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| author | Richard Biener <rguenther@suse.de> | 2017-11-28 08:15:03 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2017-11-28 08:15:03 +0000 |
| commit | 6a7a7f92bdae0e62170d4a556c2b007655960bf3 (patch) | |
| tree | f12aef74ee4ee5d51cbbcba3784a2c521fbc3da5 /gcc | |
| parent | d2eaaa891005cdaf891d6576e351ba846d1f0346 (diff) | |
| download | gcc-6a7a7f92bdae0e62170d4a556c2b007655960bf3.zip gcc-6a7a7f92bdae0e62170d4a556c2b007655960bf3.tar.gz gcc-6a7a7f92bdae0e62170d4a556c2b007655960bf3.tar.bz2 | |
re PR target/83158 (gcc.target/i386/pr78057.c fail)
2017-11-28 Richard Biener <rguenther@suse.de>
PR tree-optimization/83158
* tree-vrp.c (intersect_ranges): Prefer ~[0, 0] in a few more
cases.
From-SVN: r255190
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/tree-vrp.c | 9 |
2 files changed, 12 insertions, 3 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index fe6b562..7f5e6cb 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2017-11-28 Richard Biener <rguenther@suse.de> + + PR tree-optimization/83158 + * tree-vrp.c (intersect_ranges): Prefer ~[0, 0] in a few more + cases. + 2017-11-28 Segher Boessenkool <segher@kernel.crashing.org> PR 81288/target diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 5f9baa3..1217f82 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -6021,11 +6021,14 @@ intersect_ranges (enum value_range_type *vr0type, && vrp_val_is_max (vr1max)) ; /* Choose the anti-range if it is ~[0,0], that range is special - enough to special case when vr1's range is relatively wide. */ + enough to special case when vr1's range is relatively wide. + At least for types bigger than int - this covers pointers + and arguments to functions like ctz. */ else if (*vr0min == *vr0max && integer_zerop (*vr0min) - && (TYPE_PRECISION (TREE_TYPE (*vr0min)) - == TYPE_PRECISION (ptr_type_node)) + && ((TYPE_PRECISION (TREE_TYPE (*vr0min)) + >= TYPE_PRECISION (integer_type_node)) + || POINTER_TYPE_P (TREE_TYPE (*vr0min))) && TREE_CODE (vr1max) == INTEGER_CST && TREE_CODE (vr1min) == INTEGER_CST && (wi::clz (wi::to_wide (vr1max) - wi::to_wide (vr1min)) |