[llvm] r176136 - Have a way for a target to opt-out of target-independent fast isel

[Eli Bendersky]

Can you provide more background for this change? Is it being done for
the sake of debugging? What are the intended use cases?

On Tue, Feb 26, 2013 at 3:15 PM, Michael Ilseman <milseman at apple.com> wrote:
> Author: milseman
> Date: Tue Feb 26 17:15:23 2013
> New Revision: 176136
>
> URL: http://llvm.org/viewvc/llvm-project?rev=176136&view=rev
> Log:
> Have a way for a target to opt-out of target-independent fast isel
>
> Modified:
>     llvm/trunk/include/llvm/CodeGen/FastISel.h
>     llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp
>
> Modified: llvm/trunk/include/llvm/CodeGen/FastISel.h
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/FastISel.h?rev=176136&r1=176135&r2=176136&view=diff
> ==============================================================================
> --- llvm/trunk/include/llvm/CodeGen/FastISel.h (original)
> +++ llvm/trunk/include/llvm/CodeGen/FastISel.h Tue Feb 26 17:15:23 2013
> @@ -372,6 +372,11 @@ protected:
>      return 0;
>    }
>
> +  /// Whether we should skip target-independent fast-isel
> +  virtual bool SkipTargetIndependentFastISel() {
> +    return false;
> +  }
> +
>  private:
>    bool SelectBinaryOp(const User *I, unsigned ISDOpcode);
>
>
> Modified: llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp?rev=176136&r1=176135&r2=176136&view=diff
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp (original)
> +++ llvm/trunk/lib/CodeGen/SelectionDAG/FastISel.cpp Tue Feb 26 17:15:23 2013
> @@ -822,7 +822,7 @@ FastISel::SelectInstruction(const Instru
>    }
>
>    // First, try doing target-independent selection.
> -  if (SelectOperator(I, I->getOpcode())) {
> +  if (!SkipTargetIndependentFastISel() && SelectOperator(I, I->getOpcode())) {
>      ++NumFastIselSuccessIndependent;
>      DL = DebugLoc();
>      return true;
>
>
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