[PATCH] Simple sqrt implementation for sphereflake

[Renato Golin]

Hi ddunbar,

Reports about different results depending on which GCC was used to run the test-suite have prompted me to implement sqrt() as a simple function to avoid library issues. The results on x86_64, ARM and AArch64 are identical, even across Clang and GCC 4.8.

The new implementation should be safe for values between 10^-10 and 10^10. For this particular case, though, it's more than enough.

The images remained pretty. ;)

http://reviews.llvm.org/D3667

Files:
  SingleSource/Benchmarks/Misc-C++/Large/sphereflake.cpp
  SingleSource/Benchmarks/Misc-C++/Large/sphereflake.reference_output
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