[Bug rtl-optimization/55838] [4.6/4.7/4.8 Regression] ICE in extract_insn (unrecognizable insn) with -O -funroll-loops

[steven at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55838



--- Comment #7 from Steven Bosscher <steven at gcc dot gnu.org> 2013-01-01 
19:52:48 UTC ---

... but actually it looks like it exists even before that:



(gdb) p debug_rtx(desc->niter_expr)

(udiv:QI (minus:QI (const_int -126 [0xffffffffffffff82])

        (subreg:QI (reg:SI 113 [ ivtmp.14 ]) 0))

    (const_int 129 [0x81]))



That's a nonsense QImode udiv from loop-iv.