diff --git a/clang/lib/Basic/Targets/LoongArch.cpp b/clang/lib/Basic/Targets/LoongArch.cpp
--- a/clang/lib/Basic/Targets/LoongArch.cpp
+++ b/clang/lib/Basic/Targets/LoongArch.cpp
@@ -88,6 +88,10 @@
     // A signed 12-bit constant (for arithmetic instructions).
     Info.setRequiresImmediate(-2048, 2047);
     return true;
+  case 'J':
+    // Integer zero.
+    Info.setRequiresImmediate(0);
+    return true;
   case 'K':
     // An unsigned 12-bit constant (for logic instructions).
     Info.setRequiresImmediate(0, 4095);
diff --git a/clang/test/CodeGen/LoongArch/inline-asm-constraints.c b/clang/test/CodeGen/LoongArch/inline-asm-constraints.c
--- a/clang/test/CodeGen/LoongArch/inline-asm-constraints.c
+++ b/clang/test/CodeGen/LoongArch/inline-asm-constraints.c
@@ -43,6 +43,12 @@
   asm volatile ("" :: "I"(-2048));
 }
 
+void test_J(void) {
+// CHECK-LABEL: define{{.*}} void @test_J()
+// CHECK: call void asm sideeffect "", "J"(i32 0)
+  asm volatile ("" :: "J"(0));
+}
+
 void test_K(void) {
 // CHECK-LABEL: define{{.*}} void @test_K()
 // CHECK: call void asm sideeffect "", "K"(i32 4095)
diff --git a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
--- a/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -2169,6 +2169,7 @@
       return C_RegisterClass;
     case 'l':
     case 'I':
+    case 'J':
     case 'K':
       return C_Immediate;
     case 'k':
@@ -2272,6 +2273,13 @@
               DAG.getTargetConstant(CVal, SDLoc(Op), Subtarget.getGRLenVT()));
       }
       return;
+    case 'J':
+      // Validate & create an integer zero operand.
+      if (auto *C = dyn_cast<ConstantSDNode>(Op))
+        if (C->getZExtValue() == 0)
+          Ops.push_back(
+              DAG.getTargetConstant(0, SDLoc(Op), Subtarget.getGRLenVT()));
+      return;
     case 'K':
       // Validate & create a 12-bit unsigned immediate operand.
       if (auto *C = dyn_cast<ConstantSDNode>(Op)) {
diff --git a/llvm/test/CodeGen/LoongArch/inline-asm-constraint-error.ll b/llvm/test/CodeGen/LoongArch/inline-asm-constraint-error.ll
--- a/llvm/test/CodeGen/LoongArch/inline-asm-constraint-error.ll
+++ b/llvm/test/CodeGen/LoongArch/inline-asm-constraint-error.ll
@@ -17,6 +17,12 @@
   ret void
 }
 
+define void @constraint_J() {
+; CHECK: error: value out of range for constraint 'J'
+  tail call void asm sideeffect "addi.w $$a0, $$a0, $$0", "J"(i32 1)
+  ret void
+}
+
 define void @constraint_K() {
 ; CHECK: error: value out of range for constraint 'K'
   tail call void asm sideeffect "andi.w $$a0, $$a0, $0", "K"(i32 4096)
diff --git a/llvm/test/CodeGen/LoongArch/inline-asm-constraint.ll b/llvm/test/CodeGen/LoongArch/inline-asm-constraint.ll
--- a/llvm/test/CodeGen/LoongArch/inline-asm-constraint.ll
+++ b/llvm/test/CodeGen/LoongArch/inline-asm-constraint.ll
@@ -58,6 +58,17 @@
   ret void
 }
 
+define void @constraint_J() nounwind {
+; CHECK-LABEL: constraint_J:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    #APP
+; CHECK-NEXT:    addi.w $a0, $a0, 0
+; CHECK-NEXT:    #NO_APP
+; CHECK-NEXT:    ret
+  tail call void asm sideeffect "addi.w $$a0, $$a0, $0", "J"(i32 0)
+  ret void
+}
+
 define void @constraint_K() nounwind {
 ; CHECK-LABEL: constraint_K:
 ; CHECK:       # %bb.0: