video_core: Implement basic compute shaders and more instructions

src/shader_recompiler/ir/passes/identity_removal_pass.cpp

@@ -0,0 +1,34 @@
+// SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <vector>
+#include "shader_recompiler/ir/program.h"
+
+namespace Shader::Optimization {
+
+void IdentityRemovalPass(IR::BlockList& program) {
+    std::vector<IR::Inst*> to_invalidate;
+    for (IR::Block* const block : program) {
+        for (auto inst = block->begin(); inst != block->end();) {
+            const size_t num_args{inst->NumArgs()};
+            for (size_t i = 0; i < num_args; ++i) {
+                IR::Value arg;
+                while ((arg = inst->Arg(i)).IsIdentity()) {
+                    inst->SetArg(i, arg.Inst()->Arg(0));
+                }
+            }
+            if (inst->GetOpcode() == IR::Opcode::Identity ||
+                inst->GetOpcode() == IR::Opcode::Void) {
+                to_invalidate.push_back(&*inst);
+                inst = block->Instructions().erase(inst);
+            } else {
+                ++inst;
+            }
+        }
+    }
+    for (IR::Inst* const inst : to_invalidate) {
+        inst->Invalidate();
+    }
+}
+
+} // namespace Shader::Optimization