http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48908
Summary: [4.7 Regression]: build fails on cris-elf in
libiberty:md5.c, shift-related
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Keywords: build, ice-on-valid-code
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: h...@gcc.gnu.org
CC: rgue...@gcc.gnu.org
Host: x86_64-unknown-linux-gnu
Target: cris-axis-elf
Created attachment 24198
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24198
"cc1 -fpreprocessed md5.i -O2 -o md5.s" to repeat
A patch in the revision range (last_known_working:first_known_failing)
173419:173428 caused the build for cris-elf to fail as follows:
/tmp/hpautotest-gcc1/cris-elf/gccobj/./gcc/xgcc
-B/tmp/hpautotest-gcc1/cris-elf/gccobj/./gcc/ -nostdinc
-B/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/newlib/ -isystem
/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/newlib/targ-include -isystem
/tmp/hpautotest-gcc1/gcc/newlib/libc/include
-B/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/libgloss/cris
-L/tmp/hpautotest-gcc1/cris-elf/gccobj/cris-elf/libgloss/libnosys
-L/tmp/hpautotest-gcc1/gcc/libgloss/cris
-B/tmp/hpautotest-gcc1/cris-elf/pre/cris-elf/bin/
-B/tmp/hpautotest-gcc1/cris-elf/pre/cris-elf/lib/ -isystem
/tmp/hpautotest-gcc1/cris-elf/pre/cris-elf/include -isystem
/tmp/hpautotest-gcc1/cris-elf/pre/cris-elf/sys-include -c -DHAVE_CONFIG_H -g
-O2 -I. -I/tmp/hpautotest-gcc1/gcc/libiberty/../include -W -Wall
-Wwrite-strings -Wc++-compat -Wstrict-prototypes -pedantic
/tmp/hpautotest-gcc1/gcc/libiberty/md5.c -o md5.o
/tmp/hpautotest-gcc1/gcc/libiberty/md5.c: In function 'md5_finish_ctx':
/tmp/hpautotest-gcc1/gcc/libiberty/md5.c:113:3: warning: dereferencing
type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
/tmp/hpautotest-gcc1/gcc/libiberty/md5.c:114:3: warning: dereferencing
type-punned pointer will break strict-aliasing rules [-Wstrict-aliasing]
/tmp/hpautotest-gcc1/gcc/libiberty/md5.c: In function 'md5_process_block':
/tmp/hpautotest-gcc1/gcc/libiberty/md5.c:327:7: internal compiler error:
Segmentation fault
A gdb backtrace points at revision 173428:
(The revision below was 173446)
(gdb) r -fpreprocessed /n/slask/hp_tmp/md5.i -O2 -o md5.s
Starting program: /tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/cc1 -fpreprocessed
/n/slask/hp_tmp/md5.i -O2 -o md5.s
md5_process_block
Analyzing compilation unit
Performing interprocedural optimizations
<*free_lang_data> <visibility> <early_local_cleanups> <emutls> <whole-program>
<ipa-profile> <cp> <inline> <pure-const> <static-var>Assembling functions:
md5_process_block
Program received signal SIGSEGV, Segmentation fault.
0x00000000006c3595 in copy_to_mode_reg (mode=SImode, x=0x0) at
/tmp/hpautotest-gcc1/gcc/gcc/explow.c:635
635 gcc_assert (GET_MODE (x) == mode || GET_MODE (x) == VOIDmode);
Missing separate debuginfos, use: debuginfo-install glibc-2.11.1-1.x86_64
(gdb) p x
$1 = (rtx) 0x0
(gdb) bt
#0 0x00000000006c3595 in copy_to_mode_reg (mode=SImode, x=0x0) at
/tmp/hpautotest-gcc1/gcc/gcc/explow.c:635
#1 0x0000000000929f18 in maybe_legitimize_operand (icode=CODE_FOR_lshrsi3,
opno=2, op=0x7fffffffcb60)
at /tmp/hpautotest-gcc1/gcc/gcc/optabs.c:7077
#2 0x000000000092a227 in maybe_legitimize_operands (icode=CODE_FOR_lshrsi3,
opno=0, nops=3, ops=0x7fffffffcb40)
at /tmp/hpautotest-gcc1/gcc/gcc/optabs.c:7139
#3 0x000000000092a2b1 in maybe_gen_insn (icode=CODE_FOR_lshrsi3, nops=3,
ops=0x7fffffffcb40)
at /tmp/hpautotest-gcc1/gcc/gcc/optabs.c:7157
#4 0x000000000091b792 in expand_binop_directly (mode=SImode,
binoptab=0x13b7cb8, op0=0x7ffff7cb3ce0,
op1=0x7ffff7eb1e10, target=0x7ffff7cb3d00, unsignedp=1,
methods=OPTAB_DIRECT, last=0x7ffff7e0eee8)
at /tmp/hpautotest-gcc1/gcc/gcc/optabs.c:1328
#5 0x000000000091b9c2 in expand_binop (mode=SImode, binoptab=0x13b7cb8,
op0=0x7ffff7cb3ce0, op1=0x7ffff7eb1e10,
target=0x7ffff7cb3d00, unsignedp=1, methods=OPTAB_DIRECT) at
/tmp/hpautotest-gcc1/gcc/gcc/optabs.c:1394
#6 0x00000000006ca8f0 in expand_shift_1 (code=RSHIFT_EXPR, mode=SImode,
shifted=0x7ffff7cb3ce0,
amount=0x7ffff7eb1e10, target=0x7ffff7cb3d00, unsignedp=1) at
/tmp/hpautotest-gcc1/gcc/gcc/expmed.c:2166
#7 0x00000000006ca80f in expand_shift_1 (code=LROTATE_EXPR, mode=SImode,
shifted=0x7ffff7cb3ce0,
amount=0x7ffff7eca4e0, target=0x7ffff7cb3d00, unsignedp=1) at
/tmp/hpautotest-gcc1/gcc/gcc/expmed.c:2154
#8 0x00000000006caa77 in expand_variable_shift (code=LROTATE_EXPR,
mode=SImode, shifted=0x7ffff7cb3ce0,
amount=0x7ffff7f95640, target=0x7ffff7cb3d00, unsignedp=1) at
/tmp/hpautotest-gcc1/gcc/gcc/expmed.c:2226
#9 0x00000000006fb2c7 in expand_expr_real_2 (ops=0x7fffffffd860,
target=0x7ffff7cb3d00, tmode=SImode,
modifier=EXPAND_NORMAL) at /tmp/hpautotest-gcc1/gcc/gcc/expr.c:8062
#10 0x00000000005ec099 in expand_gimple_stmt_1 (stmt=0x7ffff7fbf5d8) at
/tmp/hpautotest-gcc1/gcc/gcc/cfgexpand.c:1989
#11 0x00000000005ec301 in expand_gimple_stmt (stmt=0x7ffff7fbf5d8) at
/tmp/hpautotest-gcc1/gcc/gcc/cfgexpand.c:2050
#12 0x00000000005f51ad in expand_gimple_basic_block (bb=0x7ffff7f93a28)
at /tmp/hpautotest-gcc1/gcc/gcc/cfgexpand.c:3619
#13 0x00000000005f6ee0 in gimple_expand_cfg () at
/tmp/hpautotest-gcc1/gcc/gcc/cfgexpand.c:4102
#14 0x000000000093c717 in execute_one_pass (pass=0x138e8e0) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:1556
#15 0x000000000093c906 in execute_pass_list (pass=0x138e8e0) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:1611
#16 0x0000000000ab11c8 in tree_rest_of_compilation (fndecl=0x7ffff7f97500)
at /tmp/hpautotest-gcc1/gcc/gcc/tree-optimize.c:417
#17 0x0000000000d3e6cf in cgraph_expand_function (node=0x7ffff7fc0000)
at /tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1579
#18 0x0000000000d3e88e in cgraph_expand_all_functions () at
/tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1638
#19 0x0000000000d3ef1b in cgraph_optimize () at
/tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1901
#20 0x0000000000d3c2c5 in cgraph_finalize_compilation_unit () at
/tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1099
#21 0x000000000049240d in c_write_global_declarations () at
/tmp/hpautotest-gcc1/gcc/gcc/c-decl.c:9846
#22 0x0000000000a1404c in compile_file () at
/tmp/hpautotest-gcc1/gcc/gcc/toplev.c:586
#23 0x0000000000a161a8 in do_compile () at
/tmp/hpautotest-gcc1/gcc/gcc/toplev.c:1928
#24 0x0000000000a16315 in toplev_main (argc=6, argv=0x7fffffffe128) at
/tmp/hpautotest-gcc1/gcc/gcc/toplev.c:2000
#25 0x0000000000556460 in main (argc=6, argv=0x7fffffffe128) at
/tmp/hpautotest-gcc1/gcc/gcc/main.c:36
(gdb) up
#1 0x0000000000929f18 in maybe_legitimize_operand (icode=CODE_FOR_lshrsi3,
opno=2, op=0x7fffffffcb60)
at /tmp/hpautotest-gcc1/gcc/gcc/optabs.c:7077
7077 op->value = copy_to_mode_reg (mode, op->value);
(gdb) p *op
$1 = {type = EXPAND_INPUT, unsigned_p = 0, unused = 0, mode = SImode, value =
0x7ffff7eb1e10}
(gdb) p op->value
$2 = (rtx) 0x7ffff7eb1e10
(gdb) pr
(minus (const_int 32 [0x20])
(const_int 7 [0x7]))
(gdb)
Author of the most suspect patch in revision range CC:ed.
See also the preprocessed test-case.
