https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84477
Bug ID: 84477 Summary: internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:255 Product: gcc Version: 5.4.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: tianjiao.sun.2010 at gmail dot com Target Milestone: --- Created attachment 43466 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43466&action=edit example code Hi, Compiling the attached file with -fPIC -Wall -march=haswell -O3 -ffast-math -shared resulted in error: internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:255 The code is a simplified version of our original code which is a local assembly kernel for finite element method. I deleted as many lines as possible to preserve the same error in compilation. Note that swapping line 33 and 35 somehow fix the problem. Compiling with -fno-tree-loop-vectorize also fix the problem. This affects GCC 5.x only. Thanks, -TJ