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---
# Data Alignment
The following C run-time functions support data alignment.  
  
### Data-Alignment Routines  
  
|Routine|Use|  
|-------------|---------|  
|[_aligned_free](../c-runtime-library/reference/aligned-free.md)|Frees a block of memory that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md)or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md).|  
|[_aligned_free_dbg](../c-runtime-library/reference/aligned-free-dbg.md)|Frees a block of memory that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md) (debug only).|  
|[_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md)|Allocates memory on a specified alignment boundary.|  
|[_aligned_malloc_dbg](../c-runtime-library/reference/aligned-malloc-dbg.md)|Allocates memory on a specified alignment boundary with additional space for a debugging header and overwrite buffers (debug version only).|  
|[_aligned_msize](../c-runtime-library/reference/aligned-msize.md)|Returns the size of a memory block allocated in the heap.|  
|[_aligned_msize_dbg](../c-runtime-library/reference/aligned-msize-dbg.md)|Returns the size of a memory block allocated in the heap (debug version only).|  
|[_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md)|Allocates memory on a specified alignment boundary.|  
|[_aligned_offset_malloc_dbg](../c-runtime-library/reference/aligned-offset-malloc-dbg.md)|Allocates memory on a specified alignment boundary (debug version only).|  
|[_aligned_offset_realloc](../c-runtime-library/reference/aligned-offset-realloc.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md).|  
|[_aligned_offset_realloc_dbg](../c-runtime-library/reference/aligned-offset-realloc-dbg.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md) (debug version only).|  
|[_aligned_offset_recalloc](../c-runtime-library/reference/aligned-offset-recalloc.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md) and initializes the memory to 0.|  
|[_aligned_offset_recalloc_dbg](../c-runtime-library/reference/aligned-offset-recalloc-dbg.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md) and initializes the memory to 0 (debug version only).|  
|[_aligned_realloc](../c-runtime-library/reference/aligned-realloc.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md).|  
|[_aligned_realloc_dbg](../c-runtime-library/reference/aligned-realloc-dbg.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md) (debug version only).|  
|[_aligned_recalloc](../c-runtime-library/reference/aligned-recalloc.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md) and initializes the memory to 0.|  
|[_aligned_recalloc_dbg](../c-runtime-library/reference/aligned-recalloc-dbg.md)|Changes the size of a memory block that was allocated with [_aligned_malloc](../c-runtime-library/reference/aligned-malloc.md) or [_aligned_offset_malloc](../c-runtime-library/reference/aligned-offset-malloc.md) and initializes the memory to 0 (debug version only).|  
  
## See Also  
 [Run-Time Routines by Category](../c-runtime-library/run-time-routines-by-category.md)