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libm/stdlib: Realloc when shrinking by 2* or more

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This reduces memory usage when reallocating objects much smaller.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard via Newlib 2020-08-13 17:19:02 -07:00 committed by Ken Brown
parent fd43311e52
commit b53ce64154
1 changed files with 3 additions and 3 deletions
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6
newlib/libc/stdlib/nano-mallocr.c
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@ -476,15 +476,15 @@ void * nano_realloc(RARG void * ptr, malloc_size_t size)
return NULL; 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); old_size = nano_malloc_usable_size(RCALL ptr);
if (old_size >= size) if (size <= old_size && (old_size >> 1) < size)
return ptr; return ptr;
mem = nano_malloc(RCALL size); mem = nano_malloc(RCALL size);
if (mem != NULL) if (mem != NULL)
{ {
if (old_size > size)
old_size = size;
memcpy(mem, ptr, old_size); memcpy(mem, ptr, old_size);
nano_free(RCALL ptr); nano_free(RCALL ptr);
} }