Fix hipTestFMA to align with libcxx

The HIP-Clang math headers upstream have been updated
to perform type promotion on math function overloads.
If any argument has integral type, it will be cast to
double.

Change-Id: I38d9e6240c40c4092b946851469498b2ae6500ae


[ROCm/hip commit: 1f0037eefc]

projects/hip/tests/src/deviceLib/hipTestFMA.cpp

@@ -43,19 +43,19 @@ THE SOFTWARE.
     double doubleResult = fma(d, d, 3.0);
     Check(floatResult != doubleResult);
 
-    // 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));
-
-    // check promote to double.
+    // 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));
     Check(fma(d, (double)f, 3) == doubleResult);
     Check(fma(d, (double)f, (char)3) == doubleResult);
     Check(fma(d, (double)f, (unsigned char)3) == doubleResult);