Index: llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
===================================================================
--- llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
+++ llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
@@ -3165,6 +3165,22 @@
         ((Imm - 2).isPowerOf2() || (Imm - 4).isPowerOf2() ||
          (Imm - 8).isPowerOf2() || (Imm - 16).isPowerOf2()))
       return true;
+    // Break (MUL x, imm) into (ADD/SUB (SLLI x, s0), (SLLI x, s1)),
+    // in which the immediate has two set bits.
+    // We should reject immediates which can be composed via a single
+    // ADDI/ORI/LUI. However this is a conservative decision.
+    if (ConstNode->hasOneUse() && !(Imm.sge(-2048) && Imm.sle(4095))) {
+      unsigned Shifts = Imm.countr_zero();
+      // Reject immediates which can be composed via a single LUI.
+      if (Shifts >= 12)
+        return false;
+      APInt ImmSmall = APInt(64, 1 << Shifts);
+      // We do not consider the case `(-Imm - ImmSmall).isPowerOf2()`,
+      // since it needs one more instruction than other 3 cases.
+      if ((Imm - ImmSmall).isPowerOf2() || (Imm + ImmSmall).isPowerOf2() ||
+          (ImmSmall - Imm).isPowerOf2())
+        return true;
+    }
   }
 
   return false;
Index: llvm/test/CodeGen/LoongArch/ir-instruction/mul.ll
===================================================================
--- llvm/test/CodeGen/LoongArch/ir-instruction/mul.ll
+++ llvm/test/CodeGen/LoongArch/ir-instruction/mul.ll
@@ -1218,17 +1218,16 @@
 define signext i32 @mul_i32_4352(i32 %a) {
 ; LA32-LABEL: mul_i32_4352:
 ; LA32:       # %bb.0:
-; LA32-NEXT:    lu12i.w $a1, 1
-; LA32-NEXT:    ori $a1, $a1, 256
-; LA32-NEXT:    mul.w $a0, $a0, $a1
+; LA32-NEXT:    slli.w $a1, $a0, 8
+; LA32-NEXT:    slli.w $a0, $a0, 12
+; LA32-NEXT:    add.w $a0, $a0, $a1
 ; LA32-NEXT:    ret
 ;
 ; LA64-LABEL: mul_i32_4352:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, 1
-; LA64-NEXT:    ori $a1, $a1, 256
-; LA64-NEXT:    mul.d $a0, $a0, $a1
-; LA64-NEXT:    addi.w $a0, $a0, 0
+; LA64-NEXT:    slli.d $a1, $a0, 8
+; LA64-NEXT:    slli.d $a0, $a0, 12
+; LA64-NEXT:    add.w $a0, $a0, $a1
 ; LA64-NEXT:    ret
   %b = mul i32 %a, 4352
   ret i32 %b
@@ -1304,9 +1303,9 @@
 ;
 ; LA64-LABEL: mul_i64_4352:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, 1
-; LA64-NEXT:    ori $a1, $a1, 256
-; LA64-NEXT:    mul.d $a0, $a0, $a1
+; LA64-NEXT:    slli.d $a1, $a0, 8
+; LA64-NEXT:    slli.d $a0, $a0, 12
+; LA64-NEXT:    add.d $a0, $a0, $a1
 ; LA64-NEXT:    ret
   %b = mul i64 %a, 4352
   ret i64 %b
@@ -1315,17 +1314,16 @@
 define signext i32 @mul_i32_65792(i32 %a) {
 ; LA32-LABEL: mul_i32_65792:
 ; LA32:       # %bb.0:
-; LA32-NEXT:    lu12i.w $a1, 16
-; LA32-NEXT:    ori $a1, $a1, 256
-; LA32-NEXT:    mul.w $a0, $a0, $a1
+; LA32-NEXT:    slli.w $a1, $a0, 8
+; LA32-NEXT:    slli.w $a0, $a0, 16
+; LA32-NEXT:    add.w $a0, $a0, $a1
 ; LA32-NEXT:    ret
 ;
 ; LA64-LABEL: mul_i32_65792:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, 16
-; LA64-NEXT:    ori $a1, $a1, 256
-; LA64-NEXT:    mul.d $a0, $a0, $a1
-; LA64-NEXT:    addi.w $a0, $a0, 0
+; LA64-NEXT:    slli.d $a1, $a0, 8
+; LA64-NEXT:    slli.d $a0, $a0, 16
+; LA64-NEXT:    add.w $a0, $a0, $a1
 ; LA64-NEXT:    ret
   %b = mul i32 %a, 65792
   ret i32 %b
@@ -1334,17 +1332,16 @@
 define signext i32 @mul_i32_65280(i32 %a) {
 ; LA32-LABEL: mul_i32_65280:
 ; LA32:       # %bb.0:
-; LA32-NEXT:    lu12i.w $a1, 15
-; LA32-NEXT:    ori $a1, $a1, 3840
-; LA32-NEXT:    mul.w $a0, $a0, $a1
+; LA32-NEXT:    slli.w $a1, $a0, 8
+; LA32-NEXT:    slli.w $a0, $a0, 16
+; LA32-NEXT:    sub.w $a0, $a0, $a1
 ; LA32-NEXT:    ret
 ;
 ; LA64-LABEL: mul_i32_65280:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, 15
-; LA64-NEXT:    ori $a1, $a1, 3840
-; LA64-NEXT:    mul.d $a0, $a0, $a1
-; LA64-NEXT:    addi.w $a0, $a0, 0
+; LA64-NEXT:    slli.d $a1, $a0, 8
+; LA64-NEXT:    slli.d $a0, $a0, 16
+; LA64-NEXT:    sub.w $a0, $a0, $a1
 ; LA64-NEXT:    ret
   %b = mul i32 %a, 65280
   ret i32 %b
@@ -1360,10 +1357,9 @@
 ;
 ; LA64-LABEL: mul_i32_minus_65280:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, -16
-; LA64-NEXT:    ori $a1, $a1, 256
-; LA64-NEXT:    mul.d $a0, $a0, $a1
-; LA64-NEXT:    addi.w $a0, $a0, 0
+; LA64-NEXT:    slli.d $a1, $a0, 16
+; LA64-NEXT:    slli.d $a0, $a0, 8
+; LA64-NEXT:    sub.w $a0, $a0, $a1
 ; LA64-NEXT:    ret
   %b = mul i32 %a, -65280
   ret i32 %b
@@ -1382,9 +1378,9 @@
 ;
 ; LA64-LABEL: mul_i64_65792:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, 16
-; LA64-NEXT:    ori $a1, $a1, 256
-; LA64-NEXT:    mul.d $a0, $a0, $a1
+; LA64-NEXT:    slli.d $a1, $a0, 8
+; LA64-NEXT:    slli.d $a0, $a0, 16
+; LA64-NEXT:    add.d $a0, $a0, $a1
 ; LA64-NEXT:    ret
   %b = mul i64 %a, 65792
   ret i64 %b
@@ -1403,9 +1399,9 @@
 ;
 ; LA64-LABEL: mul_i64_65280:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, 15
-; LA64-NEXT:    ori $a1, $a1, 3840
-; LA64-NEXT:    mul.d $a0, $a0, $a1
+; LA64-NEXT:    slli.d $a1, $a0, 8
+; LA64-NEXT:    slli.d $a0, $a0, 16
+; LA64-NEXT:    sub.d $a0, $a0, $a1
 ; LA64-NEXT:    ret
   %b = mul i64 %a, 65280
   ret i64 %b
@@ -1425,9 +1421,9 @@
 ;
 ; LA64-LABEL: mul_i64_minus_65280:
 ; LA64:       # %bb.0:
-; LA64-NEXT:    lu12i.w $a1, -16
-; LA64-NEXT:    ori $a1, $a1, 256
-; LA64-NEXT:    mul.d $a0, $a0, $a1
+; LA64-NEXT:    slli.d $a1, $a0, 16
+; LA64-NEXT:    slli.d $a0, $a0, 8
+; LA64-NEXT:    sub.d $a0, $a0, $a1 
 ; LA64-NEXT:    ret
   %b = mul i64 %a, -65280
   ret i64 %b