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gzip: Improve ptr_to_globals trick, allowing gcc

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to optimize better. -480 bytes.
This commit is contained in:
Denis Vlasenko 2007-03-15 19:48:35 +00:00
parent 1cc70225e7
commit bff32ce4d5
3 changed files with 8 additions and 4 deletions
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4
archival/gzip.c
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@ -2045,8 +2045,8 @@ int gzip_main(int argc, char **argv)
}
#endif
ptr_to_globals = xzalloc(sizeof(struct globals) + sizeof(struct globals2));
ptr_to_globals++;
PTR_TO_GLOBALS = xzalloc(sizeof(struct globals) + sizeof(struct globals2))
+ sizeof(struct globals);
G2.l_desc.dyn_tree = G2.dyn_ltree;
G2.l_desc.static_tree = G2.static_ltree;
G2.l_desc.extra_bits = extra_lbits;

5
include/libbb.h
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@ -804,7 +804,10 @@ extern char bb_common_bufsiz1[BUFSIZ+1];
/* This struct is deliberately not defined. */
/* See docs/keep_data_small.txt */
struct globals;
extern struct globals *ptr_to_globals;
/* Magic prevents this from going into rodata */
/* If you want to assign a value, use PTR_TO_GLOBALS = xxx */
extern struct globals *const ptr_to_globals;
#define PTR_TO_GLOBALS (*(struct globals**)&ptr_to_globals)
/* You can change LIBBB_DEFAULT_LOGIN_SHELL, but don't use it,
* use bb_default_login_shell and following defines.

3
libbb/messages.c
View File

@ -57,4 +57,5 @@ WTMP_FILE;
char bb_common_bufsiz1[BUFSIZ+1];
struct globals;
struct globals *ptr_to_globals;
/* Make it reside in R/W memory: */
struct globals *const ptr_to_globals __attribute__ ((section (".data")));