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[Bug ipa/65076] [5 Regression] 16% tramp3d-v4.cpp compile time regression
- From: "trippels at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 16 Feb 2015 19:15:37 +0000
- Subject: [Bug ipa/65076] [5 Regression] 16% tramp3d-v4.cpp compile time regression
- Auto-submitted: auto-generated
- References: <bug-65076-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65076
--- Comment #5 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Perf shows:
Overhead Command Shared Object Symbol
2.45% cc1plus libc-2.21.90.so [.] _int_malloc
1.88% cc1plus cc1plus [.] bitmap_find_bit
1.72% cc1plus cc1plus [.] gt_ggc_mx_lang_tree_node
1.36% cc1plus libc-2.21.90.so [.] _int_free
1.05% cc1plus cc1plus [.] ggc_set_mark
0.97% cc1plus cc1plus [.] record_reg_classes
0.96% cc1plus cc1plus [.] df_worklist_dataflow
0.91% cc1plus cc1plus [.] build_qualified_type
0.88% cc1plus cc1plus [.] df_note_compute
0.84% cc1plus libc-2.21.90.so [.] malloc_consolidate
(Using a faster malloc implementation speeds up compile time by ~5%:
markus@x4 ~ % time g++ -w -Ofast tramp3d-v4.cpp
g++ -w -Ofast tramp3d-v4.cpp 26.00s user 0.32s system 99% cpu 26.341 total
markus@x4 ~ % time LD_PRELOAD=/usr/lib/libllalloc.so.1.3 g++ -w -Ofast
tramp3d-v4.cpp
LD_PRELOAD=/usr/lib/libllalloc.so.1.3 g++ -w -Ofast tramp3d-v4.cpp 24.60s user
0.37s system 99% cpu 24.997 total)