{"id":2230701,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230701/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260430000524.56046-24-richard.henderson@linaro.org/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.1/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260430000524.56046-24-richard.henderson@linaro.org>","date":"2026-04-30T00:05:06","name":"[v2,23/40] fpu: Introduce record_denormals_used","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"bdc143cb8eb1f6ab71335bc9e5a1e650339ddf9a","submitter":{"id":72104,"url":"http://patchwork.ozlabs.org/api/1.1/people/72104/?format=json","name":"Richard Henderson","email":"richard.henderson@linaro.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260430000524.56046-24-richard.henderson@linaro.org/mbox/","series":[{"id":502170,"url":"http://patchwork.ozlabs.org/api/1.1/series/502170/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502170","date":"2026-04-30T00:04:48","name":"fpu: Export some internals for targets","version":2,"mbox":"http://patchwork.ozlabs.org/series/502170/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230701/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230701/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256\n header.s=google header.b=EWVT3mH3;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; helo=lists1p.gnu.org;\n envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from lists1p.gnu.org (lists1p.gnu.org [209.51.188.17])\n\t(using TLSv1.2 with cipher ECDHE-ECDSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g5ZMT569zz1yHv\n\tfor ; Thu, 30 Apr 2026 10:11:01 +1000 (AEST)","from localhost ([::1] helo=lists1p.gnu.org)\n\tby lists1p.gnu.org with esmtp (Exim 4.90_1)\n\t(envelope-from )\n\tid 1wIEvu-0000O1-Px; Wed, 29 Apr 2026 20:07:11 -0400","from eggs.gnu.org ([2001:470:142:3::10])\n by lists1p.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256)\n (Exim 4.90_1) (envelope-from )\n id 1wIEvA-0007jg-FM\n for qemu-devel@nongnu.org; Wed, 29 Apr 2026 20:06:26 -0400","from mail-pf1-x431.google.com ([2607:f8b0:4864:20::431])\n by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)\n (Exim 4.90_1) (envelope-from )\n id 1wIEv8-0001rQ-Mr\n for qemu-devel@nongnu.org; Wed, 29 Apr 2026 20:06:24 -0400","by mail-pf1-x431.google.com with SMTP id\n d2e1a72fcca58-82d0b68837aso184885b3a.2\n for ; Wed, 29 Apr 2026 17:06:22 -0700 (PDT)","from stoup.. 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helo=mail-pf1-x431.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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"Signed-off-by: Richard Henderson \n---\n fpu/softfloat.c | 8 +++++++\n fpu/softfloat-parts.c.inc | 49 +++++++++++----------------------------\n 2 files changed, 22 insertions(+), 35 deletions(-)","diff":"diff --git a/fpu/softfloat.c b/fpu/softfloat.c\nindex 4efafbf05a..168181858f 100644\n--- a/fpu/softfloat.c\n+++ b/fpu/softfloat.c\n@@ -442,6 +442,14 @@ static inline bool is_anynorm(FloatClass c)\n return float_cmask(c) & float_cmask_anynorm;\n }\n \n+/* Record when denormals have been used. */\n+static void record_denormals_used(int mask, float_status *s)\n+{\n+ if (unlikely(mask & float_cmask_denormal)) {\n+ float_raise(float_flag_input_denormal_used, s);\n+ }\n+}\n+\n /* FloatParts256 is entirely internal, for parts128_mul* */\n typedef struct {\n FloatClass cls;\ndiff --git a/fpu/softfloat-parts.c.inc b/fpu/softfloat-parts.c.inc\nindex 211ecdf114..028c2daa27 100644\n--- a/fpu/softfloat-parts.c.inc\n+++ b/fpu/softfloat-parts.c.inc\n@@ -534,9 +534,8 @@ static FloatPartsN *partsN(addsub)(FloatPartsN *a, FloatPartsN *b,\n * For addition and subtraction, we will consume an\n * input denormal unless the other input is a NaN.\n */\n- if ((ab_mask & (float_cmask_denormal | float_cmask_anynan)) ==\n- float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n+ if (!(ab_mask & float_cmask_anynan)) {\n+ record_denormals_used(ab_mask, s);\n }\n \n if (a->sign != b_sign) {\n@@ -623,9 +622,7 @@ static FloatPartsN *partsN(mul)(FloatPartsN *a, FloatPartsN *b,\n if (likely(cmask_is_only_normals(ab_mask))) {\n FloatPartsW tmp;\n \n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n \n fracN(mulw)(&tmp, a, b);\n fracN(truncjam)(a, &tmp);\n@@ -653,9 +650,7 @@ static FloatPartsN *partsN(mul)(FloatPartsN *a, FloatPartsN *b,\n }\n \n /* Multiply by 0 or Inf */\n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n \n if (ab_mask & float_cmask_inf) {\n a->cls = float_class_inf;\n@@ -784,9 +779,7 @@ static FloatPartsN *partsN(muladd_scalbn)(FloatPartsN *a, FloatPartsN *b,\n * this matches the set of cases where we consumed a\n * denormal input.\n */\n- if (abc_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(abc_mask, s);\n return a;\n \n return_sub_zero:\n@@ -819,9 +812,7 @@ FloatPartsN partsN(div)(const FloatPartsN *a, const FloatPartsN *b,\n r.exp -= b->exp;\n \n if (likely(cmask_is_only_normals(ab_mask))) {\n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n r.exp -= fracN(div)(&r, b);\n return r;\n }\n@@ -841,8 +832,8 @@ FloatPartsN partsN(div)(const FloatPartsN *a, const FloatPartsN *b,\n return partsN(pick_nan)(a, b, s);\n }\n \n- if ((ab_mask & float_cmask_denormal) && b->cls != float_class_zero) {\n- float_raise(float_flag_input_denormal_used, s);\n+ if (b->cls != float_class_zero) {\n+ record_denormals_used(ab_mask, s);\n }\n \n /* Inf / X */\n@@ -877,9 +868,7 @@ static FloatPartsN *partsN(modrem)(FloatPartsN *a, FloatPartsN *b,\n int ab_mask = float_cmask(a->cls) | float_cmask(b->cls);\n \n if (likely(cmask_is_only_normals(ab_mask))) {\n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n fracN(modrem)(a, b, mod_quot);\n return a;\n }\n@@ -901,9 +890,7 @@ static FloatPartsN *partsN(modrem)(FloatPartsN *a, FloatPartsN *b,\n return a;\n }\n \n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n \n /* N % Inf; 0 % N */\n g_assert(b->cls == float_class_inf || a->cls == float_class_zero);\n@@ -1493,9 +1480,7 @@ static FloatPartsN *partsN(minmax)(FloatPartsN *a, FloatPartsN *b,\n if ((flags & (minmax_isnum | minmax_isnumber))\n && !(ab_mask & float_cmask_snan)\n && (ab_mask & ~float_cmask_qnan)) {\n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n return is_nan(a->cls) ? b : a;\n }\n \n@@ -1521,9 +1506,7 @@ static FloatPartsN *partsN(minmax)(FloatPartsN *a, FloatPartsN *b,\n return a;\n }\n \n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n \n a_exp = a->exp;\n b_exp = b->exp;\n@@ -1594,9 +1577,7 @@ static FloatRelation partsN(compare)(FloatPartsN *a, FloatPartsN *b,\n if (likely(cmask_is_only_normals(ab_mask))) {\n FloatRelation cmp;\n \n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n \n if (a->sign != b->sign) {\n goto a_sign;\n@@ -1623,9 +1604,7 @@ static FloatRelation partsN(compare)(FloatPartsN *a, FloatPartsN *b,\n return float_relation_unordered;\n }\n \n- if (ab_mask & float_cmask_denormal) {\n- float_raise(float_flag_input_denormal_used, s);\n- }\n+ record_denormals_used(ab_mask, s);\n \n if (ab_mask & float_cmask_zero) {\n if (ab_mask == float_cmask_zero) {\n","prefixes":["v2","23/40"]}