[llvm-commits] CVS: llvm/lib/Target/README.txt

[Andrew Lenharth]

He's been looking at the demo script.  I was trying that code out...

Andrew

On 11/12/06, Nick Lewycky <nicholas at mxc.ca> wrote:
>
>
> Changes in directory llvm/lib/Target:
>
> README.txt updated: 1.47 -> 1.48
> ---
> Log message:
>
> Cute example from Chris Lattner.
>
>
> ---
> Diffs of the changes:  (+40 -0)
>
>  README.txt |   40 ++++++++++++++++++++++++++++++++++++++++
>  1 files changed, 40 insertions(+)
>
>
> Index: llvm/lib/Target/README.txt
> diff -u llvm/lib/Target/README.txt:1.47 llvm/lib/Target/README.txt:1.48
> --- llvm/lib/Target/README.txt:1.47     Thu Nov  9 18:23:26 2006
> +++ llvm/lib/Target/README.txt  Sun Nov 12 18:23:28 2006
> @@ -360,3 +360,43 @@
>  pass.
>
>  //===---------------------------------------------------------------------===//
> +
> +-predsimplify should transform this:
> +
> +void bad(unsigned x)
> +{
> +  if (x > 4)
> +    bar(12);
> +  else if (x > 3)
> +    bar(523);
> +  else if (x > 2)
> +    bar(36);
> +  else if (x > 1)
> +    bar(65);
> +  else if (x > 0)
> +    bar(45);
> +  else
> +    bar(367);
> +}
> +
> +into:
> +
> +void good(unsigned x)
> +{
> +  if (x == 4)
> +    bar(523);
> +  else if (x == 3)
> +    bar(36);
> +  else if (x == 2)
> +    bar(65);
> +  else if (x == 1)
> +    bar(45);
> +  else if (x == 0)
> +    bar(367);
> +  else
> +    bar(12);
> +}
> +
> +to enable further optimizations.
> +
> +//===---------------------------------------------------------------------===//
>
>
>
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