+
+TEST_F(register_coalesce_test, test_dp4_mrf)
+{
+ src_reg some_src_1 = src_reg(v, glsl_type::vec4_type);
+ src_reg some_src_2 = src_reg(v, glsl_type::vec4_type);
+ dst_reg init;
+
+ dst_reg m0 = dst_reg(MRF, 0);
+ m0.writemask = WRITEMASK_Y;
+ m0.type = BRW_REGISTER_TYPE_F;
+
+ dst_reg temp = dst_reg(v, glsl_type::float_type);
+
+ vec4_instruction *dp4 = v->emit(v->DP4(temp, some_src_1, some_src_2));
+ v->emit(v->MOV(m0, src_reg(temp)));
+
+ register_coalesce(v);
+
+ EXPECT_EQ(dp4->dst.file, MRF);
+ EXPECT_EQ(dp4->dst.writemask, WRITEMASK_Y);
+}
+
+TEST_F(register_coalesce_test, test_dp4_grf)
+{
+ src_reg some_src_1 = src_reg(v, glsl_type::vec4_type);
+ src_reg some_src_2 = src_reg(v, glsl_type::vec4_type);
+ dst_reg init;
+
+ dst_reg to = dst_reg(v, glsl_type::vec4_type);
+ dst_reg temp = dst_reg(v, glsl_type::float_type);
+
+ vec4_instruction *dp4 = v->emit(v->DP4(temp, some_src_1, some_src_2));
+ to.writemask = WRITEMASK_Y;
+ v->emit(v->MOV(to, src_reg(temp)));
+
+ /* if we don't do something with the result, the automatic dead code
+ * elimination will remove all our instructions.
+ */
+ src_reg src = src_reg(to);
+ src.negate = true;
+ v->emit(v->MOV(dst_reg(MRF, 0), src));
+
+ register_coalesce(v);
+
+ EXPECT_EQ(dp4->dst.nr, to.nr);
+ EXPECT_EQ(dp4->dst.writemask, WRITEMASK_Y);
+}
+
+TEST_F(register_coalesce_test, test_channel_mul_grf)
+{
+ src_reg some_src_1 = src_reg(v, glsl_type::vec4_type);
+ src_reg some_src_2 = src_reg(v, glsl_type::vec4_type);
+ dst_reg init;
+
+ dst_reg to = dst_reg(v, glsl_type::vec4_type);
+ dst_reg temp = dst_reg(v, glsl_type::float_type);
+
+ vec4_instruction *mul = v->emit(v->MUL(temp, some_src_1, some_src_2));
+ to.writemask = WRITEMASK_Y;
+ v->emit(v->MOV(to, src_reg(temp)));
+
+ /* if we don't do something with the result, the automatic dead code
+ * elimination will remove all our instructions.
+ */
+ src_reg src = src_reg(to);
+ src.negate = true;
+ v->emit(v->MOV(dst_reg(MRF, 0), src));
+
+ register_coalesce(v);
+
+ EXPECT_EQ(mul->dst.nr, to.nr);
+}