From 2add5df6e7f028e9edafecca7953505b52d73253 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Sun, 8 Apr 2018 13:44:03 +0200
Subject: Implement LUI

---
 qtmips_machine/alu.cpp            | 2 ++
 qtmips_machine/alu.h              | 1 +
 qtmips_machine/core.cpp           | 2 +-
 qtmips_machine/tests/testcore.cpp | 4 ++++
 4 files changed, 8 insertions(+), 1 deletion(-)

(limited to 'qtmips_machine')

diff --git a/qtmips_machine/alu.cpp b/qtmips_machine/alu.cpp
index 24b1c02..3822955 100644
--- a/qtmips_machine/alu.cpp
+++ b/qtmips_machine/alu.cpp
@@ -65,6 +65,8 @@ std::uint32_t machine::alu_operate(enum AluOp operation, std::uint32_t s, std::u
             return ((std::int32_t)s < (std::int32_t)t) ? 1 : 0;
         case ALU_OP_SLTU:
             return (s < t) ? 1 : 0;
+        case ALU_OP_LUI:
+            return t << 16;
         default:
             throw QTMIPS_EXCEPTION(UnsupportedAluOperation, "Unknown ALU operation", QString::number(operation, 16));
     }
diff --git a/qtmips_machine/alu.h b/qtmips_machine/alu.h
index 13f3d89..786bba0 100644
--- a/qtmips_machine/alu.h
+++ b/qtmips_machine/alu.h
@@ -33,6 +33,7 @@ enum AluOp : std::uint8_t {
     ALU_OP_NOR,
     ALU_OP_SLT = 42,
     ALU_OP_SLTU,
+    ALU_OP_LUI, // We don't care about exact index for this one
     ALU_OP_LAST = 64 // First impossible operation (just to be sure that we don't overflow)
 };
 
diff --git a/qtmips_machine/core.cpp b/qtmips_machine/core.cpp
index 617f8c2..1e31584 100644
--- a/qtmips_machine/core.cpp
+++ b/qtmips_machine/core.cpp
@@ -39,7 +39,7 @@ static const struct DecodeMap dmap[]  = {
     { .flags = FLAGS_ALU_I, .alu = ALU_OP_AND, NOMEM }, // ANDI
     { .flags = FLAGS_ALU_I, .alu = ALU_OP_OR, NOMEM }, // ORI
     { .flags = FLAGS_ALU_I, .alu = ALU_OP_XOR, NOMEM }, // XORI
-    NOPE, // LUI
+    { .flags = FLAGS_ALU_I, .alu = ALU_OP_LUI, NOMEM}, // LUI
     NOPE, // 16
     NOPE, // 17
     NOPE, // 18
diff --git a/qtmips_machine/tests/testcore.cpp b/qtmips_machine/tests/testcore.cpp
index 30cf3c7..5e278b5 100644
--- a/qtmips_machine/tests/testcore.cpp
+++ b/qtmips_machine/tests/testcore.cpp
@@ -122,6 +122,10 @@ static void core_regs_data() {
     QTest::newRow("NOR") << Instruction(0, 24, 25, 26, 0, 39) \
                          << regs_init \
                          << regs_res;
+    regs_res.write_gp(26, 0xf00f0000);
+    QTest::newRow("LUI") << Instruction(15, 0, 26, 0xf00f) \
+                         << regs_init \
+                         << regs_res;
     }
 
     // Move instructions
-- 
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