Fixes are available
November 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
March 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
July 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
December 2011 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
March 2012 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
January 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
May 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
August 2010 PTF for XL C/C++ Enterprise Edition for AIX, V9.0
APAR status
Closed as program error.
Error description
The provided test case produces an incorrect output at runtime due to the incorrect evaluation of !((~max_juint) == 0) within the 'if' statement. ===== COMPILE COMMAND: xlC_r -q64 test.cpp ===== TESTCASE: $ cat test.cpp /********************************/ #include <stdio.h> typedef uint32_t juint; const juint max_juint = (juint)-1; /* 0xFFFFFFFF largest juint */ int main() { printf("max_juint: 0x%x\n", max_juint); printf("~max_juint: 0x%x\n", ~max_juint); printf(" ((~max_juint) == 0) : %d\n", ((~max_juint) == 0)); printf("!((~max_juint) == 0) : %d\n", !((~max_juint) == 0)); if (!((~max_juint) == 0)) { printf("*** error ***\n", max_juint); } else { printf("*** ok ***\n", max_juint); } return 0; } ===== ACTUAL OUTPUT: $ ./a.out max_juint: 0xffffffff ~max_juint: 0x0 ((~max_juint) == 0) : 1 !((~max_juint) == 0) : 0 *** error *** $ ===== EXPECTED OUTPUT: $ ./a.out max_juint: 0xffffffff ~max_juint: 0x0 ((~max_juint) == 0) : 1 !((~max_juint) == 0) : 0 *** ok *** $
Local fix
Assign the value to a temp variable before evaluating the expression within the 'if'. eg: . . uint32_t temp = ~max_juint; if (!(temp == 0)) { printf("*** error ***\n", max_juint); } else { printf("*** ok ***\n", max_juint); } . .
Problem summary
USER AFFECTED: Users using special const iteral type like HEX, in the logical comparison statement. PROBLEM DESCRIPTION: The compiler does not evaluate the non-integral literal type properly, causing the logic relation in the if-else statements is determined incorrectly.
Problem conclusion
xlCentry needs to choose proper routines to convert and evaluate the special const literal type.
Temporary fix
Comments
APAR Information
APAR number
IZ67264
Reported component name
XLC C++ AIX
Reported component ID
5724S7100
Reported release
900
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2009-12-21
Closed date
2009-12-21
Last modified date
2010-01-05
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
XLC C++ AIX
Fixed component ID
5724S7100
Applicable component levels
[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSJT9L","label":"XL C\/C++"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.0","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]
Document Information
Modified date:
16 October 2021