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blob: add some likelyness to help compiler optimizations

cute-signatures
Timo Teras 2009-07-14 14:08:15 +03:00
parent 8d1eeb58e4
commit e98d8253b9
2 changed files with 24 additions and 12 deletions
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12
src/apk_defines.h
View File

@ -30,6 +30,18 @@
#define NULL 0L #define NULL 0L
#endif #endif
#if defined __GNUC__ && __GNUC__ == 2 && __GNUC_MINOR__ < 96
#define __builtin_expect(x, expected_value) (x)
#endif
#ifndef likely
#define likely(x) __builtin_expect((!!(x)),1)
#endif
#ifndef unlikely
#define unlikely(x) __builtin_expect((!!(x)),0)
#endif
#ifndef container_of #ifndef container_of
#define container_of(ptr, type, member) ({ \ #define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \ const typeof( ((type *)0)->member ) *__mptr = (ptr); \

24
src/blob.c
View File

@ -142,9 +142,9 @@ int apk_blob_for_each_segment(apk_blob_t blob, const char *split,
static inline int dx(int c) static inline int dx(int c)
{ {
if (c >= '0' && c <= '9') if (likely(c >= '0' && c <= '9'))
return c - '0'; return c - '0';
if (c >= 'a' && c <= 'f') if (likely(c >= 'a' && c <= 'f'))
return c - 'a' + 0xa; return c - 'a' + 0xa;
if (c >= 'A' && c <= 'F') if (c >= 'A' && c <= 'F')
return c - 'A' + 0xa; return c - 'A' + 0xa;
@ -153,10 +153,10 @@ static inline int dx(int c)
void apk_blob_push_blob(apk_blob_t *to, apk_blob_t literal) void apk_blob_push_blob(apk_blob_t *to, apk_blob_t literal)
{ {
if (APK_BLOB_IS_NULL(*to)) if (unlikely(APK_BLOB_IS_NULL(*to)))
return; return;
if (to->len < literal.len) { if (unlikely(to->len < literal.len)) {
*to = APK_BLOB_NULL; *to = APK_BLOB_NULL;
return; return;
} }
@ -191,10 +191,10 @@ void apk_blob_push_hexdump(apk_blob_t *to, apk_blob_t binary)
char *d; char *d;
int i; int i;
if (APK_BLOB_IS_NULL(*to)) if (unlikely(APK_BLOB_IS_NULL(*to)))
return; return;
if (to->len < binary.len * 2) { if (unlikely(to->len < binary.len * 2)) {
*to = APK_BLOB_NULL; *to = APK_BLOB_NULL;
return; return;
} }
@ -209,9 +209,9 @@ void apk_blob_push_hexdump(apk_blob_t *to, apk_blob_t binary)
void apk_blob_pull_char(apk_blob_t *b, int expected) void apk_blob_pull_char(apk_blob_t *b, int expected)
{ {
if (APK_BLOB_IS_NULL(*b)) if (unlikely(APK_BLOB_IS_NULL(*b)))
return; return;
if (b->len < 1 || b->ptr[0] != expected) { if (unlikely(b->len < 1 || b->ptr[0] != expected)) {
*b = APK_BLOB_NULL; *b = APK_BLOB_NULL;
return; return;
} }
@ -244,18 +244,18 @@ void apk_blob_pull_hexdump(apk_blob_t *b, apk_blob_t to)
char *s, *d; char *s, *d;
int i, r1, r2; int i, r1, r2;
if (APK_BLOB_IS_NULL(*b)) if (unlikely(APK_BLOB_IS_NULL(*b)))
return; return;
if (to.len > b->len * 2) if (unlikely(to.len > b->len * 2))
goto err; goto err;
for (i = 0, s = b->ptr, d = to.ptr; i < to.len; i++) { for (i = 0, s = b->ptr, d = to.ptr; i < to.len; i++) {
r1 = dx(*(s++)); r1 = dx(*(s++));
if (r1 < 0) if (unlikely(r1 < 0))
goto err; goto err;
r2 = dx(*(s++)); r2 = dx(*(s++));
if (r2 < 0) if (unlikely(r2 < 0))
goto err; goto err;
*(d++) = (r1 << 4) + r2; *(d++) = (r1 << 4) + r2;
} }