[MinGW-Notify] [mingw] #41597: std::remquo does not yield the proper result for the quotient

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Sat Mar 20 19:07:02 JST 2021


#41597: std::remquo does not yield the proper result for the quotient

  Open Date: 2021-02-17 21:25
Last Update: 2021-03-20 10:07

URL for this Ticket:
    https://osdn.net//projects/mingw/ticket/41597
RSS feed for this Ticket:
    https://osdn.net/ticket/ticket_rss.php?group_id=3917&tid=41597

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Last Changes/Comment on this Ticket:
2021-03-20 10:07 Updated by: keith
 * Status Update from Open to Closed
 * Resolution Update from None to Fixed

Comment:

I committed #38a2db6, (and related #b3f510a), to resolve this issue.  These changes will be included in the next mingwrt release.

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Ticket Status:

      Reporter: avhaecke
         Owner: keith
          Type: Issues
        Status: Closed
      Priority: 5 - Medium
     MileStone: (None)
     Component: WSL
      Severity: 5 - Medium
    Resolution: Fixed
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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, &quot) ; 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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URL for this Ticket:
    https://osdn.net/projects/mingw/ticket/41597
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