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Message #26482
Re: [PATCH] Remove check for undefined behaviour
Thanks Simon. Chris already tested this. I just haven't got around to
merging the patch. One positive thing about leaving this code in place
is it should raise a red flag to anyone who looks at it. Removing this
code is going to hide the true ugliness that lies underneath it.
Wayne
On 9/28/2016 6:44 PM, Simon Richter wrote:
> Hi,
>
> On 28.09.2016 17:57, Wayne Stambaugh wrote:
>
>> I didn't test what the compiler generated but I suspected that was the
>> case from warning message. If that's the case then I will apply the
>> patch but it does mask the underlying issue which could fail spectacularly.
>
> That is what happens:
>
> #include <exception>
>
> void foo(int &i)
> {
> if(&i == 0)
> std::terminate();
> }
>
> $ g++ -O2 -c tt.cpp
>
> 0000000000000000 <foo(int&)>:
> 0: f3 c3 repz retq
>
> So the test is indeed optimized out.
>
> Simon
>
>
>
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