https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62283
Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2014-08-27 Blocks| |53947 Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org Summary|SSE optimization fails |basic-block vectorization | |fails Ever confirmed|0 |1 --- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. This is because SLP analysis sees a load from *alpha which it doesn't consider handling as extern def as it handles parameters. Let me see if I can easily fix this.