[Bug middle-end/53865] [4.8 Regression] 176.gcc in SPEC CPU 2000 failed to build with LTO

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53865

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2012-07-05 17:21:09 UTC ---
Created attachment 27747
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27747
A testcase

(gdb) r -quiet -dumpdir ./ -dumpbase cc1.ltrans6 -mfpmath=sse -mtune=generic
-march=x86-64 -m32 -msse2 -mfpmath=sse -mtune=generic -march=x86-64
-auxbase-strip cc1.ltrans6.ltrans.o -O3 -version -funroll-loops -ffast-math
-fwhole-program -fuse-linker-plugin -fltrans cc1.ltrans6.o -o cc1.ltrans6.s
Starting program: /export/build/gnu/gcc/build-x86_64-linux/gcc/lto1 -quiet
-dumpdir ./ -dumpbase cc1.ltrans6 -mfpmath=sse -mtune=generic -march=x86-64
-m32 -msse2 -mfpmath=sse -mtune=generic -march=x86-64 -auxbase-strip
cc1.ltrans6.ltrans.o -O3 -version -funroll-loops -ffast-math -fwhole-program
-fuse-linker-plugin -fltrans cc1.ltrans6.o -o cc1.ltrans6.s
GNU GIMPLE (GCC) version 4.8.0 20120705 (experimental)
(x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.6.3 20120306 (Red Hat 4.6.3-2), GMP version
4.3.2, MPFR version 3.0.1, MPC version 0.8.3-dev
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU GIMPLE (GCC) version 4.8.0 20120705 (experimental)
(x86_64-unknown-linux-gnu)
    compiled by GNU C version 4.6.3 20120306 (Red Hat 4.6.3-2), GMP version
4.3.2, MPFR version 3.0.1, MPC version 0.8.3-dev
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096

Program received signal SIGABRT, Aborted.
0x00000035a6a352f5 in raise () from /lib64/libc.so.6
(gdb) bt
#0  0x00000035a6a352f5 in raise () from /lib64/libc.so.6
#1  0x00000035a6a36c0b in abort () from /lib64/libc.so.6
#2  0x000000000119cd71 in htab_clear_slot (htab=0x7ffff1b948c0, slot=0x0)
    at /export/gnu/import/git/gcc/libiberty/hashtab.c:756
#3  0x0000000000a4c576 in remove_referenced_var (var=0x7ffff0fbb3c0)
    at /export/gnu/import/git/gcc/gcc/tree-dfa.c:605
#4  0x0000000000b785f1 in remove_unused_locals ()
    at /export/gnu/import/git/gcc/gcc/tree-ssa-live.c:834
#5  0x000000000090e13e in execute_function_todo (data=0x208a24)
    at /export/gnu/import/git/gcc/gcc/passes.c:1793
#6  0x000000000090dbcb in do_per_function (
    callback=0x90e034 <execute_function_todo>, data=0x208a24)
    at /export/gnu/import/git/gcc/gcc/passes.c:1646
#7  0x000000000090e2a8 in execute_todo (flags=2132516)
    at /export/gnu/import/git/gcc/gcc/passes.c:1842
#8  0x000000000090e6f1 in execute_one_ipa_transform_pass (node=0x7ffff15e7ea0, 
    ipa_pass=0x17ba300) at /export/gnu/import/git/gcc/gcc/passes.c:2020
#9  0x000000000090e7a1 in execute_all_ipa_transforms ()
    at /export/gnu/import/git/gcc/gcc/passes.c:2045
#10 0x00000000005826ae in expand_function (node=0x7ffff15e7ea0)
    at /export/gnu/import/git/gcc/gcc/cgraphunit.c:1608
#11 0x0000000000582d98 in expand_all_functions ()
    at /export/gnu/import/git/gcc/gcc/cgraphunit.c:1720
---Type <return> to continue, or q <return> to quit---
#12 0x00000000005838b0 in compile ()
    at /export/gnu/import/git/gcc/gcc/cgraphunit.c:2018
#13 0x00000000004b9d43 in lto_main ()
    at /export/gnu/import/git/gcc/gcc/lto/lto.c:2120
#14 0x0000000000a033db in compile_file ()
    at /export/gnu/import/git/gcc/gcc/toplev.c:550
#15 0x0000000000a05370 in do_compile ()
    at /export/gnu/import/git/gcc/gcc/toplev.c:1867
#16 0x0000000000a054e0 in toplev_main (argc=26, argv=0x7fffffffe1b8)
    at /export/gnu/import/git/gcc/gcc/toplev.c:1943
#17 0x0000000001133bcc in main (argc=26, argv=0x7fffffffe1b8)
    at /export/gnu/import/git/gcc/gcc/main.c:36
(gdb) f 3
#3  0x0000000000a4c576 in remove_referenced_var (var=0x7ffff0fbb3c0)
    at /export/gnu/import/git/gcc/gcc/tree-dfa.c:605
605      htab_clear_slot (gimple_referenced_vars (cfun), loc);
(gdb) p loc
$1 = (void **) 0x0
(gdb)