[llvm-commits] CVS: llvm/lib/Target/X86/X86ISelLowering.cpp

[Chris Lattner]

Thanks Anton!

On Apr 17, 2007, at 12:34 PM, Anton Korobeynikov wrote:

>
>
> Changes in directory llvm/lib/Target/X86:
>
> X86ISelLowering.cpp updated: 1.392 -> 1.393
> ---
> Log message:
>
> Add comment
>
>
> ---
> Diffs of the changes:  (+9 -0)
>
>  X86ISelLowering.cpp |    9 +++++++++
>  1 files changed, 9 insertions(+)
>
>
> Index: llvm/lib/Target/X86/X86ISelLowering.cpp
> diff -u llvm/lib/Target/X86/X86ISelLowering.cpp:1.392 llvm/lib/ 
> Target/X86/X86ISelLowering.cpp:1.393
> --- llvm/lib/Target/X86/X86ISelLowering.cpp:1.392	Tue Apr 17  
> 12:21:52 2007
> +++ llvm/lib/Target/X86/X86ISelLowering.cpp	Tue Apr 17 14:34:00 2007
> @@ -3406,8 +3406,17 @@
>      }
>  }
>
> +
> +// Lower dynamic stack allocation to _alloca call for Cygwin/Mingw  
> targets.
> +// Calls to _alloca is needed to probe the stack when allocating  
> more than 4k
> +// bytes in one go. Touching the stack at 4K increments is  
> necessary to ensure
> +// that the guard pages used by the OS virtual memory manager are  
> allocated in
> +// correct sequence.
>  SDOperand X86TargetLowering::LowerDYNAMIC_STACKALLOC(SDOperand Op,
>                                                       SelectionDAG  
> &DAG) {
> +  assert(Subtarget->isTargetCygMing() &&
> +         "This should be used only on Cygwin/Mingw targets");
> +
>    // Get the inputs.
>    SDOperand Chain = Op.getOperand(0);
>    SDOperand Size  = Op.getOperand(1);
>
>
>
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