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title: "alloca | Microsoft Docs"
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# alloca
[_alloca](../c-runtime-library/reference/alloca.md) is required to be 16-byte aligned and additionally required to use a frame pointer.  
  
 The stack that is allocated needs to include space below it for parameters of subsequently called functions, as discussed in [Stack Allocation](../build/stack-allocation.md).  
  
## See Also  
 [Stack Usage](../build/stack-usage.md)