init: HW1

part1/vectorOP.cpp

@@ -0,0 +1,72 @@
+#include "PPintrin.h"
+
+// implementation of absSerial(), but it is vectorized using PP intrinsics
+void absVector(float *values, float *output, int N)
+{
+  __pp_vec_float x;
+  __pp_vec_float result;
+  __pp_vec_float zero = _pp_vset_float(0.f);
+  __pp_mask maskAll, maskIsNegative, maskIsNotNegative;
+
+  //  Note: Take a careful look at this loop indexing.  This example
+  //  code is not guaranteed to work when (N % VECTOR_WIDTH) != 0.
+  //  Why is that the case?
+  for (int i = 0; i < N; i += VECTOR_WIDTH)
+  {
+
+    // All ones
+    maskAll = _pp_init_ones();
+
+    // All zeros
+    maskIsNegative = _pp_init_ones(0);
+
+    // Load vector of values from contiguous memory addresses
+    _pp_vload_float(x, values + i, maskAll); // x = values[i];
+
+    // Set mask according to predicate
+    _pp_vlt_float(maskIsNegative, x, zero, maskAll); // if (x < 0) {
+
+    // Execute instruction using mask ("if" clause)
+    _pp_vsub_float(result, zero, x, maskIsNegative); //   output[i] = -x;
+
+    // Inverse maskIsNegative to generate "else" mask
+    maskIsNotNegative = _pp_mask_not(maskIsNegative); // } else {
+
+    // Execute instruction ("else" clause)
+    _pp_vload_float(result, values + i, maskIsNotNegative); //   output[i] = x; }
+
+    // Write results back to memory
+    _pp_vstore_float(output + i, result, maskAll);
+  }
+}
+
+void clampedExpVector(float *values, int *exponents, float *output, int N)
+{
+  //
+  // PP STUDENTS TODO: Implement your vectorized version of
+  // clampedExpSerial() here.
+  //
+  // Your solution should work for any value of
+  // N and VECTOR_WIDTH, not just when VECTOR_WIDTH divides N
+  //
+  for (int i = 0; i < N; i += VECTOR_WIDTH)
+  {
+  }
+}
+
+// returns the sum of all elements in values
+// You can assume N is a multiple of VECTOR_WIDTH
+// You can assume VECTOR_WIDTH is a power of 2
+float arraySumVector(float *values, int N)
+{
+
+  //
+  // PP STUDENTS TODO: Implement your vectorized version of arraySumSerial here
+  //
+
+  for (int i = 0; i < N; i += VECTOR_WIDTH)
+  {
+  }
+
+  return 0.0;
+}