[Bug middle-end/26279] New: [4.2 regression] ICE in do_compare_rtx_and_jump

["schwab at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>]

r110954 broke libada on ia64:

/tmp/cvs/gcc-20060214/Build/./gcc/xgcc -B/tmp/cvs/gcc-20060214/Build/./gcc/
-B/tmp/cvs/gcc-20060214/Build/root/ia64-suse-linux/bin/
-B/tmp/cvs/gcc-20060214/Build/root/ia64-suse-linux/lib/ -isystem
/tmp/cvs/gcc-20060214/Build/root/ia64-suse-linux/include -isystem
/tmp/cvs/gcc-20060214/Build/root/ia64-suse-linux/sys-include -c -g -O2 -fPIC
-DUSE_GAS_SYMVER      -W -Wall -gnatpg  a-strunb.adb -o a-strunb.o
+===========================GNAT BUG DETECTED==============================+
| 4.2.0 20060214 (experimental) (ia64-suse-linux-gnu) GCC error:           |
| in do_compare_rtx_and_jump, at dojump.c:945                              |
| Error detected at a-strunb.adb:1050:1                                    |

(gdb) up
During symbol reading, unsupported tag: 'DW_TAG_const_type'.
During symbol reading, unsupported tag: 'DW_TAG_const_type'.
#1  0x40000000008444b0 in do_compare_rtx_and_jump (op0=0x2000000001d68840, 
    op1=<value optimized out>, code=LE, unsignedp=0, mode=TImode, size=0x0, 
    if_false_label=0x0, if_true_label=0x20000000016e3610) at dojump.c:945
945               gcc_unreachable ();
(gdb) l
940               do_jump_by_parts_equality_rtx (mode, op0, op1, if_true_label,
941                                              if_false_label);
942               break;
943
944             default:
945               gcc_unreachable ();
946             }
947         }
948       else
949         emit_cmp_and_jump_insns (op0, op1, code, size, mode, unsignedp,


-- 
           Summary: [4.2 regression] ICE in do_compare_rtx_and_jump
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code, build
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: schwab at suse dot de
GCC target triplet: ia64-*-*


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26279