###### (This is the legacy documentation for SDL2, the previous stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current stable version.)
# SDL_SIMDRealloc

Reallocate memory obtained from [SDL_SIMDAlloc](SDL_SIMDAlloc)

## Header File

Defined in [SDL_cpuinfo.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_cpuinfo.h)

## Syntax

```c
void * SDL_SIMDRealloc(void *mem, const size_t len);
```

## Function Parameters

|              |         |                                                                                                                                                                                                     |
| ------------ | ------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| void *       | **mem** | The pointer obtained from [SDL_SIMDAlloc](SDL_SIMDAlloc). This function also accepts NULL, at which point this function is the same as calling [SDL_SIMDAlloc](SDL_SIMDAlloc) with a NULL pointer.  |
| const size_t | **len** | The length, in bytes, of the block to allocated. The actual allocated block might be larger due to padding, etc. Passing 0 will return a non-NULL pointer, assuming the system isn't out of memory. |

## Return Value

(void *) Returns a pointer to the newly-reallocated block, NULL if out of
memory.

## Remarks

It is not valid to use this function on a pointer from anything but
[SDL_SIMDAlloc](SDL_SIMDAlloc)(). It can't be used on pointers from malloc,
realloc, [SDL_malloc](SDL_malloc), memalign, new[], etc.

## Version

This function is available since SDL 2.0.14.

## See Also

- [SDL_SIMDGetAlignment](SDL_SIMDGetAlignment)
- [SDL_SIMDAlloc](SDL_SIMDAlloc)
- [SDL_SIMDFree](SDL_SIMDFree)

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryCPUInfo](CategoryCPUInfo)