LI77889: __BUILTIN_FLOOR() TO ACCEPT AN INTEGER PARAMETER

XL C/C++ for Blue Gene/Q Fix Pack 12 (May 2015 Update) for 12.1
XL C/C++ for Blue Gene/Q Fix Pack 14 (May 2016 Update) for 12.1
XL C/C++ for Blue Gene/Q Fix Pack 15 (October 2017 Update) for 12.1
XL C/C++ for Blue Gene/Q Fix Pack 8 (May 2014 Update) for 12.1
XL C/C++ for Blue Gene/Q Fix Pack 9 (August 2014 Update) for 12.1
XL C/C++ for Blue Gene/Q Fix Pack 10 (November 2014 Update) for 12.1
XL C/C++ for Blue Gene/Q Fix Pack 11 (February 2015 Update) for 12.1
XL C/C++ for Blue Gene/Q Fix Pack 13 (August 2015 Update) for 12.1

APAR status

• Closed as program error.

Error description

• Currently, when you specifiy an integer value to the floor()
  function, the compiler issues an error message as follows:
  
  ===== COMPILE COMMAND:
  bgxlC -c test.cpp
  
  ===== TESTCASE:
  $ cat test.cpp
  #include <stdio.h>
  #include <stdlib.h>
  #include <iostream>
  
  #include <cmath>
  using std::floor;
  
  
  
  int  main(int argc, char *argv[])
  {
     double d1, d2, d3;
     int i1, i2, i3;
     unsigned long ul1, ul2, ul3;
  
     d1 = 1.1; d2 = 2.9;
     i1=13; i2=5;
     ul1=737; ul2=47;
  
     //i3 = floor( d2 );
  
     i3 = floor( i1 );
  
     //i3 = floor( i1 / i2 );
  
     //if ( floor( i3/i2 ) != floor( i2/i1 ) )
    //    d3=d2/d1;
  
     ul3 = floor( ul1 );
  
     //ul3 = floor( ul1 / ul2 );
     //if ( floor( ul3/ul2 ) != floor( ul2/ul1 ) )
       // d1 = d3 * d2;
  
     return 0;
  
  }
  $
  
  ===== ACTUAL OUTPUT:
  $ bgxlC test2.cpp -c
  "/bgsys/drivers/ppcfloor/gnu-linux/lib/gcc/powerpc64-bgq-linux/4
  .4.7/../../../../powerpc64-bgq-linux/include/c++/4.4.7/cmath",
  line 269.14: 1540-0274 (S) The name lookup for "__builtin_floor"
  did not find a declaration.
  "/bgsys/drivers/ppcfloor/gnu-linux/lib/gcc/powerpc64-bgq-linux/4
  .4.7/../../../../powerpc64-bgq-linux/include/c++/4.4.7/cmath",
  line 268.5: 1540-0700 (I) The previous message was produced
  while processing "std::floor<int>(int)".
  "test.cpp", line 22.9: 1540-0700 (I) The previous message was
  produced while processing "main(int, char *[])".
  "/bgsys/drivers/ppcfloor/gnu-linux/lib/gcc/powerpc64-bgq-linux/4
  .4.7/../../../../powerpc64-bgq-linux/include/c++/4.4.7/cmath",
  line 269.14: 1540-0274 (S) The name lookup for "__builtin_floor"
  did not find a declaration.
  "/bgsys/drivers/ppcfloor/gnu-linux/lib/gcc/powerpc64-bgq-linux/4
  .4.7/../../../../powerpc64-bgq-linux/include/c++/4.4.7/cmath",
  line 268.5: 1540-0700 (I) The previous message was produced
  while processing "std::floor<unsigned long>(unsigned long)".
  "test.cpp", line 29.10: 1540-0700 (I) The previous message was
  produced while processing "main(int, char *[])".
  $
  
  ===== EXPECTED OUTPUT:
  Clean compile
  

Local fix

• Cast the integer into a floating/double value.
  

Problem summary

• USERS AFFECTED:
  Users who wish to pass in an integer parameter to floor() are
  affected by this issue.
  
  PROBLEM DESCRIPTION:
  The floor() function calls the internal  __builtin_floor()
  which was not taking int as a parameter.
  

Problem conclusion

• The internal __builtin_floor() function now has a forward
  declaration which accepts integers.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  IV62684

Fix information

• Fixed component name

  XL C/C++ FOR BG

• Fixed component ID

  5799AG100

Applicable component levels