[cfe-commits] r59173 - /cfe/trunk/include/clang/AST/TypeOrdering.h

[Daniel Dunbar]

Out of curiosity, was this motivated by a test case? Should we care
about monitoring performance of this?

 - Daniel

On Wed, Nov 12, 2008 at 1:52 PM, Douglas Gregor <doug.gregor at gmail.com> wrote:
> Author: dgregor
> Date: Wed Nov 12 15:52:20 2008
> New Revision: 59173
>
> URL: http://llvm.org/viewvc/llvm-project?rev=59173&view=rev
> Log:
> Slightly improve type hash
>
> Modified:
>    cfe/trunk/include/clang/AST/TypeOrdering.h
>
> Modified: cfe/trunk/include/clang/AST/TypeOrdering.h
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/TypeOrdering.h?rev=59173&r1=59172&r2=59173&view=diff
>
> ==============================================================================
> --- cfe/trunk/include/clang/AST/TypeOrdering.h (original)
> +++ cfe/trunk/include/clang/AST/TypeOrdering.h Wed Nov 12 15:52:20 2008
> @@ -42,7 +42,8 @@
>     }
>
>     static unsigned getHashValue(clang::QualType Val) {
> -      return (unsigned)Val.getAsOpaquePtr();
> +      return (unsigned)Val.getAsOpaquePtr() ^
> +             ((unsigned)Val.getAsOpaquePtr() >> 9);
>     }
>
>     static bool isEqual(clang::QualType LHS, clang::QualType RHS) {
>
>
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