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| author | Richard Biener <rguenther@suse.de> | 2018-12-03 13:38:20 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2018-12-03 13:38:20 +0000 |
| commit | 476a31b55b5471262b567bb00fe8f9f04417a11e (patch) | |
| tree | 2281c5a802997ea1eca1085ce6fda9c08b5a7a4a /gcc/tree-vrp.c | |
| parent | 959ded615c23a9595c7965f9373c578d2cb4afa3 (diff) | |
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re PR tree-optimization/88301 (Optimization regression with undefined unsigned overflow)
2018-12-03 Richard Biener <rguenther@suse.de>
PR tree-optimization/88301
* tree-vrp.c (register_edge_assert_for_2): Handle conversions
that do not change the value by registering the same assert
for the operand.
* gcc.dg/tree-ssa/evrp13.c: New testcase.
From-SVN: r266739
Diffstat (limited to 'gcc/tree-vrp.c')
| -rw-r--r-- | gcc/tree-vrp.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/gcc/tree-vrp.c b/gcc/tree-vrp.c index aa6309e..b00eca8 100644 --- a/gcc/tree-vrp.c +++ b/gcc/tree-vrp.c @@ -2966,6 +2966,23 @@ register_edge_assert_for_2 (tree name, edge e, add_assert_info (asserts, name2, tmp, new_comp_code, new_val); } + /* If we have a conversion that doesn't change the value of the source + simply register the same assert for it. */ + if (CONVERT_EXPR_CODE_P (rhs_code)) + { + wide_int rmin, rmax; + tree rhs1 = gimple_assign_rhs1 (def_stmt); + if (INTEGRAL_TYPE_P (TREE_TYPE (rhs1)) + && int_fits_type_p (val, TREE_TYPE (rhs1)) + && ((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))))) + add_assert_info (asserts, rhs1, rhs1, + comp_code, fold_convert (TREE_TYPE (rhs1), val)); + } + /* Add asserts for NAME cmp CST and NAME being defined as NAME = NAME2 & CST2. |