Index: lib/Target/Mips/Mips64InstrInfo.td
===================================================================
--- lib/Target/Mips/Mips64InstrInfo.td
+++ lib/Target/Mips/Mips64InstrInfo.td
@@ -428,6 +428,8 @@
 def : InstAlias<"addu $rs, $imm",
                 (ADDiu GPR32Opnd:$rs, GPR32Opnd:$rs, simm16:$imm),
                 0>;
+def : InstAlias<"dsll $rd, $rt, $rs",
+                (DSLLV GPR64Opnd:$rd, GPR64Opnd:$rt, GPR32Opnd:$rs), 0>;
 def : InstAlias<"dsubu $rt, $rs, $imm",
                 (DADDiu GPR64Opnd:$rt, GPR64Opnd:$rs,
                 InvertedImOperand64: $imm),0>;
@@ -437,6 +439,8 @@
 def : InstAlias<"dsubu $rs, $imm",
                 (DADDiu GPR64Opnd:$rs, GPR64Opnd:$rs, InvertedImOperand64:$imm),
                 0>;
+def : InstAlias<"dsrl $rd, $rt, $rs",
+                (DSRLV GPR64Opnd:$rd, GPR64Opnd:$rt, GPR32Opnd:$rs), 0>;
 
 /// Move between CPU and coprocessor registers
 let DecoderNamespace = "Mips64", Predicates = [HasMips64] in {
Index: test/MC/Mips/mips3/valid.s
===================================================================
--- test/MC/Mips/mips3/valid.s
+++ test/MC/Mips/mips3/valid.s
@@ -47,6 +47,7 @@
 	dmultu	$a1,$a2
 	dsll   $zero,18             # CHECK: dsll $zero, $zero, 18       # encoding: [0x00,0x00,0x04,0xb8]
 	dsll   $zero,$s4,18         # CHECK: dsll $zero, $20, 18         # encoding: [0x00,0x14,0x04,0xb8]
+	dsll   $zero,$s4,$t4        # CHECK: dsllv $zero, $20, $12       # encoding: [0x01,0x94,0x00,0x14]
 	dsll32 $zero,18             # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsll32 $zero,$zero,18       # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsllv  $zero,$t4            # CHECK: dsllv $zero, $zero, $12     # encoding: [0x01,0x80,0x00,0x14]
@@ -59,6 +60,7 @@
 	dsrav  $gp,$s2,$s3          # CHECK: dsrav $gp, $18, $19         # encoding: [0x02,0x72,0xe0,0x17]
 	dsrl   $s3,23               # CHECK: dsrl $19, $19, 23           # encoding: [0x00,0x13,0x9d,0xfa]
 	dsrl   $s3,$6,23            # CHECK: dsrl $19, $6, 23            # encoding: [0x00,0x06,0x9d,0xfa]
+	dsrl   $s3,$6,$s4           # CHECK: dsrlv $19, $6, $20          # encoding: [0x02,0x86,0x98,0x16]
 	dsrl32 $s3,23               # CHECK: dsrl32 $19, $19, 23         # encoding: [0x00,0x13,0x9d,0xfe]
 	dsrl32 $s3,$6,23            # CHECK: dsrl32 $19, $6, 23          # encoding: [0x00,0x06,0x9d,0xfe]
 	dsrlv  $s3,$s4              # CHECK: dsrlv $19, $19, $20         # encoding: [0x02,0x93,0x98,0x16]
Index: test/MC/Mips/mips4/valid.s
===================================================================
--- test/MC/Mips/mips4/valid.s
+++ test/MC/Mips/mips4/valid.s
@@ -46,6 +46,7 @@
 	dmultu	$a1,$a2
 	dsll  $zero,18             # CHECK: dsll $zero, $zero, 18       # encoding: [0x00,0x00,0x04,0xb8]
 	dsll  $zero,$s4,18         # CHECK: dsll $zero, $20, 18         # encoding: [0x00,0x14,0x04,0xb8]
+	dsll  $zero,$s4,$t4        # CHECK: dsllv $zero, $20, $12       # encoding: [0x01,0x94,0x00,0x14]
 	dsll32 $zero,18            # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsll32 $zero,$zero,18      # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsllv $zero,$t4            # CHECK: dsllv $zero, $zero, $12     # encoding: [0x01,0x80,0x00,0x14]
@@ -58,6 +59,7 @@
 	dsrav $gp,$s2,$s3          # CHECK: dsrav $gp, $18, $19         # encoding: [0x02,0x72,0xe0,0x17]
 	dsrl  $s3,23               # CHECK: dsrl $19, $19, 23           # encoding: [0x00,0x13,0x9d,0xfa]
 	dsrl  $s3,$6,23            # CHECK: dsrl $19, $6, 23            # encoding: [0x00,0x06,0x9d,0xfa]
+	dsrl  $s3,$6,$s4           # CHECK: dsrlv $19, $6, $20          # encoding: [0x02,0x86,0x98,0x16]
 	dsrl32  $s3,23             # CHECK: dsrl32 $19, $19, 23         # encoding: [0x00,0x13,0x9d,0xfe]
 	dsrl32  $s3,$6,23          # CHECK: dsrl32 $19, $6, 23          # encoding: [0x00,0x06,0x9d,0xfe]
 	dsrlv $s3,$s4              # CHECK: dsrlv $19, $19, $20         # encoding: [0x02,0x93,0x98,0x16]
Index: test/MC/Mips/mips5/valid.s
===================================================================
--- test/MC/Mips/mips5/valid.s
+++ test/MC/Mips/mips5/valid.s
@@ -47,6 +47,7 @@
 	dmultu	$a1,$a2
 	dsll  $zero,18             # CHECK: dsll $zero, $zero, 18       # encoding: [0x00,0x00,0x04,0xb8]
 	dsll  $zero,$s4,18         # CHECK: dsll $zero, $20, 18         # encoding: [0x00,0x14,0x04,0xb8]
+	dsll  $zero,$s4,$t4        # CHECK: dsllv $zero, $20, $12       # encoding: [0x01,0x94,0x00,0x14]
 	dsll32 $zero,18            # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsll32 $zero,$zero,18      # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsllv $zero,$t4            # CHECK: dsllv $zero, $zero, $12     # encoding: [0x01,0x80,0x00,0x14]
@@ -59,6 +60,7 @@
 	dsrav $gp,$s2,$s3          # CHECK: dsrav $gp, $18, $19         # encoding: [0x02,0x72,0xe0,0x17]
 	dsrl  $s3,23               # CHECK: dsrl $19, $19, 23           # encoding: [0x00,0x13,0x9d,0xfa]
 	dsrl  $s3,$6,23            # CHECK: dsrl $19, $6, 23            # encoding: [0x00,0x06,0x9d,0xfa]
+	dsrl  $s3,$6,$s4           # CHECK: dsrlv $19, $6, $20          # encoding: [0x02,0x86,0x98,0x16]
 	dsrl32  $s3,23             # CHECK: dsrl32 $19, $19, 23         # encoding: [0x00,0x13,0x9d,0xfe]
 	dsrl32  $s3,$6,23          # CHECK: dsrl32 $19, $6, 23          # encoding: [0x00,0x06,0x9d,0xfe]
 	dsrlv $s3,$s4              # CHECK: dsrlv $19, $19, $20         # encoding: [0x02,0x93,0x98,0x16]
Index: test/MC/Mips/mips64/valid.s
===================================================================
--- test/MC/Mips/mips64/valid.s
+++ test/MC/Mips/mips64/valid.s
@@ -51,6 +51,7 @@
 	dmultu	$a1,$a2
 	dsll  $zero,18             # CHECK: dsll $zero, $zero, 18       # encoding: [0x00,0x00,0x04,0xb8]
 	dsll  $zero,$s4,18         # CHECK: dsll $zero, $20, 18         # encoding: [0x00,0x14,0x04,0xb8]
+	dsll  $zero,$s4,$t4        # CHECK: dsllv $zero, $20, $12       # encoding: [0x01,0x94,0x00,0x14]
 	dsll32 $zero,18            # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsll32 $zero,$zero,18      # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsllv $zero,$t4            # CHECK: dsllv $zero, $zero, $12     # encoding: [0x01,0x80,0x00,0x14]
@@ -63,6 +64,7 @@
 	dsrav $gp,$s2,$s3          # CHECK: dsrav $gp, $18, $19         # encoding: [0x02,0x72,0xe0,0x17]
 	dsrl  $s3,23               # CHECK: dsrl $19, $19, 23           # encoding: [0x00,0x13,0x9d,0xfa]
 	dsrl  $s3,$6,23            # CHECK: dsrl $19, $6, 23            # encoding: [0x00,0x06,0x9d,0xfa]
+	dsrl  $s3,$6,$s4           # CHECK: dsrlv $19, $6, $20          # encoding: [0x02,0x86,0x98,0x16]
 	dsrl32  $s3,23             # CHECK: dsrl32 $19, $19, 23         # encoding: [0x00,0x13,0x9d,0xfe]
 	dsrl32  $s3,$6,23          # CHECK: dsrl32 $19, $6, 23          # encoding: [0x00,0x06,0x9d,0xfe]
 	dsrlv $s3,$s4              # CHECK: dsrlv $19, $19, $20         # encoding: [0x02,0x93,0x98,0x16]
Index: test/MC/Mips/mips64r2/valid.s
===================================================================
--- test/MC/Mips/mips64r2/valid.s
+++ test/MC/Mips/mips64r2/valid.s
@@ -60,6 +60,7 @@
 	dshd	$v0,$sp
 	dsll  $zero,18             # CHECK: dsll $zero, $zero, 18       # encoding: [0x00,0x00,0x04,0xb8]
 	dsll  $zero,$s4,18         # CHECK: dsll $zero, $20, 18         # encoding: [0x00,0x14,0x04,0xb8]
+	dsll  $zero,$s4,$t4        # CHECK: dsllv $zero, $20, $12       # encoding: [0x01,0x94,0x00,0x14]
 	dsll32 $zero,18            # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsll32 $zero,$zero,18      # CHECK: dsll32 $zero, $zero, 18     # encoding: [0x00,0x00,0x04,0xbc]
 	dsllv $zero,$t4            # CHECK: dsllv $zero, $zero, $12     # encoding: [0x01,0x80,0x00,0x14]
@@ -72,6 +73,7 @@
 	dsrav $gp,$s2,$s3          # CHECK: dsrav $gp, $18, $19         # encoding: [0x02,0x72,0xe0,0x17]
 	dsrl  $s3,23               # CHECK: dsrl $19, $19, 23           # encoding: [0x00,0x13,0x9d,0xfa]
 	dsrl  $s3,$6,23            # CHECK: dsrl $19, $6, 23            # encoding: [0x00,0x06,0x9d,0xfa]
+	dsrl  $s3,$6,$s4           # CHECK: dsrlv $19, $6, $20          # encoding: [0x02,0x86,0x98,0x16]
 	dsrl32  $s3,23             # CHECK: dsrl32 $19, $19, 23         # encoding: [0x00,0x13,0x9d,0xfe]
 	dsrl32  $s3,$6,23          # CHECK: dsrl32 $19, $6, 23          # encoding: [0x00,0x06,0x9d,0xfe]
 	dsrlv $s3,$s4              # CHECK: dsrlv $19, $19, $20         # encoding: [0x02,0x93,0x98,0x16]