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From: Falk Hueffner <falk.hueffner@student.uni-tuebingen.de> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, Subject: Re: c/10226: unsigned short promotion with bitwise inversion Date: Wed, 26 Mar 2003 18:26:00 -0000 [thread overview] Message-ID: <20030326182601.21546.qmail@sources.redhat.com> (raw) The following reply was made to PR c/10226; it has been noted by GNATS. From: Falk Hueffner <falk.hueffner@student.uni-tuebingen.de> To: mmarks@internetmachines.com Cc: gcc-gnats@gcc.gnu.org Subject: Re: c/10226: unsigned short promotion with bitwise inversion Date: 26 Mar 2003 19:23:10 +0100 mmarks@internetmachines.com writes: > When two unsigned shorts (16 bit) variables are compared with one being inverted the comparison will fail. > The following code should pass, while it does generate a warning it > should instead just work. > > unsigned short A = 0xDEAD; > unsigned short B; > B = ~A; > if ( B == ~A) { > printf("Pass\n"); > } > else { > printf("Fail\n"); > } Apparently, you didn't understand the warning. The C standard mandates that "~A" will promote A to int first. So gcc is behaving correctly here. Any suggestions on how the wording of the message could be improved to be clearer? -- Falk
next reply other threads:[~2003-03-26 18:26 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-03-26 18:26 Falk Hueffner [this message] -- strict thread matches above, loose matches on Subject: below -- 2003-03-27 0:16 Michael Marks 2003-03-26 23:06 Falk Hueffner 2003-03-26 22:36 Glen Nakamura 2003-03-26 22:26 Glen Nakamura 2003-03-26 22:26 Falk Hueffner 2003-03-26 22:06 Michael Marks 2003-03-26 21:56 Falk Hueffner 2003-03-26 21:56 Glen Nakamura 2003-03-26 21:16 ebotcazou 2003-03-26 21:16 Michael Marks 2003-03-26 20:36 Glen Nakamura 2003-03-26 19:56 Michael Marks 2003-03-26 18:16 mmarks
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