# HG changeset patch
# User schloegl
# Date 1427748728 0
# Node ID be7bdefa4a1f0d0264c4240e1c5a8b8855345e1a
# Parent  5d4cdc6e7bec4638a2227ac71157ae55588b0ef6
[NaN] histo_mex: more efficient checks on isnan - requires less comparison operations

diff -r 5d4cdc6e7bec -r be7bdefa4a1f extra/NaN/src/histo_mex.cpp
--- a/extra/NaN/src/histo_mex.cpp	Mon Mar 30 20:48:51 2015 +0000
+++ b/extra/NaN/src/histo_mex.cpp	Mon Mar 30 20:52:08 2015 +0000
@@ -109,30 +109,24 @@
 			float f1,f2;
 			f1 = ((float*)Sort.Table)[ix1];
 			f2 = ((float*)Sort.Table)[ix2];
-			switch (__isnanf(f1) + 2*__isnanf(f2)) {
-				case 0:
-					if (f1<f2) z = -1; 
-					else if (f1>f2) z = 1; 
-				case 3:
-					break;
-				case 1: z = 1; break; 
-				case 2: z = -1; break; 
-				} 
+			z = __isnanf(f1) - __isnanf(f2);
+			if (z) break;
+			
+			if (f1<f2) z = -1; 
+			else if (f1>f2) z = 1; 
+			// else f1==f2 || (isnan(f1) && isnan(f2))	
 			break;
 			}
 		case mxDOUBLE_CLASS: {
 			double f1,f2;
 			f1 = ((double*)Sort.Table)[ix1];
 			f2 = ((double*)Sort.Table)[ix2];
-			switch (__isnan(f1) + 2*__isnan(f2)) {
-				case 0:
-					if (f1<f2) z = -1; 
-					else if (f1>f2) z = 1; 
-				case 3:
-					break;
-				case 1: z = 1; break; 
-				case 2: z = -1; break; 
-				} 
+			z = __isnan(f1) - __isnan(f2);
+			if (z) break;
+			
+			if (f1<f2) z = -1; 
+			else if (f1>f2) z = 1; 
+			// else f1==f2 || (isnan(f1) && isnan(f2))	
 			break;
 			}
 		case mxINT16_CLASS: {