diff --git a/src/compiler/nir/nir_opt_algebraic.py b/src/compiler/nir/nir_opt_algebraic.py
index 0ac051a8aa3..8dfd33bd739 100644
--- a/src/compiler/nir/nir_opt_algebraic.py
+++ b/src/compiler/nir/nir_opt_algebraic.py
@@ -3130,6 +3130,13 @@ optimizations += [
     ('bcsel', a, ('pack_half_2x16_rtz_split', b, d), ('pack_half_2x16_rtz_split', c, e))),
 
    (('pack_half_2x16_rtz_split', ('b2f', 'a@1'), ('b2f', a)), ('bcsel', a, 0x3c003c00, 0)),
+
+   (('pack_32_2x16_split', 'a(is_undef)', ('bcsel', b, '#c', d)),
+    ('bcsel', b, ('pack_32_2x16_split', 0, c), ('pack_32_2x16_split', a, d)),
+    'true', TestStatus.UNSUPPORTED),
+   (('pack_32_2x16_split', 'a(is_undef)', ('bcsel', b, c, '#d')),
+    ('bcsel', b, ('pack_32_2x16_split', a, c), ('pack_32_2x16_split', 0, d)),
+    'true', TestStatus.UNSUPPORTED),
 ]
 
 # Some operations such as iadd have the property that the bottom N bits of the
diff --git a/src/compiler/nir/nir_search_helpers.h b/src/compiler/nir/nir_search_helpers.h
index 0307a02a30c..1d2340fda24 100644
--- a/src/compiler/nir/nir_search_helpers.h
+++ b/src/compiler/nir/nir_search_helpers.h
@@ -1079,4 +1079,11 @@ is_created_as_float(const nir_search_state *state, const nir_alu_instr *instr, u
    return nir_alu_type_get_base_type(output_type) == nir_type_float;
 }
 
+static inline bool
+is_undef(const nir_search_state *state, const nir_alu_instr *instr, unsigned src,
+         UNUSED unsigned num_components, UNUSED const uint8_t *swizzle)
+{
+   return nir_src_is_undef(instr->src[src].src);
+}
+
 #endif /* _NIR_SEARCH_ */