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expand comment about FAST_FUNC

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This commit is contained in:
Denis Vlasenko 2008-06-27 03:55:18 +00:00
parent defc1ea340
commit 42b8daf88a
1 changed files with 8 additions and 1 deletions
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9
include/platform.h
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@ -97,9 +97,15 @@
# endif
#endif
/* FAST_FUNC is a qualifier which (possibly) makes function call faster
* and/or smaller by using modified ABI. It is usually only needed
* on non-static, busybox internal functions. Recent versions of gcc
* optimize statics automatically. FAST_FUNC on static is required
* only if you need to match a function pointer's type */
#if __GNUC_PREREQ(3,0) && defined(i386)
/* || defined(__x86_64__)? */
# define FAST_FUNC __attribute__((regparm(3)))
/* #elif ... - add your favorite arch today! */
#else
# define FAST_FUNC
#endif
@ -145,8 +151,9 @@
/* ---- Unaligned access ------------------------------------ */
/* parameter is supposed to be an uint32_t* ptr */
#if defined(i386) || defined(__x86_64__) /* + other arches? */
#if defined(i386) || defined(__x86_64__)
#define get_unaligned_u32p(u32p) (*(u32p))
/* #elif ... - add your favorite arch today! */
#else
/* performs reasonably well (gcc usually inlines memcpy here) */
#define get_unaligned_u32p(u32p) ({ uint32_t __t; memcpy(&__t, (u32p), 4); __t; })