https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98599
--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to David Malcolm from comment #4) > I set them so that each stmt has a unique id, unique across all functions. > I was assuming from the comments I quoted above in gimple.h that this is > safe to do, but it sounds like from your comment that WPA makes assumptions > that the uids don't change. If that's the case, then I need to rethink > things, and the gimple.h comments probably need updating (or WPA needs to > allow for uids to change, but maybe that's hard to do?) So looking into the code, in WPA when we stream out cgraph_edge, we record to which GIMPLE statement an edge points to: gcc/lto-cgraph.c:264-265 and the info is later used in LTRANS where you see the fatal_error. So I would recommend using a separate table where you will assign a unique ID to statements. And please update the comment in gimple.h.
