diff options
author | Keith Packard via Newlib <newlib@sourceware.org> | 2020-08-14 03:19:02 +0300 |
---|---|---|
committer | Corinna Vinschen <corinna@vinschen.de> | 2020-08-17 12:43:55 +0300 |
commit | 8a7ec55c535cddd74d45a2f6fb644ecded114de8 (patch) | |
tree | a174c521143b21a82f2c8274e14601fde41a0b66 | |
parent | ce4044adeebfdc60714d3a35f67ba536edb55612 (diff) |
libm/stdlib: Realloc when shrinking by 2* or more
This reduces memory usage when reallocating objects much smaller.
Signed-off-by: Keith Packard <keithp@keithp.com>
-rw-r--r-- | newlib/libc/stdlib/nano-mallocr.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/newlib/libc/stdlib/nano-mallocr.c b/newlib/libc/stdlib/nano-mallocr.c index 3970753a9..6ba0eb74b 100644 --- a/newlib/libc/stdlib/nano-mallocr.c +++ b/newlib/libc/stdlib/nano-mallocr.c @@ -476,15 +476,15 @@ void * nano_realloc(RARG void * ptr, malloc_size_t size) return NULL; } - /* TODO: There is chance to shrink the chunk if newly requested - * size is much small */ old_size = nano_malloc_usable_size(RCALL ptr); - if (old_size >= size) + if (size <= old_size && (old_size >> 1) < size) return ptr; mem = nano_malloc(RCALL size); if (mem != NULL) { + if (old_size > size) + old_size = size; memcpy(mem, ptr, old_size); nano_free(RCALL ptr); } |