From eb3fd68203fee7c63245c702914c2acd3332d65a Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Thu, 22 Sep 2022 11:29:07 -0700
Subject: Initial commit.

---
 inst.h | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 inst.h

(limited to 'inst.h')

diff --git a/inst.h b/inst.h
new file mode 100644
index 0000000..15ae9d7
--- /dev/null
+++ b/inst.h
@@ -0,0 +1,56 @@
+#pragma once
+
+#include <cstdint>
+
+#include "infra/pipetrace.h"
+
+struct inst {
+    infra::transaction transaction;
+    unsigned int generation;
+    unsigned int size = 0;
+    std::uint64_t linear_next_pc;
+    std::optional<std::uint64_t> predicted_next_pc;
+    std::uint64_t field[4] = {};
+    std::optional<std::uint64_t> result;
+};
+
+constexpr unsigned int OPCODE = 0;
+constexpr unsigned int FLAGS_DST = 1;
+constexpr unsigned int SRC1 = 2;
+constexpr unsigned int SRC2 = 3;
+
+constexpr std::uint64_t FLAG_IMM1 = 1 << 4;
+constexpr std::uint64_t FLAG_IMM2 = 1 << 5;
+
+enum {
+    OP_JUMP_ABS_IF_ZERO,
+    OP_JUMP_ABS_IF_NONZERO,
+    OP_EMIT,
+    OP_ADD,
+    OP_LOAD,
+    OP_STORE,
+};
+
+struct decodebyte {
+    std::uint8_t bits:4;
+    std::uint8_t field:2;
+    std::uint8_t invert:1;
+    std::uint8_t hold:1;
+} __attribute__((packed));
+
+// 0x - shift opcode and issue
+// 1x - shift flagsdst and issue
+// 2x - shift src1 and issue
+// 3x - shift src2 and issue
+// 4x - invert+shift opcode and issue
+// 5x - invert+shift flagsdst and issue
+// 6x - invert+shift src1 and issue
+// 7x - invert+shift src2 and issue
+// 8x - shift opcode
+// 9x - shift flagsdst
+// Ax - shift src1
+// Bx - shift src2
+// Cx - invert+shift opcode
+// Dx - invert+shift flagsdst
+// Ex - invert+shift src1
+// Fx - invert+shift src2
-- 
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