http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60912
Bug ID: 60912 Summary: [4.10 Regression] wrong code with -O -fno-inline -fipa-pta Product: gcc Version: 4.10.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: ipa Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz Created attachment 32647 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32647&action=edit reduced testcase (g++.dg/tree-ssa/20040317-1.C) Output: $ g++ -O -fno-inline -fipa-pta testcase.C $ ./a.out Segmentation fault Relevant disassembly diff 4.9/4.10: @@ -61,9 +61,8 @@ mov QWORD PTR [rax], 0 mov rdi, rax call _ZN3BarC1Ev - mov rax, QWORD PTR [rbx] mov rdi, rbx - call [QWORD PTR [rax]] + call [QWORD PTR ds:0] mov eax, 0 pop rbx .cfi_def_cfa_offset 8 In 4.10, vtable seems to be expected to be constant 0.