IV72747: AUTO INT TO DOUBLE CONVERT LOADING INCORRECT VALUE

XL C/C++ for AIX Fix Pack 3 (April 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 4 (July 2015 PTF) for 13.1
XL C for AIX Fix Pack 5 (November 2015 Update) for 13.1
XL C/C++ for AIX Fix Pack 5 (November 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 6 (February 2016 PTF) for 13.1
XL C for AIX Fix Pack 6 (February 2016 Update) for 13.1
XL C for AIX Fix Pack 7 (May 2016 Update) for 13.1
XL C/C++ for AIX Fix Pack 7 (May 2016 PTF) for 13.1
XL C for AIX Fix Pack 8 (August 2016 Update) for 13.1
XL C/C++ for AIX Fix Pack 8 (August 2016 PTF) for 13.1
XL C for AIX Fix Pack 9 (June 2017 Update) for 13.1
XL C/C++ for AIX Fix Pack 9 (June 2017 PTF) for 13.1
XL C for AIX Fix Pack 10 (February 2018 Update) for 13.1
XL C/C++ for AIX Fix Pack 10 (February 2018 PTF) for 13.1
XL C for AIX Fix Pack 3 (April 2015 PTF) for 13.1
XL C for AIX Fix Pack 4 (July 2015 PTF) for 13.1
XL C/C++ for AIX Fix Pack 11 (November 2018 PTF) for 13.1
XL C for AIX Fix Pack 11 (November 2018) for 13.1

APAR status

• Closed as program error.

Error description

• When using optimization, an internal integer to float double
  conversion is causing values to be stored at one memory
  location, but loaded from another location in memory.
  
  For example, in the following listing output, integer 'test' is
  stored on the stack via gr1, but loaded later in the program
  using an offset of gr31:
  
  
  0| 00F608 std F88100B0 1 ST8 test(gr1,176)=gr4
  ...
  0| 0274CC lwa E89F80F2 1 L4A gr4=test(gr31,-32528)
  

Local fix

• Use a lower optimization level.
  

Problem summary

• USERS AFFECTED:
  Users that have automatic variables/parameters in their code
  may be affected by this issue.
  
  PROBLEM DESCRIPTION:
  At macro expansion time tje compiler has to know what automatic
  variables/parameters are accessible directly from the stack
  pointer and which ones may be too far away.
  There is a fairly small number of temps that might be used by
  macro expansion. The compiler was not taking those into
  account.
  

Problem conclusion

• The compiler has been fixed to take into account the small
  number of temps that get generated.
  

Temporary fix

Comments

APAR Information

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

  IV68434

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

Fix information

• Fixed component name

  XL C FOR AIX

• Fixed component ID

  5725C7100

Applicable component levels

• RD10 PSY