[llvm-bugs] [Bug 24599] New: clang++ cannot cast double to unsigned correctly.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=24599

            Bug ID: 24599
           Summary: clang++ cannot cast double to unsigned correctly.
           Product: clang
           Version: 3.5
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: jtony at ca.ibm.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Clang cast double to unsigned wrongly, while g++ can cast it correctly. 

-------------------------------------------------------------------------
-bash-4.2$ cat test.C
#include <iostream>
using namespace std;

int main(){
   double d1 = 10.0L;
   cout << "d1:"<<d1<<" unsigned:"<< static_cast<unsigned>(d1) << endl;
}
-------------------------------------------------------------------------


g++ test result:
-------------------------------------------------------------------------
-bash-4.2$ g++ test.C
-bash-4.2$ ./a.out
d1:10 unsigned:10
-------------------------------------------------------------------------



clang++ test result:
-------------------------------------------------------------------------
-bash-4.2$ clang++ test.C
-bash-4.2$ ./a.out
d1:10 unsigned:0
-------------------------------------------------------------------------


The above test is done on Red Hat Enterprise Linux Server release 7.1 Beta
(Maipo). This problem exists in both clang++ 3.5 and clang++ 3.6.

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