diff --git a/src/intel/compiler/meson.build b/src/intel/compiler/meson.build
index 0c9d0c215a3..32297306f19 100644
--- a/src/intel/compiler/meson.build
+++ b/src/intel/compiler/meson.build
@@ -218,6 +218,7 @@ if with_tests
         'test_opt_combine_constants.cpp',
         'test_opt_copy_propagation.cpp',
         'test_opt_cse.cpp',
+        'test_opt_register_coalesce.cpp',
         'test_opt_saturate_propagation.cpp',
         'test_simd_selection.cpp',
         'test_vf_float_conversions.cpp',
diff --git a/src/intel/compiler/test_opt_register_coalesce.cpp b/src/intel/compiler/test_opt_register_coalesce.cpp
new file mode 100644
index 00000000000..840ef10c0ce
--- /dev/null
+++ b/src/intel/compiler/test_opt_register_coalesce.cpp
@@ -0,0 +1,86 @@
+/*
+ * Copyright © 2025 Intel Corporation
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "test_helpers.h"
+#include "brw_builder.h"
+
+class RegisterCoalesceTest : public brw_shader_pass_test {};
+
+TEST_F(RegisterCoalesceTest, BasicMov)
+{
+   brw_builder bld = make_shader();
+   brw_builder exp = make_shader();
+
+   brw_reg a = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg b = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg c = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg i = brw_imm_f(42.0);
+
+   brw_reg x = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg y = vgrf(bld, exp, BRW_TYPE_F);
+
+   bld.ADD(x, a, b);
+   bld.MOV(y, x);
+   bld.MUL(c, y, i);
+
+   EXPECT_PROGRESS(brw_opt_register_coalesce, bld);
+
+   exp.ADD(x, a, b);
+   exp.MUL(c, x, i);
+
+   EXPECT_SHADERS_MATCH(bld, exp);
+}
+
+TEST_F(RegisterCoalesceTest, RegistersInterfere)
+{
+   brw_builder bld = make_shader();
+
+   brw_reg a = vgrf(bld, BRW_TYPE_F);
+   brw_reg b = vgrf(bld, BRW_TYPE_F);
+   brw_reg c = vgrf(bld, BRW_TYPE_F);
+   brw_reg d = vgrf(bld, BRW_TYPE_F);
+   brw_reg i = brw_imm_f(42.0);
+
+   brw_reg x = vgrf(bld, BRW_TYPE_F);
+   brw_reg y = vgrf(bld, BRW_TYPE_F);
+
+   bld.ADD(x, a, b);
+   bld.MOV(y, x);
+   bld.ADD(x, x, x);
+   bld.MUL(c, y, i);
+   bld.ADD(d, y, y);
+
+   EXPECT_NO_PROGRESS(brw_opt_register_coalesce, bld);
+}
+
+TEST_F(RegisterCoalesceTest, InterfereButContainEachOther)
+{
+   brw_builder bld = make_shader();
+   brw_builder exp = make_shader();
+
+   brw_reg a = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg b = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg c = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg d = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg e = vgrf(bld, exp, BRW_TYPE_F);
+
+   brw_reg x = vgrf(bld, exp, BRW_TYPE_F);
+   brw_reg y = vgrf(bld, exp, BRW_TYPE_F);
+
+   bld.MUL(x, a, b);
+   bld.ADD(c, x, x);
+   bld.ADD(d, x, x);
+   bld.MOV(y, x);
+   bld.ADD(e, x, y);
+
+   EXPECT_PROGRESS(brw_opt_register_coalesce, bld);
+
+   exp.MUL(x, a, b);
+   exp.ADD(c, x, x);
+   exp.ADD(d, x, x);
+   exp.ADD(e, x, x);
+
+   EXPECT_SHADERS_MATCH(bld, exp);
+}