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Tobias Schlüter 8637249945 Use portable expression for constant 2/sqrt(pi) 
M_2_SQRTPI is not part of standard C++, replace it with an
equivalent expression.  gcc immediately folds this and thus
generates the same code even at -O0.

Change-Id: I5d38e67a4508c1d43a1a8e5f1639f2243cdb143e
2021-01-30 23:19:07 +09:00
..
ceres
Use portable expression for constant 2/sqrt(pi)
2021-01-30 23:19:07 +09:00