diff --git a/include/cglm/simd/arm.h b/include/cglm/simd/arm.h
index e943ce3..d0c4bc3 100644
--- a/include/cglm/simd/arm.h
+++ b/include/cglm/simd/arm.h
@@ -29,6 +29,15 @@
   vreinterpretq_f32_s32(veorq_s32(vreinterpretq_s32_f32(a),                   \
                                   vreinterpretq_s32_f32(b)))
 
+#define glmm_swplane(v) vextq_f32(v, v, 2)
+#define glmm_low(x)     vget_low_f32(x)
+#define glmm_high(x)    vget_high_f32(x)
+
+#define glmm_combine_ll(x, y) vcombine_f32(vget_low_f32(x),  vget_low_f32(y))
+#define glmm_combine_hl(x, y) vcombine_f32(vget_high_f32(x), vget_low_f32(y))
+#define glmm_combine_lh(x, y) vcombine_f32(vget_low_f32(x),  vget_high_f32(y))
+#define glmm_combine_hh(x, y) vcombine_f32(vget_high_f32(x), vget_high_f32(y))
+
 static inline
 float32x4_t
 glmm_abs(float32x4_t v) {