From mboxrd@z Thu Jan 1 00:00:00 1970 From: Franz Sirl To: Diego Novillo Cc: gcc@gcc.gnu.org Subject: Re: SPEC95 failure on 3.0 branch Date: Wed, 10 Oct 2001 07:01:00 -0000 Message-id: <5.1.0.14.2.20011010160004.04ac5fd8@mail.lauterbach.com> References: <20011010095234.A6528@tornado.cygnus.com> X-SW-Source: 2001-10/msg00660.html 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 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 >+ >+ * doc/cpp.texi: Update. >+ >+ 2001-10-08 Neil Booth >+ >+ * 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 >+ >+ * unroll.c (loop_iterations): Extend check for multiple back edges. >+ >+ 2001-10-08 Jeffrey A Law >+ >+ * 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 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
, 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.