From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.ispras.ru (mail.ispras.ru [83.149.199.84]) by sourceware.org (Postfix) with ESMTPS id 16D823858407 for ; Tue, 5 Dec 2023 14:52:57 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 16D823858407 Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=ispras.ru Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=ispras.ru ARC-Filter: OpenARC Filter v1.0.0 sourceware.org 16D823858407 Authentication-Results: server2.sourceware.org; arc=none smtp.remote-ip=83.149.199.84 ARC-Seal: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1701787979; cv=none; b=lmBIuhrJnFTm0JRDPUfbT3Teonj1hPhtxBabDhZLW7nMH1sjy8uJIVLxpyGCtWCcqPGmWzRZ9KikJ+94zsfOIYvYihivWzHFauFXdczoCxmmdMhZ/4YTrS8yh2DoJeuA+a7YVqCrxGbmKR6CBb+bYtfpLMpqTS3G/iF+dW63bpc= ARC-Message-Signature: i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1701787979; c=relaxed/simple; bh=nEb6f0d6MP/jHqvw2eK/vTQvYGQxxLQW5Q6PvQ9tkwg=; h=Date:From:To:Subject:Message-ID:MIME-Version; b=WEQ8TkBV9jME7Hp20OAfM3DOjEf3iGJ04L3F1xt1XWnXCEx4gCaR02MEhlpXmvM2BKPeuka4Q2VPw5amJ3vp9QnH3PxzDQ1lovg0xLP82gXa3TCw870roauJp3KjD8CVoyJFZ+Ot9WYjfPouzPEmI3SsxVGc1vdgPN9Rgz62A0o= ARC-Authentication-Results: i=1; server2.sourceware.org Received: from [10.10.3.121] (unknown [10.10.3.121]) by mail.ispras.ru (Postfix) with ESMTPS id 4449840737A3 for ; Tue, 5 Dec 2023 14:52:55 +0000 (UTC) DKIM-Filter: OpenDKIM Filter v2.11.0 mail.ispras.ru 4449840737A3 Date: Tue, 5 Dec 2023 17:52:55 +0300 (MSK) From: Alexander Monakov To: gcc@gcc.gnu.org Subject: NOP_EXPR vs. CONVERT_EXPR Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00,KAM_DMARC_STATUS,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE 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: Greetings, the definitions for NOP_EXPR and CONVERT_EXPR in tree.def, having survived all the way from 1992, currently say: /* Represents a conversion of type of a value. All conversions, including implicit ones, must be represented by CONVERT_EXPR or NOP_EXPR nodes. */ DEFTREECODE (CONVERT_EXPR, "convert_expr", tcc_unary, 1) /* Represents a conversion expected to require no code to be generated. */ DEFTREECODE (NOP_EXPR, "nop_expr", tcc_unary, 1) Unfortunately, they are confusing, as in float f(double d) { return d; } the narrowing conversion is represented with NOP_EXPR, and it is definitely not a no-op. Does some clear distinction remain, and is it possible to clarify the definitions? Thanks. Alexander