fixed l3cache hang using memory arbiter in afu

driver/tests/dogfood/testcases.h

@@ -14,17 +14,29 @@ union Float_t {
     } parts;
 };
 
+inline float fround(float x, int32_t precision = 4) {
+  auto power_of_10 = std::pow(10, precision);
+  return std::round(x * power_of_10) / power_of_10;
+}
+
 inline bool almost_equal_eps(float a, float b, float eps = std::numeric_limits<float>::epsilon()) {
-  auto tolerance = std::max(fabs(a), fabs(b)) * eps;
+  auto tolerance = std::min(fabs(a), fabs(b)) * eps;
   return fabs(a - b) <= tolerance;
 }
 
-inline bool almost_equal_ulp(float a, float b, int32_t ulp = 5) {
+inline bool almost_equal_ulp(float a, float b, int32_t ulp = 4) {
   Float_t fa{a}, fb{b};
-  return std::abs(fa.i - fb.i) <= ulp;
+  auto d = std::abs(fa.i - fb.i);
+  if (d > ulp) {
+    std::cout << "*** float compare: a=" << a << ", b=" << b << ", ulp=" << d << ", ia=" << std::hex << fa.i << ", ib=" << fb.i << std::endl;
+    return false;
+  }
+  return true;
 }
 
 inline bool almost_equal(float a, float b) {
+  if (almost_equal_eps(a, b))
+    return true;
   return almost_equal_ulp(a, b);
 }
 
@@ -158,8 +170,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -186,8 +198,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -214,8 +226,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -242,8 +254,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -270,8 +282,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -298,8 +310,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -326,8 +338,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -354,8 +366,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -384,8 +396,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -412,8 +424,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n - i) * (1.0f/n);
-      b[i] = (n + i) * (1.0f/n);
+      a[i] = fround((n - i) * (1.0f/n));
+      b[i] = fround((n + i) * (1.0f/n));
     }
   }
   
@@ -442,7 +454,7 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      int q = 1.0f + (i % 64);
+      float q = 1.0f + (i % 64);
       a[i] = q;
       b[i] = q;
     }
@@ -471,8 +483,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = (n/2 - i) * (1.0f/n);
-      b[i] = (n/2 - i) * (1.0f/n);
+      a[i] = fround((n/2 - i) * (1.0f/n));
+      b[i] = fround((n/2 - i) * (1.0f/n));
     }
   }
   
@@ -500,8 +512,8 @@ public:
     auto a = (float*)src1;
     auto b = (float*)src2;
     for (int i = 0; i < n; ++i) {
-      a[i] = i * (1.0f/n);
-      b[i] = i * (1.0f/n);
+      a[i] = fround(i * (1.0f/n));
+      b[i] = fround(i * (1.0f/n));
     }
   }