Remove clamping for converts (#1853)

Fixes #1852  Fixes #1847

src/include/migraphx/op/convert.hpp

@@ -66,17 +66,7 @@ struct convert : unary<convert>
         auto type = target_type;
         return [type](auto x) {
             auto y = x;
-            shape::visit(type, [&](auto as) {
-                // clamping value between target_type's max and min doesn't work for NaNs,
-                if(std::isnan(x))
-                {
-                    y = as.nan();
-                }
-                else
-                {
-                    y = std::min(std::max(as(x), as.min()), as.max());
-                }
-            });
+            shape::visit(type, [&](auto as) { y = as(x); });
             return y;
         };
     }

test/verify/test_pad_highest.cpp

@@ -38,7 +38,7 @@ struct test_pad_highest : verify_program<test_pad_highest>
         migraphx::shape s0{migraphx::shape::half_type, {2, 2}};
         auto l0 = mm->add_literal(migraphx::literal{s0, data0});
         migraphx::op::pad op{};
-        op.value = std::numeric_limits<float>::max();
+        op.value = std::numeric_limits<migraphx::half>::max();
         op.pads  = {0, 0, 1, 1};
         mm->add_instruction(op, l0);
         return p;

test/verify/test_pad_lowest.cpp

@@ -38,7 +38,7 @@ struct test_pad_lowest : verify_program<test_pad_lowest>
         migraphx::shape s0{migraphx::shape::half_type, {2, 2}};
         auto l0 = mm->add_literal(migraphx::literal{s0, data0});
         migraphx::op::pad op{};
-        op.value = std::numeric_limits<float>::lowest();
+        op.value = std::numeric_limits<migraphx::half>::lowest();
         op.pads  = {0, 0, 1, 1};
         mm->add_instruction(op, l0);
         return p;