https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65204
Bug ID: 65204 Summary: Aligned address optimization not detected Product: gcc Version: 5.0 Status: UNCONFIRMED Keywords: missed-optimization Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: ktietz at gcc dot gnu.org CC: rguenth at gcc dot gnu.org By testing on c++-delayed-folding branch I noticed that gcc doesn't optimize issues as tested in 'c-c++-common/fold-bitand4.c' anymore. By looking deeper into it it shows that CCP doesn't simplify this because it doesn't track about copy-of. The testcase demonstrates this: typedef char char4[4] __attribute__ ((aligned (4))); char4 c4[4] __attribute__ ((aligned (16))); int f (int i) { __SIZE_TYPE__ h = (__SIZE_TYPE__)&c4[i]; /* 0 */ return 3 & h; }