diff --git a/gcc/testsuite/gcc.dg/pr109546.c b/gcc/testsuite/gcc.dg/pr109546.c new file mode 100644 index 00000000000..ba8af0f31fa --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr109546.c @@ -0,0 +1,24 @@ +/* { dg-do compile } */ +/* { dg-options "-O3 -fdump-tree-optimized" } */ + +void foo(void); +static int a, c; +static int *b = &a; +static int **d = &b; +void assert_fail() __attribute__((__noreturn__)); +int main() { + int *e = *d; + if (e == &a || e == &c); + else { + __builtin_unreachable(); + assert_fail(); + } + if (e == &a || e == &c); + else + foo(); +} + +/* { dg-final { scan-tree-dump-not "assert_fail" "optimized" } } */ +/* { dg-final { scan-tree-dump-not "foo" "optimized" } } */ + + diff --git a/gcc/tree-vrp.cc b/gcc/tree-vrp.cc index f4d484526c7..9b870640e23 100644 --- a/gcc/tree-vrp.cc +++ b/gcc/tree-vrp.cc @@ -150,7 +150,9 @@ remove_unreachable::remove_and_update_globals (bool final_p) // If this is already a constant condition, don't look either if (!lhs_p && !rhs_p) continue; - + // Do not remove addresses early. ie if (x == &y) + if (!final_p && lhs_p && TREE_CODE (gimple_cond_rhs (s)) == ADDR_EXPR) + continue; bool dominate_exit_p = true; FOR_EACH_GORI_EXPORT_NAME (m_ranger.gori (), e->src, name) {