[Bug rtl-optimization/56117] [4.8 Regression] ICE: in cselib_subst_to_values, at cselib.c:1853 with -O2 -fsched2-use-superblocks and __builtin_prefetch()

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56117



--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-01-28 
08:51:39 UTC ---

Created attachment 29289

  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29289

gcc48-pr56117.patch



Untested fix.  For MEMs, sched-deps.c is calling cselib_lookup_from_insn, but

for PREFETCH it wasn't doing that.  As this is before cselib_process_insn is

called, some REGs mentioned in the pattern might be never looked up yet at that

point.