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/* { dg-options "-O2 -fdump-tree-dse-details -fno-tree-fre" } */
#include <string.h>
#include <stdlib.h>
struct X
{
char mem0[10];
char mem1[10];
};
void blah (struct X);
void
foo1()
{
struct X x = { };
memset (x.mem1, 0, sizeof x.mem1);
blah (x);
}
void
foo2()
{
struct X x = { };
x.mem1[5] = 0;
blah (x);
}
void
bar1 ()
{
struct X x;
memset (&x, 0, sizeof x);
memset (&x.mem1, 0, sizeof x.mem1);
blah (x);
}
void
bar2 ()
{
struct X x;
memset (&x, 0, sizeof x);
x.mem1[5] = 0;
blah (x);
}
void
baz1 ()
{
struct X *x = calloc (sizeof (struct X), 1);
memset (&x->mem1, 0, sizeof x->mem1);
blah (*x);
}
void
baz2 ()
{
struct X *x = calloc (sizeof (struct X), 1);
x->mem1[5] = 0;
blah (*x);
}
/* { dg-final { scan-tree-dump-times "Deleted redundant call" 3 "dse1" } } */
/* { dg-final { scan-tree-dump-times "Deleted redundant store" 3 "dse1" } } */
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