fakepaper56 updated this revision to Diff 544228.
fakepaper56 added a comment.
Address Craig's comment.
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D152793/new/
https://reviews.llvm.org/D152793
Files:
clang/test/Preprocessor/riscv-target-features.c
llvm/lib/Support/RISCVISAInfo.cpp
llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
llvm/lib/Target/RISCV/RISCVFeatures.td
llvm/lib/Target/RISCV/RISCVInstrInfo.td
llvm/lib/Target/RISCV/RISCVInstrInfoZicfiss.td
llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
llvm/lib/Target/RISCV/RISCVRegisterInfo.td
llvm/test/MC/RISCV/attribute-arch.s
llvm/test/MC/RISCV/zicfiss-invalid.s
llvm/test/MC/RISCV/zicfiss-valid.s
Index: llvm/test/MC/RISCV/zicfiss-valid.s
===================================================================
--- /dev/null
+++ llvm/test/MC/RISCV/zicfiss-valid.s
@@ -0,0 +1,110 @@
+# RUN: llvm-mc %s -triple=riscv32 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc %s -triple=riscv64 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: | FileCheck -check-prefixes=CHECK-ASM,CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv32 -mattr=+experimental-zicfiss,+c < %s \
+# RUN: | llvm-objdump --mattr=+experimental-zicfiss -M no-aliases -d -r - \
+# RUN: | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+experimental-zicfiss,+c < %s \
+# RUN: | llvm-objdump --mattr=+experimental-zicfiss -M no-aliases -d -r - \
+# RUN: | FileCheck --check-prefix=CHECK-ASM-AND-OBJ %s
+#
+# RUN: not llvm-mc -triple riscv32 -riscv-no-aliases -show-encoding < %s 2>&1 \
+# RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+# RUN: not llvm-mc -triple riscv64 -riscv-no-aliases -show-encoding < %s 2>&1 \
+# RUN: | FileCheck -check-prefixes=CHECK-NO-EXT %s
+
+# CHECK-ASM-AND-OBJ: ssload x1
+# CHECK-ASM: encoding: [0xf3,0x40,0xc0,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssload x1
+
+# CHECK-ASM-AND-OBJ: ssload x1
+# CHECK-ASM: encoding: [0xf3,0x40,0xc0,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssload ra
+
+# CHECK-ASM-AND-OBJ: ssload x5
+# CHECK-ASM: encoding: [0xf3,0x42,0xc0,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssload x5
+
+# CHECK-ASM-AND-OBJ: ssload x5
+# CHECK-ASM: encoding: [0xf3,0x42,0xc0,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssload t0
+
+# CHECK-ASM-AND-OBJ: sspopchk x1
+# CHECK-ASM: encoding: [0x73,0xc0,0xc0,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk x1
+
+# CHECK-ASM-AND-OBJ: sspopchk x1
+# CHECK-ASM: encoding: [0x73,0xc0,0xc0,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk ra
+
+# CHECK-ASM-AND-OBJ: sspopchk x5
+# CHECK-ASM: encoding: [0x73,0xc0,0xc2,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk x5
+
+# CHECK-ASM-AND-OBJ: sspopchk x5
+# CHECK-ASM: encoding: [0x73,0xc0,0xc2,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspopchk t0
+
+# CHECK-ASM-AND-OBJ: sspinc 4
+# CHECK-ASM: encoding: [0x73,0x40,0xd2,0x81]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspinc 4
+
+# CHECK-ASM-AND-OBJ: sspush ra
+# CHECK-ASM: encoding: [0x73,0x40,0x10,0x8a]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush x1
+
+# CHECK-ASM-AND-OBJ: sspush ra
+# CHECK-ASM: encoding: [0x73,0x40,0x10,0x8a]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush ra
+
+# check-asm-and-obj: sspush t0
+# check-asm: encoding: [0x73,0x40,0x50,0x8a]
+# check-no-ext: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush x5
+
+# check-asm-and-obj: sspush t0
+# check-asm: encoding: [0x73,0x40,0x50,0x8a]
+# check-no-ext: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+sspush t0
+
+# CHECK-ASM-AND-OBJ: ssprr ra
+# CHECK-ASM: encoding: [0xf3,0x40,0x00,0x86]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssprr ra
+
+# CHECK-ASM-AND-OBJ: ssamoswap t0, zero, (a0)
+# CHECK-ASM: encoding: [0xf3,0x42,0x05,0x82]
+# CHECK-NO-EXT: error: instruction requires the following: 'Zicfiss' (Shadow stack)
+ssamoswap t0, x0, (a0)
+
+# CHECK-ASM-AND-OBJ: c.sspush x1
+# CHECK-ASM: encoding: [0x81,0x60]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions), 'Zicfiss' (Shadow stack)
+c.sspush x1
+
+# CHECK-ASM-AND-OBJ: c.sspush x1
+# CHECK-ASM: encoding: [0x81,0x60]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions), 'Zicfiss' (Shadow stack)
+c.sspush ra
+
+# CHECK-ASM-AND-OBJ: c.sspopchk x5
+# CHECK-ASM: encoding: [0x81,0x62]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions), 'Zicfiss' (Shadow stack)
+c.sspopchk x5
+
+# CHECK-ASM-AND-OBJ: c.sspopchk x5
+# CHECK-ASM: encoding: [0x81,0x62]
+# CHECK-NO-EXT: error: instruction requires the following: 'C' (Compressed Instructions), 'Zicfiss' (Shadow stack)
+c.sspopchk t0
Index: llvm/test/MC/RISCV/zicfiss-invalid.s
===================================================================
--- /dev/null
+++ llvm/test/MC/RISCV/zicfiss-invalid.s
@@ -0,0 +1,28 @@
+# RUN: not llvm-mc %s -triple=riscv32 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: 2>&1 | FileCheck -check-prefixes=CHECK-ERR %s
+# RUN: not llvm-mc %s -triple=riscv32 -mattr=+experimental-zicfiss,+c -riscv-no-aliases -show-encoding \
+# RUN: 2>&1 | FileCheck -check-prefixes=CHECK-ERR %s
+
+# CHECK-ERR: error: invalid operand for instruction
+ssload a0
+
+# CHECK-ERR: error: invalid operand for instruction
+sspopchk a1
+
+# CHECK-ERR: error: invalid operand for instruction
+c.sspush t0
+
+# CHECK-ERR: error: invalid operand for instruction
+c.sspopchk ra
+
+# CHECK-ERR: error: immediate must be an integer in the range [1, 31]
+sspinc 32
+
+# CHECK-ERR: error: invalid operand for instruction
+sspush a0
+
+# CHECK-ERR: error: invalid operand for instruction
+ssprr zero
+
+# CHECK-ERR: error: invalid operand for instruction
+ssamoswap zero, x0, (a0)
Index: llvm/test/MC/RISCV/attribute-arch.s
===================================================================
--- llvm/test/MC/RISCV/attribute-arch.s
+++ llvm/test/MC/RISCV/attribute-arch.s
@@ -290,3 +290,6 @@
.attribute arch, "rv32i_xcvmac"
# CHECK: attribute 5, "rv32i2p1_xcvmac1p0"
+
+.attribute arch, "rv32i_zicfiss0p1"
+# CHECK: .attribute 5, "rv32i2p1_zicfiss0p1"
Index: llvm/lib/Target/RISCV/RISCVRegisterInfo.td
===================================================================
--- llvm/lib/Target/RISCV/RISCVRegisterInfo.td
+++ llvm/lib/Target/RISCV/RISCVRegisterInfo.td
@@ -174,6 +174,10 @@
let RegInfos = XLenRI;
}
+def GPRRA : RegisterClass<"RISCV", [XLenVT], 32, (add X1, X5)> {
+ let RegInfos = XLenRI;
+}
+
// Floating point registers
let RegAltNameIndices = [ABIRegAltName] in {
def F0_H : RISCVReg16<0, "f0", ["ft0"]>, DwarfRegNum<[32]>;
@@ -595,3 +599,6 @@
// Special registers
def FFLAGS : RISCVReg<0, "fflags">;
def FRM : RISCVReg<0, "frm">;
+
+// Shadow Stack register
+def SSP : RISCVReg<0, "ssp">;
Index: llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
===================================================================
--- llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
+++ llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
@@ -118,6 +118,9 @@
markSuperRegs(Reserved, RISCV::FRM);
markSuperRegs(Reserved, RISCV::FFLAGS);
+ // Shadow stack pointer.
+ markSuperRegs(Reserved, RISCV::SSP);
+
assert(checkAllSuperRegsMarked(Reserved));
return Reserved;
}
Index: llvm/lib/Target/RISCV/RISCVInstrInfoZicfiss.td
===================================================================
--- /dev/null
+++ llvm/lib/Target/RISCV/RISCVInstrInfoZicfiss.td
@@ -0,0 +1,96 @@
+//===-------- RISCVInstrInfoZicfiss.td - RISC-V CFG -*- tablegen -*--------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+// Operand definitions.
+//===----------------------------------------------------------------------===//
+
+def uimm5nonzero : Operand<XLenVT>,
+ ImmLeaf<XLenVT, [{return (Imm != 0) && isUInt<5>(Imm);}]> {
+ let ParserMatchClass = UImmAsmOperand<5, "NonZero">;
+ let EncoderMethod = "getImmOpValue";
+ let DecoderMethod = "decodeUImmNonZeroOperand<5>";
+ let OperandType = "OPERAND_UIMM5_NONZERO";
+ let OperandNamespace = "RISCVOp";
+ let MCOperandPredicate = [{
+ int64_t Imm;
+ if (MCOp.evaluateAsConstantImm(Imm))
+ return (Imm != 0) && isUInt<5>(Imm);
+ return MCOp.isBareSymbolRef();
+ }];
+}
+
+//===----------------------------------------------------------------------===//
+// Instruction class templates
+//===----------------------------------------------------------------------===//
+
+let Uses = [SSP] in {
+let hasSideEffects = 0, mayLoad = 1, mayStore = 0 in
+class RV_SSPop<bits<5> _rd, bits<5> _rs1, string opcodestr, string argstr> :
+ RVInstI<0b100, OPC_SYSTEM, (outs GPR:$rd), (ins GPR:$rs1), opcodestr, argstr> {
+ let rd = _rd;
+ let rs1 = _rs1;
+ let imm12 = 0b100000011100;
+}
+} // Uses = [SSP]
+
+class RVC_SSInst<bits<5> rs1, string opcodestr, string argstr> :
+ RVInst16<(outs), (ins:$rs1), opcodestr, argstr, [], InstFormatOther> {
+ let Inst{15-13} = 0b011;
+ let Inst{12} = 0;
+ let Inst{11-7} = rs1;
+ let Inst{6-2} = 0b00000;
+ let Inst{1-0} = 0b01;
+}
+
+//===----------------------------------------------------------------------===//
+// Instructions
+//===----------------------------------------------------------------------===//
+
+let Predicates = [HasStdExtZicfiss] in {
+def SSLoadX1: RV_SSPop<0b00001, 0b00000, "ssload", "x1">;
+def SSLoadX5: RV_SSPop<0b00101, 0b00000, "ssload", "x5">;
+let Defs = [SSP] in {
+def SSPopChkX1: RV_SSPop<0b00000, 0b00001, "sspopchk", "x1">;
+def SSPopChkX5: RV_SSPop<0b00000, 0b00101, "sspopchk", "x5">;
+} // Defs = [SSP]
+
+let Uses = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 0 in {
+def SSPINC : RVInstI<0b100, OPC_SYSTEM, (outs), (ins uimm5nonzero:$rs1),
+ "sspinc", "$rs1"> {
+ let imm12 = 0b100000011101;
+ let rd = 0b00000;
+}
+
+def SSPRR : RVInstR<0b1000011, 0b100, OPC_SYSTEM, (outs GPRNoX0:$rd), (ins),
+ "ssprr", "$rd"> {
+ let rs2 = 0b00000;
+ let rs1 = 0b00000;
+}
+} // Uses = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 0
+
+let Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 1 in {
+def SSPUSH : RVInstR<0b1000101, 0b100, OPC_SYSTEM, (outs), (ins GPRRA:$rs2),
+ "sspush", "$rs2"> {
+ let rd = 0b00000;
+ let rs1 = 0b00000;
+}
+
+def SSAMOSWAP :
+ RVInstRAtomic<0b10000, 0, 1, 0b100, OPC_SYSTEM, (outs GPRNoX0:$rd),
+ (ins GPR:$rs2, GPR:$rs1), "ssamoswap", "$rd, $rs2, (${rs1})">;
+} // Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 1
+} // Predicates = [HasStdExtZicfiss]
+
+let Predicates = [HasStdExtZicfiss, HasStdExtC] in {
+let Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
+def C_SSPUSHX1 : RVC_SSInst<0b00001, "c.sspush", "x1">;
+
+let Uses = [SSP], Defs = [SSP], hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
+def C_SSPopChkX5 : RVC_SSInst<0b00101, "c.sspopchk", "x5">;
+}// Predicates = [HasStdExtZicfiss, HasStdExtC]
Index: llvm/lib/Target/RISCV/RISCVInstrInfo.td
===================================================================
--- llvm/lib/Target/RISCV/RISCVInstrInfo.td
+++ llvm/lib/Target/RISCV/RISCVInstrInfo.td
@@ -230,6 +230,13 @@
let OperandNamespace = "RISCVOp";
}
+def uimm10 : Operand<XLenVT>, ImmLeaf<XLenVT, [{return isUInt<10>(Imm);}]> {
+ let ParserMatchClass = UImmAsmOperand<10>;
+ let DecoderMethod = "decodeUImmOperand<10>";
+ let OperandType = "OPERAND_UIMM10";
+ let OperandNamespace = "RISCVOp";
+}
+
def InsnDirectiveOpcode : AsmOperandClass {
let Name = "InsnDirectiveOpcode";
let ParserMethod = "parseInsnDirectiveOpcode";
@@ -1962,6 +1969,9 @@
include "RISCVInstrInfoC.td"
include "RISCVInstrInfoZc.td"
+// Control Flow Integerity
+include "RISCVInstrInfoZicfiss.td"
+
//===----------------------------------------------------------------------===//
// Vendor extensions
//===----------------------------------------------------------------------===//
Index: llvm/lib/Target/RISCV/RISCVFeatures.td
===================================================================
--- llvm/lib/Target/RISCV/RISCVFeatures.td
+++ llvm/lib/Target/RISCV/RISCVFeatures.td
@@ -79,6 +79,13 @@
AssemblerPredicate<(all_of FeatureStdExtZihintntl),
"'Zihintntl' (Non-Temporal Locality Hints)">;
+def FeatureStdExtZicfiss
+ : SubtargetFeature<"experimental-zicfiss", "HasStdExtZicfiss", "true",
+ "'Zicfiss' (Shadow stack)">;
+def HasStdExtZicfiss : Predicate<"Subtarget->hasStdExtZicfiss()">,
+ AssemblerPredicate<(all_of FeatureStdExtZicfiss),
+ "'Zicfiss' (Shadow stack)">;
+
def FeatureStdExtZifencei
: SubtargetFeature<"zifencei", "HasStdExtZifencei", "true",
"'Zifencei' (fence.i)">;
Index: llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
===================================================================
--- llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
+++ llvm/lib/Target/RISCV/MCTargetDesc/RISCVBaseInfo.h
@@ -244,6 +244,7 @@
OPERAND_UIMM3,
OPERAND_UIMM4,
OPERAND_UIMM5,
+ OPERAND_UIMM5_NONZERO,
OPERAND_UIMM6,
OPERAND_UIMM7,
OPERAND_UIMM7_LSB00,
@@ -252,6 +253,7 @@
OPERAND_UIMM8_LSB000,
OPERAND_UIMM8_GE32,
OPERAND_UIMM9_LSB000,
+ OPERAND_UIMM10,
OPERAND_UIMM10_LSB00_NONZERO,
OPERAND_UIMM12,
OPERAND_ZERO,
Index: llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
===================================================================
--- llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -74,6 +74,17 @@
return MCDisassembler::Success;
}
+static DecodeStatus DecodeGPRRARegisterClass(MCInst &Inst, uint32_t RegNo,
+ uint64_t Address,
+ const MCDisassembler *Decoder) {
+ MCRegister Reg = RISCV::X0 + RegNo;
+ if (Reg != RISCV::X1 && Reg != RISCV::X5)
+ return MCDisassembler::Fail;
+
+ Inst.addOperand(MCOperand::createReg(Reg));
+ return MCDisassembler::Success;
+}
+
static DecodeStatus DecodeFPR16RegisterClass(MCInst &Inst, uint32_t RegNo,
uint64_t Address,
const MCDisassembler *Decoder) {
Index: llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
===================================================================
--- llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
+++ llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp
@@ -660,6 +660,18 @@
bool isUImm6() const { return IsUImm<6>(); }
bool isUImm7() const { return IsUImm<7>(); }
bool isUImm8() const { return IsUImm<8>(); }
+ bool isUImm10() const { return IsUImm<10>(); }
+
+ bool isUImm5NonZero() const {
+ if (!isImm())
+ return false;
+ RISCVMCExpr::VariantKind VK = RISCVMCExpr::VK_RISCV_None;
+ int64_t Imm;
+ bool IsConstantImm = evaluateConstantImm(getImm(), Imm, VK);
+ return IsConstantImm && Imm != 0 &&
+ isUInt<5>(fixImmediateForRV32(Imm, isRV64Imm())) &&
+ VK == RISCVMCExpr::VK_RISCV_None;
+ }
bool isUImm8GE32() const {
int64_t Imm;
@@ -1406,12 +1418,16 @@
return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 4) - 1);
case Match_InvalidUImm5:
return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 5) - 1);
+ case Match_InvalidUImm5NonZero:
+ return generateImmOutOfRangeError(Operands, ErrorInfo, 1, (1 << 5) - 1);
case Match_InvalidUImm6:
return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 6) - 1);
case Match_InvalidUImm7:
return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 7) - 1);
case Match_InvalidUImm8:
return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 8) - 1);
+ case Match_InvalidUImm10:
+ return generateImmOutOfRangeError(Operands, ErrorInfo, 0, (1 << 10) - 1);
case Match_InvalidUImm8GE32:
return generateImmOutOfRangeError(Operands, ErrorInfo, 32, (1 << 8) - 1);
case Match_InvalidSImm5:
Index: llvm/lib/Support/RISCVISAInfo.cpp
===================================================================
--- llvm/lib/Support/RISCVISAInfo.cpp
+++ llvm/lib/Support/RISCVISAInfo.cpp
@@ -164,6 +164,7 @@
{"zfa", RISCVExtensionVersion{0, 2}},
{"zfbfmin", RISCVExtensionVersion{0, 6}},
+ {"zicfiss", RISCVExtensionVersion{0, 1}},
{"zicond", RISCVExtensionVersion{1, 0}},
{"zihintntl", RISCVExtensionVersion{0, 2}},
Index: clang/test/Preprocessor/riscv-target-features.c
===================================================================
--- clang/test/Preprocessor/riscv-target-features.c
+++ clang/test/Preprocessor/riscv-target-features.c
@@ -73,6 +73,7 @@
// CHECK-NOT: __riscv_zvfbfmin {{.*$}}
// CHECK-NOT: __riscv_zvfbfwma {{.*$}}
// CHECK-NOT: __riscv_zacas {{.*$}}
+// CHECK-NOT: __riscv_zicfiss {{.*$}}
// RUN: %clang -target riscv32-unknown-linux-gnu -march=rv32i -x c -E -dM %s \
// RUN: -o - | FileCheck %s
@@ -780,3 +781,11 @@
// RUN: -march=rv64i_zacas1p0 -x c -E -dM %s \
// RUN: -o - | FileCheck --check-prefix=CHECK-ZACAS-EXT %s
// CHECK-ZACAS-EXT: __riscv_zacas 1000000{{$}}
+
+// RUN: %clang -target riscv32 -menable-experimental-extensions \
+// RUN: -march=rv32izicfiss0p1 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZICFISS-EXT %s
+// RUN: %clang -target riscv64 -menable-experimental-extensions \
+// RUN: -march=rv64izicfiss0p1 -x c -E -dM %s \
+// RUN: -o - | FileCheck --check-prefix=CHECK-ZICFISS-EXT %s
+// CHECK-ZICFISS-EXT: __riscv_zicfiss 1000{{$}}
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