more ILP in some nearly sorted bucket parts in spsort - rand still not good so much

space_partitioning_sort/spsort.h

@@ -139,15 +139,18 @@ inline int internal_array_separate(uint32_t *t, int n, uint32_t mid) {
 		int left = 0;
 		int right = n - 1;
 		while(left < right) {
-			bool lok = (t[left] < mid);
-			bool rok = (t[right] >= mid);
-			if(lok || rok) {
-				// HOT PATH
-				// Move heads until both in wrong location
-				left += lok;
-				right -= rok;
-			} else {
-				// REGULAR PATH
+			// Step over already good positioned values from left
+			while((left < right) && (t[left] < mid)) {
+				++left;
+			}
+
+			// Step over already good positioned values from right
+			while((left < right) && (t[right] >= mid)) {
+				--right;
+			}
+
+			// Extra check needed for edge-case!
+			if(left < right) {
 				// Both in wrong location - xchg them!
 				auto tmp = t[right];
 				t[right] = t[left];
@@ -159,7 +162,6 @@ inline int internal_array_separate(uint32_t *t, int n, uint32_t mid) {
 
 		// Edge-case increment if single elem happens in middle in the end
 		left += ((left == right) && (t[left] < mid));
-
 		return left;
 	}
 

ypsu.cpp

@@ -419,8 +419,8 @@
     //int n = 64;
 
     // Uncomment this for profiling and alg!
-    measure_single(n);
-    return 0;
+    //measure_single(n);
+    //return 0;
 
     for (auto inputtype : inputtypes) {
       printf("%10s", inputtype.c_str());