Re: Notes on the merge

[Franz Sirl <Franz dot Sirl-kernel at lauterbach dot com>]

At 17:31 Uhr -0000 04.04.1998, Jeffrey A Law wrote:
>Kenner made some pretty significant changes to how xm files are
>handled.  Hopefully I got configure.in properly merged after these
>changes.
>
>Note in rs6000/sysv4.h, there's a include of linux.h that can
>probably disappear with a minor configure.in tweak.
>
>
>floating point conditional moves on the x86 are disabled and integer
>conditional moves have been simplified.  Normally I wouldn't mention
>the simplified integer conditional moves, except we've had trouble
>with them in the past.  Hopefully our fixes to jump.c make the
>simplification safe.
>
>
>Kenner made some changes to ABI_32 on the MIPS port.  I've asked Jim
>to review them to make sure they're OK.

Hi,

on powerpc-unknown-linux-gnu everything compiled fine and during make
check-gcc I saw no regression.
I have included a gdb-backtrace of a SIGSEGV during compilation of one of
the newer tests (BTW, is the switch-1.c testcase I sent in OK?), looks like
a NULL-pointer dereference in rtlanal.c. The test failed before and after
the merge.

Bye,
Franz.


Failing test:
gcc/testsuite/gcc.c-torture/compile/980329-1.c  -w  -O2
-fomit-frame-pointer -finline-functions -funroll-all-loops

gdb-backtrace:
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This GDB was configured as "powerpc-unknown-linux-gnu"...
Program terminated with signal 11, Segmentation fault.
#0  0x188df54 in single_set (insn=0x0) at ../../gcc/rtlanal.c:620
620	  if (GET_RTX_CLASS (GET_CODE (insn)) != 'i')
(gdb) bt
#0  0x188df54 in single_set (insn=0x0) at ../../gcc/rtlanal.c:620
#1  0x18d0d88 in can_reverse_comparison_p (comparison=0x0, insn=0x1a6bba8)
    at ../../gcc/jump.c:2886
#2  0x18d2180 in invert_exp (x=0x1a6bb78, insn=0x1a6bba8)
    at ../../gcc/jump.c:3846
#3  0x18d224c in invert_exp (x=0x1a6bb68, insn=0x1a6bba8)
    at ../../gcc/jump.c:3863
#4  0x18f3290 in copy_loop_body (copy_start=0x1a652b8, copy_end=0x1a653d0,
    map=0x7fffcc70, exit_label=0x1a6baf0, last_iteration=0,
    unroll_type=UNROLL_NAIVE, start_label=0x1a65278, loop_end=0x1a65538,
    insert_before=0x1a65538, copy_notes_from=0x1a65538)
    at ../../gcc/unroll.c:1936
#5  0x18f25f4 in unroll_loop (loop_end=0x1a65538, insn_count=712,
    loop_start=0x1a652b8, end_insert_before=0x1a65550, strength_reduce_p=0)
    at ../../gcc/unroll.c:1239
#6  0x18eb34c in strength_reduce (scan_start=0x1a65278, end=0x1a65538,
    loop_top=0x0, insn_count=1, loop_start=0x1a652b8, loop_end=0x1a65538,
    unroll_p=1) at ../../gcc/loop.c:3628
#7  0x18e7200 in scan_loop (loop_start=0x1a652b8, end=0x1a65538, nregs=178,
    unroll_p=1) at ../../gcc/loop.c:1067
#8  0x18e6188 in loop_optimize (f=0x1a4e3c0, dumpfile=0x1a6bba8, unroll_p=1)
    at ../../gcc/loop.c:521
#9  0x1828b0c in rest_of_compilation (decl=0x1a622a8)
    at ../../gcc/toplev.c:3278
#10 0x181357c in finish_function (nested=0) at ../../gcc/c-decl.c:7110
#11 0x1802278 in yyparse () at c-parse.y:318
#12 0x1827690 in compile_file (name=0x0) at ../../gcc/toplev.c:2544
#13 0x182a8e0 in main (argc=13, argv=0x7ffffb14, envp=0x1a6bb30)
    at ../../gcc/toplev.c:4361
#14 0x1801494 in __start1 (argc=13, argv=0x7ffffb14, envp=0x7ffffb4c,
    auxvec=0x7ffffbc0, exitfn=0, stack_on_entry=0x1a30000)
    at ../sysdeps/powerpc/elf/start.c:124
(gdb) q