Index: lib/Target/Mips/MipsInstrInfo.td
===================================================================
--- lib/Target/Mips/MipsInstrInfo.td
+++ lib/Target/Mips/MipsInstrInfo.td
@@ -1203,6 +1203,8 @@
                 (NOR GPR32Opnd:$rt, GPR32Opnd:$rs, ZERO), 0>;
 def : InstAlias<"neg $rt, $rs",
                 (SUB GPR32Opnd:$rt, ZERO, GPR32Opnd:$rs), 1>;
+def : InstAlias<"negu $rt",
+                (SUBu GPR32Opnd:$rt, ZERO, GPR32Opnd:$rt), 0>;
 def : InstAlias<"negu $rt, $rs",
                 (SUBu GPR32Opnd:$rt, ZERO, GPR32Opnd:$rs), 1>;
 def : InstAlias<"slt $rs, $rt, $imm",
Index: test/MC/Mips/mips1/valid.s
===================================================================
--- test/MC/Mips/mips1/valid.s
+++ test/MC/Mips/mips1/valid.s
@@ -58,6 +58,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nop
Index: test/MC/Mips/mips2/valid.s
===================================================================
--- test/MC/Mips/mips2/valid.s
+++ test/MC/Mips/mips2/valid.s
@@ -65,6 +65,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nop
Index: test/MC/Mips/mips3/valid.s
===================================================================
--- test/MC/Mips/mips3/valid.s
+++ test/MC/Mips/mips3/valid.s
@@ -110,6 +110,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nop
Index: test/MC/Mips/mips32/valid.s
===================================================================
--- test/MC/Mips/mips32/valid.s
+++ test/MC/Mips/mips32/valid.s
@@ -89,6 +89,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nop
Index: test/MC/Mips/mips32r2/valid.s
===================================================================
--- test/MC/Mips/mips32r2/valid.s
+++ test/MC/Mips/mips32r2/valid.s
@@ -102,6 +102,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nmadd.d	$f18,$f9,$f14,$f19
Index: test/MC/Mips/mips4/valid.s
===================================================================
--- test/MC/Mips/mips4/valid.s
+++ test/MC/Mips/mips4/valid.s
@@ -125,6 +125,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nop
Index: test/MC/Mips/mips5/valid.s
===================================================================
--- test/MC/Mips/mips5/valid.s
+++ test/MC/Mips/mips5/valid.s
@@ -125,6 +125,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nop
Index: test/MC/Mips/mips64/valid.s
===================================================================
--- test/MC/Mips/mips64/valid.s
+++ test/MC/Mips/mips64/valid.s
@@ -138,6 +138,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nop
Index: test/MC/Mips/mips64r2/valid.s
===================================================================
--- test/MC/Mips/mips64r2/valid.s
+++ test/MC/Mips/mips64r2/valid.s
@@ -152,6 +152,8 @@
 	mult	$sp,$v0
 	multu	$gp,$k0
 	multu	$t1,$s2
+	negu	$2                   # CHECK: negu $2, $2            # encoding: [0x00,0x02,0x10,0x23]
+	negu	$2,$3                # CHECK: negu $2, $3            # encoding: [0x00,0x03,0x10,0x23]
 	neg.d	$f27,$f18
 	neg.s	$f1,$f15
 	nmadd.s	$f0,$f5,$f25,$f12