https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95172
Bug ID: 95172 Summary: wrong code at -O1 on x86_64-linux-gnu Product: gcc Version: unknown Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: qrzhang at gatech dot edu Target Milestone: --- Recent regression. Bisection points to g:b6ff3ddecfa93d53867afaaa078f85f $ gcc-trunk -v gcc version 11.0.0 20200516 (experimental) [master revision 53b4d52f114:91c1d944166:f5b461d453043c6b6dda50db0439e4c78b241f03] (GCC) $ gcc-trunk -O1 abc.c ; ./a.out 1 $ gcc-trunk abc.c ; ./a.out 0 $ cat abc.c int a, d; int *b = &a; short c; int main() { for (; c <= 4; c--) { for (; d;) ; a = 1; *b = 0; } printf("%d\n", a); }