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builtins.c (get_memory_rtx): Always put into alias set 0.

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* builtins.c (get_memory_rtx): Always put into alias set 0.

	* gcc.c-torture/execute/20000703-1.c: New test.

From-SVN: r34849
This commit is contained in:
Jakub Jelinek 2000-07-03 20:28:34 +02:00 committed by Jakub Jelinek
parent 9dc79c6f47
commit f46ad0764a
4 changed files with 50 additions and 0 deletions
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4
gcc/ChangeLog
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@ -1,3 +1,7 @@
2000-07-03 Jakub Jelinek <jakub@redhat.com>
* builtins.c (get_memory_rtx): Always put into alias set 0.
2000-07-03 Nick Clifton <nickc@cygnus.com>
* config/arm/arm.md: Fix post increment and pre increment

3
gcc/builtins.c
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@ -558,6 +558,9 @@ get_memory_rtx (exp)
return mem;
set_mem_attributes (mem, exp, 0);
/* memcpy, memset and other builtin stringops can alias with anything. */
MEM_ALIAS_SET (mem) = 0;
return mem;
}

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2000-07-03 Jakub Jelinek <jakub@redhat.com>
* gcc.c-torture/execute/20000703-1.c: New test.
2000-07-03 Nathan Sidwell <nathan@codesourcery.com>
* g++.old-deja/g++.pt (lookup10.C): New test.

39
gcc/testsuite/gcc.c-torture/execute/20000703-1.c Normal file
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@ -0,0 +1,39 @@
void abort(void);
void exit(int);
struct baz
{
char a[17];
char b[3];
unsigned int c;
unsigned int d;
};
void foo(struct baz *p, unsigned int c, unsigned int d)
{
__builtin_memcpy (p->b, "abc", 3);
p->c = c;
p->d = d;
}
void bar(struct baz *p, unsigned int c, unsigned int d)
{
({ void *s = (p);
__builtin_memset (s, '\0', sizeof (struct baz));
s; });
__builtin_memcpy (p->a, "01234567890123456", 17);
__builtin_memcpy (p->b, "abc", 3);
p->c = c;
p->d = d;
}
int main()
{
struct baz p;
foo(&p, 71, 18);
if (p.c != 71 || p.d != 18)
abort();
bar(&p, 59, 26);
if (p.c != 59 || p.d != 26)
abort();
exit(0);
}