https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107129
Bug ID: 107129 Summary: [13 Regression] False positive -Wstringop-overflow warning with -O2 or -O3 Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: daniel at constexpr dot org Target Milestone: --- Created attachment 53652 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53652&action=edit Reduced testcase The attached testcase produces the following warning with GCC 13.0.0 20221002 (commit 3290dcf): $ /opt/gcc-dev/bin/c++ -O2 -c test.cpp test.cpp: In member function ‘void C::f()’: test.cpp:39:33: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=] 39 | c[i] = e(1.f - i, i); | ~^~~~~~~~~~~~ test.cpp:9:23: note: at offset 1 into destination object ‘C4::r’ of size 1 9 | unsigned char r; |