[Bug lto/41159] [LTO] ICE in insert_value_copy_on_edge, at tree-outof-ssa.c:225

[ubizjak at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41159

--- Comment #17 from Uros Bizjak <ubizjak at gmail dot com> 2011-12-15 14:01:56 UTC ---
(In reply to comment #16)
> It's tedious to look at this without a testcase that triggers on native
> x86_64.  My usual simple crosses do not work with LTO as I need a target
> assembler and linker.
> 
> So - someone with access to an affected target please debug this.

I have managed to trigger this bug on x86_64-linux-gnu cross to
alpha-linux-gnu.

Please follow these steps:

1) compile and install binutils for alpha-linux-gnu.
2) configure crosscompiler with:
~/gcc-svn/trunk/configure --target=alpha-linux-gnu --enable-languages=c
3) make (and wait until the compilation crashes)

4) Go into gcc/testsuite/gcc.dg/lto directory

5) ~/gcc-build-alpha/gcc/xgcc -B ~/gcc-build-alpha/gcc -O1 -flto
-flto-partition=1to1 -fPIC  -c -o c_lto_20090116_0.o 20090116_0.c

6) ~/gcc-build-alpha/gcc/lto1 c_lto_20090116_0.o

In file included from :0:0:
20090116_0.c: In function ‘foo’:
20090116_0.c:6:5: internal compiler error: in insert_value_copy_on_edge, at
tree-outof-ssa.c:242
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /home/uros/gcc-build-alpha/gcc/xgcc returned 1 exit status
collect2: error: lto-wrapper returned 1 exit status

7) gdb --args ~/gcc-build-alpha/gcc/lto1 c_lto_20090116_0.o

(gdb) break fancy_abort 
Breakpoint 1 at 0xadc540: file /home/uros/gcc-svn/trunk/gcc/diagnostic.c, line
898.
(gdb) r
Starting program: /home/uros/gcc-build-alpha/gcc/lto1 -O0 c_lto_20090116_0.o
warning: no loadable sections found in added symbol-file system-supplied DSO at
0x2aaaaaaab000
Reading object files: c_lto_20090116_0.o
Reading the callgraph
Merging declarations
Reading summaries
Reading function bodies: foo
Performing interprocedural optimizations
 <whole-program>Assembling functions:
 foo
Breakpoint 1, fancy_abort (file=0xb92430
"/home/uros/gcc-svn/trunk/gcc/tree-outof-ssa.c", line=242, 
    function=0xb92920 "insert_value_copy_on_edge") at
/home/uros/gcc-svn/trunk/gcc/diagnostic.c:898
898     {
(gdb) bt
#0  fancy_abort (file=0xb92430 "/home/uros/gcc-svn/trunk/gcc/tree-outof-ssa.c",
line=242, 
    function=0xb92920 "insert_value_copy_on_edge") at
/home/uros/gcc-svn/trunk/gcc/diagnostic.c:898
#1  0x000000000081c3ab in insert_value_copy_on_edge (e=<value optimized out>,
g=0xf94080)
    at /home/uros/gcc-svn/trunk/gcc/tree-outof-ssa.c:242
#2  eliminate_phi (e=<value optimized out>, g=0xf94080) at
/home/uros/gcc-svn/trunk/gcc/tree-outof-ssa.c:705
#3  0x000000000081c7e2 in expand_phi_nodes (sa=<value optimized out>)
    at /home/uros/gcc-svn/trunk/gcc/tree-outof-ssa.c:867
#4  0x00000000004d73f4 in gimple_expand_cfg () at
/home/uros/gcc-svn/trunk/gcc/cfgexpand.c:4518
#5  0x0000000000707459 in execute_one_pass (pass=0xeae160) at
/home/uros/gcc-svn/trunk/gcc/passes.c:2079
#6  0x00000000007077c5 in execute_pass_list (pass=0xeae160) at
/home/uros/gcc-svn/trunk/gcc/passes.c:2134
#7  0x00000000008191c8 in tree_rest_of_compilation (fndecl=0x2aaaae82d800)
    at /home/uros/gcc-svn/trunk/gcc/tree-optimize.c:421
#8  0x00000000004f51ba in cgraph_expand_function (node=0x2aaaae832000)
    at /home/uros/gcc-svn/trunk/gcc/cgraphunit.c:1818
#9  0x00000000004f8b6b in cgraph_output_in_order () at
/home/uros/gcc-svn/trunk/gcc/cgraphunit.c:1983
#10 cgraph_optimize () at /home/uros/gcc-svn/trunk/gcc/cgraphunit.c:2193
#11 0x000000000047f4e9 in lto_main () at
/home/uros/gcc-svn/trunk/gcc/lto/lto.c:2931
#12 0x00000000007a99ec in compile_file (argc=3, argv=0x7fffffffb8e8)
    at /home/uros/gcc-svn/trunk/gcc/toplev.c:557
#13 do_compile (argc=3, argv=0x7fffffffb8e8) at
/home/uros/gcc-svn/trunk/gcc/toplev.c:1928
#14 toplev_main (argc=3, argv=0x7fffffffb8e8) at
/home/uros/gcc-svn/trunk/gcc/toplev.c:2004
#15 0x0000003f90c1d994 in __libc_start_main () from /lib64/libc.so.6
#16 0x000000000045dee9 in _start ()

I will also attach c_lto_20090116_0.o.