From 80d78c5589d42f81b04e671b28c103a2112458d1 Mon Sep 17 00:00:00 2001
From: Kimplul <kimi.h.kuparinen@gmail.com>
Date: Sun, 29 Oct 2023 13:16:25 +0200
Subject: move common stuff to core

+ Might have to come up with a better name, but works for now
---
 core/bits.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 core/bits.c

(limited to 'core/bits.c')

diff --git a/core/bits.c b/core/bits.c
new file mode 100644
index 0000000..cfe0f20
--- /dev/null
+++ b/core/bits.c
@@ -0,0 +1,75 @@
+#include <bits.h>
+
+tri_t parse_opcode(tri_t i)
+{
+	/* opcode is lowest five trits */
+	return tri_mask(i, 5);
+}
+
+tri_t build_r(tri_t opcode, tri_t rd, tri_t fn0, tri_t rs1, tri_t rs2, tri_t fn5)
+{
+	return opcode
+		| tri_sl(rd ,  5)
+		| tri_sl(fn0,  9)
+		| tri_sl(rs1, 14)
+		| tri_sl(rs2, 18)
+		| tri_sl(fn5, 22);
+}
+
+void parse_r(tri_t i, tri_t *rd, tri_t *fn0, tri_t *rs1, tri_t *rs2, tri_t *fn5)
+{
+	*rd  = tri_mask(tri_sr(i,  5), 4);
+	*fn0 = tri_mask(tri_sr(i,  9), 5);
+	*rs1 = tri_mask(tri_sr(i, 14), 4);
+	*rs2 = tri_mask(tri_sr(i, 18), 4);
+	*fn5 = tri_mask(tri_sr(i, 22), 5);
+}
+
+tri_t build_i(tri_t opcode, tri_t rd, tri_t fn0, tri_t rs1, tri_t imm9)
+{
+	return opcode
+		| tri_sl(rd  ,  5)
+		| tri_sl(fn0 ,  9)
+		| tri_sl(rs1 , 14)
+		| tri_sl(imm9, 18);
+}
+
+void parse_i(tri_t i, tri_t *rd, tri_t *fn0, tri_t *rs1, tri_t *imm9)
+{
+	*rd   = tri_mask(tri_sr(i,  5), 4);
+	*fn0  = tri_mask(tri_sr(i,  9), 5);
+	*rs1  = tri_mask(tri_sr(i, 14), 4);
+	*imm9 = tri_mask(tri_sr(i, 18), 9);
+}
+
+tri_t build_s(tri_t opcode, tri_t imm4, tri_t fn0, tri_t rs1, tri_t rs2, tri_t imm5)
+{
+	return opcode
+		| tri_sl(imm4,  5)
+		| tri_sl(fn0 ,  9)
+		| tri_sl(rs1 , 14)
+		| tri_sl(rs2 , 18)
+		| tri_sl(imm5, 22);
+}
+
+void parse_s(tri_t i, tri_t *imm4, tri_t *fn0, tri_t *rs1, tri_t *rs2, tri_t *imm5)
+{
+	*imm4 = tri_mask(tri_sr(i,  5), 4);
+	*fn0  = tri_mask(tri_sr(i,  9), 5);
+	*rs1  = tri_mask(tri_sr(i, 14), 4);
+	*rs2  = tri_mask(tri_sr(i, 18), 4);
+	*imm5 = tri_mask(tri_sr(i, 22), 5);
+}
+
+tri_t build_u(tri_t opcode, tri_t rd, tri_t imm18)
+{
+	return opcode
+		| tri_sl(rd   , 5)
+		| tri_sl(imm18, 9);
+}
+
+void parse_u(tri_t i, tri_t *rd, tri_t *imm18)
+{
+	*rd    = tri_mask(tri_sr(i, 5),  4);
+	*imm18 = tri_mask(tri_sr(i, 9), 18);
+}
-- 
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