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Thu, 19 Mar 2026 16:26:04 -0700 (PDT) From: alistair23@gmail.com X-Google-Original-From: alistair.francis@wdc.com To: qemu-devel@nongnu.org Cc: alistair23@gmail.com, Max Chou , Chao Liu , Richard Henderson , Alistair Francis Subject: [PULL 08/17] fpu: Fix unexpected exception flags when converting infinity to OCP E4M3 Date: Fri, 20 Mar 2026 09:25:13 +1000 Message-ID: <20260319232522.1867400-9-alistair.francis@wdc.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260319232522.1867400-1-alistair.francis@wdc.com> References: <20260319232522.1867400-1-alistair.francis@wdc.com> 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=2607:f8b0:4864:20::102e; envelope-from=alistair23@gmail.com; helo=mail-pj1-x102e.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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, FREEMAIL_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, 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: qemu development 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 @gmail.com) X-ZM-MESSAGEID: 1773962799582154100 Content-Type: text/plain; charset="utf-8" From: Max Chou Infinity is a special case distinct from numeric overflow: - Numeric overflow: finite value exceeds format's max normal -> overflow|inexact - Infinity conversion: input is already infinite -> no flags This commit fixes the unexpect exception flags by relocating the float exception flag update flow to be outside the uncanon_e4m3_overflow. And raising the overflow|inexact for numeric overflow in uncanon_normal. Fixes: 27e989f99c ("fpu: Add conversion routines for OCP FP8 E4M3") Reviewed-by: Chao Liu Reviewed-by: Richard Henderson Signed-off-by: Max Chou Message-ID: <20260226071817.1417875-3-max.chou@sifive.com> Signed-off-by: Alistair Francis --- fpu/softfloat-parts.c.inc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc index a738758aee..3c323c0cec 100644 --- a/fpu/softfloat-parts.c.inc +++ b/fpu/softfloat-parts.c.inc @@ -277,7 +277,6 @@ static void partsN(uncanon_e4m3_overflow)(FloatPartsN *= p, float_status *s, const FloatFmt *fmt, bool satura= te) { assert(N =3D=3D 64); - float_raise(float_flag_overflow | float_flag_inexact, s); if (saturate) { p->exp =3D fmt->exp_max; p->frac_hi =3D E4M3_NORMAL_FRAC_MAX; @@ -388,6 +387,7 @@ static void partsN(uncanon_normal)(FloatPartsN *p, floa= t_status *s, if (exp > exp_max || p->frac_hi > E4M3_NORMAL_FRAC_MAX) { partsN(uncanon_e4m3_overflow)(p, s, fmt, overflow_norm= ); exp =3D p->exp; + flags |=3D (float_flag_overflow | float_flag_inexact); } break; =20 --=20 2.53.0