On Linux/ia32, revision 162656 went into infinite loop during
bootstrap:
11445 hjl 20 0 57792 13m 9724 R 100.1 0.2 278:42.87 cc1
11509 hjl 20 0 60884 21m 13m R 100.1 0.3 278:40.99 cc1
11527 hjl 20 0 63292 23m 13m R 100.1 0.3 278:32.08 cc1
11939 hjl 20 0 59564 15m 10m R 99.7 0.2 277:24.65 cc1
when building libgcc:
(gdb) bt
#0 0x08d517b5 in memory_address_addr_space_p (mode=QImode, addr=0xf755ba50,
as=0 '\000') at ../../src-trunk/gcc/recog.c:1287
#1 0x096ba93a in get_address_cost (symbol_present=0 '\000',
var_present=1 '\001', offset=1, ratio=1, cstep=1, mem_mode=QImode,
as=0 '\000', speed=1 '\001', stmt_after_inc=0 '\000',
may_autoinc=0xffdcd25b "\377")
at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:3261
#2 0x096be013 in get_computation_cost_at (data=0xffdcd338, use=0xb2eac30,
cand=0xb2c0ca0, address_p=1 '\001', depends_on=0xffdcd25c, at=0xf755ca20,
can_autoinc=0xffdcd25b "\377", inv_expr_id=0xffdcd254)
at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:4083
#3 0x096be480 in get_computation_cost (data=0xffdcd338, use=0xb2eac30,
cand=0xb2c0ca0, address_p=1 '\001', depends_on=0xffdcd25c,
can_autoinc=0xffdcd25b "\377", inv_expr_id=0xffdcd254)
at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:4148
#4 0x096be5e3 in determine_use_iv_cost_address (data=0xffdcd338,
use=0xb2eac30, cand=0xb2c0ca0)
at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:4194
#5 0x096bf0ad in determine_use_iv_cost (data=0xffdcd338, use=0xb2eac30,
cand=0xb2c0ca0) at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:4470
#6 0x096bf378 in determine_use_iv_costs (data=0xffdcd338)
at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:4573
#7 0x096c4160 in tree_ssa_iv_optimize_loop (data=0xffdcd338, loop=0xf7544ec8)
---Type <return> to continue, or q <return> to quit---
at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:6385
#8 0x096c424f in tree_ssa_iv_optimize ()
at ../../src-trunk/gcc/tree-ssa-loop-ivopts.c:6432
#9 0x0974c79d in tree_ssa_loop_ivopts ()
at ../../src-trunk/gcc/tree-ssa-loop.c:634
#10 0x08c6b1d8 in execute_one_pass (pass=0xabd9820)
at ../../src-trunk/gcc/passes.c:1564
#11 0x08c6b3ac in execute_pass_list (pass=0xabd9820)
at ../../src-trunk/gcc/passes.c:1619
#12 0x08c6b3c8 in execute_pass_list (pass=0xabd9420)
at ../../src-trunk/gcc/passes.c:1620
#13 0x08c6b3c8 in execute_pass_list (pass=0xabd8da0)
at ../../src-trunk/gcc/passes.c:1620
#14 0x092e475b in tree_rest_of_compilation (fndecl=0xf752a800)
at ../../src-trunk/gcc/tree-optimize.c:452
#15 0x09d7985b in cgraph_expand_function (node=0xf7537e8c)
at ../../src-trunk/gcc/cgraphunit.c:1643
#16 0x09d79ac6 in cgraph_expand_all_functions ()
at ../../src-trunk/gcc/cgraphunit.c:1722
#17 0x09d7a0b8 in cgraph_optimize () at ../../src-trunk/gcc/cgraphunit.c:1978
#18 0x09d77e02 in cgraph_finalize_compilation_unit ()
at ../../src-trunk/gcc/cgraphunit.c:1185
#19 0x081116af in c_write_global_declarations ()
---Type <return> to continue, or q <return> to quit---
at ../../src-trunk/gcc/c-decl.c:9698
#20 0x08fe14db in compile_file () at ../../src-trunk/gcc/toplev.c:957
#21 0x08fe3483 in do_compile () at ../../src-trunk/gcc/toplev.c:2295
#22 0x08fe3549 in toplev_main (argc=63, argv=0xffdcd724)
at ../../src-trunk/gcc/toplev.c:2336
#23 0x082e040e in main (argc=63, argv=0xffdcd724)
at ../../src-trunk/gcc/main.c:36
(gdb)
Revision 162645 is OK.
--
Summary: [4.6 Regression] Bootstrap went to infinite loop
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: bootstrap
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hjl dot tools at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45119
