Date: Thu, 1 Dec 2011 00:48:43 +0000 From: Igor Mozolevsky <mozolevsky@gmail.com> To: Adrian Chadd <adrian@freebsd.org> Cc: Alexander Best <arundel@freebsd.org>, freebsd-wireless@freebsd.org Subject: Re: comparing floating points via "==" or "!=" Message-ID: <CADWvR2hAohYysntaK_UJcwU10%2Bvy4pDrpSnj-DU%2BKphZLW6Tdw@mail.gmail.com> In-Reply-To: <CAJ-Vmon4Fn4RAMhHS6skpsy2Lst3XUYXsENSCr0SCQFjQH6c6w@mail.gmail.com> References: <20111130224422.GA36424@freebsd.org> <CADWvR2herXkcMaZXFKm_ALBXnVFDhRCNZ-9%2B-MwHVx5XJPG4AA@mail.gmail.com> <20111201000243.GB44877@freebsd.org> <CADWvR2irEU0ANHNG4mvC1voVP6Y3YMTQxs5d35o5SbBTJ8JyfQ@mail.gmail.com> <20111201001158.GA48051@freebsd.org> <CADWvR2iUB4mDFuwbWzqe6bnjShTZEQzQ-ubAx8h7yqGwjcUHKA@mail.gmail.com> <20111201003938.GA52503@freebsd.org> <CAJ-Vmon4Fn4RAMhHS6skpsy2Lst3XUYXsENSCr0SCQFjQH6c6w@mail.gmail.com>
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On 1 December 2011 00:43, Adrian Chadd <adrian@freebsd.org> wrote: > Erm, these aren't run-time comparisons though, these are done at compile time. Aren't they macro expansions: % gcc -E - #define NA1(_r) \ 59 (((_r) == 6.5) ? 8 : (((_r) == 13) ? 9 : (((_r) == 19.5)? 10 : \ 60 (((_r) == 26) ? 11 : (((_r) == 39) ? 12 : (((_r) == 52) ? 13 : \ 61 (((_r) == 58.5)? 14 : (((_r) == 65) ? 15 : 0)))))))) NA1(7) # 1 "<stdin>" # 1 "<built-in>" # 1 "<command-line>" # 1 "<stdin>" 59 (((7) == 6.5) ? 8 : (((7) == 13) ? 9 : (((7) == 19.5)? 10 : 60 (((7) == 26) ? 11 : (((7) == 39) ? 12 : (((7) == 52) ? 13 : 61 (((7) == 58.5)? 14 : (((7) == 65) ? 15 : 0)))))))) Cheers, -- Igor M :-)
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