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| author | Richard Biener <rguenther@suse.de> | 2020-11-13 11:31:22 +0100 |
|---|---|---|
| committer | Richard Biener <rguenther@suse.de> | 2020-11-13 12:24:54 +0100 |
| commit | dcfd302a79a5e2ea3bb16fc4fc45a5ee31cc0eab (patch) | |
| tree | be85f1a2cea59235fefe077bbd5125b1664fa19f | |
| parent | 3793ecc10fd4f8be8abd65ba41824f3cc91238e7 (diff) | |
| download | gcc-dcfd302a79a5e2ea3bb16fc4fc45a5ee31cc0eab.zip gcc-dcfd302a79a5e2ea3bb16fc4fc45a5ee31cc0eab.tar.gz gcc-dcfd302a79a5e2ea3bb16fc4fc45a5ee31cc0eab.tar.bz2 | |
tree-optimization/97812 - fix range query in VRP assert discovery
This makes sure to properly extend the input range before seeing
whether it fits the target.
2020-11-13 Richard Biener <rguenther@suse.de>
PR tree-optimization/97812
* tree-vrp.c (register_edge_assert_for_2): Extend the range
according to its sign before seeing whether it fits.
* gcc.dg/torture/pr97812.c: New testcase.
| -rw-r--r-- | gcc/testsuite/gcc.dg/torture/pr97812.c | 15 | ||||
| -rw-r--r-- | gcc/tree-vrp.c | 10 |
2 files changed, 23 insertions, 2 deletions
diff --git a/gcc/testsuite/gcc.dg/torture/pr97812.c b/gcc/testsuite/gcc.dg/torture/pr97812.c new file mode 100644 index 0000000..4d468ad --- /dev/null +++ b/gcc/testsuite/gcc.dg/torture/pr97812.c @@ -0,0 +1,15 @@ +/* { dg-do run } */ +/* { dg-additional-options "-fdisable-tree-evrp" } */ + +unsigned char c; + +int main() { +volatile short b = 4066; + unsigned short bp = b; + unsigned d = bp & 2305; + signed char e = d; + c = e ? : e; + if (!d) + __builtin_abort (); + return 0; +} diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index 54ce017..d661866 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -1740,8 +1740,14 @@ register_edge_assert_for_2 (tree name, edge e, && ((TYPE_PRECISION (TREE_TYPE (name)) > TYPE_PRECISION (TREE_TYPE (rhs1))) || (get_range_info (rhs1, &rmin, &rmax) == VR_RANGE - && wi::fits_to_tree_p (rmin, TREE_TYPE (name)) - && wi::fits_to_tree_p (rmax, TREE_TYPE (name))))) + && wi::fits_to_tree_p + (widest_int::from (rmin, + TYPE_SIGN (TREE_TYPE (rhs1))), + TREE_TYPE (name)) + && wi::fits_to_tree_p + (widest_int::from (rmax, + TYPE_SIGN (TREE_TYPE (rhs1))), + TREE_TYPE (name))))) add_assert_info (asserts, rhs1, rhs1, comp_code, fold_convert (TREE_TYPE (rhs1), val)); } |