diff options
| author | Richard Biener <rguenther@suse.de> | 2017-03-08 14:10:47 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2017-03-08 14:10:47 +0000 |
| commit | edfcd7e3d471b9dde2d9a84490a850d2f850f381 (patch) | |
| tree | 8052c1b41778ff9f1e2e9505b8521a982efc2e63 /gcc/tree-ssa-uninit.c | |
| parent | 6659fe59f3c39e991149fe60f17d0628d771a454 (diff) | |
re PR tree-optimization/79955 (GLIBC build fails after r245840)
2017-03-08 Richard Biener <rguenther@suse.de>
PR tree-optimization/79955
* tree-ssa-uninit.c (warn_uninitialized_vars): Do not warn
for accesses that are completely outside of the variable.
* gcc.dg/uninit-24.c: New testcase.
From-SVN: r245976
Diffstat (limited to 'gcc/tree-ssa-uninit.c')
| -rw-r--r-- | gcc/tree-ssa-uninit.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/tree-ssa-uninit.c b/gcc/tree-ssa-uninit.c index 1805c674ea4..e019ecc9d29 100644 --- a/gcc/tree-ssa-uninit.c +++ b/gcc/tree-ssa-uninit.c @@ -287,6 +287,17 @@ warn_uninitialized_vars (bool warn_possibly_uninitialized) || TREE_NO_WARNING (base)) continue; + /* Do not warn if the access is fully outside of the + variable. */ + if (ref.size != -1 + && ref.max_size == ref.size + && (ref.offset + ref.size <= 0 + || (ref.offset >= 0 + && TREE_CODE (DECL_SIZE (base)) == INTEGER_CST + && compare_tree_int (DECL_SIZE (base), + ref.offset) <= 0))) + continue; + /* Limit the walking to a constant number of stmts after we overcommit quadratic behavior for small functions and O(n) behavior. */ |