improve name lookup performance in corner cases

[musl] / src / malloc / malloc.c

diff --git a/src/malloc/malloc.c b/src/malloc/malloc.c
index db4287e..39c7d05 100644 (file)
--- a/src/malloc/malloc.c
+++ b/src/malloc/malloc.c
@@ -43,8 +43,8 @@ static struct {
 #define DONTCARE 16
 #define RECLAIM 163840
 
-#define CHUNK_SIZE(c) ((c)->csize & SIZE_MASK)
-#define CHUNK_PSIZE(c) ((c)->psize & SIZE_MASK)
+#define CHUNK_SIZE(c) ((c)->csize & -2)
+#define CHUNK_PSIZE(c) ((c)->psize & -2)
 #define PREV_CHUNK(c) ((struct chunk *)((char *)(c) - CHUNK_PSIZE(c)))
 #define NEXT_CHUNK(c) ((struct chunk *)((char *)(c) + CHUNK_SIZE(c)))
 #define MEM_TO_CHUNK(p) (struct chunk *)((char *)(p) - OVERHEAD)
@@ -52,8 +52,6 @@ static struct {
 #define BIN_TO_CHUNK(i) (MEM_TO_CHUNK(&mal.bins[i].head))
 
 #define C_INUSE  ((size_t)1)
-#define C_FLAGS  ((size_t)3)
-#define C_SIZE   SIZE_MASK
 
 #define IS_MMAPPED(c) !((c)->csize & (C_INUSE))
 
@@ -394,7 +392,7 @@ void *realloc(void *p, size_t n)
                size_t oldlen = n0 + extra;
                size_t newlen = n + extra;
                /* Crash on realloc of freed chunk */
-               if ((uintptr_t)base < mal.brk) *(volatile char *)0=0;
+               if (extra & 1) a_crash();
                if (newlen < PAGE_SIZE && (new = malloc(n))) {
                        memcpy(new, p, n-OVERHEAD);
                        free(p);
@@ -457,7 +455,7 @@ void free(void *p)
                char *base = (char *)self - extra;
                size_t len = CHUNK_SIZE(self) + extra;
                /* Crash on double free */
-               if ((uintptr_t)base < mal.brk) *(volatile char *)0=0;
+               if (extra & 1) a_crash();
                __munmap(base, len);
                return;
        }