[quick fix] Change neg unit ops to use insert instruction (#1562)

Using add_instruction for the neg op was causing issues on replace_instruction. Changed to use insert_instruction.  Tests and added a new one that is failing without the change.

src/simplify_algebra.cpp

@@ -982,7 +982,7 @@ struct find_neg_unit_ops
         auto ins  = r.result;
         auto c_in = r.instructions["x"];
 
-        auto neg = m.add_instruction(make_op("neg"), c_in);
+        auto neg = m.insert_instruction(ins, make_op("neg"), c_in);
         m.replace_instruction(ins, neg);
     }
 };

test/simplify_algebra_test.cpp

@@ -1067,16 +1067,18 @@ TEST_CASE(simplify_neg_unit_mult_const)
 {
     migraphx::module m1;
     {
-        auto x    = m1.add_parameter("x", {migraphx::shape::int32_type, {1}});
-        auto unit = m1.add_literal(-1);
+        auto x    = m1.add_parameter("x", {migraphx::shape::int32_type, {1, 6}});
+        auto unit = m1.add_literal(
+            migraphx::literal{{migraphx::shape::int32_type, {1, 6}}, std::vector<int>(6, -1)});
         m1.add_instruction(migraphx::make_op("mul"), x, unit);
     }
     run_pass(m1);
 
     migraphx::module m2;
     {
-        auto x = m2.add_parameter("x", {migraphx::shape::int32_type, {1}});
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x  = m2.add_parameter("x", {migraphx::shape::int32_type, {1, 6}});
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
     }
 
     EXPECT((m1 == m2));
@@ -1095,7 +1097,29 @@ TEST_CASE(simplify_neg_unit_mult_const2)
     migraphx::module m2;
     {
         auto x  = m2.add_parameter("x", {migraphx::shape::int32_type, {1}});
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
+    }
+
+    EXPECT((m1 == m2));
+}
+
+TEST_CASE(simplify_neg_unit_mult_const_add)
+{
+    migraphx::module m1;
+    {
+        auto unit = m1.add_literal(-1);
+        auto x    = m1.add_parameter("x", {migraphx::shape::int32_type, {1}});
+        auto x2   = m1.add_instruction(migraphx::make_op("mul"), unit, x);
+        m1.add_instruction(migraphx::make_op("add"), x2, x2);
+    }
+    run_pass(m1);
+
+    migraphx::module m2;
+    {
+        auto x  = m2.add_parameter("x", {migraphx::shape::int32_type, {1}});
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("add"), x2, x2);
     }
 
     EXPECT((m1 == m2));
@@ -1118,7 +1142,8 @@ TEST_CASE(simplify_neg_unit_mul_const_vec)
     migraphx::module m2;
     {
         auto x  = m2.add_parameter("x", x_shape);
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
     }
 
     EXPECT(m1 == m2);
@@ -1141,7 +1166,8 @@ TEST_CASE(simplify_neg_unit_mul_const_vec2)
     migraphx::module m2;
     {
         auto x  = m2.add_parameter("x", x_shape);
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
     }
 
     EXPECT(m1 == m2);
@@ -1160,7 +1186,8 @@ TEST_CASE(simplify_neg_unit_div_const)
     migraphx::module m2;
     {
         auto x  = m2.add_parameter("x", {migraphx::shape::int32_type, {1}});
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
     }
 
     EXPECT(m1 == m2);
@@ -1183,7 +1210,8 @@ TEST_CASE(simplify_neg_unit_div_const_vec)
     migraphx::module m2;
     {
         auto x  = m2.add_parameter("x", x_shape);
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
     }
 
     EXPECT(m1 == m2);
@@ -1243,7 +1271,8 @@ TEST_CASE(simplify_sub_neg_zero_const)
     migraphx::module m2;
     {
         auto x  = m2.add_parameter("x", {migraphx::shape::int32_type, {1}});
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
     }
     EXPECT(m1 == m2);
 }
@@ -1265,7 +1294,8 @@ TEST_CASE(simplify_sub_neg_zero_const_vec)
     migraphx::module m2;
     {
         auto x  = m2.add_parameter("x", x_shape);
-        m2.add_instruction(migraphx::make_op("neg"), x);
+        auto x2 = m2.add_instruction(migraphx::make_op("neg"), x);
+        m2.add_instruction(migraphx::make_op("identity"), x2);
     }
 
     EXPECT(m1 == m2);