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authorMiles Bader <miles@lsi.nec.co.jp>2002-08-14 09:14:40 +0000
committerMiles Bader <miles@lsi.nec.co.jp>2002-08-14 09:14:40 +0000
commit1c0f265241054461db57bd51209ef26773125caa (patch)
tree243a196d8da44cbf701178389d84b070a08c5729 /libc/stdlib/malloc/malloc.c
parent992f2d15e296d0a746f5161ebf3d4511ead9d99d (diff)
Add flow-control hints with __malloc_likely and __malloc_unlikely.
Diffstat (limited to 'libc/stdlib/malloc/malloc.c')
-rw-r--r--libc/stdlib/malloc/malloc.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/libc/stdlib/malloc/malloc.c b/libc/stdlib/malloc/malloc.c
index db953a9c0..b2fb6677b 100644
--- a/libc/stdlib/malloc/malloc.c
+++ b/libc/stdlib/malloc/malloc.c
@@ -45,9 +45,11 @@ malloc (size_t size)
__malloc_lock ();
+ /* First try to get memory that's already in our heap. */
mem = __heap_alloc (heap, &size);
- if (! mem)
- /* We couldn't allocate from the heap, so get some more memory
+
+ if (__malloc_unlikely (! mem))
+ /* We couldn't allocate from the heap, so grab some more
from the system, add it to the heap, and try again. */
{
/* If we're trying to allocate a block bigger than the default
@@ -74,7 +76,7 @@ malloc (size_t size)
/* Use sbrk we can, as it's faster than mmap, and guarantees
contiguous allocation. */
block = sbrk (block_size);
- if (block != (void *)-1)
+ if (__malloc_likely (block != (void *)-1))
{
/* Because sbrk can return results of arbitrary
alignment, align the result to a MALLOC_ALIGNMENT boundary. */
@@ -103,7 +105,7 @@ malloc (size_t size)
/* Get back the main lock. */
__malloc_lock ();
- if (block != (void *)-1)
+ if (__malloc_likely (block != (void *)-1))
{
MALLOC_DEBUG (" adding memory: 0x%lx - 0x%lx (%d bytes)\n",
(long)block, (long)block + block_size, block_size);
@@ -118,7 +120,7 @@ malloc (size_t size)
__malloc_unlock ();
- if (mem)
+ if (__malloc_likely (mem))
/* Record the size of this block. */
{
mem = MALLOC_ADDR (mem);