Index: llvm/lib/Target/RISCV/RISCVInstrInfoV.td
===================================================================
--- llvm/lib/Target/RISCV/RISCVInstrInfoV.td
+++ llvm/lib/Target/RISCV/RISCVInstrInfoV.td
@@ -794,6 +794,9 @@
 defm VFSGNJN_V : VALU_FV_V_F<"vfsgnjn", 0b001001>;
 defm VFSGNJX_V : VALU_FV_V_F<"vfsgnjx", 0b001010>;
 
+def : InstAlias<"vfneg.v $vd, $vs$vm",
+                (VFSGNJN_VV VR:$vd, VR:$vs, VR:$vs, VMaskOp:$vm)>;
+
 // Vector Floating-Point Compare Instructions
 let RVVConstraint = NoConstraint in {
 defm VMFEQ_V : VALU_FV_V_F<"vmfeq", 0b011000>;
Index: llvm/test/MC/RISCV/rvv/sign-injection.s
===================================================================
--- llvm/test/MC/RISCV/rvv/sign-injection.s
+++ llvm/test/MC/RISCV/rvv/sign-injection.s
@@ -82,3 +82,16 @@
 # CHECK-ENCODING: [0x57,0x54,0x45,0x2a]
 # CHECK-ERROR: instruction requires the following: 'F'{{.*}}'V'
 # CHECK-UNKNOWN: 57 54 45 2a <unknown>
+
+vfneg.v v8, v4, v0.t
+# CHECK-INST: vfneg.v v8, v4, v0.t                    
+# CHECK-ENCODING: [0x57,0x14,0x42,0x24]
+# CHECK-ERROR: instruction requires the following: 'F'{{.*}}'V'
+# CHECK-UNKNOWN: 57 14 42 24 <unknown>
+
+vfneg.v v8, v4
+# CHECK-INST: vfsgnjn.vv v8, v4, v4
+# CHECK-ENCODING: [0x57,0x14,0x42,0x26]
+# CHECK-ERROR: instruction requires the following: 'F'{{.*}}'V'
+# CHECK-UNKNOWN: 57 14 42 26 <unknown>
+