Fix dangling reference with gemm add fusion (#1233)

src/targets/gpu/fuse_ops.cpp

@@ -965,7 +965,7 @@ struct find_gemm_pointwise
         inputs.pop_back();
 
         inputs.push_back(c_ins);
-        inputs.push_back(gemm_ins->inputs().back());
+        inputs.push_back(ins->inputs().back());
 
         gemm.beta = 1;
         m.replace_instruction(ins, gemm, inputs);

test/verify/gemm_add.cpp

+
+#include "verify_program.hpp"
+#include <migraphx/program.hpp>
+#include <migraphx/generate.hpp>
+#include <migraphx/make_op.hpp>
+#include <migraphx/apply_alpha_beta.hpp>
+struct gemm_add : verify_program<gemm_add>
+{
+    migraphx::program create_program() const
+    {
+        migraphx::program p;
+        auto* mm = p.get_main_module();
+        migraphx::shape m1_shape{migraphx::shape::float_type, {1, 2, 3}};
+        migraphx::shape m2_shape{migraphx::shape::float_type, {1, 3, 4}};
+        migraphx::shape m3_shape{migraphx::shape::float_type, {1, 2, 4}};
+        auto l1 = mm->add_parameter("1", m1_shape);
+        auto l2 = mm->add_parameter("2", m2_shape);
+        auto l3 = mm->add_parameter("3", m3_shape);
+
+        auto dot = mm->add_instruction(migraphx::make_op("dot"), l1, l2);
+        mm->add_instruction(migraphx::make_op("add"), dot, l3);
+        return p;
+    }
+};