From patchwork Fri Apr 1 16:32:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xi Ruoyao X-Patchwork-Id: 52581 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 706E93858434 for ; Fri, 1 Apr 2022 16:33:19 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 706E93858434 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1648830799; bh=hcIr+aWjGdOri8tRxvTKX1bVvuVc3THsY4nuanpZ2Xw=; h=Subject:To:Date:List-Id:List-Unsubscribe:List-Archive:List-Post: List-Help:List-Subscribe:From:Reply-To:Cc:From; b=Q/1TcW0YglibSU53jQQS3R1PBAenIqVFQ4zjlegFxMLkBLp4c/sz1CW9npawFXsIi Ep7WlOt1RyU6dhqYO7s4rd62oPvxTPRH1wHO338DxzavO4sxxhgyHqoiz7r1xWtNCP D3n4CzNY5M2FgBZj+kZIunbiA2QNsiaRzIGgVIk8= X-Original-To: gcc-patches@gcc.gnu.org Delivered-To: gcc-patches@gcc.gnu.org Received: from mengyan1223.wang (mengyan1223.wang [89.208.246.23]) by sourceware.org (Postfix) with ESMTPS id D4D2A3858D28; Fri, 1 Apr 2022 16:32:37 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D4D2A3858D28 Received: from [IPv6:240e:358:11c6:7500:dc73:854d:832e:3] (unknown [IPv6:240e:358:11c6:7500:dc73:854d:832e:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-384) server-digest SHA384) (Client did not present a certificate) (Authenticated sender: xry111@mengyan1223.wang) by mengyan1223.wang (Postfix) with ESMTPSA id A5AB666272; Fri, 1 Apr 2022 12:32:31 -0400 (EDT) Message-ID: Subject: [wwwdocs PATCH] document zero-width field ABI changes on MIPS To: gcc-patches@gcc.gnu.org Date: Sat, 02 Apr 2022 00:32:19 +0800 User-Agent: Evolution 3.44.0 MIME-Version: 1.0 X-Spam-Status: No, score=-3039.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, JMQ_SPF_NEUTRAL, SPF_HELO_PASS, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Xi Ruoyao via Gcc-patches From: Xi Ruoyao Reply-To: Xi Ruoyao Cc: Richard Sandiford , Jakub Jelinek , YunQiang Su Errors-To: gcc-patches-bounces+patchwork=sourceware.org@gcc.gnu.org Sender: "Gcc-patches" Document PR102024 change (r12-7961 and 7962) for MIPS. Ok for wwwdocs? --- htdocs/gcc-12/changes.html | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html index 4e1f6b0f..a2d8156f 100644 --- a/htdocs/gcc-12/changes.html +++ b/htdocs/gcc-12/changes.html @@ -50,6 +50,10 @@ a work-in-progress.

(so there is a C++ ABI incompatibility, GCC 4.4 and earlier compatible with GCC 12 or later, incompatible with GCC 4.5 through GCC 11). RISC-V has changed the handling of these already starting with GCC 10. + As the ABI requires, MIPS takes them into account handling function + return values so there is a C++ ABI incompatibility with GCC 4.5 + through 11. For function arguments on MIPS, refer to + the MIPS specific entry. GCC 12 on the above targets will report such incompatibilities as warnings or other diagnostics unless -Wno-psabi is used. @@ -549,7 +553,18 @@ a work-in-progress.

- +

MIPS

+
    +
  • The ABI passing arguments + containing zero-width fields (for example, C/C++ zero-width + bit-fields, GNU C/C++ zero-length arrays, and GNU C empty structs) + has changed. Now a zero-width field will not prevent an aligned + 64-bit floating-point field next to it from being passed through + FPR. This is compatible with LLVM, but incompatible with previous + GCC releases. GCC 12 on MIPS will report such incompatibilities as + an inform unless -Wno-psabi is used. +
    • +