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Re: Feature, or bug? [message #80231]

Mon, 21 May 2012 10:13

Lajos Foldy
Messages: 176
Registered: December 2011

Senior Member

> Hmmmm... Well check_math _does_ claim that it will report integer
> overflow, in bit 1.
>
> But I wouldn't be using check_math to check for that condition in the
> construct I was using anyway, so it's moot that check_math apparently
> falls down on the job, at least in this case.
>
> Thanks for the explanation.
>
> whd
>
>>
>> regards,
>> Lajos

The check_math help says: "Some hardware/operating system combinations may not report all of the math errors listed." Integer overflow is listed, but not checked and reported :-)

Integer overflow is "undefined behaviour" in standard C, so it can not be done in a portable way. The glibc manual says:

FPE_INTOVF_TRAP

Integer overflow (impossible in a C program unless you enable overflow trapping in a hardware-specific fashion).

regards,
Lajos

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[Message index]

		Re: Feature, or bug? By: Lajos Foldy on Mon, 21 May 2012 10:13
		Re: Feature, or bug? By: whdaffer on Mon, 21 May 2012 09:31
		Re: Feature, or bug? By: Lajos Foldy on Sun, 20 May 2012 05:08
		Re: Feature, or bug? By: whdaffer on Wed, 23 May 2012 12:32

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