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expr.c (store_constructor): Only set RTX_UNCHANGING_P for read-only field if cleared is 0.

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* expr.c (store_constructor): Only set RTX_UNCHANGING_P for
	read-only field if cleared is 0.

	* gcc.dg/20031202-1.c: New test.

From-SVN: r74251
This commit is contained in:
Jakub Jelinek 2003-12-03 23:40:58 +01:00
parent 26d86d940e
commit 8ecc63eb27
4 changed files with 59 additions and 3 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2003-12-03 Jakub Jelinek <jakub@redhat.com>
* expr.c (store_constructor): Only set RTX_UNCHANGING_P for
read-only field if cleared is 0.
2003-12-03 Nathanael Nerode <neroden@gcc.gnu.org>
* config.gcc: Mark obsolete targets for GCC 3.4.

5
gcc/expr.c
View File

@ -4643,7 +4643,10 @@ store_constructor (tree exp, rtx target, int cleared, HOST_WIDE_INT size)
highest_pow2_factor (offset));
}
if (TREE_READONLY (field))
/* If the constructor has been cleared, setting RTX_UNCHANGING_P
on the MEM might lead to scheduling the clearing after the
store. */
if (TREE_READONLY (field) && !cleared)
{
if (GET_CODE (to_rtx) == MEM)
to_rtx = copy_rtx (to_rtx);

8
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2003-12-03 Jakub Jelinek <jakub@redhat.com>
* gcc.dg/20031202-1.c: New test.
2003-12-03 Mark Mitchell <mark@codesourcery.com>
PR c++/10771
@ -10,12 +14,12 @@
2003-12-02 Giovanni Bajo <giovannibajo@gcc.gnu.org>
PR c++/10126
PR c++/10126
* g++.dg/template/ptrmem8.C: New test.
2003-12-02 Giovanni Bajo <giovannibajo@gcc.gnu.org>
PR c++/12573
PR c++/12573
* g++.dg/template/dependent-expr3.C: New test.
2003-12-01 James Lemke <jim@wasabisystems.com>

44
gcc/testsuite/gcc.dg/20031202-1.c Normal file
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@ -0,0 +1,44 @@
/* { dg-do run } */
/* { dg-options "-O2" } */
/* { dg-options "-O2 -mtune=i686" { target i?86-*-* } } */
extern void abort (void);
extern void exit (int);
struct A { char p[6]; } __attribute__((packed));
struct B {
struct A a;
void * const b;
struct A const * const c;
struct A const *d;
};
char v;
int __attribute__((noinline))
foo (struct B *b)
{
int i;
for (i = 0; i < 6; ++i)
if (b->a.p[i])
abort ();
if (b->b != &v || b->c || b->d)
abort ();
return 12;
}
int __attribute__((noinline))
bar (void *x)
{
__asm __volatile ("" : "=r" (x) : "0" (x));
struct B y = { .b = x, .c = (void *) 0 };
return foo (&y) + 1;
}
int
main (void)
{
if (bar (&v) != 13)
abort ();
exit (0);
}