added more documentation and minor fixes

src/eliminate_identity.cpp

@@ -3,7 +3,6 @@
 #include <migraphx/instruction.hpp>
 #include <migraphx/operators.hpp>
 #include <migraphx/iterator_for.hpp>
-#include <migraphx/ranges.hpp>
 #include <migraphx/stringutils.hpp>
 #include <utility>
 

src/include/migraphx/eliminate_identity.hpp

@@ -11,7 +11,9 @@ inline namespace MIGRAPHX_INLINE_NS {
 struct program;
 
 /**
- * Remove identity instructions.
+ * Remove identity instructions. Currently when used as the last pass, it will
+ * preserve the semantics of previous program state, therefore dead code elimination
+ * should not be used afterwards.
  */
 struct eliminate_identity
 {

test/eliminate_identity_test.cpp

@@ -59,7 +59,7 @@ TEST_CASE(simple_test_end_dependency)
     p.add_instruction(sum_op{}, ans, three);
     p.add_instruction(migraphx::op::identity{}, ans);
     p.compile(eliminate_identity_target{});
-    EXPECT(!std::none_of(p.begin(), p.end(), [](const migraphx::instruction& ins) {
+    EXPECT(std::any_of(p.begin(), p.end(), [](const migraphx::instruction& ins) {
         return ins.name() == "identity";
     }));
     auto result = p.eval({});