https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63590
Bug ID: 63590 Summary: wrong code with -mstringop-strategy=vector_loop Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: zsojka at seznam dot cz Created attachment 33755 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33755&action=edit reduced testcase Output: $ gcc -O -mstringop-strategy=vector_loop testcase.c $ valgrind -q ./a.out ==6236== Jump to the invalid address stated on the next line ==6236== at 0x0: ??? ==6236== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==6236== ==6236== ==6236== Process terminating with default action of signal 11 (SIGSEGV) ==6236== Bad permissions for mapped region at address 0x0 ==6236== at 0x0: ??? Segmentation fault The return address is being overwritten while initialising l[]. Tested revisions: r216420 - fail 4_9 r213788 - fail 4_8 - unrecognized argument in option '-mstringop-strategy=vector_loop'