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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) 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 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org 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=0 for VFMA and op=1 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 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 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 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 VMOV_imm_hp ---- 1110 1.11 .... .... 1001 0000 .... \ vd=%vd_sp imm=%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 neg_d) { /* - * VFNMA : fd = muladd(-fd, fn, fm) - * VFNMS : fd = muladd(-fd, -fn, fm) + * VFNMA : fd = muladd(-fd, -fn, fm) + * VFNMS : fd = muladd(-fd, fn, fm) * VFMA : fd = muladd( fd, fn, fm) * VFMS : fd = 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) MAKE_VFM_TRANS_FNS(hp) MAKE_VFM_TRANS_FNS(sp)