diff options
| -rw-r--r-- | gcc/ChangeLog | 7 | ||||
| -rw-r--r-- | gcc/testsuite/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/testsuite/gcc.dg/tree-ssa/vrp79.c | 23 | ||||
| -rw-r--r-- | gcc/tree-vrp.c | 9 |
4 files changed, 41 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 88ec752..c04f5cb 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,10 @@ +2012-08-22 Marc Glisse <marc.glisse@inria.fr> + + PR tree-optimization/54317 + * tree-vrp.c (extract_range_from_binary_expr_1): Test for + double_int overflow. + Remove dead tests. + 2012-08-22 Jakub Jelinek <jakub@redhat.com> * tree-vrp.c (find_assert_locations): Skip also edges diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog index 6724380..049e2d1 100644 --- a/gcc/testsuite/ChangeLog +++ b/gcc/testsuite/ChangeLog @@ -1,3 +1,8 @@ +2012-08-22 Marc Glisse <marc.glisse@inria.fr> + + PR tree-optimization/54317 + * gcc.dg/tree-ssa/vrp79.c: New testcase. + 2012-08-21 Oleg Endo <olegendo@gcc.gnu.org> PR target/39423 diff --git a/gcc/testsuite/gcc.dg/tree-ssa/vrp79.c b/gcc/testsuite/gcc.dg/tree-ssa/vrp79.c new file mode 100644 index 0000000..88c1bd8 --- /dev/null +++ b/gcc/testsuite/gcc.dg/tree-ssa/vrp79.c @@ -0,0 +1,23 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fdump-tree-optimized" } */ + +#ifdef __SIZEOF_INT128__ +typedef unsigned __int128 NT; +#else +typedef unsigned long long NT; +#endif + +extern void do_not_go_away (); + +void f (NT x, NT y) +{ + NT n = 1; + n <<= (__CHAR_BIT__ * sizeof (NT) - 1); + if (x > n) return; + if (y > n) return; + NT z = x + y; + if (z == 42) do_not_go_away (); +} + +/* { dg-final { scan-tree-dump "do_not_go_away" "optimized" } } */ +/* { dg-final { cleanup-tree-dump "optimized" } } */ diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 0aa1dc7..f949e8b 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -2474,18 +2474,21 @@ extract_range_from_binary_expr_1 (value_range_t *vr, { /* Min underflow or max overflow. The range kind changes to VR_ANTI_RANGE. */ + bool covers = false; double_int tem = tmin; gcc_assert ((min_ovf == -1 && max_ovf == 0) || (max_ovf == 1 && min_ovf == 0)); type = VR_ANTI_RANGE; tmin = double_int_add (tmax, double_int_one); + if (double_int_cmp (tmin, tmax, uns) < 0) + covers = true; tmax = double_int_add (tem, double_int_minus_one); + if (double_int_cmp (tmax, tem, uns) > 0) + covers = true; /* If the anti-range would cover nothing, drop to varying. Likewise if the anti-range bounds are outside of the types values. */ - if (double_int_cmp (tmin, tmax, uns) > 0 - || double_int_cmp (tmin, type_min, uns) < 0 - || double_int_cmp (tmax, type_max, uns) > 0) + if (covers || double_int_cmp (tmin, tmax, uns) > 0) { set_value_range_to_varying (vr); return; |