Fixes for report #63583: High CPU time spent in TMath::Erf

[u/mrichter/AliRoot.git] / TRD / AliTRDCalibraFit.cxx

diff --git a/TRD/AliTRDCalibraFit.cxx b/TRD/AliTRDCalibraFit.cxx
index 377b9fbd7759aede96a6de508f3ced43bbd774ae..e922d841b349994b000ddc205450c81fc55f977f 100644 (file)
--- a/TRD/AliTRDCalibraFit.cxx
+++ b/TRD/AliTRDCalibraFit.cxx
@@ -5971,9 +5971,9 @@ Double_t AliTRDCalibraFit::AsymmGauss(const Double_t *x, const Double_t *par)
   Double_t  sigma2  = par2save*par2save;
   Double_t  sqrt2   = TMath::Sqrt(2.0);
   Double_t  exp1    = par3save * TMath::Exp(-par3save * (dx - 0.5 * par3save * sigma2))
-                               * (1.0 - TMath::Erf((par3save * sigma2 - dx) / (sqrt2 * par2save)));
+                               * (1.0 - AliMathBase::ErfFast((par3save * sigma2 - dx) / (sqrt2 * par2save)));
   Double_t  exp2    = par5save * TMath::Exp(-par5save * (dx - 0.5 * par5save * sigma2))
-                               * (1.0 - TMath::Erf((par5save * sigma2 - dx) / (sqrt2 * par2save)));
+                               * (1.0 - AliMathBase::ErfFast((par5save * sigma2 - dx) / (sqrt2 * par2save)));
 
   //return par[0]*(exp1+par[4]*exp2);
   return par[0] * (exp1 + 1.00124 * exp2);