Changeset 82d239a in sasmodels for sasmodels/models/fcc.c

Timestamp:

Nov 25, 2015 11:08:03 AM (8 years ago)

Author:

Paul Kienzle <pkienzle@…>

Branches:

master, core_shell_microgels, costrafo411, magnetic_model, release_v0.94, release_v0.95, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests

Children:

38d8774

Parents:

dc056b9

Message:

minor performance improvement for bcc/fcc by precalculating trig

File:

• sasmodels/models/fcc.c (modified) (1 diff)

sasmodels/models/fcc.c

@@ -22 +22 @@
 double _FCCeval(double Theta, double Phi, double temp1, double temp3) {
 
-        double temp6,temp7,temp8,temp9,temp10;
         double result;
+        double sin_theta,cos_theta,sin_phi,cos_phi;
+        SINCOS(Theta, sin_theta, cos_theta);
+        SINCOS(Phi, sin_phi, cos_phi);
 
-        temp6 = sin(Theta);
-        temp7 = sin(Theta)*sin(Phi)+cos(Theta);
-        temp8 = -1.0*sin(Theta)*cos(Phi)+cos(Theta);
-        temp9 = -1.0*sin(Theta)*cos(Phi)+sin(Theta)*sin(Phi);
-        temp10 = exp((-1.0/8.0)*temp1*((temp7*temp7)+(temp8*temp8)+(temp9*temp9)));
-        result = pow((1.0-(temp10*temp10)),3)*temp6/((1.0-2.0*temp10*cos(0.5*temp3*(temp7))+(temp10*temp10))*(1.0-2.0*temp10*cos(0.5*temp3*(temp8))+(temp10*temp10))*(1.0-2.0*temp10*cos(0.5*temp3*(temp9))+(temp10*temp10)));
+        const double temp6 =  sin_theta;
+        const double temp7 =  sin_theta*sin_phi + cos_theta;
+        const double temp8 = -sin_theta*cos_phi + cos_theta;
+        const double temp9 = -sin_theta*cos_phi + sin_theta*sin_phi;
+
+        const double temp10 = exp((-1.0/8.0)*temp1*((temp7*temp7)+(temp8*temp8)+(temp9*temp9)));
+        result = pow((1.0-(temp10*temp10)),3)*temp6
+            / ( (1.0 - 2.0*temp10*cos(0.5*temp3*temp7) + temp10*temp10)
+              * (1.0 - 2.0*temp10*cos(0.5*temp3*temp8) + temp10*temp10)
+              * (1.0 - 2.0*temp10*cos(0.5*temp3*temp9) + temp10*temp10));
 
         return (result);