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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692405185; bh=+9TMKciaReS23IR9bUxPYz6n0wY3XsTXpnj5G81lttM=; h=From:To:Cc:Subject:Date:From; b=QtQEO1G1yqIlSwHY7W5g4OG+lfOhExzLIuarEu0t+RzziQwPuoRN0yOd+uJF8/uqp NaNDyrdKmdIsVPP0Sn2fQ4FSa86+OyotNkluyK7SdrCUZBhj3/Y7q0jm+MUX0xp3+Y CUscC7lvGddx3jiQgIDGOjz2n+a90uUIgCglc85uiNo1/yvyfsKS6BcfmlT51FRCfS WCcwkXt2XDo0I7UWiYe2pCENdU4BOurCCLsGrS904a6vCkfGOWlyS0ThquenQLpq27 axXfdBPScJPaDKBRH9KDBeEu5l9inUFx9YuEzZYW304TXLjaPi+/Uiv6ABjRnAyu6S EmUVhxUkENTuw== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, jbeulich@suse.com, andrew.cooper3@citrix.com, roger.pau@citrix.com, julien@xen.org, bertrand.marquis@arm.com, Stefano Stabellini Subject: [PATCH] docs/misra: document gcc-specific behavior with shifting signed integers Date: Fri, 18 Aug 2023 17:33:03 -0700 Message-Id: <20230819003303.1744466-1-sstabellini@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @kernel.org) X-ZM-MESSAGEID: 1692405213923100001 Content-Type: text/plain; charset="utf-8" From: Stefano Stabellini Signed-off-by: Stefano Stabellini --- Changes in v2: - use "shift" instead of << or >> - use All Architectures (I haven't changed all the other instances of x86/arm in the file yet) --- docs/misra/C-language-toolchain.rst | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/docs/misra/C-language-toolchain.rst b/docs/misra/C-language-to= olchain.rst index 785aed1eaf..f5ca7bd2c8 100644 --- a/docs/misra/C-language-toolchain.rst +++ b/docs/misra/C-language-toolchain.rst @@ -200,6 +200,12 @@ The table columns are as follows: - ARM64, X86_64 - See Section "6.29 Designated Initializers" of GCC_MANUAL =20 + * - Signed shift acts on negative numbers by sign extension + - All architectures + - See Section "4.5 Integers" of GCC_MANUAL. As an extension to the + C language, GCC does not use the latitude given in C99 and C11 + only to treat certain aspects of signed shift as undefined. + =20 Translation Limits __________________ --=20 2.25.1