1 files changed, 71 insertions, 0 deletions

diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_multi_function.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_multi_function.cpp
new file mode 100644
index 000000000..e2ab0dab2
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_multi_function.cpp
@@ -0,0 +1,71 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "shader_recompiler/exception.h"
+#include "shader_recompiler/frontend/maxwell/opcode.h"
+#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
+
+namespace Shader::Maxwell {
+namespace {
+enum class Operation {
+    Cos = 0,
+    Sin = 1,
+    Ex2 = 2,    // Base 2 exponent
+    Lg2 = 3,    // Base 2 logarithm
+    Rcp = 4,    // Reciprocal
+    Rsq = 5,    // Reciprocal square root
+    Rcp64H = 6, // 64-bit reciprocal
+    Rsq64H = 7, // 64-bit reciprocal square root
+    Sqrt = 8,
+};
+} // Anonymous namespace
+
+void TranslatorVisitor::MUFU(u64 insn) {
+    // MUFU is used to implement a bunch of special functions. See Operation.
+    union {
+        u64 raw;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<8, 8, IR::Reg> src_reg;
+        BitField<20, 4, Operation> operation;
+        BitField<46, 1, u64> abs;
+        BitField<48, 1, u64> neg;
+        BitField<50, 1, u64> sat;
+    } const mufu{insn};
+
+    const IR::U32 op_a{ir.FPAbsNeg(X(mufu.src_reg), mufu.abs != 0, mufu.neg != 0)};
+    IR::U32 value{[&]() -> IR::U32 {
+        switch (mufu.operation) {
+        case Operation::Cos:
+            return ir.FPCosNotReduced(op_a);
+        case Operation::Sin:
+            return ir.FPSinNotReduced(op_a);
+        case Operation::Ex2:
+            return ir.FPExp2NotReduced(op_a);
+        case Operation::Lg2:
+            return ir.FPLog2(op_a);
+        case Operation::Rcp:
+            return ir.FPRecip(op_a);
+        case Operation::Rsq:
+            return ir.FPRecipSqrt(op_a);
+        case Operation::Rcp64H:
+            throw NotImplementedException("MUFU.RCP64H");
+        case Operation::Rsq64H:
+            throw NotImplementedException("MUFU.RSQ64H");
+        case Operation::Sqrt:
+            return ir.FPSqrt(op_a);
+        default:
+            throw NotImplementedException("Invalid MUFU operation {}", mufu.operation.Value());
+        }
+    }()};
+
+    if (mufu.sat) {
+        value = ir.FPSaturate(value);
+    }
+
+    X(mufu.dest_reg, value);
+}
+
+} // namespace Shader::Maxwell