diff options
| author | Kirill Smelkov <kirr@navytux.spb.ru> | 2012-12-21 12:21:59 +0400 |
|---|---|---|
| committer | Kirill Smelkov <kirr@navytux.spb.ru> | 2012-12-21 20:46:26 +0400 |
| commit | 8eb92e605200b1fe8d570ad309e28245c3f1af0a (patch) | |
| tree | 06e451e132f7f8b6d6c307deb3d745afa1580426 /win32/include/malloc.h | |
| parent | e79281f58ec302e8cc9dfc7d00e06f426fcd2acd (diff) | |
| download | tinycc-8eb92e605200b1fe8d570ad309e28245c3f1af0a.tar.gz tinycc-8eb92e605200b1fe8d570ad309e28245c3f1af0a.tar.bz2 | |
Optimize cstr_reset() to only reset string to empty, not call free() and later malloc()
A CString could be reset to empty just setting its .size to 0.
If memory was already allocated, that would be remembered in
.data_allocated and .size_allocated and on consequent string
manipulations that memory will be used without immediate need to call
malloc().
For
$ ./tcc -B. -bench -DONE_SOURCE -DCONFIG_MULTIARCHDIR=\"i386-linux-gnu\" -c tcc.c
after the patch malloc/free are called less often:
(tcc is run in loop; perf record -a sleep 10 && perf report)
before:
# Overhead Command Shared Object Symbol
# ........ ........... .................. ..........................................
#
13.89% tcc tcc [.] next_nomacro1
4.73% tcc libc-2.13.so [.] _int_malloc
4.39% tcc tcc [.] next
2.94% tcc tcc [.] tok_str_add2
2.78% tcc tcc [.] macro_subst_tok
2.75% tcc libc-2.13.so [.] free
2.74% tcc tcc [.] macro_subst
2.63% tcc libc-2.13.so [.] _int_free
2.28% tcc tcc [.] vswap
2.24% tcc tcc [.] next_nomacro_spc
2.06% tcc libc-2.13.so [.] realloc
2.00% tcc libc-2.13.so [.] malloc
1.99% tcc tcc [.] unary
1.85% tcc libc-2.13.so [.] __i686.get_pc_thunk.bx
1.76% kworker/0:1 [kernel.kallsyms] [k] delay_tsc
1.70% tcc tcc [.] next_nomacro
1.62% tcc tcc [.] preprocess
1.41% tcc libc-2.13.so [.] __memcmp_ssse3
1.38% tcc [kernel.kallsyms] [k] memset
1.10% tcc tcc [.] g
1.06% tcc tcc [.] parse_btype
1.05% tcc tcc [.] sym_push2
1.04% tcc libc-2.13.so [.] _int_realloc
1.00% tcc libc-2.13.so [.] malloc_consolidate
after:
# Overhead Command Shared Object Symbol
# ........ ........... .................. ..............................................
#
15.26% tcc tcc [.] next_nomacro1
5.07% tcc libc-2.13.so [.] _int_malloc
4.62% tcc tcc [.] next
3.22% tcc tcc [.] tok_str_add2
3.03% tcc tcc [.] macro_subst_tok
3.02% tcc tcc [.] macro_subst
2.59% tcc tcc [.] next_nomacro_spc
2.44% tcc tcc [.] vswap
2.39% tcc libc-2.13.so [.] _int_free
2.28% tcc libc-2.13.so [.] free
2.22% tcc tcc [.] unary
2.07% tcc libc-2.13.so [.] realloc
1.97% tcc libc-2.13.so [.] malloc
1.70% tcc tcc [.] preprocess
1.69% tcc libc-2.13.so [.] __i686.get_pc_thunk.bx
1.68% tcc tcc [.] next_nomacro
1.59% tcc [kernel.kallsyms] [k] memset
1.55% tcc libc-2.13.so [.] __memcmp_ssse3
1.22% tcc tcc [.] parse_comment
1.11% tcc tcc [.] g
1.11% tcc tcc [.] sym_push2
1.10% tcc tcc [.] parse_btype
1.10% tcc libc-2.13.so [.] _int_realloc
1.06% tcc tcc [.] vsetc
0.98% tcc libc-2.13.so [.] malloc_consolidate
and this gains small speedup for tcc:
# best of 5 runs
before: 8268 idents, 47191 lines, 1526670 bytes, 0.153 s, 307997 lines/s, 10.0 MB/s
after: 8268 idents, 47203 lines, 1526763 bytes, 0.148 s, 319217 lines/s, 10.3 MB/s
Diffstat (limited to 'win32/include/malloc.h')
0 files changed, 0 insertions, 0 deletions