Re: [testsuite, i386] Reimplementing array comparison in avx2-vpop-check.h

[Alexander Ivchenko <aivchenk@gmail.com>]

Yep, that also works.

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 64ffe8f..7efc3f1 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2013-04-18  Grigoriy Kraynov  <grigoriy.kraynov@intel.com>
+
+       * gcc.target/i386/avx2-vpop-check.h: volatility is casted away in
+       memcmp().
+
 2013-04-18  Jakub Jelinek  <jakub@redhat.com>

        PR tree-optimization/56984
diff --git a/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
b/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
index 143b54da..02c879e 100644
--- a/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
+++ b/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
@@ -47,7 +47,7 @@ avx2_test (void)
       gen_pop ();
       check_pop ();

-      if (memcmp (c, c_ref, SIZE * sizeof (TYPE)))
+      if (memcmp (c, (void *) c_ref, SIZE * sizeof (TYPE)))
        abort();
     }
 }


The fix is pretty obvious, but still.. is it OK for trunk?

thanks,
Alexander


2013/4/11 Richard Biener <richard.guenther@gmail.com>:
> On Thu, Apr 11, 2013 at 1:58 PM, Alexander Ivchenko <aivchenk@gmail.com> wrote:
>> Hi,
>>
>> Usually <stdlib.h> does not include <string.h> but on bionic it is
>> historically included. memcmp() reacts on a volatile argument
>> differently, depending on whether <string.h> is included or not. If it
>> is included, then the compiler will generate a warning:
>> warning: passing argument 2 of 'memcmp' discards 'volatile' qualifier
>> from pointer target type [enabled by default]
>>
>> In avx2-vpop-check.h we compare two arrays using memcmp(), and since
>> one of them is declared as volatile we have test-fails because of that
>> warning. The following patch reimplements the comparison using just
>> for-loop:
>>
>> diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
>> index 943be90..9b08eb0 100644
>> --- a/gcc/testsuite/ChangeLog
>> +++ b/gcc/testsuite/ChangeLog
>> @@ -1,3 +1,7 @@
>> +2013-04-11  Grigoriy Kraynov  <grigoriy.kraynov@intel.com>
>> +
>> +       * gcc.target/i386/avx2-vpop-check.h: memcmp() replaced by for loop.
>> +
>>  2013-04-11  Paolo Carlini  <paolo.carlini@oracle.com>
>>
>>         PR c++/54216
>> diff --git a/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
>> b/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
>> index 143b54da..921ed0b 100644
>> --- a/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
>> +++ b/gcc/testsuite/gcc.target/i386/avx2-vpop-check.h
>> @@ -47,7 +47,8 @@ avx2_test (void)
>>        gen_pop ();
>>        check_pop ();
>>
>> -      if (memcmp (c, c_ref, SIZE * sizeof (TYPE)))
>> -       abort();
>> +      for (i = 0; i < SIZE; ++i)
>> +        if (c[i] != c_ref[i])
>> +          abort();
>>      }
>>  }
>>
>>
>> is it OK?
>
> Just cast away the volatileness?  memcmp (c, (void *)c_ref, ...)?
>
> Richard.
>
>> thanks,
>> Alexander