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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42baf7fa745sm64189335e9.31.2024.08.30.08.21.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Aug 2024 08:21:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; t=1725031318; x=1725636118; darn=nongnu.org; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:from:to:cc:subject:date:message-id:reply-to; bh=NG8BT4wk2wwlWq+dR+64QDBVzrTHfzbABoSBLNWlxsw=; b=sY0Fd/vx3s8XNB/yAfZQ5T/BaQYS9MZtkDFXhm+oHK/HzF0d1zf0rKfWjCljeuhE5M 8zoxxWxndZOiLK0JDhdwNVv6QwEHYEw6SuG3a4gwAB75OTmAueFu6iD7iVrQwYZRWbPA +6Nab2+P4pzwJzmdzYE4yY/ksjxDw984jKebZV1t4QShM1RIIajce58wF0nk9vEdSpIe VGIvCQkcCqTA/pHzYQzu3B1o518Fn0mqnUANnP0aTpgLBjhJsFv5SxVqYvMmI5yJp7zZ /pCJdlAIkSWjhnpp8umpSR2Hug9yDl6HxH5ig828CCcKNnTqjqb2IgMHm/IxqN/ztFK2 V4Yw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725031318; x=1725636118; h=content-transfer-encoding:mime-version:message-id:date:subject:to :from:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=NG8BT4wk2wwlWq+dR+64QDBVzrTHfzbABoSBLNWlxsw=; b=V+WFTRSDBEMNsOiJCUOh0fr+2ndxCXmxvZDZjIQf8WfLeb5tViI9qpKQIToj8Hw7IA lfPfuLr14vKf7HFUobHWvpdnNXkE6n94nHbeyey7mLsXUn5WD1vtu/+d+xZWK/VLayrm lQpsdoWJVQ8noqDtI4KdGdB2zyxeF6ObFDOjunhNIA9qWTcyq0atW/htMkf///KCY/9O VjaW9FWLanSbH7P6aQHto55iuZZ5dr/8oAJGBWBUtGyaYnIYRtrtJ1s5M6fPWmxs+ngq iYRq2uj+2/q+p2shdZpFFk2OVu80tstb0LtsDuIy4OUCee0oxMQvog7CZenb/uq4VYVk NxHg== X-Forwarded-Encrypted: i=1; AJvYcCXpop9ivvHGTB6z8aE5Iz4xH/QOvsPnSSzxVyNp8JFZyn0+6EnchEVFH5ccvFHL/qBIV8pw61STQh/B@nongnu.org X-Gm-Message-State: AOJu0Yzh0r15a9Ed4Q5Mfyr2l8697dAXPTmtPsYa4tC9BWmhoCB+EYv/ YaxEvAGsyPFy7wQOe8D06M3fa4zZbMpW2q+LLzZx9hfv2u/bFudUYzK4aPTU/g0= X-Google-Smtp-Source: AGHT+IGT2eFd6PocgYn56pDYLo3KpN5DuZIKP7JXWUH7FelK2ws5vl2HuwYwQyqnoPT1Vy2/pO0dig== X-Received: by 2002:a7b:ce0d:0:b0:428:17b6:bcf1 with SMTP id 5b1f17b1804b1-42bb01c225bmr53225295e9.22.1725031317417; Fri, 30 Aug 2024 08:21:57 -0700 (PDT) From: Peter Maydell To: qemu-arm@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH] target/arm: Correct names of VFP VFNMA and VFNMS insns Date: Fri, 30 Aug 2024 16:21:56 +0100 Message-Id: <20240830152156.2046590-1-peter.maydell@linaro.org> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::335; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x335.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, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1725031386939116600 Content-Type: text/plain; charset="utf-8" In vfp.decode we have the names of the VFNMA and VFNMS instructions the wrong way around. The architecture says that bit 6 is the 'op' bit, which is 1 for VFNMA and 1 for VFNMS, but we label these two lines of decode the other way around. This doesn't cause any user-visible problem because in the handling of these functions in translate-vfp.c we give VFNMA the behaviour specified for VFNMS and vice-versa, but it's confusing when reading the code. Switch the names of the VFP VFNMA and VFNMS instructions in the decode file and flip the behaviour also. NB: the instructions VFMA and VFMS *are* decoded with op=3D0 for VFMA and op=3D1 for VFMS; the confusion probably arose because we assumed VFNMA and VFNMS to be the same way around. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2536 Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson --- target/arm/tcg/vfp.decode | 12 ++++++------ target/arm/tcg/translate-vfp.c | 8 ++++---- 2 files changed, 10 insertions(+), 10 deletions(-) diff --git a/target/arm/tcg/vfp.decode b/target/arm/tcg/vfp.decode index 5405e80197b..2dd87a27089 100644 --- a/target/arm/tcg/vfp.decode +++ b/target/arm/tcg/vfp.decode @@ -141,18 +141,18 @@ VDIV_dp ---- 1110 1.00 .... .... 1011 .0.0 .... = @vfp_dnm_d =20 VFMA_hp ---- 1110 1.10 .... .... 1001 .0. 0 .... @vfp_dnm_s VFMS_hp ---- 1110 1.10 .... .... 1001 .1. 0 .... @vfp_dnm_s -VFNMA_hp ---- 1110 1.01 .... .... 1001 .0. 0 .... @vfp_dnm_s -VFNMS_hp ---- 1110 1.01 .... .... 1001 .1. 0 .... @vfp_dnm_s +VFNMS_hp ---- 1110 1.01 .... .... 1001 .0. 0 .... @vfp_dnm_s +VFNMA_hp ---- 1110 1.01 .... .... 1001 .1. 0 .... @vfp_dnm_s =20 VFMA_sp ---- 1110 1.10 .... .... 1010 .0. 0 .... @vfp_dnm_s VFMS_sp ---- 1110 1.10 .... .... 1010 .1. 0 .... @vfp_dnm_s -VFNMA_sp ---- 1110 1.01 .... .... 1010 .0. 0 .... @vfp_dnm_s -VFNMS_sp ---- 1110 1.01 .... .... 1010 .1. 0 .... @vfp_dnm_s +VFNMS_sp ---- 1110 1.01 .... .... 1010 .0. 0 .... @vfp_dnm_s +VFNMA_sp ---- 1110 1.01 .... .... 1010 .1. 0 .... @vfp_dnm_s =20 VFMA_dp ---- 1110 1.10 .... .... 1011 .0.0 .... @vfp_dnm_d VFMS_dp ---- 1110 1.10 .... .... 1011 .1.0 .... @vfp_dnm_d -VFNMA_dp ---- 1110 1.01 .... .... 1011 .0.0 .... @vfp_dnm_d -VFNMS_dp ---- 1110 1.01 .... .... 1011 .1.0 .... @vfp_dnm_d +VFNMS_dp ---- 1110 1.01 .... .... 1011 .0.0 .... @vfp_dnm_d +VFNMA_dp ---- 1110 1.01 .... .... 1011 .1.0 .... @vfp_dnm_d =20 VMOV_imm_hp ---- 1110 1.11 .... .... 1001 0000 .... \ vd=3D%vd_sp imm=3D%vmov_imm diff --git a/target/arm/tcg/translate-vfp.c b/target/arm/tcg/translate-vfp.c index cd5b8483576..b6fa28a7bf6 100644 --- a/target/arm/tcg/translate-vfp.c +++ b/target/arm/tcg/translate-vfp.c @@ -2190,8 +2190,8 @@ static bool do_vfm_sp(DisasContext *s, arg_VFMA_sp *a= , bool neg_n, bool neg_d) static bool do_vfm_dp(DisasContext *s, arg_VFMA_dp *a, bool neg_n, bool ne= g_d) { /* - * VFNMA : fd =3D muladd(-fd, fn, fm) - * VFNMS : fd =3D muladd(-fd, -fn, fm) + * VFNMA : fd =3D muladd(-fd, -fn, fm) + * VFNMS : fd =3D muladd(-fd, fn, fm) * VFMA : fd =3D muladd( fd, fn, fm) * VFMS : fd =3D muladd( fd, -fn, fm) * @@ -2262,8 +2262,8 @@ static bool do_vfm_dp(DisasContext *s, arg_VFMA_dp *a= , bool neg_n, bool neg_d) #define MAKE_VFM_TRANS_FNS(PREC) \ MAKE_ONE_VFM_TRANS_FN(VFMA, PREC, false, false) \ MAKE_ONE_VFM_TRANS_FN(VFMS, PREC, true, false) \ - MAKE_ONE_VFM_TRANS_FN(VFNMA, PREC, false, true) \ - MAKE_ONE_VFM_TRANS_FN(VFNMS, PREC, true, true) + MAKE_ONE_VFM_TRANS_FN(VFNMS, PREC, false, true) \ + MAKE_ONE_VFM_TRANS_FN(VFNMA, PREC, true, true) =20 MAKE_VFM_TRANS_FNS(hp) MAKE_VFM_TRANS_FNS(sp) --=20 2.34.1