digitalmars.D.bugs - [Issue 7548] New: Less specific lowering of power operator was chosen, causing 10.0L^^2 == 99.999999999999999993L
- d-bugmail puremagic.com (32/32) Feb 19 2012 http://d.puremagic.com/issues/show_bug.cgi?id=7548
- d-bugmail puremagic.com (11/11) Oct 02 2013 http://d.puremagic.com/issues/show_bug.cgi?id=7548
- d-bugmail puremagic.com (12/12) Oct 03 2013 http://d.puremagic.com/issues/show_bug.cgi?id=7548
http://d.puremagic.com/issues/show_bug.cgi?id=7548 Summary: Less specific lowering of power operator was chosen, causing 10.0L^^2 == 99.999999999999999993L Product: D Version: D2 Platform: All OS/Version: All Status: NEW Severity: minor Priority: P2 Component: DMD AssignedTo: nobody puremagic.com ReportedBy: kennytm gmail.com Test case: ----------------------------------- import std.math; void main() { int e = 2; real r = 10.0L; assert(pow(r, e) == 100.0L); // passes assert(r^^e == 100.0L); // fails on 64-bit. } ----------------------------------- The problem was 'r^^e' is using the version of 'std.math.pow' with a real exponent, although the version with integral exponent should be chosen, which allows a better precision. The front end should avoid casting 'e2' in a PowExp to 'real' too early. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Feb 19 2012
http://d.puremagic.com/issues/show_bug.cgi?id=7548 safety0ff.bugz gmail.com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |safety0ff.bugz gmail.com Patch in issue 11159 fixes this, r^^e was using CTFE. One issue should be marked duplicate of the other. -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Oct 02 2013
http://d.puremagic.com/issues/show_bug.cgi?id=7548 Walter Bright <bugzilla digitalmars.com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED CC| |bugzilla digitalmars.com Resolution| |DUPLICATE 22:57:15 PDT --- *** This issue has been marked as a duplicate of issue 11159 *** -- Configure issuemail: http://d.puremagic.com/issues/userprefs.cgi?tab=email ------- You are receiving this mail because: -------
Oct 03 2013