Fork#41597: std::remquo does not yield the proper result for the quotient
Open Date: 2021-02-18 06:25
Last Update: 2021-02-18 10:25
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/41597
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Last Changes/Comment on this Ticket:
2021-02-18 10:25 Updated by: apodtele
Comment:
Ok. You should upgrade to GCC-9.2.0 and see if it is already fixed.
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Ticket Status:
Reporter: avhaecke
Owner: (None)
Type: Issues
Status: Open
Priority: 5 - Medium
MileStone: (None)
Component: GCC
Severity: 5 - Medium
Resolution: None
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Ticket details:
Context :
This problem was encountered with gcc on MinGW in the following version :
gcc.exe (MinGW.org GCC-6.3.0-1) 6.3.0
Description :
The following code :
double numer = 90.1 ;
double denom = 90 .0 ;
int quot ;
double result = std::remquo(numer, denom, ") ;
std::cout << "result " << result << std::endl ;
std::cout << "quot " << quot << std::endl;
should yield :
result 0.1
quot 1
As is expected from std::remquo, quot has a magnitude which should be congruent (modulo 2 to the nth) to the magnitude of the integral quotient of x/y, n being greater or equal than 3.
However with gcc 6.3.0, on MinGW, the above instructions yield :
result 0.1
quot 0
On another version of gcc (gcc 4.9.1 2014), the expected behavior is encountered.
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