add fneg/fabs support for doubles

[oota-llvm.git] / lib / Target / SparcV8 / SparcV8InstrInfo.cpp

diff --git a/lib/Target/SparcV8/SparcV8InstrInfo.cpp b/lib/Target/SparcV8/SparcV8InstrInfo.cpp
index 01c513ac5ed27cacdeb4e1d46bbd991dba8d53e3..d63be35ca7b622d5ab283789fdb2968045486345 100644 (file)
--- a/lib/Target/SparcV8/SparcV8InstrInfo.cpp
+++ b/lib/Target/SparcV8/SparcV8InstrInfo.cpp
@@ -1,10 +1,10 @@
 //===- SparcV8InstrInfo.cpp - SparcV8 Instruction Information ---*- C++ -*-===//
-// 
+//
 //                     The LLVM Compiler Infrastructure
 //
 // This file was developed by the LLVM research group and is distributed under
 // the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+//
 //===----------------------------------------------------------------------===//
 //
 // This file contains the SparcV8 implementation of the TargetInstrInfo class.
@@ -21,16 +21,34 @@ SparcV8InstrInfo::SparcV8InstrInfo()
   : TargetInstrInfo(SparcV8Insts, sizeof(SparcV8Insts)/sizeof(SparcV8Insts[0])){
 }
 
+static bool isZeroImmed (const MachineOperand &op) {
+  return (op.isImmediate() && op.getImmedValue() == 0);
+}
+
 /// Return true if the instruction is a register to register move and
 /// leave the source and dest operands in the passed parameters.
 ///
 bool SparcV8InstrInfo::isMoveInstr(const MachineInstr &MI,
                                    unsigned &SrcReg, unsigned &DstReg) const {
-  if (MI.getOpcode() == V8::ORrr) {
-    if (MI.getOperand(1).getReg() == V8::G0) {  // X = or G0, Y -> X = Y
+  // We look for 3 kinds of patterns here:
+  // or with G0 or 0
+  // add with G0 or 0
+  // fmovs or FpMOVD (pseudo double move).
+  if (MI.getOpcode() == V8::ORrr || MI.getOpcode() == V8::ADDrr) {
+    if (MI.getOperand(1).getReg() == V8::G0) {
       DstReg = MI.getOperand(0).getReg();
       SrcReg = MI.getOperand(2).getReg();
       return true;
+    } else if (MI.getOperand (2).getReg() == V8::G0) {
+      DstReg = MI.getOperand(0).getReg();
+      SrcReg = MI.getOperand(1).getReg();
+      return true;
+    }
+  } else if (MI.getOpcode() == V8::ORri || MI.getOpcode() == V8::ADDri) {
+    if (isZeroImmed(MI.getOperand(2)) && MI.getOperand(1).isRegister()) {
+      DstReg = MI.getOperand(0).getReg();
+      SrcReg = MI.getOperand(1).getReg();
+      return true;
     }
   } else if (MI.getOpcode() == V8::FMOVS || MI.getOpcode() == V8::FpMOVD) {
     SrcReg = MI.getOperand(1).getReg();