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re PR rtl-optimization/5844 (Bad code generated for -O2 -mcpu=i586)

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PR optimization/5844
	* gcc.dg/20020310-1.c: New test.

From-SVN: r50566
This commit is contained in:
Jakub Jelinek 2002-03-11 11:12:03 +01:00
parent eb58b2086c
commit 5ddec02e71
3 changed files with 60 additions and 0 deletions
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1
gcc/ChangeLog
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@ -283,6 +283,7 @@ Thu Mar 7 16:33:54 CET 2002 Jan Hubicka <jh@suse.cz>
2002-03-06 Richard Henderson <rth@redhat.com>
PR optimization/5844
* genemit.c (gen_exp): New argument used. Invoke copy_rtx
if used indicates we've already emitted one copy of an operand.
(gen_insn, gen_expand, output_add_clobbers): Supply a null used.

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2002-03-11 Jakub Jelinek <jakub@redhat.com>
PR optimization/5844
* gcc.dg/20020310-1.c: New test.
2002-03-09 Michael Meissner <meissner@redhat.com>
* gcc.c-torture/execute/memcpy-2.c: New test.

54
gcc/testsuite/gcc.dg/20020310-1.c Normal file
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@ -0,0 +1,54 @@
/* PR optimization/5844
This testcase was miscompiled because of an rtx sharing bug. */
/* { dg-do run } */
/* { dg-options "-O2" } */
/* { dg-options "-O2 -mcpu=i586" { target i?86-*-* } } */
struct A
{
struct A *a;
int b;
};
struct B
{
struct A *c;
unsigned int d;
};
struct A p = { &p, -1 };
struct B q = { &p, 0 };
extern void abort (void);
extern void exit (int);
struct B *
foo (void)
{
return &q;
}
void
bar (void)
{
struct B *e = foo ();
struct A *f = e->c;
int g = f->b;
if (++g == 0)
{
e->d++;
e->c = f->a;
}
f->b = g;
}
int
main ()
{
bar ();
if (p.b != 0 || q.d != 1 || q.c != &p)
abort ();
exit (0);
}