diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.h b/llvm/lib/Target/RISCV/RISCVISelLowering.h
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.h
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.h
@@ -64,6 +64,26 @@
 };
 }
 
+namespace RISCV {
+// Must agree with definitions in RISCVSystemOperands.td
+enum SysReg {
+  // User Floating-Point CSRs
+  FFLAGS = 0x001,
+  FRM = 0x002,
+  FCSR = 0x003
+};
+
+enum Rounding {
+  RNE = 0, ///< NearestTiesToEven.
+  RTZ = 1, ///< TowardZero.
+  RDN = 2, ///< TowardNegative.
+  RUP = 3, ///< TowardPositive.
+  RMM = 4, ///< NearestTiesToAway.
+  MaxRounding = RMM,
+  DYN = 7
+};
+} // namespace RISCV
+
 class RISCVTargetLowering : public TargetLowering {
   const RISCVSubtarget &Subtarget;
 
@@ -239,6 +259,7 @@
   SDValue lowerShiftLeftParts(SDValue Op, SelectionDAG &DAG) const;
   SDValue lowerShiftRightParts(SDValue Op, SelectionDAG &DAG, bool IsSRA) const;
   SDValue LowerINTRINSIC_WO_CHAIN(SDValue Op, SelectionDAG &DAG) const;
+  SDValue lowerGET_ROUNDING(SDValue Op, SelectionDAG &DAG) const;
 
   bool isEligibleForTailCallOptimization(
       CCState &CCInfo, CallLoweringInfo &CLI, MachineFunction &MF,
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
@@ -222,6 +222,11 @@
     setOperationAction(ISD::STRICT_FP_TO_SINT, MVT::i32, Custom);
   }
 
+  if (Subtarget.hasStdExtF()) {
+    setOperationAction(ISD::FLT_ROUNDS_,
+                       (Subtarget.is64Bit() ? MVT::i64 : MVT::i32), Custom);
+  }
+
   setOperationAction(ISD::GlobalAddress, XLenVT, Custom);
   setOperationAction(ISD::BlockAddress, XLenVT, Custom);
   setOperationAction(ISD::ConstantPool, XLenVT, Custom);
@@ -471,6 +476,8 @@
   }
   case ISD::INTRINSIC_WO_CHAIN:
     return LowerINTRINSIC_WO_CHAIN(Op, DAG);
+  case ISD::FLT_ROUNDS_:
+    return lowerGET_ROUNDING(Op, DAG);
   }
 }
 
@@ -886,6 +893,36 @@
   }
 }
 
+SDValue RISCVTargetLowering::lowerGET_ROUNDING(SDValue Op,
+                                               SelectionDAG &DAG) const {
+  const MVT IntTy = Subtarget.getXLenVT();
+  SDLoc DL(Op);
+  SDValue Chain = Op->getOperand(0);
+  SDValue SysRegNo = DAG.getConstant(RISCV::SysReg::FRM, DL, IntTy);
+  SDVTList VTs = DAG.getVTList(IntTy, MVT::Other);
+  SDValue RM = DAG.getNode(RISCVISD::READ_CSR, DL, VTs, Chain, SysRegNo);
+
+  // Encoding used for rounding mode in RISCV differs from that used in
+  // FLT_ROUNDS. To convert it the RISCV rounding mode is used as an index in a
+  // table, which consists of a sequence of 4-bit fields, each representing
+  // corresponding FLT_ROUNDS mode.
+  static const int Table =
+      (int(RoundingMode::NearestTiesToEven) << 4 * RISCV::Rounding::RNE) |
+      (int(RoundingMode::TowardZero) << 4 * RISCV::Rounding::RTZ) |
+      (int(RoundingMode::TowardNegative) << 4 * RISCV::Rounding::RDN) |
+      (int(RoundingMode::TowardPositive) << 4 * RISCV::Rounding::RUP) |
+      (int(RoundingMode::NearestTiesToAway) << 4 * RISCV::Rounding::RMM);
+
+  SDValue Shift =
+      DAG.getNode(ISD::SHL, DL, IntTy, RM, DAG.getConstant(2, DL, IntTy));
+  SDValue Shifted = DAG.getNode(ISD::SRL, DL, IntTy,
+                                DAG.getConstant(Table, DL, IntTy), Shift);
+  SDValue Masked =
+      DAG.getNode(ISD::AND, DL, IntTy, Shifted, DAG.getConstant(7, DL, IntTy));
+
+  return DAG.getMergeValues({Masked, Chain}, DL);
+}
+
 // Returns the opcode of the target-specific SDNode that implements the 32-bit
 // form of the given Opcode.
 static RISCVISD::NodeType getRISCVWOpcode(unsigned Opcode) {
@@ -1026,6 +1063,15 @@
     Results.push_back(DAG.getNode(ISD::TRUNCATE, DL, MVT::i32, FPConv));
     break;
   }
+  case ISD::FLT_ROUNDS_: {
+    assert(N->getValueType(0) == MVT::i32 && Subtarget.is64Bit() &&
+           Subtarget.hasStdExtF() && "Unexpected custom legalization");
+    SDVTList VTs = DAG.getVTList(MVT::i64, MVT::Other);
+    SDValue Res = DAG.getNode(ISD::FLT_ROUNDS_, DL, VTs, N->getOperand(0));
+    Results.push_back(SDValue(Res.getNode(), 0));
+    Results.push_back(SDValue(Res.getNode(), 1));
+    break;
+  }
   }
 }
 
diff --git a/llvm/test/CodeGen/RISCV/fpenv.ll b/llvm/test/CodeGen/RISCV/fpenv.ll
new file mode 100644
--- /dev/null
+++ b/llvm/test/CodeGen/RISCV/fpenv.ll
@@ -0,0 +1,27 @@
+; RUN: llc -mtriple=riscv32 -mattr=+f -verify-machineinstrs < %s | FileCheck -check-prefix=RV32IF %s
+; RUN: llc -mtriple=riscv64 -mattr=+f -verify-machineinstrs < %s | FileCheck -check-prefix=RV64IF %s
+
+define i32 @func_01() {
+  %rm = call i32 @llvm.flt.rounds()
+  ret i32 %rm
+}
+
+; RV32IF-LABEL: func_01:
+; RV32IF:       frrm  a0
+; RV32IF:       slli  a0, a0, 2
+; RV32IF:       lui   a1, 66
+; RV32IF:       addi  a1, a1, 769
+; RV32IF:       srl   a0, a1, a0
+; RV32IF:       andi  a0, a0, 7
+; RV32IF:       ret
+
+; RV64IF-LABEL: func_01:
+; RV64IF:       frrm  a0
+; RV64IF:       slli  a0, a0, 2
+; RV64IF:       lui   a1, 66
+; RV64IF:       addiw a1, a1, 769
+; RV64IF:       srl   a0, a1, a0
+; RV64IF:       andi  a0, a0, 7
+; RV64IF:       ret
+
+declare i32 @llvm.flt.rounds()