[Bug target/32264] gcc 4.2.0 compiled vanilla kernel 2.4.34.5 crashes when VIA C3 optimized -march=c3

[pluto at agmk dot net]

------- Comment #12 from pluto at agmk dot net  2007-08-02 13:29 -------
(In reply to comment #11)
> Created an attachment (id=14004)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=14004&action=view) [edit]

my gcc-4.2.1 (which is almost like FSF release) produces for attached
preprocessed file reasonable code that contains interrupt routines.

$ gcc -m32 -O2 -march=c3 -fno-strict-aliasing --save-temps -c i8259.i
$ nm i8259.o |grep inter
00000020 t IRQ0x00_interrupt
00000030 t IRQ0x01_interrupt
00000040 t IRQ0x02_interrupt
00000050 t IRQ0x03_interrupt
00000060 t IRQ0x04_interrupt
00000070 t IRQ0x05_interrupt
00000080 t IRQ0x06_interrupt
00000090 t IRQ0x07_interrupt
000000a0 t IRQ0x08_interrupt
000000b0 t IRQ0x09_interrupt
000000c0 t IRQ0x0a_interrupt
000000d0 t IRQ0x0b_interrupt
000000e0 t IRQ0x0c_interrupt
000000f0 t IRQ0x0d_interrupt
00000100 t IRQ0x0e_interrupt
00000110 t IRQ0x0f_interrupt
00000000 t common_interrupt
00000000 D interrupt

the 4.2 object from the first attachment hasn't interrupt code
located in the .text section. it has only .bss entries and this
is a reason of the crash-on-first-interrupt.

$ nm i8259.o_gcc42 |grep inter
00000030 b IRQ0x00_interrupt
00000040 b IRQ0x01_interrupt
00000050 b IRQ0x02_interrupt
00000060 b IRQ0x03_interrupt
00000070 b IRQ0x04_interrupt
00000080 b IRQ0x05_interrupt
00000090 b IRQ0x06_interrupt
000000a0 b IRQ0x07_interrupt
000000b0 b IRQ0x08_interrupt
000000c0 b IRQ0x09_interrupt
000000d0 b IRQ0x0a_interrupt
000000e0 b IRQ0x0b_interrupt
000000f0 b IRQ0x0c_interrupt
00000100 b IRQ0x0d_interrupt
00000110 b IRQ0x0e_interrupt
00000120 b IRQ0x0f_interrupt
00000010 b common_interrupt
00000000 D interrupt


btw, the 4.3 snapshot ICEs on this code ;)

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x0000000000a4a85c in cpp_interpret_string (pfile=0xf5bd40, from=<value
optimized out>, count=1, to=0x7fff77f942f0, wide=0 '\0')
    at ../../libcpp/charset.c:1334
#2  0x0000000000a4b120 in cpp_interpret_string_notranslate
(pfile=0xffffffffffffffff, from=0xf5f8c3, count=7, to=0x7fff77f94270,
    wide=3 '\003') at ../../libcpp/charset.c:1369
#3  0x0000000000a4e408 in do_linemarker (pfile=0xf5bd40) at
../../libcpp/directives.c:924
#4  0x0000000000a4d36d in _cpp_handle_directive (pfile=0xf5bd40, indented=0) at
../../libcpp/directives.c:468
#5  0x0000000000a53963 in cpp_read_main_file (pfile=0xf5bd40, fname=<value
optimized out>) at ../../libcpp/init.c:518
#6  0x00000000004616c1 in c_common_post_options (pfilename=0xf2a090) at
../../gcc/c-opts.c:1190
#7  0x0000000000689f00 in toplev_main (argc=12, argv=0x7fff77f94508) at
../../gcc/toplev.c:1693
#8  0x00000000004851b9 in main (argc=-1, argv=0xf5f8c3) at ../../gcc/main.c:35


-- 

pluto at agmk dot net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pluto at agmk dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32264