shader: Initial recompiler work

src/shader_recompiler/frontend/maxwell/translate/impl/impl.cpp

@@ -0,0 +1,79 @@
+// 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 "shader_recompiler/frontend/ir/ir_emitter.h"
+#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
+
+namespace Shader::Maxwell {
+
+IR::U32 TranslatorVisitor::X(IR::Reg reg) {
+    return ir.GetReg(reg);
+}
+
+void TranslatorVisitor::X(IR::Reg dest_reg, const IR::U32& value) {
+    ir.SetReg(dest_reg, value);
+}
+
+IR::U32 TranslatorVisitor::GetCbuf(u64 insn) {
+    union {
+        u64 raw;
+        BitField<20, 14, s64> offset;
+        BitField<34, 5, u64> binding;
+    } const cbuf{insn};
+    if (cbuf.binding >= 18) {
+        throw NotImplementedException("Out of bounds constant buffer binding {}", cbuf.binding);
+    }
+    if (cbuf.offset >= 0x10'000 || cbuf.offset < 0) {
+        throw NotImplementedException("Out of bounds constant buffer offset {}", cbuf.offset);
+    }
+    const IR::U32 binding{ir.Imm32(static_cast<u32>(cbuf.binding))};
+    const IR::U32 byte_offset{ir.Imm32(static_cast<u32>(cbuf.offset) * 4)};
+    return ir.GetCbuf(binding, byte_offset);
+}
+
+IR::U32 TranslatorVisitor::GetImm(u64 insn) {
+    union {
+        u64 raw;
+        BitField<20, 19, u64> value;
+        BitField<56, 1, u64> is_negative;
+    } const imm{insn};
+    const s32 positive_value{static_cast<s32>(imm.value)};
+    const s32 value{imm.is_negative != 0 ? -positive_value : positive_value};
+    return ir.Imm32(value);
+}
+
+void TranslatorVisitor::SetZFlag(const IR::U1& value) {
+    ir.SetZFlag(value);
+}
+
+void TranslatorVisitor::SetSFlag(const IR::U1& value) {
+    ir.SetSFlag(value);
+}
+
+void TranslatorVisitor::SetCFlag(const IR::U1& value) {
+    ir.SetCFlag(value);
+}
+
+void TranslatorVisitor::SetOFlag(const IR::U1& value) {
+    ir.SetOFlag(value);
+}
+
+void TranslatorVisitor::ResetZero() {
+    SetZFlag(ir.Imm1(false));
+}
+
+void TranslatorVisitor::ResetSFlag() {
+    SetSFlag(ir.Imm1(false));
+}
+
+void TranslatorVisitor::ResetCFlag() {
+    SetCFlag(ir.Imm1(false));
+}
+
+void TranslatorVisitor::ResetOFlag() {
+    SetOFlag(ir.Imm1(false));
+}
+
+} // namespace Shader::Maxwell