Fix hipTestFMA to support older compiler

The older compiler does not promote integral
arguments to double, instead it uses float.
This patch tries to support the old compiler
headers, and also the newer one.

Change-Id: I01e0b96a82ecddc6230cb5baf2573a318b25445b


[ROCm/clr commit: d432615faa]

projects/clr/hipamd/tests/src/deviceLib/hipTestFMA.cpp

@@ -43,19 +43,38 @@ THE SOFTWARE.
     double doubleResult = fma(d, d, 3.0);
     Check(floatResult != doubleResult);
 
-    // To align with libcxx, if any argument has integral type,
-    // it is cast to double.
-    // Check type promotes to double.
-    Check(fma(f, f, 3) == doubleResult);
-    Check(fma(f, f, (char)3) == doubleResult);
-    Check(fma(f, f, (unsigned char)3) == doubleResult);
-    Check(fma(f, f, (short)3) == doubleResult);
-    Check(fma(f, f, (unsigned short)3) == doubleResult);
-    Check(fma(f, f, (int)3) == doubleResult);
-    Check(fma(f, f, (unsigned int)3) == doubleResult);
-    Check(fma(f, f, (long)3) == doubleResult);
-    Check(fma(f, f, (unsigned long)3) == doubleResult);
-    Check(fma(f, f, true) == fma((double)f, (double)f, 1.0));
+    if(sizeof(decltype(fma(f, f, 3))) == 8) {
+      // To align with libcxx, if any argument has integral type,
+      // it is cast to double.
+      // Check type promotes to double.
+      Check(fma(f, f, 3) == doubleResult);
+      Check(fma(f, f, (char)3) == doubleResult);
+      Check(fma(f, f, (unsigned char)3) == doubleResult);
+      Check(fma(f, f, (short)3) == doubleResult);
+      Check(fma(f, f, (unsigned short)3) == doubleResult);
+      Check(fma(f, f, (int)3) == doubleResult);
+      Check(fma(f, f, (unsigned int)3) == doubleResult);
+      Check(fma(f, f, (long)3) == doubleResult);
+      Check(fma(f, f, (unsigned long)3) == doubleResult);
+      Check(fma(f, f, true) == fma((double)f, (double)f, 1.0));
+    } else if(sizeof(decltype(fma(f, f, 3))) == 4) {
+      // Previous HIP headers returns float type.
+      // Delete this to support backwards compatibility.
+      // check promote to float.
+      Check(fma(f, f, 3) == floatResult);
+      Check(fma(f, f, (char)3) == floatResult);
+      Check(fma(f, f, (unsigned char)3) == floatResult);
+      Check(fma(f, f, (short)3) == floatResult);
+      Check(fma(f, f, (unsigned short)3) == floatResult);
+      Check(fma(f, f, (int)3) == floatResult);
+      Check(fma(f, f, (unsigned int)3) == floatResult);
+      Check(fma(f, f, (long)3) == floatResult);
+      Check(fma(f, f, (unsigned long)3) == floatResult);
+      Check(fma(f, f, true) == fma(f, f, 1.0f));
+    } else {
+      assert(0 && "Invalid fma return type.");
+    }
+
     Check(fma(d, (double)f, 3) == doubleResult);
     Check(fma(d, (double)f, (char)3) == doubleResult);
     Check(fma(d, (double)f, (unsigned char)3) == doubleResult);