Re: SPEC95 failure on 3.0 branch

[Franz Sirl <Franz.Sirl-kernel@lauterbach.com>]

Checkout the patch I posted 2h ago.

Franz.


At 15:52 10.10.2001, Diego Novillo wrote:
>This failure started showing up on Oct09.  We fail to compile
>124.m88ksim.  The compiler ICEs in unroll.c:
>
>---------------------------------------------------------------------------
>dpath.c: In function `execute':
>dpath.c:863: Internal compiler error in loop_iterations, at unroll.c:3510
>Please submit a full bug report,
>with preprocessed source if appropriate.
>See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.
>specmake: *** [dpath.o] Error 1
>---------------------------------------------------------------------------
>
>Looking at the ChangeLog diffs it looks as if Franz's patch
>could've caused this:
>
>+ 2001-10-08  Neil Booth  <neil@daikokuya.demon.co.uk>
>+
>+       * doc/cpp.texi: Update.
>+
>+ 2001-10-08  Neil Booth  <neil@daikokuya.demon.co.uk>
>+
>+       * cppmacro.c (_cpp_create_definition): Leave comments off.
>+       * cpplex.c (_cpp_lex_token): Don't save comments if skipping.
>+
>+       * doc/cpp.texi: Update.
>+
>+ 2001-10-08  Franz Sirl  <Franz.Sirl-kernel@lauterbach.com>
>+
>+       * unroll.c (loop_iterations): Extend check for multiple back edges.
>+
>+ 2001-10-08  Jeffrey A Law  <law@cygnus.com>
>+
>+       * sibcall.c (optimize_sibling_and_tail_recursive_calls): Call
>+       purge_mem_unchanging_flag on all instructions, not just on those
>+       before NOTE_INSN_FUNCTION_BEG.
>+
>
>This is a debugging session of this failure.  I'm not too sure
>what I'm looking for.  Hopefully this will give some context:
>
>---------------------------------------------------------------------------
>$ gdb 
>/home/dnovillo/perf/sandbox-gcc-3_0-branch/i686/inst/lib/gcc-lib/i686-pc-linux-gnu/3.0.2/cc1
>[ ... ]
>
>(gdb) b unroll.c:3510
>Breakpoint 1 at 0x81505b0: file 
>/home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/unroll.c, line 3510.
>
>(gdb) run  -fpreprocessed dpath.i -quiet -dumpbase dpath.c -O2 -version -o 
>dpath.s
>Starting program: 
>/home/dnovillo/perf/sandbox-gcc-3_0-branch/i686/inst/lib/gcc-lib/i686-pc-linux-gnu/3.0.2/cc1 
>-fpreprocessed dpath.i -quiet -dumpbase dpath.c -O2 -version -o dpath.s
>During symbol reading, register number 1769234796 too large (max 32) in 
>symbol buf.
>GNU CPP version 3.0.2 20011010 (prerelease) (cpplib) (i386 Linux/ELF)
>GNU C version 3.0.2 20011010 (prerelease) (i686-pc-linux-gnu)
>         compiled by GNU C version 3.0.2 20011010 (prerelease).
>/home/dnovillo/SPEC95/benchspec/CINT95/124.m88ksim/src/dpath.c: In 
>function `execute':
>/home/dnovillo/SPEC95/benchspec/CINT95/124.m88ksim/src/dpath.c:863: 
>Internal compiler error in loop_iterations, at unroll.c:3510
>Please submit a full bug report,
>with preprocessed source if appropriate.
>See <URL: http://www.gnu.org/software/gcc/bugs.html > for instructions.
>
>Breakpoint 1, loop_iterations (loop=0x83a6418)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/unroll.c:3511
>3511                  && INSN_LUID (JUMP_LABEL (temp)) < INSN_LUID 
>(loop->cont))
>
>(gdb) l 3511
>3506
>3507          do
>3508            {
>3509              if (GET_CODE (temp) == JUMP_INSN
>3510                  && INSN_LUID (JUMP_LABEL (temp)) > INSN_LUID (loop->top)
>3511                  && INSN_LUID (JUMP_LABEL (temp)) < INSN_LUID 
>(loop->cont))
>3512                {
>3513                  if (loop_dump_stream)
>3514                    fprintf (loop_dump_stream,
>3515                             "Loop iterations: Loop has multiple back 
>edges.\n");
>
>(gdb) bt
>#0  loop_iterations (loop=0x83a6418)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/unroll.c:3511
>#1  0x08144314 in strength_reduce (loop=0x83a6418, flags=0)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/loop.c:4276
>#2  0x0813f4ad in scan_loop (loop=0x83a6418, flags=0)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/loop.c:1029
>#3  0x0813f0a7 in loop_optimize (f=0x4030c380, dumpfile=0x0, flags=0)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/loop.c:460
>#4  0x0808016c in rest_of_compilation (decl=0x4025eea0)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/toplev.c:3177
>#5  0x08058b09 in c_expand_body (fndecl=0x4025eea0, nested_p=0)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/c-decl.c:6781
>#6  0x0805897d in finish_function (nested=0)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/c-decl.c:6697
>#7  0x0804a06d in yyparse_1 () at /usr/lib/bison.simple:324
>#8  0x0807f048 in compile_file (name=0xbffff4c2 "dpath.i")
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/toplev.c:2369
>#9  0x08082daa in main (argc=10, argv=0xbffff2b4)
>     at /home/dnovillo/perf/sandbox-gcc-3_0-branch/src/gcc/toplev.c:4990
>#10 0x40047177 in __libc_start_main (main=0x8082890 <main>, argc=10,
>     ubp_av=0xbffff2b4, init=0x80490d4 <_init>, fini=0x823b9e0 <_fini>,
>     rtld_fini=0x4000e184 <_dl_fini>, stack_end=0xbffff2ac)
>     at ../sysdeps/generic/libc-start.c:129
>
>(gdb) pr loop->top
>(code_label 3489 3487 3488 311 "" "" [1 uses])
>
>(gdb) pr loop->cont
>(note 2037 2019 3485 NOTE_INSN_LOOP_CONT 0)
>
>(gdb) pr temp
>(jump_insn 2030 2029 2056 (set (pc)
>         (if_then_else (ne (reg:CCZ 17 flags)
>                 (const_int 0 [0x0]))
>             (label_ref 3489)
>             (pc))) -1 (nil)
>     (nil))
>---------------------------------------------------------------------------
>
>Diego.