Specify precision in the format flag for float4 hexadecimal output (K…

…hronosGroup#2064)

This will ensure consistent output on any conforming implementation.
Note that the specification does not define the output style when
precision is missing.

---------

Signed-off-by: Cui, Dele <dele.cui@intel.com>

test_conformance/printf/util_printf.cpp

@@ -955,7 +955,7 @@ std::vector<printDataGenParameters> printVectorGenParameters = {
 
     // Four component vector in hexadecimal floating point, lowercase format
 
-    { { "" }, "(0.25f,0.5f,1.f,1.5f)", "%", "a", "float", "4" },
+    { { "" }, "(0.25f,0.5f,1.f,1.5f)", "%.1", "a", "float", "4" },
 
     // Eight component vector in the shortest float representation
 
@@ -1007,7 +1007,7 @@ std::vector<std::string> correctBufferVector = {
 
     "1.23e+03,9.88e+05,5.00e-04",
 
-    "0x1p-2,0x1p-1,0x1p+0,0x1.8p+0",
+    "0x1.0p-2,0x1.0p-1,0x1.0p+0,0x1.8p+0",
 
     "1,2,3,4,1.5,3.14,2.5,3.5",