diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -1032,6 +1032,7 @@
   setTargetDAGCombine(ISD::ROTR);
   setTargetDAGCombine(ISD::ANY_EXTEND);
   setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
+  setTargetDAGCombine(ISD::BSWAP);
   if (Subtarget.hasStdExtZfh())
     setTargetDAGCombine(ISD::SIGN_EXTEND_INREG);
   if (Subtarget.hasStdExtF()) {
@@ -8501,6 +8502,20 @@
     }
     }
   }
+  case ISD::BSWAP: {
+    // Combine t2 = bswap t1; t3 = srl t2, x; bswap t3
+    // to shl t1, x.
+    SDValue Srl = N->getOperand(0);
+    if (Srl->getOpcode() != ISD::SRL || !Srl.hasOneUse())
+      return SDValue();
+    SDValue BSwap = Srl->getOperand(0);
+    if (BSwap->getOpcode() != ISD::BSWAP || !BSwap.hasOneUse())
+      return SDValue();
+    SDLoc DL(N);
+    EVT VT = N->getValueType(0);
+    return DAG.getNode(ISD::SHL, DL, VT, BSwap->getOperand(0),
+                       Srl->getOperand(1));
+  }
   }
 
   return SDValue();
diff --git a/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll b/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll
--- a/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll
+++ b/llvm/test/CodeGen/RISCV/bswap-bitreverse.ll
@@ -848,18 +848,14 @@
 ;
 ; RV32ZBKB-LABEL: test_bswap_bitreverse_i16:
 ; RV32ZBKB:       # %bb.0:
-; RV32ZBKB-NEXT:    rev8 a0, a0
-; RV32ZBKB-NEXT:    srli a0, a0, 16
-; RV32ZBKB-NEXT:    rev8 a0, a0
+; RV32ZBKB-NEXT:    slli a0, a0, 16
 ; RV32ZBKB-NEXT:    brev8 a0, a0
 ; RV32ZBKB-NEXT:    srli a0, a0, 16
 ; RV32ZBKB-NEXT:    ret
 ;
 ; RV64ZBKB-LABEL: test_bswap_bitreverse_i16:
 ; RV64ZBKB:       # %bb.0:
-; RV64ZBKB-NEXT:    rev8 a0, a0
-; RV64ZBKB-NEXT:    srli a0, a0, 48
-; RV64ZBKB-NEXT:    rev8 a0, a0
+; RV64ZBKB-NEXT:    slli a0, a0, 48
 ; RV64ZBKB-NEXT:    brev8 a0, a0
 ; RV64ZBKB-NEXT:    srli a0, a0, 48
 ; RV64ZBKB-NEXT:    ret
@@ -977,9 +973,7 @@
 ;
 ; RV64ZBKB-LABEL: test_bswap_bitreverse_i32:
 ; RV64ZBKB:       # %bb.0:
-; RV64ZBKB-NEXT:    rev8 a0, a0
-; RV64ZBKB-NEXT:    srli a0, a0, 32
-; RV64ZBKB-NEXT:    rev8 a0, a0
+; RV64ZBKB-NEXT:    slli a0, a0, 32
 ; RV64ZBKB-NEXT:    brev8 a0, a0
 ; RV64ZBKB-NEXT:    srli a0, a0, 32
 ; RV64ZBKB-NEXT:    ret
@@ -1238,18 +1232,14 @@
 ;
 ; RV32ZBKB-LABEL: test_bitreverse_bswap_i16:
 ; RV32ZBKB:       # %bb.0:
-; RV32ZBKB-NEXT:    rev8 a0, a0
-; RV32ZBKB-NEXT:    srli a0, a0, 16
-; RV32ZBKB-NEXT:    rev8 a0, a0
+; RV32ZBKB-NEXT:    slli a0, a0, 16
 ; RV32ZBKB-NEXT:    brev8 a0, a0
 ; RV32ZBKB-NEXT:    srli a0, a0, 16
 ; RV32ZBKB-NEXT:    ret
 ;
 ; RV64ZBKB-LABEL: test_bitreverse_bswap_i16:
 ; RV64ZBKB:       # %bb.0:
-; RV64ZBKB-NEXT:    rev8 a0, a0
-; RV64ZBKB-NEXT:    srli a0, a0, 48
-; RV64ZBKB-NEXT:    rev8 a0, a0
+; RV64ZBKB-NEXT:    slli a0, a0, 48
 ; RV64ZBKB-NEXT:    brev8 a0, a0
 ; RV64ZBKB-NEXT:    srli a0, a0, 48
 ; RV64ZBKB-NEXT:    ret
@@ -1367,9 +1357,7 @@
 ;
 ; RV64ZBKB-LABEL: test_bitreverse_bswap_i32:
 ; RV64ZBKB:       # %bb.0:
-; RV64ZBKB-NEXT:    rev8 a0, a0
-; RV64ZBKB-NEXT:    srli a0, a0, 32
-; RV64ZBKB-NEXT:    rev8 a0, a0
+; RV64ZBKB-NEXT:    slli a0, a0, 32
 ; RV64ZBKB-NEXT:    brev8 a0, a0
 ; RV64ZBKB-NEXT:    srli a0, a0, 32
 ; RV64ZBKB-NEXT:    ret