Richard Henderson - Re: [RFC] PR/24900: computed but not used cast values (original) (raw)

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• From: Richard Henderson
• To: Joe Buck
• Cc: Ian Lance Taylor , Aldy Hernandez , gcc at gcc dot gnu dot org, joseph at codesourcery dot com
• Date: Thu, 17 Nov 2005 15🔞42 -0800
• Subject: Re: [RFC] PR/24900: computed but not used cast values
• References: <20051117213300.GA15008@redhat.com> <m3br0j0w8b.fsf@gossamer.airs.com> <20051117225448.GA21279@redhat.com> <20051117230042.GP15434@synopsys.com>

On Thu, Nov 17, 2005 at 03:00:42PM -0800, Joe Buck wrote:

As in the example, these cases will usually arise in macros, where under some circumstances some computation will be wasted.

Which is no different from f()+1, for which no one is arguing that the warning we give is incorrect. If you've got such cases, you simply should be asking for this warning, IMO.

r~

• References:
  • [RFC] PR/24900: computed but not used cast values
    * From: Aldy Hernandez
  • Re: [RFC] PR/24900: computed but not used cast values
    * From: Ian Lance Taylor
  • Re: [RFC] PR/24900: computed but not used cast values
    * From: Richard Henderson
  • Re: [RFC] PR/24900: computed but not used cast values
    * From: Joe Buck