shader: Initial instruction support

src/shader_recompiler/frontend/ir/modifiers.h

@@ -0,0 +1,28 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace Shader::IR {
+
+enum class FmzMode {
+    None, // Denorms are not flushed, NAN is propagated (nouveau)
+    FTZ,  // Flush denorms to zero, NAN is propagated (D3D11, NVN, GL, VK)
+    FMZ,  // Flush denorms to zero, x * 0 == 0 (D3D9)
+};
+
+enum class FpRounding {
+    RN, // Round to nearest even,
+    RM, // Round towards negative infinity
+    RP, // Round towards positive infinity
+    RZ, // Round towards zero
+};
+
+struct FpControl {
+    bool no_contraction{false};
+    FpRounding rounding : 8 = FpRounding::RN;
+    FmzMode fmz_mode : 8 = FmzMode::FTZ;
+};
+static_assert(sizeof(FpControl) <= sizeof(u64));
+} // namespace Shader::IR