The instruction DINS may be transformed into DINSU or DEXTM depending

on the size of the extraction and its position in the 64 bit word.

This patch allows support of the dext transformations with mips64 direct
object output.

0 <= msb < 32 0 <= lsb < 32 0 <= pos < 32 1 <= size <= 32
DINS
The field is entirely contained in the right-most word of the doubleword

32 <= msb < 64 0 <= lsb < 32 0 <= pos < 32 2 <= size <= 64
DINSM
The field straddles the words of the doubleword

32 <= msb < 64 32 <= lsb < 64 32 <= pos < 64 1 <= size <= 32
DINSU
The field is entirely contained in the left-most word of the doubleword



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163010 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/Mips64InstrInfo.td

@@ -222,6 +222,10 @@ let Pattern = []<dag> in {
   def DEXTM : ExtBase<1, "dextm", CPU64Regs>;
 }
 def DINS : InsBase<7, "dins", CPU64Regs>;
+let Pattern = []<dag> in {
+  def DINSU : InsBase<6, "dinsu", CPU64Regs>;
+  def DINSM : InsBase<5, "dinsm", CPU64Regs>;
+}
 
 let isCodeGenOnly = 1, rs = 0, shamt = 0 in {
   def DSLL64_32 : FR<0x00, 0x3c, (outs CPU64Regs:$rd), (ins CPURegs:$rt),

lib/Target/Mips/MipsAsmPrinter.cpp

@@ -86,11 +86,11 @@ void MipsAsmPrinter::EmitInstruction(const MachineInstr *MI) {
       break;
       // Double extract instruction is chosen by pos and size operands
       case Mips::DEXT:
-        assert(Subtarget->hasMips64() &&
-                    "DEXT is a MIPS64 instruction");
+      case Mips::DINS:
+        assert(Subtarget->hasMips64() && "DEXT/DINS are MIPS64 instructions");
         {
           MCInst TmpInst0;
-          MCInstLowering.LowerDEXT(I, TmpInst0);
+          MCInstLowering.LowerDextDins(I, TmpInst0);
           OutStreamer.EmitInstruction(TmpInst0);
           return;
         }

lib/Target/Mips/MipsMCInstLower.cpp

@@ -11,7 +11,6 @@
 // MCInst records.
 //
 //===----------------------------------------------------------------------===//
-
 #include "MipsMCInstLower.h"
 #include "MipsAsmPrinter.h"
 #include "MipsInstrInfo.h"
@@ -190,10 +189,17 @@ void MipsMCInstLower::LowerLargeShift(const MachineInstr *MI,
   }
 }
 
-// Pick a DEXT instruction variant based on the pos and size operands
-void MipsMCInstLower::LowerDEXT(const MachineInstr *MI,  MCInst& Inst) {
+// Pick a DEXT or DINS instruction variant based on the pos and size operands
+void MipsMCInstLower::LowerDextDins(const MachineInstr *MI,  MCInst& Inst) {
+  int Opcode = MI->getOpcode();
+
+  if (Opcode == Mips::DEXT)
+    assert(MI->getNumOperands() == 4 &&
+           "Invalid no. of machine operands for DEXT!");
+  else // Only DEXT and DINS are possible
+    assert(MI->getNumOperands() == 5 &&
+           "Invalid no. of machine operands for DINS!");
 
-  assert(MI->getNumOperands() == 4 && "Invalid no. of machine operands for DEXT!");
   assert(MI->getOperand(2).isImm());
   int64_t pos = MI->getOperand(2).getImm();
   assert(MI->getOperand(3).isImm());
@@ -204,23 +210,21 @@ void MipsMCInstLower::LowerDEXT(const MachineInstr *MI,  MCInst& Inst) {
   // rs
   Inst.addOperand(LowerOperand(MI->getOperand(1)));
 
-  // DEXT
-  if ((pos < 32) && (size <= 32)) {
-    Inst.addOperand(MCOperand::CreateImm(pos));
-    Inst.addOperand(MCOperand::CreateImm(size));
-    Inst.setOpcode(Mips::DEXT);
-  }
-  // DEXTU
-  else if ((pos < 64) && (size <= 32)) {
-    Inst.addOperand(MCOperand::CreateImm(pos - 32));
-    Inst.addOperand(MCOperand::CreateImm(size));
-    Inst.setOpcode(Mips::DEXTU);
-  }
-  // DEXTM
-  else {
+  if (size <= 32) {
+    if ((pos < 32)) { // DEXT/DINS
+      Inst.addOperand(MCOperand::CreateImm(pos));
+      Inst.addOperand(MCOperand::CreateImm(size));
+      Inst.setOpcode(Opcode);
+    } else { // DEXTU/DINSU
+      Inst.addOperand(MCOperand::CreateImm(pos - 32));
+      Inst.addOperand(MCOperand::CreateImm(size));
+      Inst.setOpcode((Opcode == Mips::DEXT) ? Mips::DEXTU : Mips::DINSU);
+    }
+  } else { // DEXTM/DINSM
+    assert(pos < 32 && "DEXT/DINS cannot have both size and pos > 32");
     Inst.addOperand(MCOperand::CreateImm(pos));
     Inst.addOperand(MCOperand::CreateImm(size - 32));
     Inst.setOpcode(Mips::DEXTM);
+    Inst.setOpcode((Opcode == Mips::DEXT) ? Mips::DEXTM : Mips::DINSM);
   }
-  return;
 }

lib/Target/Mips/MipsMCInstLower.h

@@ -34,7 +34,7 @@ public:
   void Initialize(Mangler *mang, MCContext *C);
   void Lower(const MachineInstr *MI, MCInst &OutMI) const;
   void LowerLargeShift(const MachineInstr *MI, MCInst &Inst, int64_t Shift);
-  void LowerDEXT(const MachineInstr *MI, MCInst &Inst);
+  void LowerDextDins(const MachineInstr *MI, MCInst &Inst);
 
 private:
   MCOperand LowerSymbolOperand(const MachineOperand &MO,

test/MC/Mips/mips64extins.ll

@@ -26,3 +26,32 @@ entry:
   ret i64 %and
 }
 
+define i64 @dins(i64 %i, i64 %j) nounwind readnone {
+entry:
+; CHECK: dins ${{[0-9]+}}, ${{[0-9]+}}, 8, 10
+  %shl2 = shl i64 %j, 8
+  %and = and i64 %shl2, 261888
+  %and3 = and i64 %i, -261889
+  %or = or i64 %and3, %and
+  ret i64 %or
+}
+
+define i64 @dinsm(i64 %i, i64 %j) nounwind readnone {
+entry:
+; CHECK: dinsm ${{[0-9]+}}, ${{[0-9]+}}, 10, 1
+  %shl4 = shl i64 %j, 10
+  %and = and i64 %shl4, 8796093021184
+  %and5 = and i64 %i, -8796093021185
+  %or = or i64 %and5, %and
+  ret i64 %or
+}
+
+define i64 @dinsu(i64 %i, i64 %j) nounwind readnone {
+entry:
+; CHECK: dinsu ${{[0-9]+}}, ${{[0-9]+}}, 8, 13
+  %shl4 = shl i64 %j, 40
+  %and = and i64 %shl4, 9006099743113216
+  %and5 = and i64 %i, -9006099743113217
+  %or = or i64 %and5, %and
+  ret i64 %or
+}