IY69527: IPA generates bad while loop in 64-bit mode

Fixes are available

APAR status

Closed as program error.

Error description

The testcase calls a function which contains a while loop.
The exit condition for the loop is when the two  variables
are not-equal.   It should exit after the first iteration
of the loop since the variable should be equal, and this is what
occurs normally.   However, with -qipa and -q64 the program goes
into an infinite loop.

Compile commands:
xlC -q64 -c main.c
xlC -q64 -c func.c -qipa
xlC -q64 main.o func.o

#### func.c ###########
void mytest(void)
{
  unsigned int var1=2;
  int var2=1;

  if (var2 != var1)
    do
    {
      var1--;
      printf("@");
    }
    while (var1 != var2);
}
#### end of func.c ####


#### main.c ###########
int main()
{
    mytest();
}
#### end of main.c  ###

Local fix

Make var1 an 'int' rather than 'unsigned int'
If either -qipa or -q64 is not included the output is correct.

Problem summary

```
 Same as sumbitters
```

Problem conclusion

```
 fixed
```

Temporary fix

Comments

APAR Information

APAR number
IY69527
Reported component name
XLC AIX
Reported component ID
5724I1000
Reported release
700
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2005-03-24
Closed date
2005-04-06
Last modified date
2007-08-02

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

LI70891 LI71004

Fix information

Fixed component name
XLC AIX
Fixed component ID
5724I1000

Applicable component levels

R700 PSN U812645
UP07/08/02 I 1000

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.

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Document Information

Modified date:
20 August 2024

Tips

IY69527: IPA generates bad while loop in 64-bit mode

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R700 PSN U812645

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.

Document Information

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