From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg1-x52a.google.com (mail-pg1-x52a.google.com [IPv6:2607:f8b0:4864:20::52a]) by sourceware.org (Postfix) with ESMTPS id C35E03858438 for ; Mon, 19 Sep 2022 13:23:08 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org C35E03858438 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pg1-x52a.google.com with SMTP id 78so26710620pgb.13 for ; Mon, 19 Sep 2022 06:23:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=to:subject:message-id:date:from:mime-version:from:to:cc:subject :date; bh=wR3ZuhnlCLD/8x6HbXkxie6IUPKvRUU3LBlzA8Ii7Zc=; b=XXK6oceXQr+YxgyU9WLGQwo8wyPw4imHdzP5hcAHVQGa2Awsz9e1JYI2gm99n4RGgK cW/wz9QiRSrzZC+He511kWzJhahdNvRsb5XIQezwGnJIr/4rRrIWi2SS8FnLMlFMBvgn Uu8S16DTlSXzLtz44egOeGpYn0CAjvkjPz+d9+WeIMXfquHVjUggmP2jK4ydsn3US8Ez rSJWjpY0aRijao+cSr2JyeE/cnK6myM8pRs0YDwUyg76XUAr4zwHHFGOunD9KOHtgfcT Eg0lU7f0zkEU/jDIw04FLeI2DslIqW+SbrhwiV65BxfY4kTul8MyvuPBmy9oE+srMbhH JOmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:subject:message-id:date:from:mime-version:x-gm-message-state :from:to:cc:subject:date; bh=wR3ZuhnlCLD/8x6HbXkxie6IUPKvRUU3LBlzA8Ii7Zc=; b=PGlhBbr0Qx7FN3392VHz0buJ2AEgi5r287zx5edjBkO0odzBmVCOnFXLF5AVGqdpQF S1AW863X8Ph4CanNiHEVmAJP3tHCzrTtwF464ihPbt2FUp1CWqapJvdoIoEEVdN2K82T oItQz21Jc3ALu19QF8gGiKr4sZhwVHoB+01hfEUGE0e7UNTablzBHNgbJTL3iSQoDSUB SUJQsOfDYrnk2fVF18J/pAM3UfpOUWVbdwbq/u4MpkTaI6Rfp2+9xw5UwUJxfuDyHHtf kU1SmE/oPWRoF7EMgCG1EHYK5YYRX3P4IBTHl6UDbsOT1dNXuUWz8ak+KhornA8Lh9gQ s5lg== X-Gm-Message-State: ACrzQf0dW7vM2iwtyPjyeEUPzJLOV5M1xmK5Ow700/IreHF8SnkdKTJ4 LIoNA8hDAAl6cpusPLNuDjUbFf6A6HQUSQVnrw9GCp77S98= X-Google-Smtp-Source: AMsMyM4lm5iBN3Ku5LBc0YOzo6X/b764YjEKVmpFmjYRGFG2FfUho3Ua1B6O+zUmtt3aWj9sqfPSIZ+nQmsZ5xvHMEQ= X-Received: by 2002:a63:cc43:0:b0:43a:2f12:d326 with SMTP id q3-20020a63cc43000000b0043a2f12d326mr3316760pgi.320.1663593787332; Mon, 19 Sep 2022 06:23:07 -0700 (PDT) MIME-Version: 1.0 From: pengsheng.chen@gmail.com Date: Mon, 19 Sep 2022 21:22:55 +0800 Message-ID: Subject: When does GCC need to use the functions decode_ieee_single()/decode_ieee_double() ? To: gcc@gcc.gnu.org Content-Type: multipart/alternative; boundary="000000000000bea02505e9079ca8" X-Spam-Status: No, score=-0.4 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,HTML_MESSAGE,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: --000000000000bea02505e9079ca8 Content-Type: text/plain; charset="UTF-8" Dear all, The functions encode_ieee_single()/encode_ieee_double() encode the GCC internal representation (i.e., REAL_VALUE_TYPE) to the corresponding IEEE single precision/double precision formats. The constant values in a program (i.e., float a = 3.14;) will be parsed and then transferred to GCC REAL_VALUE_TYPE. Later, the REAL_VALUE_TYPE is encoded to IEEE single/double formats. However, I do not know why we need decode_ieee_single()/decode_ieee_double()? Which situations or C code fragments are these decode_ieee_xxx functions used in? Thank you for your help. Peng-Sheng --000000000000bea02505e9079ca8--