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| author | Jonathan Wakely <jwakely@redhat.com> | 2022-12-05 12:53:42 +0000 |
|---|---|---|
| committer | Jonathan Wakely <jwakely@redhat.com> | 2022-12-06 21:33:29 +0000 |
| commit | 4ba94abf147fe7778a7541849ce27cafee74df9b (patch) | |
| tree | 74224142ac680223ae72453aee46f1aaede82f85 /libcpp | |
| parent | af177d7280668e5b21560165dc828754618e6621 (diff) | |
| download | gcc-4ba94abf147fe7778a7541849ce27cafee74df9b.zip gcc-4ba94abf147fe7778a7541849ce27cafee74df9b.tar.gz gcc-4ba94abf147fe7778a7541849ce27cafee74df9b.tar.bz2 | |
libstdc++: Add hint to compiler about vector invariants [PR106434]
The PR shows a bogus warning where jump threading generates code for the
undefined case that the insertion point is a value-initialized iterator
but _M_finish and _M_end_of_storage are unequal (so at least one must be
non-null). Using __builtin_unreachable() removes the bogus warning. Also
add an assertion to diagnose undefined misuses of a null iterator here,
so we don't just silently optimize that undefined code to something
unsafe.
libstdc++-v3/ChangeLog:
PR c++/106434
* include/bits/vector.tcc (insert(const_iterator, const T&)):
Add assertion and optimization hint that the iterator for the
insertion point must be non-null.
Diffstat (limited to 'libcpp')
0 files changed, 0 insertions, 0 deletions