[llvm] r200738 - RegAllocGreedy.cpp: Use more simple value as Hysteresis, to suppress -mfpmath-dependent behavior.

[Rafael Espíndola]

Why was the old value causing problems? It is probably a good idea to
document it in a comment.

On 4 February 2014 01:29, NAKAMURA Takumi <geek4civic at gmail.com> wrote:
> Author: chapuni
> Date: Tue Feb  4 00:29:38 2014
> New Revision: 200738
>
> URL: http://llvm.org/viewvc/llvm-project?rev=200738&view=rev
> Log:
> RegAllocGreedy.cpp: Use more simple value as Hysteresis, to suppress -mfpmath-dependent behavior.
>
> Modified:
>     llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp
>
> Modified: llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp?rev=200738&r1=200737&r2=200738&view=diff
> ==============================================================================
> --- llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp (original)
> +++ llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp Tue Feb  4 00:29:38 2014
> @@ -311,7 +311,7 @@ const char *const RAGreedy::StageName[]
>
>  // Hysteresis to use when comparing floats.
>  // This helps stabilize decisions based on float comparisons.
> -const float Hysteresis = 0.98f;
> +const float Hysteresis = (2007 / 2048.0f); // 0.97998046875
>
>
>  FunctionPass* llvm::createGreedyRegisterAllocator() {
>
>
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