diff --git a/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td b/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
--- a/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
+++ b/llvm/lib/Target/LoongArch/LoongArchInstrInfo.td
@@ -1199,6 +1199,10 @@
 
 /// Select
 
+def : Pat<(select GPR:$cond, GPR:$t, (i32 0)), (MASKEQZ GPR:$t, GPR:$cond)>;
+def : Pat<(select GPR:$cond, (i32 0), GPR:$f), (MASKNEZ GPR:$f, GPR:$cond)>;
+def : Pat<(select GPR:$cond, GPR:$t, (i64 0)), (MASKEQZ GPR:$t, GPR:$cond)>;
+def : Pat<(select GPR:$cond, (i64 0), GPR:$f), (MASKNEZ GPR:$f, GPR:$cond)>;
 def : Pat<(select GPR:$cond, GPR:$t, GPR:$f),
           (OR (MASKEQZ GPR:$t, GPR:$cond), (MASKNEZ GPR:$f, GPR:$cond))>;
 
diff --git a/llvm/test/CodeGen/LoongArch/atomicrmw-uinc-udec-wrap.ll b/llvm/test/CodeGen/LoongArch/atomicrmw-uinc-udec-wrap.ll
--- a/llvm/test/CodeGen/LoongArch/atomicrmw-uinc-udec-wrap.ll
+++ b/llvm/test/CodeGen/LoongArch/atomicrmw-uinc-udec-wrap.ll
@@ -22,8 +22,6 @@
 ; LA64-NEXT:    addi.d $a5, $a5, 1
 ; LA64-NEXT:    xori $a6, $a6, 1
 ; LA64-NEXT:    masknez $a5, $a5, $a6
-; LA64-NEXT:    maskeqz $a6, $zero, $a6
-; LA64-NEXT:    or $a5, $a6, $a5
 ; LA64-NEXT:    andi $a5, $a5, 255
 ; LA64-NEXT:    sll.w $a5, $a5, $a0
 ; LA64-NEXT:    and $a6, $a3, $a4
@@ -77,8 +75,6 @@
 ; LA64-NEXT:    addi.d $a5, $a5, 1
 ; LA64-NEXT:    xori $a6, $a6, 1
 ; LA64-NEXT:    masknez $a5, $a5, $a6
-; LA64-NEXT:    maskeqz $a6, $zero, $a6
-; LA64-NEXT:    or $a5, $a6, $a5
 ; LA64-NEXT:    bstrpick.d $a5, $a5, 15, 0
 ; LA64-NEXT:    sll.w $a5, $a5, $a0
 ; LA64-NEXT:    and $a6, $a3, $a4
@@ -123,8 +119,6 @@
 ; LA64-NEXT:    xori $a1, $a1, 1
 ; LA64-NEXT:    addi.d $a4, $a3, 1
 ; LA64-NEXT:    masknez $a4, $a4, $a1
-; LA64-NEXT:    maskeqz $a1, $zero, $a1
-; LA64-NEXT:    or $a4, $a1, $a4
 ; LA64-NEXT:  .LBB2_3: # %atomicrmw.start
 ; LA64-NEXT:    # Parent Loop BB2_1 Depth=1
 ; LA64-NEXT:    # => This Inner Loop Header: Depth=2
@@ -164,8 +158,6 @@
 ; LA64-NEXT:    xori $a2, $a2, 1
 ; LA64-NEXT:    addi.d $a4, $a3, 1
 ; LA64-NEXT:    masknez $a4, $a4, $a2
-; LA64-NEXT:    maskeqz $a2, $zero, $a2
-; LA64-NEXT:    or $a4, $a2, $a4
 ; LA64-NEXT:  .LBB3_3: # %atomicrmw.start
 ; LA64-NEXT:    # Parent Loop BB3_1 Depth=1
 ; LA64-NEXT:    # => This Inner Loop Header: Depth=2