adding test and fix for pairwise accumulate

VectorTest/TestAccumulator.cpp

@@ -423,4 +423,52 @@ TEST(TestAccumulator, simpleTransformAccumulate_BinaryFunc_X)
 	//eval over multiple lengths
 	evalTransformAccumulateInnerProduct_X(957, 1043);
 
-}
+}
+
+
+////////////////////////////////////////
+
+
+void evalAccumulateUR_X_pairwise(int startLen, int endLen)
+{
+	Numeric testEpsilon;
+	setEpsilonAccumulate(testEpsilon);
+
+
+	for (int SZ = startLen; SZ <= endLen; SZ++)
+	{
+		std::vector<Numeric>  v(SZ, asNumber(0.0));
+		for (int i = 0; i < SZ; i++)
+		{ 
+			v[i] -= asNumber(500.0 - i);
+		}
+
+		VecXX test(v);
+		auto Sum = [](auto lhs, auto rhs) { return lhs + rhs; };
+		Numeric resSTL = std::accumulate(v.begin(), v.end(), asNumber(0.0));
+		Numeric resAcc1 = ApplyAccumulate2UR_X_pairwise(test, Sum);
+		EXPECT_NEAR(resSTL, resAcc1, testEpsilon);
+	}
+
+}
+
+TEST(TestAccumulator, simple_pairwise)
+{
+	EXPECT_EQ(1, 1);
+	EXPECT_TRUE(true);
+
+	evalAccumulateUR_X_pairwise(32, 32);
+	evalAccumulateUR_X_pairwise(64, 64);
+	evalAccumulateUR_X_pairwise(128, 128);
+	evalAccumulateUR_X_pairwise(256, 256);
+	evalAccumulateUR_X_pairwise(512, 512);
+	evalAccumulateUR_X_pairwise(1024, 1024); 
+
+	evalAccumulateUR_X_pairwise(1, 80);
+
+	evalAccumulateUR_X_pairwise(957, 1043);
+
+
+	evalAccumulateUR_X_pairwise(159, 159);
+
+}

Vectorisation/VecX/accumulate_transform.h

@@ -703,8 +703,9 @@ typename InstructionTraits<INS_VEC>::FloatType ApplyAccumulate2UR_X_pairwise(con
 		if (working_Size & current_block_SZ)
 		{
 			accumulations_of_all_blocks += accum_recurse(pRhs, current_block_SZ, accum_recurse);
+			pRhs += current_block_SZ;
 		}
-
+		//pRhs += current_block_SZ;
 		current_block_SZ *= 2;
 	}