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Cider Isn't Darwin Emulation, Really
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/* * erff.c * * by Ian Ollmann * * Copyright (c) 2007, Apple Inc. All Rights Reserved. */ #include <math.h>#include <stdint.h>#include "erf.h"
float erff( float x ){ union{ float d; uint32_t u;} u = { x };
uint32_t sign = u.u & 0x80000000U;
//Inf, NaN, 0 if( (u.u & 0x7fffffffU) - 1U >= 0x7f800000U - 1U ) { if( 0.0f == x ) return x; if( x != x ) return x + x; u.u = 0x3f800000U | sign; return u.d; } u.d = (float) ErrFunApprox( (double) x, 1.0, 0 ); u.u ^= sign; return u.d;}