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Sun, 26 Apr 2026 06:46:27 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH 73/84] fpu: Introduce record_denormals_used Date: Sun, 26 Apr 2026 23:39:50 +1000 Message-ID: <20260426134002.865628-74-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260426134002.865628-1-richard.henderson@linaro.org> References: <20260426134002.865628-1-richard.henderson@linaro.org> 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=lists1p.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::633; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x633.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: 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 @linaro.org) X-ZM-MESSAGEID: 1777211830382154100 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson --- fpu/softfloat.c | 8 +++++++ fpu/softfloat-parts.c.inc | 49 +++++++++++---------------------------- 2 files changed, 22 insertions(+), 35 deletions(-) diff --git a/fpu/softfloat.c b/fpu/softfloat.c index 0c931842c3..1423695a5a 100644 --- a/fpu/softfloat.c +++ b/fpu/softfloat.c @@ -442,6 +442,14 @@ static inline bool is_anynorm(FloatClass c) return float_cmask(c) & float_cmask_anynorm; } =20 +/* Record when denormals have been used. */ +static void record_denormals_used(int mask, float_status *s) +{ + if (unlikely(mask & float_cmask_denormal)) { + float_raise(float_flag_input_denormal_used, s); + } +} + /* FloatParts256 is entirely internal, for parts128_mul* */ typedef struct { FloatClass cls; diff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc index 5eaac357ec..82d59df406 100644 --- a/fpu/softfloat-parts.c.inc +++ b/fpu/softfloat-parts.c.inc @@ -534,9 +534,8 @@ static FloatPartsN *partsN(addsub)(FloatPartsN *a, Floa= tPartsN *b, * For addition and subtraction, we will consume an * input denormal unless the other input is a NaN. */ - if ((ab_mask & (float_cmask_denormal | float_cmask_anynan)) =3D=3D - float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); + if (!(ab_mask & float_cmask_anynan)) { + record_denormals_used(ab_mask, s); } =20 if (a->sign !=3D b_sign) { @@ -623,9 +622,7 @@ static FloatPartsN *partsN(mul)(FloatPartsN *a, FloatPa= rtsN *b, if (likely(cmask_is_only_normals(ab_mask))) { FloatPartsW tmp; =20 - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); =20 fracN(mulw)(&tmp, a, b); fracN(truncjam)(a, &tmp); @@ -653,9 +650,7 @@ static FloatPartsN *partsN(mul)(FloatPartsN *a, FloatPa= rtsN *b, } =20 /* Multiply by 0 or Inf */ - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); =20 if (ab_mask & float_cmask_inf) { a->cls =3D float_class_inf; @@ -784,9 +779,7 @@ static FloatPartsN *partsN(muladd_scalbn)(FloatPartsN *= a, FloatPartsN *b, * this matches the set of cases where we consumed a * denormal input. */ - if (abc_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(abc_mask, s); return a; =20 return_sub_zero: @@ -819,9 +812,7 @@ FloatPartsN partsN(div)(const FloatPartsN *a, const Flo= atPartsN *b, r.exp -=3D b->exp; =20 if (likely(cmask_is_only_normals(ab_mask))) { - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); r.exp -=3D fracN(div)(&r, b); return r; } @@ -841,8 +832,8 @@ FloatPartsN partsN(div)(const FloatPartsN *a, const Flo= atPartsN *b, return partsN(pick_nan)(a, b, s); } =20 - if ((ab_mask & float_cmask_denormal) && b->cls !=3D float_class_zero) { - float_raise(float_flag_input_denormal_used, s); + if (b->cls !=3D float_class_zero) { + record_denormals_used(ab_mask, s); } =20 /* Inf / X */ @@ -877,9 +868,7 @@ static FloatPartsN *partsN(modrem)(FloatPartsN *a, Floa= tPartsN *b, int ab_mask =3D float_cmask(a->cls) | float_cmask(b->cls); =20 if (likely(cmask_is_only_normals(ab_mask))) { - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); fracN(modrem)(a, b, mod_quot); return a; } @@ -901,9 +890,7 @@ static FloatPartsN *partsN(modrem)(FloatPartsN *a, Floa= tPartsN *b, return a; } =20 - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); =20 /* N % Inf; 0 % N */ g_assert(b->cls =3D=3D float_class_inf || a->cls =3D=3D float_class_ze= ro); @@ -1493,9 +1480,7 @@ static FloatPartsN *partsN(minmax)(FloatPartsN *a, Fl= oatPartsN *b, if ((flags & (minmax_isnum | minmax_isnumber)) && !(ab_mask & float_cmask_snan) && (ab_mask & ~float_cmask_qnan)) { - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); return is_nan(a->cls) ? b : a; } =20 @@ -1521,9 +1506,7 @@ static FloatPartsN *partsN(minmax)(FloatPartsN *a, Fl= oatPartsN *b, return a; } =20 - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); =20 a_exp =3D a->exp; b_exp =3D b->exp; @@ -1594,9 +1577,7 @@ static FloatRelation partsN(compare)(FloatPartsN *a, = FloatPartsN *b, if (likely(cmask_is_only_normals(ab_mask))) { FloatRelation cmp; =20 - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); =20 if (a->sign !=3D b->sign) { goto a_sign; @@ -1623,9 +1604,7 @@ static FloatRelation partsN(compare)(FloatPartsN *a, = FloatPartsN *b, return float_relation_unordered; } =20 - if (ab_mask & float_cmask_denormal) { - float_raise(float_flag_input_denormal_used, s); - } + record_denormals_used(ab_mask, s); =20 if (ab_mask & float_cmask_zero) { if (ab_mask =3D=3D float_cmask_zero) { --=20 2.43.0