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workaround gcc got-register-reload performance problems in malloc

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with this patch, the malloc in libc.so built with -Os is nearly the
same speed as the one built with -O3. thus it solves the performance
regression that resulted from removing the forced -O3 when building
libc.so; now libc.so can be both small and fast.
This commit is contained in:
Rich Felker 2012-09-14 23:52:51 -04:00
parent 9f74574fe6
commit afd209deb7
1 changed files with 8 additions and 4 deletions
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12
src/malloc/malloc.c
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@ -9,6 +9,10 @@
#include "atomic.h" #include "atomic.h"
#include "pthread_impl.h" #include "pthread_impl.h"
#if defined(__GNUC__) && defined(__PIC__)
#define inline inline __attribute__((always_inline))
#endif
uintptr_t __brk(uintptr_t); uintptr_t __brk(uintptr_t);
void *__mmap(void *, size_t, int, int, int, off_t); void *__mmap(void *, size_t, int, int, int, off_t);
int __munmap(void *, size_t); int __munmap(void *, size_t);
@ -58,20 +62,20 @@ static struct {
/* Synchronization tools */ /* Synchronization tools */
static void lock(volatile int *lk) static inline void lock(volatile int *lk)
{ {
if (!libc.threads_minus_1) return; if (!libc.threads_minus_1) return;
while(a_swap(lk, 1)) __wait(lk, lk+1, 1, 1); while(a_swap(lk, 1)) __wait(lk, lk+1, 1, 1);
} }
static void unlock(volatile int *lk) static inline void unlock(volatile int *lk)
{ {
if (!libc.threads_minus_1) return; if (!libc.threads_minus_1) return;
a_store(lk, 0); a_store(lk, 0);
if (lk[1]) __wake(lk, 1, 1); if (lk[1]) __wake(lk, 1, 1);
} }
static void lock_bin(int i) static inline void lock_bin(int i)
{ {
if (libc.threads_minus_1) if (libc.threads_minus_1)
lock(mal.bins[i].lock); lock(mal.bins[i].lock);
@ -79,7 +83,7 @@ static void lock_bin(int i)
mal.bins[i].head = mal.bins[i].tail = BIN_TO_CHUNK(i); mal.bins[i].head = mal.bins[i].tail = BIN_TO_CHUNK(i);
} }
static void unlock_bin(int i) static inline void unlock_bin(int i)
{ {
if (!libc.threads_minus_1) return; if (!libc.threads_minus_1) return;
unlock(mal.bins[i].lock); unlock(mal.bins[i].lock);