I tried to do this but in empty project it works correctly. I converted the
float to int32_t like this:
int32_t* val = (int32_t) &res;
printf("%d\n", *val);
and the number was 2143289344, I created testcase:
#include <cmath>
#include <cstdio>
int main(int argc, char** argv) {
int32_t nan = 2143289344;
float* val = (float *) &nan;
printf("val '%.2f', isnan:%s, isinf:%s\n", *val,
std::isnan(*val) ? "yes" : "no",
std::isinf(*val) ? "yes" : "no");
return 0;
}
but it works correctly:
val 'nan', isnan: yes, isinf: no
Moreover in native build of project there is no NAN in problem place, it
appears only in emscripten build. So, probably error happens somewhere
else... Trying to understand.
ср, 2 мар. 2022 г. в 00:18, 'Sam Clegg' via emscripten-discuss <
[email protected]>:
> Perhaps if you print the actual bitpattern at the point of failure you can
> use that to create a repro case? Without a repro case I think this will
> be hard to make progress on. Once you have a repro please open an bug
> report on github.
>
> chers,
> sam
>
>
> On Tue, Mar 1, 2022 at 8:38 AM Александр Гурьянов <[email protected]>
> wrote:
>
>> Hi, I faced problem that std::isnan return false for NAN. I added this
>> debug printf to my project:
>>
>> printf("res %.2f %s %s\n", res,
>> std::isnan(res) ? "isnan" : "notnan",
>> std::isinf(res) ? "isinf" : "notinf");
>>
>> and when res is NAN, output is following:
>>
>> res nan notnan notinf
>>
>> I tried to make a simple test case, but in test case it works fine. So, I
>> think this is a sort of UB, but I run project with valgrind - no errors. I
>> tried -s ASSERTIONS=1 -s SAFE_HEAP=2, also no errors.
>>
>> Any suggestions what it can be?
>>
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