PH61160: METAL C NESTED 'IF' STATEMENTS FOR PTR64 CAUSE BAD CODE GEN

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When compiling a Metal C file with nested if statements:
  
  >cat a.c
  int free64(void * __ptr64 a) __attribute__((amode64));
  int test (void * __ptr64 p) {
   if ( p ) {
     if ( p ) {
       free64(p);
     }
   }
   return 0;
  }
  >xlc a.c -qmetal -S -O3 -o fail.s
  >
  
  The assembly code generated for this __ptr64 example above is
  not correct. The assembly code contains LCR and O 32-bit
  statements:
     40  *   if ( p ) {
                 000003
     41           USING @@PARMD@1,1
                 000003
     42           LG    14,@2p
                 000003
     43           LCR   15,14
                 000003
     44           O     15,@2p+4
                 000003
     45  *     if ( p ) {
                 000004
  
  The assembly code for __ptr64 needs to generate LCGR and OG
  64-bit statements.
  

Local fix

• Compile at NOOPT or disable HGPR.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED: Users of V2R4 XL C/C++ at OPT(2)             *
  *                 or above, with ILP32, HGPR, and XPLINK or    *
  *                 METAL                                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: The compiler may generate               *
  *                      code which is incorrect for a           *
  *                      comparison of an 8                      *
  *                      byte data to 0.                         *
  ****************************************************************
  * RECOMMENDATION: Install the PTF                              *
  ****************************************************************
  N/A
  

Problem conclusion

• Install the PTF or use workaround
  

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:

  UI98701

Modules/Macros

• CCNECICS CCNECWI  CCNED240 CCNEDSCT CCNEDWRT CCNEFILT CCNEHIFC
  CCNEIPA3 CCNEIPAO CCNEMDEP CCNEOPTP CCNEP    CCNEPP   CCNETBY
  CCNMSGE  CCNMSGT  CCNQIPA
  

Fix information

• Fixed component name

  C/C++ FOR MVS

• Fixed component ID

  56551210A

Applicable component levels

• R7C0 PSY UI98701

     UP24/10/30 P F410

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.