https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81418
Bug ID: 81418 Summary: [8 Regression] ICE in vect_get_vec_def_for_stmt_copy Product: gcc Version: 8.0 Status: UNCONFIRMED Keywords: ice-on-valid-code Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: asolokha at gmx dot com Target Milestone: --- gcc-8.0.0-alpha20170709 ICEs when compiling the following snippet w/ -O1 -ftree-loop-vectorize: int ol (int ku) { int zq = 0; while (ku < 1) { int y6; for (y6 = 0; y6 < 3; ++y6) zq += (char)ku; ++ku; } return zq; } % gcc-8.0.0-alpha20170709 -O1 -ftree-loop-vectorize -c -w mndyhqic.c during GIMPLE pass: vect mndyhqic.c: In function 'ol': mndyhqic.c:2:1: internal compiler error: in vect_get_vec_def_for_stmt_copy, at tree-vect-stmts.c:1522 ol (int ku) ^~ (As a side note, when compiling this w/ -O2 or higher, -ftree-loop-vectorize makes 8 branch generate something absolutely hilarious: https://godbolt.org/g/R4YW3b).