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re PR c++/13387 (assignment to base class corrupts subclass)

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PR c++/13387
	* g++.dg/opt/alias3.C: New test.

Co-Authored-By: Richard Sandiford <rsandifo@redhat.com>

From-SVN: r75427
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Nathan Sidwell 2004-01-05 10:15:07 +00:00 committed by Nathan Sidwell
parent b56c00235a
commit fa1704829d
2 changed files with 51 additions and 0 deletions
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6
gcc/testsuite/ChangeLog
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2004-01-05 Nathan Sidwell <nathan@codesourcery.com>
Richard Sandiford <rsandifo@redhat.com>
PR c++/13387
* g++.dg/opt/alias3.C: New test.
2004-01-04 Mark Mitchell <mark@codesourcery.com>
PR c++/13157

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gcc/testsuite/g++.dg/opt/alias3.C Normal file
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// { dg-options "-O2" }
// Contributed by Nathan Sidwell 22 Dec 2003 <nathan@codesourcery.com>
// Origin: rsandifo@redhat.com
// PR c++/13387. Alias sets were incorrect
struct C {
C(short *p = 0, int i = 0) : ptr (p), index (i) {}
short operator*() { return ptr[index]; }
short *ptr;
int index;
};
C f1 (C) __attribute__ ((noinline));
C f1 (C x)
{
return x;
}
void f2 (short)__attribute__ ((noinline));;
short s;
void f2 (short s_)
{
s = s_;
}
C g (C x)__attribute__ ((noinline));
C g (C x)
{
x = f1 (x);
f2 (*x);
return x;
}
int main ()
{
short p[2] = { 0x1234, 0x5678 };
C x (p, 1);
g (x);
return s != p[1];
}