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/* { dg-do compile } */
/* { dg-options "-O2 -fisolate-erroneous-paths-attribute -fdump-tree-isolate-paths -fdump-tree-phicprop1" } */
int z;
int y;
int * foo(int a) __attribute__((returns_nonnull));
int * bar(void) __attribute__((returns_nonnull));
int *
foo(int a)
{
switch (a)
{
case 0:
return &z;
default:
return (int *)0;
}
}
int *
bar (void)
{
return 0;
}
/* We testing that the path isolation code can take advantage of the
returns non-null attribute to isolate a path where NULL flows into
a return statement. We test this twice, once where the NULL flows
from a PHI, the second with an explicit return 0 in the IL.
We also verify that after isolation phi-cprop simplifies the
return statement so that it returns &z directly.
/* { dg-final { scan-tree-dump-times "__builtin_trap" 2 "isolate-paths"} } */
/* { dg-final { scan-tree-dump-times "return &z;" 1 "phicprop1"} } */
/* { dg-final { cleanup-tree-dump "isolate-paths" } } */
/* { dg-final { cleanup-tree-dump "phicprop1" } } */
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