{"id":2227673,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2227673/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260424043014.46305-21-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":"<20260424043014.46305-21-richard.henderson@linaro.org>","date":"2026-04-24T04:29:54","name":"[v2,20/40] fpu: Add conversions between float16 and float8 formats","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"21d5e60b091a9e1dcbfd3aa26955d6009c0a7552","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/20260424043014.46305-21-richard.henderson@linaro.org/mbox/","series":[{"id":501300,"url":"http://patchwork.ozlabs.org/api/1.1/series/501300/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=501300","date":"2026-04-24T04:29:37","name":"target/arm: Implement FEAT_FP8","version":2,"mbox":"http://patchwork.ozlabs.org/series/501300/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2227673/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2227673/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=EkJa14i6;\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 4g20Sv4kqpz1yDD\n\tfor ; Fri, 24 Apr 2026 14:33:19 +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 1wG8DE-0001P9-Jq; Fri, 24 Apr 2026 00:32:20 -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 1wG8Ck-0007zC-70\n for qemu-devel@nongnu.org; Fri, 24 Apr 2026 00:31:50 -0400","from mail-ot1-x330.google.com ([2607:f8b0:4864:20::330])\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 1wG8Ci-0002zH-8P\n for qemu-devel@nongnu.org; Fri, 24 Apr 2026 00:31:49 -0400","by mail-ot1-x330.google.com with SMTP id\n 46e09a7af769-7dcc9b506d9so4232594a34.1\n for ; Thu, 23 Apr 2026 21:31:47 -0700 (PDT)","from stoup.. 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helo=mail-ot1-x330.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 include/fpu/softfloat.h | 8 +++++++-\n fpu/softfloat.c | 38 ++++++++++++++++++++++++++++++++++++++\n 2 files changed, 45 insertions(+), 1 deletion(-)","diff":"diff --git a/include/fpu/softfloat.h b/include/fpu/softfloat.h\nindex 6f86848b7e..70e25fa811 100644\n--- a/include/fpu/softfloat.h\n+++ b/include/fpu/softfloat.h\n@@ -196,16 +196,22 @@ float128 uint128_to_float128(Int128, float_status *status);\n float8_e4m3 float4_e2m1_to_float8_e4m3(float4_e2m1, float_status *status);\n \n bfloat16 float8_e4m3_to_bfloat16(float8_e4m3, int scale, float_status *status);\n+float16 float8_e4m3_to_float16(float8_e4m3, int scale, float_status *status);\n float8_e4m3 bfloat16_to_float8_e4m3(bfloat16, int scale,\n bool sat, float_status *status);\n+float8_e4m3 float16_to_float8_e4m3(float16, int scale,\n+ bool sat, float_status *status);\n float8_e4m3 float32_to_float8_e4m3(float32, int scale,\n bool sat, float_status *status);\n \n bfloat16 float8_e5m2_to_bfloat16(float8_e5m2, int scale, float_status *status);\n+float16 float8_e5m2_to_float16(float8_e5m2, int scale, float_status *status);\n float8_e5m2 bfloat16_to_float8_e5m2(bfloat16, int scale,\n bool sat, float_status *status);\n+float8_e5m2 float16_to_float8_e5m2(float16, int scale,\n+ bool sat, float_status *status);\n float8_e5m2 float32_to_float8_e5m2(float32, int scale,\n- bool sat, float_status *status);\n+ bool sat, float_status *status);\n \n /*----------------------------------------------------------------------------\n | Software half-precision conversion routines.\ndiff --git a/fpu/softfloat.c b/fpu/softfloat.c\nindex bcec7d38c8..013b6e1ee2 100644\n--- a/fpu/softfloat.c\n+++ b/fpu/softfloat.c\n@@ -2958,6 +2958,15 @@ float8_e4m3 float4_e2m1_to_float8_e4m3(float4_e2m1 a, float_status *s)\n return float8_e4m3_round_pack_canonical(&p, s, false);\n }\n \n+float16 float8_e4m3_to_float16(float8_e4m3 a, int scale, float_status *s)\n+{\n+ FloatParts64 p;\n+\n+ float8_e4m3_unpack_canonical(&p, a, s);\n+ parts_scalbn(&p, scale, s);\n+ return float16_round_pack_canonical(&p, s);\n+}\n+\n bfloat16 float8_e4m3_to_bfloat16(float8_e4m3 a, int scale, float_status *s)\n {\n FloatParts64 p;\n@@ -2967,6 +2976,15 @@ bfloat16 float8_e4m3_to_bfloat16(float8_e4m3 a, int scale, float_status *s)\n return bfloat16_round_pack_canonical(&p, s);\n }\n \n+float16 float8_e5m2_to_float16(float8_e5m2 a, int scale, float_status *s)\n+{\n+ FloatParts64 p;\n+\n+ float8_e5m2_unpack_canonical(&p, a, s);\n+ parts_scalbn(&p, scale, s);\n+ return float16_round_pack_canonical(&p, s);\n+}\n+\n bfloat16 float8_e5m2_to_bfloat16(float8_e5m2 a, int scale, float_status *s)\n {\n FloatParts64 p;\n@@ -2976,6 +2994,26 @@ bfloat16 float8_e5m2_to_bfloat16(float8_e5m2 a, int scale, float_status *s)\n return bfloat16_round_pack_canonical(&p, s);\n }\n \n+float8_e4m3 float16_to_float8_e4m3(float16 a, int scale,\n+ bool saturate, float_status *s)\n+{\n+ FloatParts64 p;\n+\n+ float16_unpack_canonical(&p, a, s);\n+ parts_scalbn(&p, scale, s);\n+ return float8_e4m3_round_pack_canonical(&p, s, saturate);\n+}\n+\n+float8_e5m2 float16_to_float8_e5m2(float16 a, int scale,\n+ bool saturate, float_status *s)\n+{\n+ FloatParts64 p;\n+\n+ float16_unpack_canonical(&p, a, s);\n+ parts_float_to_e5m2(&p, s, scale, saturate);\n+ return float8_e5m2_round_pack_canonical(&p, s, saturate);\n+}\n+\n float32 float16_to_float32(float16 a, bool ieee, float_status *s)\n {\n const FloatFmt *fmt16 = ieee ? &float16_params : &float16_params_ahp;\n","prefixes":["v2","20/40"]}