[mips] Use TwoOperandAliasConstraint for shift instructions.

This enables TableGen to generate an additional two operand
matcher for our shift_rotate_imm and shift_rotate_reg class of instructions.

The tests were also updated so that they include now encoding information
for all affected instructions.

llvm-svn: 206398

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/lib/Target/Mips/MipsInstrInfo.td b/llvm/lib/Target/Mips/MipsInstrInfo.td
index 6e6c0da002c..acc1946a4c2 100644
--- a/llvm/lib/Target/Mips/MipsInstrInfo.td
+++ b/llvm/lib/Target/Mips/MipsInstrInfo.td
@@ -487,14 +487,18 @@ class shift_rotate_imm<string opstr, Operand ImmOpnd,
                        SDPatternOperator PF = null_frag> :
   InstSE<(outs RO:$rd), (ins RO:$rt, ImmOpnd:$shamt),
          !strconcat(opstr, "\t$rd, $rt, $shamt"),
-         [(set RO:$rd, (OpNode RO:$rt, PF:$shamt))], itin, FrmR, opstr>;
+         [(set RO:$rd, (OpNode RO:$rt, PF:$shamt))], itin, FrmR, opstr> {
+  let TwoOperandAliasConstraint = "$rt = $rd";
+}
 
 class shift_rotate_reg<string opstr, RegisterOperand RO, InstrItinClass itin,
                        SDPatternOperator OpNode = null_frag>:
   InstSE<(outs RO:$rd), (ins RO:$rt, GPR32Opnd:$rs),
          !strconcat(opstr, "\t$rd, $rt, $rs"),
          [(set RO:$rd, (OpNode RO:$rt, GPR32Opnd:$rs))], itin, FrmR,
-         opstr>;
+         opstr> {
+  let TwoOperandAliasConstraint = "$rt = $rd";
+}
 
 // Load Upper Imediate
 class LoadUpper<string opstr, RegisterOperand RO, Operand Imm>: