqmxEVOvzeacv+0W9vwwhxR8rgsGieAc/N9YmQzjqH3hppeaglrbDahUU kSNnpoC6N6NS8kz/xhpUSkNHPRp1X3Vn2ujMJA7iQBcYheweaQ7M6cDQBYPcicCVD3CN 3bjA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=l1JlWQ74k3ew3dFGdGKr3ZG9/zjKJQNhOFPSYmWrnhM=; fh=QRYhKNeHzM5K51dAZP498olhtbeEAy12/1W2oqyXvAA=; b=GWkGzn4iJor5pJvSZQ/mprcYYPxZMr1+/lwe8ipCp5yf4OaMlaUnsKOcayy4io5yc9 tcsLcK6OE3FROc723G3OnqdSgPVZvh26O0Kt2kJs+CSI7q+iptv9fQ7eGXK81ORlcqAD Tu1gDYS7ZNuDJ5mYTLm8QlHhXLVjam0ht41Dn0E5LljU3wI7j9Uujbt9GMmvNUN50QVO RsT5cI0SuYtst8Ku2VzzsRYdTtb5yGIF7bGsmGhtUiTJTzRD2s0f/iKdM8ePRRRyoEhD ll+BlGm3AXKMUqadfYHOwsW5T+vbSk0K8aMfYZZlB1fU2FunepkzcEy2uXd6JQHxsV3W VKVA==; dara=google.com ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=QLb4xMsM; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. 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[176.184.55.179]) by smtp.gmail.com with ESMTPSA id l16-20020a05600c4f1000b0041a1fee2854sm34744909wmq.17.2024.04.30.09.31.48 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 30 Apr 2024 09:31:49 -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 3/4] target/sh4: Rename TCGv variables as manual for ADDV opcode Date: Tue, 30 Apr 2024 18:31:24 +0200 Message-ID: <20240430163125.77430-4-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::231; envelope-from=philmd@linaro.org; helo=mail-lj1-x231.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 overflow is calculated. Signed-off-by: Philippe Mathieu-Daudé Reviewed-by: Richard Henderson 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 3e013b7c7c..47c0f3404e 100644 --- a/target/sh4/translate.c +++ b/target/sh4/translate.c @@ -705,16 +705,20 @@ static void _decode_opc(DisasContext * ctx) return; case 0x300f: /* addv Rm,Rn */ { - TCGv t0, t1, t2; - t0 = tcg_temp_new(); - tcg_gen_add_i32(t0, REG(B7_4), REG(B11_8)); + 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(B7_4), REG(B11_8)); + tcg_gen_add_i32(result, Rm, Rn); + /* T = ((Rn ^ Rm) & (Result ^ Rn)) >> 31 */ + tcg_gen_xor_i32(t1, result, Rn); + tcg_gen_xor_i32(t2, Rm, Rn); tcg_gen_andc_i32(cpu_sr_t, t1, t2); tcg_gen_shri_i32(cpu_sr_t, cpu_sr_t, 31); - tcg_gen_mov_i32(REG(B11_8), t0); + tcg_gen_mov_i32(Rn, result); } return; case 0x2009: /* and Rm,Rn */ From patchwork Tue Apr 30 16:31:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= X-Patchwork-Id: 793331 Delivered-To: patch@linaro.org Received: by 2002:a05:6000:54f:b0:34d:5089:5a9e with SMTP id b15csp357951wrf; Tue, 30 Apr 2024 09:32:49 -0700 (PDT) X-Forwarded-Encrypted: i=2; AJvYcCXi5qeS500FvWTfpL3EDWvFf8SobWcEWLufeztlF38vwIX5nkiTB/H/3Gv8aEdV6JjCkDGniUurFc85S1L6wDZA X-Google-Smtp-Source: AGHT+IHh4LrvsrIR4HkVmPiidjemLov8yjesfi0aRBDPlKZBsXs+ZvSrgVp0BomED2Mbplw1ogNQ X-Received: by 2002:a05:622a:190d:b0:43b:1546:f8a9 with SMTP id w13-20020a05622a190d00b0043b1546f8a9mr3942191qtc.51.1714494769522; Tue, 30 Apr 2024 09:32:49 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1714494769; cv=none; d=google.com; s=arc-20160816; b=t/wjVHTAbgal84TBvgKDD3kcdQyEwZTIb2wVZKIwNqf/kP/Xd4z9F+UqQXIGrrAYDu slBCMeVoSjo4yx6o8LBCfYfAXhVunY/qrPfwEpeQ0IjclGHDjyWgw9/OysaoTjodL9zA pM3NAh6mBD2nyzzoUwhCE71crGCf67TcE6D0b/iWHp5eaUL+XPVyevysc7UgM3v6JQeJ 8gK+zkkWNDaVzYU/uY9jIT5ekIJV08C1JY4GNE2KuoG1Ph8Wlu3RZgEnHDmukvOYbqFk VV2UErLzCUsr3jNGt0N09xWs9BjQ/WrhXFXVdW/LOxOO7j03IOBjyatPZsTWlq0P7bjo uMwA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:list-subscribe:list-help:list-post:list-archive :list-unsubscribe:list-id:precedence:content-transfer-encoding :mime-version:references:in-reply-to:message-id:date:subject:cc:to :from:dkim-signature; bh=TprQUrjgnD8N9rBUQzPSRwctmXsY08QQexwUVLZZZX4=; fh=QRYhKNeHzM5K51dAZP498olhtbeEAy12/1W2oqyXvAA=; b=QzdMzH7p8ZFtLb/8F2i8Z6j9ahPYp8kfkwLPZ99meWMfwkt5qe7eokeezOlZo5cbpd ThS/ouo35TOolq5gCmr4xvtzxRa4qul9z16OrypTlLtzqdtj4Z2cHCF0O7yGVXsmccTL BLUSQU3Hu+A6N0q4kvseOaW3/peMorlBpk/pdrur/51scV11rWypkVfj0U8OTtr/QRU7 +dfoo5YEGr0yIGh5q98VpkSX9KaMnrcc9Lg0/Ihu4Hl1LGfE5xdJgLC/mrKiwSK90Dn3 c1BOvjqXXuqOPmoDVpjEAA/Y30XBwp1mre22FWXAm4SNap65ccI3bscFg3aX1x+Syi5C hyqA==; dara=google.com ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=ZVK1Co47; spf=pass (google.com: domain of qemu-devel-bounces+patch=linaro.org@nongnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom="qemu-devel-bounces+patch=linaro.org@nongnu.org"; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from lists.gnu.org (lists.gnu.org. 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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 */