[Bug rtl-optimization/41295] New: [4.5 Regression] gfortran.dg/loc_2.f90 -O3 -g fails on SH with orphaned debug_insn

[kkojima at gcc dot gnu dot org]

After vta merge, gfortran.dg/loc_2.f90 fails on sh4-unknown-linux-gnu
for -O3 -g with

loc_2.f90:114:0: internal compiler error: in reload_combine_note_use, at
postreload.c:1097

which is the result of

postreload.c:
1097            gcc_assert (regno < FIRST_PSEUDO_REGISTER);

The problematic regno 1434 came from a debug insn

(debug_insn 1346 1344 1350 3 loc_2.f90:46 (var_location:SI offset (reg:SI 1434
[ ivtmp.132 ])) -1 (nil))

which looks orphaned at postreload pass.  There are no other insns
referring to reg 1434 at that pass.


-- 
           Summary: [4.5 Regression] gfortran.dg/loc_2.f90 -O3 -g fails on
                    SH with orphaned debug_insn
           Product: gcc
           Version: 4.5.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kkojima at gcc dot gnu dot org
GCC target triplet: sh4-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41295