[PATCH] Do not generate a __morestack prologue, for functions with a stack of size zero

[Florian Zeitz]

Hi nadav,

When segmented stacks are used, this omits the usual __morestack prologue on functions that do not perform any stack allocations.
This ought to be valid since these functions never need to grow the stack.
This is particularly beneficial to small functions, where the prologue would otherwise outweigh the actual code.

http://reviews.llvm.org/D3863

Files:
  lib/Target/ARM/ARMFrameLowering.cpp
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/ARM/segmented-stacks.ll
  test/CodeGen/Thumb/segmented-stacks.ll
  test/CodeGen/X86/segmented-stacks.ll
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