arm, neon: util macros
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) {
