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-rw-r--r--llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp14
-rw-r--r--llvm/lib/Target/RISCV/RISCVInstrInfoC.td184
2 files changed, 100 insertions, 98 deletions
diff --git a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
index 932bc710508..563edc9e29d 100644
--- a/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
+++ b/llvm/lib/Target/RISCV/Disassembler/RISCVDisassembler.cpp
@@ -186,14 +186,16 @@ static DecodeStatus DecodeGPRCRegisterClass(MCInst &Inst, uint64_t RegNo,
// Add implied SP operand for instructions *SP compressed instructions. The SP
// operand isn't explicitly encoded in the instruction.
static void addImplySP(MCInst &Inst, int64_t Address, const void *Decoder) {
- if (Inst.getOpcode() == RISCV::CLWSP || Inst.getOpcode() == RISCV::CSWSP ||
- Inst.getOpcode() == RISCV::CLDSP || Inst.getOpcode() == RISCV::CSDSP ||
- Inst.getOpcode() == RISCV::CFLWSP || Inst.getOpcode() == RISCV::CFSWSP ||
- Inst.getOpcode() == RISCV::CFLDSP || Inst.getOpcode() == RISCV::CFSDSP ||
- Inst.getOpcode() == RISCV::CADDI4SPN) {
+ if (Inst.getOpcode() == RISCV::C_LWSP || Inst.getOpcode() == RISCV::C_SWSP ||
+ Inst.getOpcode() == RISCV::C_LDSP || Inst.getOpcode() == RISCV::C_SDSP ||
+ Inst.getOpcode() == RISCV::C_FLWSP ||
+ Inst.getOpcode() == RISCV::C_FSWSP ||
+ Inst.getOpcode() == RISCV::C_FLDSP ||
+ Inst.getOpcode() == RISCV::C_FSDSP ||
+ Inst.getOpcode() == RISCV::C_ADDI4SPN) {
DecodeGPRRegisterClass(Inst, 2, Address, Decoder);
}
- if (Inst.getOpcode() == RISCV::CADDI16SP) {
+ if (Inst.getOpcode() == RISCV::C_ADDI16SP) {
DecodeGPRRegisterClass(Inst, 2, Address, Decoder);
DecodeGPRRegisterClass(Inst, 2, Address, Decoder);
}
diff --git a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
index 04d1e1bbdb8..518f5633585 100644
--- a/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
+++ b/llvm/lib/Target/RISCV/RISCVInstrInfoC.td
@@ -101,32 +101,32 @@ def simm12_lsb0 : Operand<OtherVT> {
let hasSideEffects = 0, mayLoad = 1, mayStore = 0 in
class CStackLoad<bits<3> funct3, string OpcodeStr,
- RegisterClass cls, DAGOperand opnd> :
- RVInst16CI<funct3, 0b10, (outs cls:$rd), (ins SP:$rs1, opnd:$imm),
+ RegisterClass cls, DAGOperand opnd>
+ : RVInst16CI<funct3, 0b10, (outs cls:$rd), (ins SP:$rs1, opnd:$imm),
OpcodeStr, "$rd, ${imm}(${rs1})">;
let hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
class CStackStore<bits<3> funct3, string OpcodeStr,
- RegisterClass cls, DAGOperand opnd> :
- RVInst16CSS<funct3, 0b10, (outs), (ins cls:$rs2, SP:$rs1, opnd:$imm),
+ RegisterClass cls, DAGOperand opnd>
+ : RVInst16CSS<funct3, 0b10, (outs), (ins cls:$rs2, SP:$rs1, opnd:$imm),
OpcodeStr, "$rs2, ${imm}(${rs1})">;
let hasSideEffects = 0, mayLoad = 1, mayStore = 0 in
class CLoad_ri<bits<3> funct3, string OpcodeStr,
- RegisterClass cls, DAGOperand opnd> :
- RVInst16CL<funct3, 0b00, (outs cls:$rd), (ins GPRC:$rs1, opnd:$imm),
+ RegisterClass cls, DAGOperand opnd>
+ : RVInst16CL<funct3, 0b00, (outs cls:$rd), (ins GPRC:$rs1, opnd:$imm),
OpcodeStr, "$rd, ${imm}(${rs1})">;
let hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
class CStore_rri<bits<3> funct3, string OpcodeStr,
- RegisterClass cls, DAGOperand opnd> :
- RVInst16CS<funct3, 0b00, (outs), (ins cls:$rs2, GPRC:$rs1, opnd:$imm),
+ RegisterClass cls, DAGOperand opnd>
+ : RVInst16CS<funct3, 0b00, (outs), (ins cls:$rs2, GPRC:$rs1, opnd:$imm),
OpcodeStr, "$rs2, ${imm}(${rs1})">;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
class Bcz<bits<3> funct3, string OpcodeStr, PatFrag CondOp,
- RegisterClass cls> :
- RVInst16CB<funct3, 0b01, (outs), (ins cls:$rs1, simm9_lsb0:$imm),
+ RegisterClass cls>
+ : RVInst16CB<funct3, 0b01, (outs), (ins cls:$rs1, simm9_lsb0:$imm),
OpcodeStr, "$rs1, $imm"> {
let isBranch = 1;
let isTerminator = 1;
@@ -139,8 +139,8 @@ class Bcz<bits<3> funct3, string OpcodeStr, PatFrag CondOp,
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
class Shift_right<bits<2> funct2, string OpcodeStr, RegisterClass cls,
- Operand ImmOpnd> :
- RVInst16CB<0b100, 0b01, (outs cls:$rs1_wb), (ins cls:$rs1, ImmOpnd:$imm),
+ Operand ImmOpnd>
+ : RVInst16CB<0b100, 0b01, (outs cls:$rs1_wb), (ins cls:$rs1, ImmOpnd:$imm),
OpcodeStr, "$rs1, $imm"> {
let Constraints = "$rs1 = $rs1_wb";
let Inst{12} = imm{5};
@@ -150,8 +150,8 @@ class Shift_right<bits<2> funct2, string OpcodeStr, RegisterClass cls,
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
class CS_ALU<bits<2> funct2, string OpcodeStr, RegisterClass cls,
- bit RV64only> :
- RVInst16CS<0b100, 0b01, (outs cls:$rd_wb), (ins cls:$rd, cls:$rs2),
+ bit RV64only>
+ : RVInst16CS<0b100, 0b01, (outs cls:$rd_wb), (ins cls:$rd, cls:$rs2),
OpcodeStr, "$rd, $rs2"> {
bits<3> rd;
let Constraints = "$rd = $rd_wb";
@@ -168,9 +168,9 @@ class CS_ALU<bits<2> funct2, string OpcodeStr, RegisterClass cls,
let Predicates = [HasStdExtC] in {
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CADDI4SPN : RVInst16CIW<0b000, 0b00, (outs GPRC:$rd),
- (ins SP:$rs1, uimm10_lsb00nonzero:$imm),
- "c.addi4spn", "$rd, $rs1, $imm"> {
+def C_ADDI4SPN : RVInst16CIW<0b000, 0b00, (outs GPRC:$rd),
+ (ins SP:$rs1, uimm10_lsb00nonzero:$imm),
+ "c.addi4spn", "$rd, $rs1, $imm"> {
bits<5> rs1;
let Inst{12-11} = imm{5-4};
let Inst{10-7} = imm{9-6};
@@ -178,14 +178,14 @@ def CADDI4SPN : RVInst16CIW<0b000, 0b00, (outs GPRC:$rd),
let Inst{5} = imm{3};
}
-def CFLD : CLoad_ri<0b001, "c.fld", FPR64C, uimm8_lsb000>,
- Requires<[HasStdExtD]> {
+def C_FLD : CLoad_ri<0b001, "c.fld", FPR64C, uimm8_lsb000>,
+ Requires<[HasStdExtD]> {
bits<8> imm;
let Inst{12-10} = imm{5-3};
let Inst{6-5} = imm{7-6};
}
-def CLW : CLoad_ri<0b010, "c.lw", GPRC, uimm7_lsb00> {
+def C_LW : CLoad_ri<0b010, "c.lw", GPRC, uimm7_lsb00> {
bits<7> imm;
let Inst{12-10} = imm{5-3};
let Inst{6} = imm{2};
@@ -193,29 +193,29 @@ def CLW : CLoad_ri<0b010, "c.lw", GPRC, uimm7_lsb00> {
}
let DecoderNamespace = "RISCV32Only_" in
-def CFLW : CLoad_ri<0b011, "c.flw", FPR32C, uimm7_lsb00>,
- Requires<[HasStdExtF, IsRV32]> {
+def C_FLW : CLoad_ri<0b011, "c.flw", FPR32C, uimm7_lsb00>,
+ Requires<[HasStdExtF, IsRV32]> {
bits<7> imm;
let Inst{12-10} = imm{5-3};
let Inst{6} = imm{2};
let Inst{5} = imm{6};
}
-def CLD : CLoad_ri<0b011, "c.ld", GPRC, uimm8_lsb000>,
- Requires<[IsRV64]> {
+def C_LD : CLoad_ri<0b011, "c.ld", GPRC, uimm8_lsb000>,
+ Requires<[IsRV64]> {
bits<8> imm;
let Inst{12-10} = imm{5-3};
let Inst{6-5} = imm{7-6};
}
-def CFSD : CStore_rri<0b101, "c.fsd", FPR64C, uimm8_lsb000>,
- Requires<[HasStdExtD]> {
+def C_FSD : CStore_rri<0b101, "c.fsd", FPR64C, uimm8_lsb000>,
+ Requires<[HasStdExtD]> {
bits<8> imm;
let Inst{12-10} = imm{5-3};
let Inst{6-5} = imm{7-6};
}
-def CSW : CStore_rri<0b110, "c.sw", GPRC, uimm7_lsb00> {
+def C_SW : CStore_rri<0b110, "c.sw", GPRC, uimm7_lsb00> {
bits<7> imm;
let Inst{12-10} = imm{5-3};
let Inst{6} = imm{2};
@@ -223,57 +223,57 @@ def CSW : CStore_rri<0b110, "c.sw", GPRC, uimm7_lsb00> {
}
let DecoderNamespace = "RISCV32Only_" in
-def CFSW : CStore_rri<0b111, "c.fsw", FPR32C, uimm7_lsb00>,
- Requires<[HasStdExtF, IsRV32]> {
+def C_FSW : CStore_rri<0b111, "c.fsw", FPR32C, uimm7_lsb00>,
+ Requires<[HasStdExtF, IsRV32]> {
bits<7> imm;
let Inst{12-10} = imm{5-3};
let Inst{6} = imm{2};
let Inst{5} = imm{6};
}
-def CSD : CStore_rri<0b111, "c.sd", GPRC, uimm8_lsb000>,
- Requires<[IsRV64]> {
+def C_SD : CStore_rri<0b111, "c.sd", GPRC, uimm8_lsb000>,
+ Requires<[IsRV64]> {
bits<8> imm;
let Inst{12-10} = imm{5-3};
let Inst{6-5} = imm{7-6};
}
let rd = 0, imm = 0, hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CNOP : RVInst16CI<0b000, 0b01, (outs), (ins), "c.nop", "">;
+def C_NOP : RVInst16CI<0b000, 0b01, (outs), (ins), "c.nop", "">;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CADDI : RVInst16CI<0b000, 0b01, (outs GPRNoX0:$rd_wb),
- (ins GPRNoX0:$rd, simm6:$imm),
- "c.addi", "$rd, $imm"> {
+def C_ADDI : RVInst16CI<0b000, 0b01, (outs GPRNoX0:$rd_wb),
+ (ins GPRNoX0:$rd, simm6:$imm),
+ "c.addi", "$rd, $imm"> {
let Constraints = "$rd = $rd_wb";
let Inst{6-2} = imm{4-0};
}
let hasSideEffects = 0, mayLoad = 0, mayStore = 0, isCall = 1,
-DecoderNamespace = "RISCV32Only_" in
-def CJAL : RVInst16CJ<0b001, 0b01, (outs), (ins simm12_lsb0:$offset),
- "c.jal", "$offset">,
- Requires<[IsRV32]>;
+ DecoderNamespace = "RISCV32Only_" in
+def C_JAL : RVInst16CJ<0b001, 0b01, (outs), (ins simm12_lsb0:$offset),
+ "c.jal", "$offset">,
+ Requires<[IsRV32]>;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CADDIW : RVInst16CI<0b001, 0b01, (outs GPRNoX0:$rd_wb),
- (ins GPRNoX0:$rd, simm6:$imm),
- "c.addiw", "$rd, $imm">,
- Requires<[IsRV64]> {
+def C_ADDIW : RVInst16CI<0b001, 0b01, (outs GPRNoX0:$rd_wb),
+ (ins GPRNoX0:$rd, simm6:$imm),
+ "c.addiw", "$rd, $imm">,
+ Requires<[IsRV64]> {
let Constraints = "$rd = $rd_wb";
let Inst{6-2} = imm{4-0};
}
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CLI : RVInst16CI<0b010, 0b01, (outs GPRNoX0:$rd), (ins simm6:$imm),
- "c.li", "$rd, $imm"> {
+def C_LI : RVInst16CI<0b010, 0b01, (outs GPRNoX0:$rd), (ins simm6:$imm),
+ "c.li", "$rd, $imm"> {
let Inst{6-2} = imm{4-0};
}
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CADDI16SP : RVInst16CI<0b011, 0b01, (outs SP:$rd_wb),
- (ins SP:$rd, simm10_lsb0000:$imm),
- "c.addi16sp", "$rd, $imm"> {
+def C_ADDI16SP : RVInst16CI<0b011, 0b01, (outs SP:$rd_wb),
+ (ins SP:$rd, simm10_lsb0000:$imm),
+ "c.addi16sp", "$rd, $imm"> {
let Constraints = "$rd = $rd_wb";
let Inst{12} = imm{9};
let Inst{11-7} = 2;
@@ -284,78 +284,78 @@ def CADDI16SP : RVInst16CI<0b011, 0b01, (outs SP:$rd_wb),
}
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CLUI : RVInst16CI<0b011, 0b01, (outs GPRNoX0X2:$rd),
- (ins uimm6nonzero:$imm),
- "c.lui", "$rd, $imm"> {
+def C_LUI : RVInst16CI<0b011, 0b01, (outs GPRNoX0X2:$rd),
+ (ins uimm6nonzero:$imm),
+ "c.lui", "$rd, $imm"> {
let Inst{6-2} = imm{4-0};
}
-def CSRLI : Shift_right<0b00, "c.srli", GPRC, uimm5nonzero>;
-def CSRAI : Shift_right<0b01, "c.srai", GPRC, uimm5nonzero>;
+def C_SRLI : Shift_right<0b00, "c.srli", GPRC, uimm5nonzero>;
+def C_SRAI : Shift_right<0b01, "c.srai", GPRC, uimm5nonzero>;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CANDI : RVInst16CB<0b100, 0b01, (outs GPRC:$rs1_wb), (ins GPRC:$rs1, simm6:$imm),
- "c.andi", "$rs1, $imm"> {
+def C_ANDI : RVInst16CB<0b100, 0b01, (outs GPRC:$rs1_wb), (ins GPRC:$rs1, simm6:$imm),
+ "c.andi", "$rs1, $imm"> {
let Constraints = "$rs1 = $rs1_wb";
let Inst{12} = imm{5};
let Inst{11-10} = 0b10;
let Inst{6-2} = imm{4-0};
}
-def CSUB : CS_ALU<0b00, "c.sub", GPRC, 0>;
-def CXOR : CS_ALU<0b01, "c.xor", GPRC, 0>;
-def COR : CS_ALU<0b10, "c.or" , GPRC, 0>;
-def CAND : CS_ALU<0b11, "c.and", GPRC, 0>;
+def C_SUB : CS_ALU<0b00, "c.sub", GPRC, 0>;
+def C_XOR : CS_ALU<0b01, "c.xor", GPRC, 0>;
+def C_OR : CS_ALU<0b10, "c.or" , GPRC, 0>;
+def C_AND : CS_ALU<0b11, "c.and", GPRC, 0>;
-def CSUBW : CS_ALU<0b00, "c.subw", GPRC, 1>, Requires<[IsRV64]>;
-def CADDW : CS_ALU<0b01, "c.addw", GPRC, 1>, Requires<[IsRV64]>;
+def C_SUBW : CS_ALU<0b00, "c.subw", GPRC, 1>, Requires<[IsRV64]>;
+def C_ADDW : CS_ALU<0b01, "c.addw", GPRC, 1>, Requires<[IsRV64]>;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CJ : RVInst16CJ<0b101, 0b01, (outs), (ins simm12_lsb0:$offset),
- "c.j", "$offset"> {
+def C_J : RVInst16CJ<0b101, 0b01, (outs), (ins simm12_lsb0:$offset),
+ "c.j", "$offset"> {
let isBranch = 1;
let isTerminator=1;
let isBarrier=1;
}
-def CBEQZ : Bcz<0b110, "c.beqz", seteq, GPRC>;
-def CBNEZ : Bcz<0b111, "c.bnez", setne, GPRC>;
+def C_BEQZ : Bcz<0b110, "c.beqz", seteq, GPRC>;
+def C_BNEZ : Bcz<0b111, "c.bnez", setne, GPRC>;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CSLLI : RVInst16CI<0b000, 0b10, (outs GPRNoX0:$rd_wb),
- (ins GPRNoX0:$rd, uimm5nonzero:$imm),
- "c.slli" ,"$rd, $imm"> {
+def C_SLLI : RVInst16CI<0b000, 0b10, (outs GPRNoX0:$rd_wb),
+ (ins GPRNoX0:$rd, uimm5nonzero:$imm),
+ "c.slli" ,"$rd, $imm"> {
let Constraints = "$rd = $rd_wb";
let Inst{6-2} = imm{4-0};
}
-def CFLDSP : CStackLoad<0b001, "c.fldsp", FPR64, uimm9_lsb000>,
- Requires<[HasStdExtD]> {
+def C_FLDSP : CStackLoad<0b001, "c.fldsp", FPR64, uimm9_lsb000>,
+ Requires<[HasStdExtD]> {
let Inst{6-5} = imm{4-3};
let Inst{4-2} = imm{8-6};
}
-def CLWSP : CStackLoad<0b010, "c.lwsp", GPRNoX0, uimm8_lsb00> {
+def C_LWSP : CStackLoad<0b010, "c.lwsp", GPRNoX0, uimm8_lsb00> {
let Inst{6-4} = imm{4-2};
let Inst{3-2} = imm{7-6};
}
let DecoderNamespace = "RISCV32Only_" in
-def CFLWSP : CStackLoad<0b011, "c.flwsp", FPR32, uimm8_lsb00>,
- Requires<[HasStdExtF, IsRV32]> {
+def C_FLWSP : CStackLoad<0b011, "c.flwsp", FPR32, uimm8_lsb00>,
+ Requires<[HasStdExtF, IsRV32]> {
let Inst{6-4} = imm{4-2};
let Inst{3-2} = imm{7-6};
}
-def CLDSP : CStackLoad<0b011, "c.ldsp", GPRNoX0, uimm9_lsb000>,
- Requires<[IsRV64]> {
+def C_LDSP : CStackLoad<0b011, "c.ldsp", GPRNoX0, uimm9_lsb000>,
+ Requires<[IsRV64]> {
let Inst{6-5} = imm{4-3};
let Inst{4-2} = imm{8-6};
}
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CJR : RVInst16CR<0b1000, 0b10, (outs), (ins GPRNoX0:$rs1),
- "c.jr", "$rs1"> {
+def C_JR : RVInst16CR<0b1000, 0b10, (outs), (ins GPRNoX0:$rs1),
+ "c.jr", "$rs1"> {
let isBranch = 1;
let isBarrier = 1;
let isTerminator = 1;
@@ -364,44 +364,44 @@ def CJR : RVInst16CR<0b1000, 0b10, (outs), (ins GPRNoX0:$rs1),
}
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CMV : RVInst16CR<0b1000, 0b10, (outs GPRNoX0:$rs1), (ins GPRNoX0:$rs2),
- "c.mv", "$rs1, $rs2">;
+def C_MV : RVInst16CR<0b1000, 0b10, (outs GPRNoX0:$rs1), (ins GPRNoX0:$rs2),
+ "c.mv", "$rs1, $rs2">;
let rs1 = 0, rs2 = 0, hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CEBREAK : RVInst16CR<0b1001, 0b10, (outs), (ins), "c.ebreak", "">;
+def C_EBREAK : RVInst16CR<0b1001, 0b10, (outs), (ins), "c.ebreak", "">;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0,
isCall=1, Defs=[X1], rs2 = 0 in
-def CJALR : RVInst16CR<0b1001, 0b10, (outs), (ins GPRNoX0:$rs1),
- "c.jalr", "$rs1">;
+def C_JALR : RVInst16CR<0b1001, 0b10, (outs), (ins GPRNoX0:$rs1),
+ "c.jalr", "$rs1">;
let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
-def CADD : RVInst16CR<0b1001, 0b10, (outs GPRNoX0:$rs1_wb),
- (ins GPRNoX0:$rs1, GPRNoX0:$rs2),
- "c.add", "$rs1, $rs2"> {
+def C_ADD : RVInst16CR<0b1001, 0b10, (outs GPRNoX0:$rs1_wb),
+ (ins GPRNoX0:$rs1, GPRNoX0:$rs2),
+ "c.add", "$rs1, $rs2"> {
let Constraints = "$rs1 = $rs1_wb";
}
-def CFSDSP : CStackStore<0b101, "c.fsdsp", FPR64, uimm9_lsb000>,
- Requires<[HasStdExtD]> {
+def C_FSDSP : CStackStore<0b101, "c.fsdsp", FPR64, uimm9_lsb000>,
+ Requires<[HasStdExtD]> {
let Inst{12-10} = imm{5-3};
let Inst{9-7} = imm{8-6};
}
-def CSWSP : CStackStore<0b110, "c.swsp", GPR, uimm8_lsb00> {
+def C_SWSP : CStackStore<0b110, "c.swsp", GPR, uimm8_lsb00> {
let Inst{12-9} = imm{5-2};
let Inst{8-7} = imm{7-6};
}
let DecoderNamespace = "RISCV32Only_" in
-def CFSWSP : CStackStore<0b111, "c.fswsp", FPR32, uimm8_lsb00>,
- Requires<[HasStdExtF, IsRV32]> {
+def C_FSWSP : CStackStore<0b111, "c.fswsp", FPR32, uimm8_lsb00>,
+ Requires<[HasStdExtF, IsRV32]> {
let Inst{12-9} = imm{5-2};
let Inst{8-7} = imm{7-6};
}
-def CSDSP : CStackStore<0b111, "c.sdsp", GPR, uimm9_lsb000>,
- Requires<[IsRV64]> {
+def C_SDSP : CStackStore<0b111, "c.sdsp", GPR, uimm9_lsb000>,
+ Requires<[IsRV64]> {
let Inst{12-10} = imm{5-3};
let Inst{9-7} = imm{8-6};
}
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