diff --git a/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td b/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
index c851b1b6f5eb7..898e0183f3b0c 100644
--- a/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
+++ b/llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
@@ -1404,10 +1404,12 @@ def : Pat<(and (v32i8 LASX256:$xj), (v32i8 (SplatPat_uimm8 uimm8:$imm))),
 // XVORI_B
 def : Pat<(or (v32i8 LASX256:$xj), (v32i8 (SplatPat_uimm8 uimm8:$imm))),
           (XVORI_B LASX256:$xj, uimm8:$imm)>;
-
 // XVXORI_B
 def : Pat<(xor (v32i8 LASX256:$xj), (v32i8 (SplatPat_uimm8 uimm8:$imm))),
           (XVXORI_B LASX256:$xj, uimm8:$imm)>;
+// XVNORI_B
+def : Pat<(vnot (or (v32i8 LASX256:$xj), (v32i8 (SplatPat_uimm8 uimm8:$imm)))),
+          (XVNORI_B LASX256:$xj, uimm8:$imm)>;
 
 // XVBSLL_V
 foreach vt = [v32i8, v16i16, v8i32, v4i64, v8f32,
diff --git a/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td b/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
index fe7c47543424b..571f952c567d0 100644
--- a/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
+++ b/llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
@@ -1598,10 +1598,12 @@ def : Pat<(and (v16i8 LSX128:$vj), (v16i8 (SplatPat_uimm8 uimm8:$imm))),
 // VORI_B
 def : Pat<(or (v16i8 LSX128:$vj), (v16i8 (SplatPat_uimm8 uimm8:$imm))),
           (VORI_B LSX128:$vj, uimm8:$imm)>;
-
 // VXORI_B
 def : Pat<(xor (v16i8 LSX128:$vj), (v16i8 (SplatPat_uimm8 uimm8:$imm))),
           (VXORI_B LSX128:$vj, uimm8:$imm)>;
+// VNORI_B
+def : Pat<(vnot (or (v16i8 LSX128:$vj), (v16i8 (SplatPat_uimm8 uimm8:$imm)))),
+          (VNORI_B LSX128:$vj, uimm8:$imm)>;
 
 // VBSLL_V
 foreach vt = [v16i8, v8i16, v4i32, v2i64, v4f32,
diff --git a/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/nor.ll b/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/nor.ll
index 62ca303475241..5050b6b0ccddc 100644
--- a/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/nor.ll
+++ b/llvm/test/CodeGen/LoongArch/lasx/ir-instruction/nor.ll
@@ -74,8 +74,7 @@ define void @nor_u_v32i8(ptr %res, ptr %a0) nounwind {
 ; CHECK-LABEL: nor_u_v32i8:
 ; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:    xvld $xr0, $a1, 0
-; CHECK-NEXT:    xvrepli.b $xr1, 31
-; CHECK-NEXT:    xvnor.v $xr0, $xr0, $xr1
+; CHECK-NEXT:    xvnori.b $xr0, $xr0, 31
 ; CHECK-NEXT:    xvst $xr0, $a0, 0
 ; CHECK-NEXT:    ret
 entry:
diff --git a/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/nor.ll b/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/nor.ll
index a2c15b28f8827..fc3e1645a0594 100644
--- a/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/nor.ll
+++ b/llvm/test/CodeGen/LoongArch/lsx/ir-instruction/nor.ll
@@ -74,8 +74,7 @@ define void @nor_u_v16i8(ptr %res, ptr %a0) nounwind {
 ; CHECK-LABEL: nor_u_v16i8:
 ; CHECK:       # %bb.0: # %entry
 ; CHECK-NEXT:    vld $vr0, $a1, 0
-; CHECK-NEXT:    vrepli.b $vr1, 31
-; CHECK-NEXT:    vnor.v $vr0, $vr0, $vr1
+; CHECK-NEXT:    vnori.b $vr0, $vr0, 31
 ; CHECK-NEXT:    vst $vr0, $a0, 0
 ; CHECK-NEXT:    ret
 entry: