[PPC][BOLT] Port createPushRegisters for PowerPC

Author: kostasalv

bolt/lib/Target/PowerPC/PPCMCPlusBuilder.cpp

@@ -9,3 +9,36 @@
 // This file provides PowerPC-specific MCPlus builder.
 //
 //===----------------------------------------------------------------------===//
+
+#include "bolt/Core/MCPlusBuilder.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCPhysReg.h"
+#include "llvm/Target/PowerPC/PPCInstrInfo.h"
+#include "llvm/Target/PowerPC/PPCRegisterInfo.h"
+
+namespace llvm {
+namespace bolt {
+
+class PPCMCPlusBuilder : public MCPlusBuilder{
+public:
+    using MCPlusBuilder::MCPlusBuilder;
+
+    // Create instructions to push two registers onto the stack
+    static void createPushRegisters(MCInst &Inst1, MCInst &Inst2, MCPhysReg Reg1, MCPhysReg /*Reg2*/){
+
+        Inst1.clear();
+        Inst1.setOpcode(PPC::STDU);
+        Inst1.addOperand(MCOperand::createReg(PPC::R1)); // destination (SP)
+        Inst1.addOperand(MCOperand::createReg(PPC::R1)); // base (SP)
+        Inst1.addOperand(MCOperand::createImm(-16));     // offset
+
+        Inst2.clear();
+        Inst2.setOpcode(PPC::STD);
+        Inst2.addOperand(MCOperand::createReg(Reg1));     // source register
+        Inst2.addOperand(MCOperand::createReg(PPC::R1));  // base (SP)
+        Inst2.addOperand(MCOperand::createImm(0));        // offset
+    }
+};
+
+} // namespace bolt
+} // namespace llvm

bolt/lib/Target/PowerPC/PPCMCSymbolizer.cpp

@@ -0,0 +1,7 @@
+//===- bolt/Target/PowerPC/PPCMCSymbolizer.cpp ------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//

bolt/lib/Target/PowerPC/PPCMCSymbolizer.h

@@ -0,0 +1,7 @@
+//===- bolt/Target/PowerPC/PPCMCSymbolizer.cpp --------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//