From 3db2b3effa953ae66457b7a19b419fc4db2c4801 Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Sun, 11 Apr 2021 02:07:02 -0400
Subject: shader: Implement ATOM/S and RED

---
 .../impl/atomic_operations_shared_memory.cpp       | 110 +++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 src/shader_recompiler/frontend/maxwell/translate/impl/atomic_operations_shared_memory.cpp

(limited to 'src/shader_recompiler/frontend/maxwell/translate/impl/atomic_operations_shared_memory.cpp')

diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/atomic_operations_shared_memory.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/atomic_operations_shared_memory.cpp
new file mode 100644
index 000000000..8b974621e
--- /dev/null
+++ b/src/shader_recompiler/frontend/maxwell/translate/impl/atomic_operations_shared_memory.cpp
@@ -0,0 +1,110 @@
+// 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/frontend/maxwell/translate/impl/impl.h"
+
+namespace Shader::Maxwell {
+namespace {
+enum class AtomOp : u64 {
+    ADD,
+    MIN,
+    MAX,
+    INC,
+    DEC,
+    AND,
+    OR,
+    XOR,
+    EXCH,
+};
+
+enum class AtomsSize : u64 {
+    U32,
+    S32,
+    U64,
+};
+
+IR::U32U64 ApplyAtomsOp(IR::IREmitter& ir, const IR::U32& offset, const IR::U32U64& op_b, AtomOp op,
+                        bool is_signed) {
+    switch (op) {
+    case AtomOp::ADD:
+        return ir.SharedAtomicIAdd(offset, op_b);
+    case AtomOp::MIN:
+        return ir.SharedAtomicIMin(offset, op_b, is_signed);
+    case AtomOp::MAX:
+        return ir.SharedAtomicIMax(offset, op_b, is_signed);
+    case AtomOp::INC:
+        return ir.SharedAtomicInc(offset, op_b);
+    case AtomOp::DEC:
+        return ir.SharedAtomicDec(offset, op_b);
+    case AtomOp::AND:
+        return ir.SharedAtomicAnd(offset, op_b);
+    case AtomOp::OR:
+        return ir.SharedAtomicOr(offset, op_b);
+    case AtomOp::XOR:
+        return ir.SharedAtomicXor(offset, op_b);
+    case AtomOp::EXCH:
+        return ir.SharedAtomicExchange(offset, op_b);
+    default:
+        throw NotImplementedException("Integer Atoms Operation {}", op);
+    }
+}
+
+IR::U32 AtomsOffset(TranslatorVisitor& v, u64 insn) {
+    union {
+        u64 raw;
+        BitField<8, 8, IR::Reg> offset_reg;
+        BitField<30, 22, u64> absolute_offset;
+        BitField<30, 22, s64> relative_offset;
+    } const encoding{insn};
+
+    if (encoding.offset_reg == IR::Reg::RZ) {
+        return v.ir.Imm32(static_cast<u32>(encoding.absolute_offset << 2));
+    } else {
+        const s32 relative{static_cast<s32>(encoding.relative_offset << 2)};
+        return v.ir.IAdd(v.X(encoding.offset_reg), v.ir.Imm32(relative));
+    }
+}
+
+void StoreResult(TranslatorVisitor& v, IR::Reg dest_reg, const IR::Value& result, AtomsSize size) {
+    switch (size) {
+    case AtomsSize::U32:
+    case AtomsSize::S32:
+        return v.X(dest_reg, IR::U32{result});
+    case AtomsSize::U64:
+        return v.L(dest_reg, IR::U64{result});
+    default:
+        break;
+    }
+}
+} // Anonymous namespace
+
+void TranslatorVisitor::ATOMS(u64 insn) {
+    union {
+        u64 raw;
+        BitField<0, 8, IR::Reg> dest_reg;
+        BitField<8, 8, IR::Reg> addr_reg;
+        BitField<20, 8, IR::Reg> src_reg_b;
+        BitField<28, 2, AtomsSize> size;
+        BitField<52, 4, AtomOp> op;
+    } const atoms{insn};
+
+    const bool size_64{atoms.size == AtomsSize::U64};
+    if (size_64 && atoms.op != AtomOp::EXCH) {
+        throw NotImplementedException("64-bit Atoms Operation {}", atoms.op.Value());
+    }
+    const bool is_signed{atoms.size == AtomsSize::S32};
+    const IR::U32 offset{AtomsOffset(*this, insn)};
+
+    IR::Value result;
+    if (size_64) {
+        result = ApplyAtomsOp(ir, offset, L(atoms.src_reg_b), atoms.op, is_signed);
+    } else {
+        result = ApplyAtomsOp(ir, offset, X(atoms.src_reg_b), atoms.op, is_signed);
+    }
+    StoreResult(*this, atoms.dest_reg, result, atoms.size);
+}
+
+} // namespace Shader::Maxwell
-- 
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