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/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-vrp1-stats -fdump-tree-dom1-stats" } */
void foo();
void bla();
void bar();
/* In the following two cases, we should be able to thread edge through
the loop header. */
void thread_entry_through_header (void)
{
int i;
for (i = 0; i < 170; i++)
bla ();
}
void thread_latch_through_header (void)
{
int i = 0;
int first = 1;
do
{
if (first)
foo ();
first = 0;
bla ();
} while (i++ < 100);
}
/* This is a TODO -- it is correct to thread both entry and latch edge through
the header, but we do not handle this case yet. */
void dont_thread_1 (void)
{
int i = 0;
int first = 1;
do
{
if (first)
foo ();
else
bar ();
first = 0;
bla ();
} while (i++ < 100);
}
/* Avoid threading in the following two cases, to prevent creating subloops. */
void dont_thread_2 (int first)
{
int i = 0;
do
{
if (first)
foo ();
else
bar ();
first = 0;
bla ();
} while (i++ < 100);
}
void dont_thread_3 (int nfirst)
{
int i = 0;
int first = 0;
do
{
if (first)
foo ();
else
bar ();
first = nfirst;
bla ();
} while (i++ < 100);
}
/* Avoid threading in this case, in order to avoid creating loop with
multiple entries. */
void dont_thread_4 (int a, int nfirst)
{
int i = 0;
int first;
if (a)
first = 0;
else
first = 1;
do
{
if (first)
foo ();
else
bar ();
first = nfirst;
bla ();
} while (i++ < 100);
}
/* { dg-final { scan-tree-dump-times "Jumps threaded: 1" 1 "vrp1"} } */
/* { dg-final { scan-tree-dump-times "Jumps threaded: 2" 0 "vrp1"} } */
/* { dg-final { scan-tree-dump-times "Jumps threaded: 1" 0 "dom1"} } */
/* { dg-final { scan-tree-dump-times "Jumps threaded: 2" 1 "dom1"} } */
/* { dg-final { cleanup-tree-dump "dom1" } } */
/* { dg-final { cleanup-tree-dump "vrp1" } } */
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