From 7ff76870242b6906b6f3caf22da3c094822ed140 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Fri, 1 Aug 2025 23:32:19 +0200
Subject: Move is_eo_even to more appropriate module

---
 src/arch/neon.h | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

(limited to 'src/arch/neon.h')

diff --git a/src/arch/neon.h b/src/arch/neon.h
index 5723b60..2c35c58 100644
--- a/src/arch/neon.h
+++ b/src/arch/neon.h
@@ -1,5 +1,6 @@
-#define CO2_NEON vdup_n_u8(0x60)
-#define COCW_NEON vdup_n_u8(0x20)
+#define CO2_NEON    vdup_n_u8(0x60)
+#define COCW_NEON   vdup_n_u8(0x20)
+#define EO_NEON     vdupq_n_u8(0x10)
 #define PBITS8_NEON vdup_n_u8(PBITS)
 
 STATIC_INLINE uint8x16_t compose_edges_slim(uint8x16_t, uint8x16_t);
@@ -501,3 +502,16 @@ invcoord_epe(uint64_t i)
 		.edge = vcombine_u8(vld1_u8(SOLVED_L), a)
 	};
 }
+
+STATIC_INLINE bool
+is_eo_even(cube_t cube)
+{
+	int8_t count;
+	uint8x16_t e;
+
+	e = vandq_u8(cube.edge, EO_NEON);
+	e = vshrq_n_u8(e, EOSHIFT);
+	count = vaddvq_u8(e);
+
+	return count % 2 == 0;
+}
-- 
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