From 83338a2f753ebbb7ba7b154cc60b2f427b6121b0 Mon Sep 17 00:00:00 2001
From: Sebastiano Tronto <sebastiano@tronto.net>
Date: Wed, 26 Mar 2025 19:22:50 +0100
Subject: Added inverse coordinate for CO

this is necessary for DR coordinate
---
 src/arch/neon.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

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

diff --git a/src/arch/neon.h b/src/arch/neon.h
index d5f5f8b..fc0e612 100644
--- a/src/arch/neon.h
+++ b/src/arch/neon.h
@@ -219,6 +219,25 @@ coord_co(cube_t c)
 	return ret;
 }
 
+STATIC_INLINE cube_t
+invcoord_co(int64_t coord)
+{
+	int64_t co, c, i, p;
+	uint8_t mem[8];
+	cube_t cube;
+
+	for (i = 0, p = 0, c = coord; i < 8; i++, c /= 3) {
+		co = i == 7 ? ((3 - (p % 3)) % 3) : (c % 3);
+		p += co;
+		mem[i] = i + (co << COSHIFT);
+	}
+
+	cube.corner = vld1_u8(mem);
+	cube.edge = SOLVED_CUBE.edge;
+
+	return cube;
+}
+
 STATIC_INLINE int64_t
 coord_csep(cube_t c)
 {
-- 
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