SQRT_HALF          29 maint/gnulib/lib/log2.c #define SQRT_HALF 0.707106781186547524400844362104849039284
SQRT_HALF          39 maint/gnulib/lib/log2f.c #define SQRT_HALF 0.707106781186547524400844362104849039284f
SQRT_HALF          39 maint/gnulib/lib/log2l.c #define SQRT_HALF 0.707106781186547524400844362104849039284L