http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49721
--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> 2011-08-02 19:17:43
UTC ---
Here is the problem:
(gdb)
Continuing.
Breakpoint 1, convert_memory_address_addr_space (to_mode=DImode,
x=0x7ffff07f73c0, as=0 '\000')
at /export/gnu/import/git/gcc/gcc/explow.c:409
409 return convert_modes (to_mode, from_mode,
(plus:SI (symbol_ref:SI ("iplane.1553") [flags 0x2] <var_decl 0x7ffff08593c0
iplane>)
(const_int -4 [0xfffffffffffffffc]))
(gdb) bt
#0 convert_memory_address_addr_space (to_mode=DImode, x=0x7ffff07f73c0,
as=0 '\000') at /export/gnu/import/git/gcc/gcc/explow.c:409
#1 0x0000000000789f95 in convert_memory_address_addr_space (to_mode=DImode,
x=0x7ffff07f1c70, as=0 '\000')
at /export/gnu/import/git/gcc/gcc/explow.c:380
#2 0x0000000000b12b4f in simplify_unary_operation_1 (code=ZERO_EXTEND,
mode=DImode, op=0x7ffff07f1c70)
at /export/gnu/import/git/gcc/gcc/simplify-rtx.c:1246
#3 0x0000000000b108ae in simplify_unary_operation (code=ZERO_EXTEND,
mode=DImode, op=0x7ffff07f1c70, op_mode=SImode)
at /export/gnu/import/git/gcc/gcc/simplify-rtx.c:582
#4 0x0000000000b10092 in simplify_gen_unary (code=ZERO_EXTEND, mode=DImode,
op=0x7ffff07f1c70, op_mode=SImode)
at /export/gnu/import/git/gcc/gcc/simplify-rtx.c:370
#5 0x000000000116cb9a in if_then_else_cond (x=0x7ffff07beb40,
ptrue=0x7fffffffd370, pfalse=0x7fffffffd368)
at /export/gnu/import/git/gcc/gcc/combine.c:8650
#6 0x00000000011639b0 in combine_simplify_rtx (x=0x7ffff07beb40,
op0_mode=SImode, in_dest=0, in_cond=0)
at /export/gnu/import/git/gcc/gcc/combine.c:5316
#7 0x0000000001163710 in subst (x=0x7ffff07beb40, from=0x7ffff07c5ac0,
to=0x7ffff07f73d8, in_dest=0, in_cond=0, unique_copy=0)
at /export/gnu/import/git/gcc/gcc/combine.c:5253
---Type <return> to continue, or q <return> to quit---
#8 0x00000000011634ff in subst (x=0x7ffff07ca990, from=0x7ffff07c5ac0,
to=0x7ffff07f73d8, in_dest=0, in_cond=0, unique_copy=0)
at /export/gnu/import/git/gcc/gcc/combine.c:5189
#9 0x000000000115d5d6 in try_combine (i3=0x7ffff07cb708, i2=0x7ffff07cb6c0,
i1=0x0, i0=0x0, new_direct_jump_p=0x7fffffffda64,
last_combined_insn=0x7ffff07cb708)
at /export/gnu/import/git/gcc/gcc/combine.c:3178
#10 0x00000000011588af in combine_instructions (f=0x7ffff07ab880, nregs=487)
at /export/gnu/import/git/gcc/gcc/combine.c:1223
#11 0x0000000001178a5e in rest_of_handle_combine ()
at /export/gnu/import/git/gcc/gcc/combine.c:13880
#12 0x0000000000a5384c in execute_one_pass (pass=0x190e600)
at /export/gnu/import/git/gcc/gcc/passes.c:2063
#13 0x0000000000a53a32 in execute_pass_list (pass=0x190e600)
at /export/gnu/import/git/gcc/gcc/passes.c:2118
#14 0x0000000000a53a53 in execute_pass_list (pass=0x1909260)
at /export/gnu/import/git/gcc/gcc/passes.c:2119
#15 0x0000000000bec908 in tree_rest_of_compilation (fndecl=0x7ffff0945b00)
at /export/gnu/import/git/gcc/gcc/tree-optimize.c:416
#16 0x00000000006d4d95 in cgraph_expand_function (node=0x7ffff074a900)
at /export/gnu/import/git/gcc/gcc/cgraphunit.c:1803
#17 0x00000000006d4f54 in cgraph_expand_all_functions ()
at /export/gnu/import/git/gcc/gcc/cgraphunit.c:1862
---Type <return> to continue, or q <return> to quit---
#18 0x00000000006d5650 in cgraph_optimize ()
at /export/gnu/import/git/gcc/gcc/cgraphunit.c:2132
#19 0x00000000006d2acd in cgraph_finalize_compilation_unit ()
at /export/gnu/import/git/gcc/gcc/cgraphunit.c:1310
#20 0x00000000009cf010 in write_global_declarations ()
at /export/gnu/import/git/gcc/gcc/langhooks.c:303
#21 0x0000000000559ed0 in gfc_write_global_declarations ()
at /export/gnu/import/git/gcc/gcc/fortran/f95-lang.c:322
#22 0x0000000000b49830 in compile_file ()
at /export/gnu/import/git/gcc/gcc/toplev.c:564
#23 0x0000000000b4ba1a in do_compile ()
at /export/gnu/import/git/gcc/gcc/toplev.c:1886
#24 0x0000000000b4bb8a in toplev_main (argc=19, argv=0x7fffffffdef8)
at /export/gnu/import/git/gcc/gcc/toplev.c:1962
#25 0x000000000060d9ac in main (argc=19, argv=0x7fffffffdef8)
at /export/gnu/import/git/gcc/gcc/main.c:36
(gdb)
In combine, we can't generate any new insns. But we do generate
new insns in this case.
