forked from OSchip/llvm-project
396 lines
16 KiB
TableGen
396 lines
16 KiB
TableGen
//===-- RISCVInstrInfoF.td - RISC-V 'F' instructions -------*- tablegen -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes the RISC-V instructions from the standard 'F',
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// Single-Precision Floating-Point instruction set extension.
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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// RISC-V specific DAG Nodes.
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//===----------------------------------------------------------------------===//
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def SDT_RISCVFMV_W_X_RV64
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: SDTypeProfile<1, 1, [SDTCisVT<0, f32>, SDTCisVT<1, i64>]>;
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def SDT_RISCVFMV_X_ANYEXTW_RV64
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: SDTypeProfile<1, 1, [SDTCisVT<0, i64>, SDTCisVT<1, f32>]>;
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def riscv_fmv_w_x_rv64
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: SDNode<"RISCVISD::FMV_W_X_RV64", SDT_RISCVFMV_W_X_RV64>;
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def riscv_fmv_x_anyextw_rv64
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: SDNode<"RISCVISD::FMV_X_ANYEXTW_RV64", SDT_RISCVFMV_X_ANYEXTW_RV64>;
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//===----------------------------------------------------------------------===//
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// Operand and SDNode transformation definitions.
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//===----------------------------------------------------------------------===//
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// Floating-point rounding mode
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def FRMArg : AsmOperandClass {
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let Name = "FRMArg";
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let RenderMethod = "addFRMArgOperands";
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let DiagnosticType = "InvalidFRMArg";
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}
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def frmarg : Operand<XLenVT> {
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let ParserMatchClass = FRMArg;
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let PrintMethod = "printFRMArg";
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let DecoderMethod = "decodeFRMArg";
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}
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//===----------------------------------------------------------------------===//
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// Instruction class templates
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//===----------------------------------------------------------------------===//
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let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
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class FPFMAS_rrr_frm<RISCVOpcode opcode, string opcodestr>
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: RVInstR4<0b00, opcode, (outs FPR32:$rd),
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(ins FPR32:$rs1, FPR32:$rs2, FPR32:$rs3, frmarg:$funct3),
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opcodestr, "$rd, $rs1, $rs2, $rs3, $funct3">;
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class FPFMASDynFrmAlias<FPFMAS_rrr_frm Inst, string OpcodeStr>
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: InstAlias<OpcodeStr#" $rd, $rs1, $rs2, $rs3",
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(Inst FPR32:$rd, FPR32:$rs1, FPR32:$rs2, FPR32:$rs3, 0b111)>;
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let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
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class FPALUS_rr<bits<7> funct7, bits<3> funct3, string opcodestr>
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: RVInstR<funct7, funct3, OPC_OP_FP, (outs FPR32:$rd),
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(ins FPR32:$rs1, FPR32:$rs2), opcodestr, "$rd, $rs1, $rs2">;
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let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
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class FPALUS_rr_frm<bits<7> funct7, string opcodestr>
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: RVInstRFrm<funct7, OPC_OP_FP, (outs FPR32:$rd),
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(ins FPR32:$rs1, FPR32:$rs2, frmarg:$funct3), opcodestr,
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"$rd, $rs1, $rs2, $funct3">;
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class FPALUSDynFrmAlias<FPALUS_rr_frm Inst, string OpcodeStr>
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: InstAlias<OpcodeStr#" $rd, $rs1, $rs2",
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(Inst FPR32:$rd, FPR32:$rs1, FPR32:$rs2, 0b111)>;
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let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
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class FPUnaryOp_r<bits<7> funct7, bits<3> funct3, RegisterClass rdty,
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RegisterClass rs1ty, string opcodestr>
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: RVInstR<funct7, funct3, OPC_OP_FP, (outs rdty:$rd), (ins rs1ty:$rs1),
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opcodestr, "$rd, $rs1">;
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let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
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class FPUnaryOp_r_frm<bits<7> funct7, RegisterClass rdty, RegisterClass rs1ty,
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string opcodestr>
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: RVInstRFrm<funct7, OPC_OP_FP, (outs rdty:$rd),
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(ins rs1ty:$rs1, frmarg:$funct3), opcodestr,
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"$rd, $rs1, $funct3">;
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class FPUnaryOpDynFrmAlias<FPUnaryOp_r_frm Inst, string OpcodeStr,
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RegisterClass rdty, RegisterClass rs1ty>
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: InstAlias<OpcodeStr#" $rd, $rs1",
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(Inst rdty:$rd, rs1ty:$rs1, 0b111)>;
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let hasSideEffects = 0, mayLoad = 0, mayStore = 0 in
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class FPCmpS_rr<bits<3> funct3, string opcodestr>
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: RVInstR<0b1010000, funct3, OPC_OP_FP, (outs GPR:$rd),
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(ins FPR32:$rs1, FPR32:$rs2), opcodestr, "$rd, $rs1, $rs2">;
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//===----------------------------------------------------------------------===//
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// Instructions
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//===----------------------------------------------------------------------===//
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let Predicates = [HasStdExtF] in {
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let hasSideEffects = 0, mayLoad = 1, mayStore = 0 in
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def FLW : RVInstI<0b010, OPC_LOAD_FP, (outs FPR32:$rd),
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(ins GPR:$rs1, simm12:$imm12),
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"flw", "$rd, ${imm12}(${rs1})">;
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// Operands for stores are in the order srcreg, base, offset rather than
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// reflecting the order these fields are specified in the instruction
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// encoding.
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let hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
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def FSW : RVInstS<0b010, OPC_STORE_FP, (outs),
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(ins FPR32:$rs2, GPR:$rs1, simm12:$imm12),
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"fsw", "$rs2, ${imm12}(${rs1})">;
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def FMADD_S : FPFMAS_rrr_frm<OPC_MADD, "fmadd.s">;
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def : FPFMASDynFrmAlias<FMADD_S, "fmadd.s">;
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def FMSUB_S : FPFMAS_rrr_frm<OPC_MSUB, "fmsub.s">;
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def : FPFMASDynFrmAlias<FMSUB_S, "fmsub.s">;
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def FNMSUB_S : FPFMAS_rrr_frm<OPC_NMSUB, "fnmsub.s">;
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def : FPFMASDynFrmAlias<FNMSUB_S, "fnmsub.s">;
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def FNMADD_S : FPFMAS_rrr_frm<OPC_NMADD, "fnmadd.s">;
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def : FPFMASDynFrmAlias<FNMADD_S, "fnmadd.s">;
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def FADD_S : FPALUS_rr_frm<0b0000000, "fadd.s">;
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def : FPALUSDynFrmAlias<FADD_S, "fadd.s">;
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def FSUB_S : FPALUS_rr_frm<0b0000100, "fsub.s">;
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def : FPALUSDynFrmAlias<FSUB_S, "fsub.s">;
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def FMUL_S : FPALUS_rr_frm<0b0001000, "fmul.s">;
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def : FPALUSDynFrmAlias<FMUL_S, "fmul.s">;
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def FDIV_S : FPALUS_rr_frm<0b0001100, "fdiv.s">;
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def : FPALUSDynFrmAlias<FDIV_S, "fdiv.s">;
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def FSQRT_S : FPUnaryOp_r_frm<0b0101100, FPR32, FPR32, "fsqrt.s"> {
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let rs2 = 0b00000;
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}
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def : FPUnaryOpDynFrmAlias<FSQRT_S, "fsqrt.s", FPR32, FPR32>;
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def FSGNJ_S : FPALUS_rr<0b0010000, 0b000, "fsgnj.s">;
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def FSGNJN_S : FPALUS_rr<0b0010000, 0b001, "fsgnjn.s">;
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def FSGNJX_S : FPALUS_rr<0b0010000, 0b010, "fsgnjx.s">;
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def FMIN_S : FPALUS_rr<0b0010100, 0b000, "fmin.s">;
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def FMAX_S : FPALUS_rr<0b0010100, 0b001, "fmax.s">;
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def FCVT_W_S : FPUnaryOp_r_frm<0b1100000, GPR, FPR32, "fcvt.w.s"> {
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let rs2 = 0b00000;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_W_S, "fcvt.w.s", GPR, FPR32>;
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def FCVT_WU_S : FPUnaryOp_r_frm<0b1100000, GPR, FPR32, "fcvt.wu.s"> {
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let rs2 = 0b00001;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_WU_S, "fcvt.wu.s", GPR, FPR32>;
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def FMV_X_W : FPUnaryOp_r<0b1110000, 0b000, GPR, FPR32, "fmv.x.w"> {
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let rs2 = 0b00000;
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}
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def FEQ_S : FPCmpS_rr<0b010, "feq.s">;
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def FLT_S : FPCmpS_rr<0b001, "flt.s">;
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def FLE_S : FPCmpS_rr<0b000, "fle.s">;
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def FCLASS_S : FPUnaryOp_r<0b1110000, 0b001, GPR, FPR32, "fclass.s"> {
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let rs2 = 0b00000;
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}
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def FCVT_S_W : FPUnaryOp_r_frm<0b1101000, FPR32, GPR, "fcvt.s.w"> {
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let rs2 = 0b00000;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_S_W, "fcvt.s.w", FPR32, GPR>;
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def FCVT_S_WU : FPUnaryOp_r_frm<0b1101000, FPR32, GPR, "fcvt.s.wu"> {
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let rs2 = 0b00001;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_S_WU, "fcvt.s.wu", FPR32, GPR>;
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def FMV_W_X : FPUnaryOp_r<0b1111000, 0b000, FPR32, GPR, "fmv.w.x"> {
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let rs2 = 0b00000;
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}
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} // Predicates = [HasStdExtF]
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let Predicates = [HasStdExtF, IsRV64] in {
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def FCVT_L_S : FPUnaryOp_r_frm<0b1100000, GPR, FPR32, "fcvt.l.s"> {
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let rs2 = 0b00010;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_L_S, "fcvt.l.s", GPR, FPR32>;
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def FCVT_LU_S : FPUnaryOp_r_frm<0b1100000, GPR, FPR32, "fcvt.lu.s"> {
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let rs2 = 0b00011;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_LU_S, "fcvt.lu.s", GPR, FPR32>;
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def FCVT_S_L : FPUnaryOp_r_frm<0b1101000, FPR32, GPR, "fcvt.s.l"> {
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let rs2 = 0b00010;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_S_L, "fcvt.s.l", FPR32, GPR>;
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def FCVT_S_LU : FPUnaryOp_r_frm<0b1101000, FPR32, GPR, "fcvt.s.lu"> {
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let rs2 = 0b00011;
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}
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def : FPUnaryOpDynFrmAlias<FCVT_S_LU, "fcvt.s.lu", FPR32, GPR>;
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} // Predicates = [HasStdExtF, IsRV64]
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//===----------------------------------------------------------------------===//
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// Assembler Pseudo Instructions (User-Level ISA, Version 2.2, Chapter 20)
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//===----------------------------------------------------------------------===//
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let Predicates = [HasStdExtF] in {
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def : InstAlias<"flw $rd, (${rs1})", (FLW FPR32:$rd, GPR:$rs1, 0), 0>;
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def : InstAlias<"fsw $rs2, (${rs1})", (FSW FPR32:$rs2, GPR:$rs1, 0), 0>;
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def : InstAlias<"fmv.s $rd, $rs", (FSGNJ_S FPR32:$rd, FPR32:$rs, FPR32:$rs)>;
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def : InstAlias<"fabs.s $rd, $rs", (FSGNJX_S FPR32:$rd, FPR32:$rs, FPR32:$rs)>;
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def : InstAlias<"fneg.s $rd, $rs", (FSGNJN_S FPR32:$rd, FPR32:$rs, FPR32:$rs)>;
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// fgt.s/fge.s are recognised by the GNU assembler but the canonical
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// flt.s/fle.s forms will always be printed. Therefore, set a zero weight.
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def : InstAlias<"fgt.s $rd, $rs, $rt",
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(FLT_S GPR:$rd, FPR32:$rt, FPR32:$rs), 0>;
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def : InstAlias<"fge.s $rd, $rs, $rt",
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(FLE_S GPR:$rd, FPR32:$rt, FPR32:$rs), 0>;
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// The following csr instructions actually alias instructions from the base ISA.
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// However, it only makes sense to support them when the F extension is enabled.
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// NOTE: "frcsr", "frrm", and "frflags" are more specialized version of "csrr".
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def : InstAlias<"frcsr $rd", (CSRRS GPR:$rd, FCSR.Encoding, X0), 2>;
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def : InstAlias<"fscsr $rd, $rs", (CSRRW GPR:$rd, FCSR.Encoding, GPR:$rs)>;
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def : InstAlias<"fscsr $rs", (CSRRW X0, FCSR.Encoding, GPR:$rs), 2>;
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// frsr, fssr are obsolete aliases replaced by frcsr, fscsr, so give them
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// zero weight.
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def : InstAlias<"frsr $rd", (CSRRS GPR:$rd, FCSR.Encoding, X0), 0>;
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def : InstAlias<"fssr $rd, $rs", (CSRRW GPR:$rd, FCSR.Encoding, GPR:$rs), 0>;
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def : InstAlias<"fssr $rs", (CSRRW X0, FCSR.Encoding, GPR:$rs), 0>;
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def : InstAlias<"frrm $rd", (CSRRS GPR:$rd, FRM.Encoding, X0), 2>;
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def : InstAlias<"fsrm $rd, $rs", (CSRRW GPR:$rd, FRM.Encoding, GPR:$rs)>;
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def : InstAlias<"fsrm $rs", (CSRRW X0, FRM.Encoding, GPR:$rs), 2>;
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def : InstAlias<"fsrmi $rd, $imm", (CSRRWI GPR:$rd, FRM.Encoding, uimm5:$imm)>;
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def : InstAlias<"fsrmi $imm", (CSRRWI X0, FRM.Encoding, uimm5:$imm), 2>;
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def : InstAlias<"frflags $rd", (CSRRS GPR:$rd, FFLAGS.Encoding, X0), 2>;
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def : InstAlias<"fsflags $rd, $rs", (CSRRW GPR:$rd, FFLAGS.Encoding, GPR:$rs)>;
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def : InstAlias<"fsflags $rs", (CSRRW X0, FFLAGS.Encoding, GPR:$rs), 2>;
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def : InstAlias<"fsflagsi $rd, $imm", (CSRRWI GPR:$rd, FFLAGS.Encoding, uimm5:$imm)>;
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def : InstAlias<"fsflagsi $imm", (CSRRWI X0, FFLAGS.Encoding, uimm5:$imm), 2>;
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// fmv.w.x and fmv.x.w were previously known as fmv.s.x and fmv.x.s. Both
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// spellings should be supported by standard tools.
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def : MnemonicAlias<"fmv.s.x", "fmv.w.x">;
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def : MnemonicAlias<"fmv.x.s", "fmv.x.w">;
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def PseudoFLW : PseudoFloatLoad<"flw", FPR32>;
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def PseudoFSW : PseudoStore<"fsw", FPR32>;
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} // Predicates = [HasStdExtF]
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//===----------------------------------------------------------------------===//
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// Pseudo-instructions and codegen patterns
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//===----------------------------------------------------------------------===//
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/// Generic pattern classes
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class PatFpr32Fpr32<SDPatternOperator OpNode, RVInstR Inst>
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: Pat<(OpNode FPR32:$rs1, FPR32:$rs2), (Inst $rs1, $rs2)>;
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class PatFpr32Fpr32DynFrm<SDPatternOperator OpNode, RVInstRFrm Inst>
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: Pat<(OpNode FPR32:$rs1, FPR32:$rs2), (Inst $rs1, $rs2, 0b111)>;
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let Predicates = [HasStdExtF] in {
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/// Float conversion operations
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// Moves (no conversion)
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def : Pat<(bitconvert GPR:$rs1), (FMV_W_X GPR:$rs1)>;
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def : Pat<(bitconvert FPR32:$rs1), (FMV_X_W FPR32:$rs1)>;
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// [u]int32<->float conversion patterns must be gated on IsRV32 or IsRV64, so
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// are defined later.
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/// Float arithmetic operations
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def : PatFpr32Fpr32DynFrm<fadd, FADD_S>;
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def : PatFpr32Fpr32DynFrm<fsub, FSUB_S>;
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def : PatFpr32Fpr32DynFrm<fmul, FMUL_S>;
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def : PatFpr32Fpr32DynFrm<fdiv, FDIV_S>;
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def : Pat<(fsqrt FPR32:$rs1), (FSQRT_S FPR32:$rs1, 0b111)>;
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def : Pat<(fneg FPR32:$rs1), (FSGNJN_S $rs1, $rs1)>;
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def : Pat<(fabs FPR32:$rs1), (FSGNJX_S $rs1, $rs1)>;
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def : PatFpr32Fpr32<fcopysign, FSGNJ_S>;
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def : Pat<(fcopysign FPR32:$rs1, (fneg FPR32:$rs2)), (FSGNJN_S $rs1, $rs2)>;
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// fmadd: rs1 * rs2 + rs3
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def : Pat<(fma FPR32:$rs1, FPR32:$rs2, FPR32:$rs3),
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(FMADD_S $rs1, $rs2, $rs3, 0b111)>;
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// fmsub: rs1 * rs2 - rs3
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def : Pat<(fma FPR32:$rs1, FPR32:$rs2, (fneg FPR32:$rs3)),
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(FMSUB_S FPR32:$rs1, FPR32:$rs2, FPR32:$rs3, 0b111)>;
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// fnmsub: -rs1 * rs2 + rs3
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def : Pat<(fma (fneg FPR32:$rs1), FPR32:$rs2, FPR32:$rs3),
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(FNMSUB_S FPR32:$rs1, FPR32:$rs2, FPR32:$rs3, 0b111)>;
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// fnmadd: -rs1 * rs2 - rs3
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def : Pat<(fma (fneg FPR32:$rs1), FPR32:$rs2, (fneg FPR32:$rs3)),
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(FNMADD_S FPR32:$rs1, FPR32:$rs2, FPR32:$rs3, 0b111)>;
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// The RISC-V 2.2 user-level ISA spec defines fmin and fmax as returning the
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// canonical NaN when given a signaling NaN. This doesn't match the LLVM
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// behaviour (see https://bugs.llvm.org/show_bug.cgi?id=27363). However, the
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// draft 2.3 ISA spec changes the definition of fmin and fmax in a way that
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// matches LLVM's fminnum and fmaxnum
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// <https://github.com/riscv/riscv-isa-manual/commit/cd20cee7efd9bac7c5aa127ec3b451749d2b3cce>.
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def : PatFpr32Fpr32<fminnum, FMIN_S>;
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def : PatFpr32Fpr32<fmaxnum, FMAX_S>;
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/// Setcc
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def : PatFpr32Fpr32<seteq, FEQ_S>;
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def : PatFpr32Fpr32<setoeq, FEQ_S>;
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def : PatFpr32Fpr32<setlt, FLT_S>;
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def : PatFpr32Fpr32<setolt, FLT_S>;
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def : PatFpr32Fpr32<setle, FLE_S>;
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def : PatFpr32Fpr32<setole, FLE_S>;
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// Define pattern expansions for setcc operations which aren't directly
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// handled by a RISC-V instruction and aren't expanded in the SelectionDAG
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// Legalizer.
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def : Pat<(seto FPR32:$rs1, FPR32:$rs2),
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(AND (FEQ_S FPR32:$rs1, FPR32:$rs1),
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(FEQ_S FPR32:$rs2, FPR32:$rs2))>;
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def : Pat<(setuo FPR32:$rs1, FPR32:$rs2),
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(SLTIU (AND (FEQ_S FPR32:$rs1, FPR32:$rs1),
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(FEQ_S FPR32:$rs2, FPR32:$rs2)),
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1)>;
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def Select_FPR32_Using_CC_GPR : SelectCC_rrirr<FPR32, GPR>;
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/// Loads
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defm : LdPat<load, FLW>;
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/// Stores
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defm : StPat<store, FSW, FPR32>;
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} // Predicates = [HasStdExtF]
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let Predicates = [HasStdExtF, IsRV32] in {
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// float->[u]int. Round-to-zero must be used.
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def : Pat<(fp_to_sint FPR32:$rs1), (FCVT_W_S $rs1, 0b001)>;
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def : Pat<(fp_to_uint FPR32:$rs1), (FCVT_WU_S $rs1, 0b001)>;
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// [u]int->float. Match GCC and default to using dynamic rounding mode.
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def : Pat<(sint_to_fp GPR:$rs1), (FCVT_S_W $rs1, 0b111)>;
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def : Pat<(uint_to_fp GPR:$rs1), (FCVT_S_WU $rs1, 0b111)>;
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} // Predicates = [HasStdExtF, IsRV32]
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let Predicates = [HasStdExtF, IsRV32] in {
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// FP->[u]int. Round-to-zero must be used
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def : Pat<(fp_to_sint FPR32:$rs1), (FCVT_W_S $rs1, 0b001)>;
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def : Pat<(fp_to_uint FPR32:$rs1), (FCVT_WU_S $rs1, 0b001)>;
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// [u]int->fp. Match GCC and default to using dynamic rounding mode.
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def : Pat<(sint_to_fp GPR:$rs1), (FCVT_S_W $rs1, 0b111)>;
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def : Pat<(uint_to_fp GPR:$rs1), (FCVT_S_WU $rs1, 0b111)>;
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} // Predicates = [HasStdExtF, IsRV32]
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let Predicates = [HasStdExtF, IsRV64] in {
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def : Pat<(riscv_fmv_w_x_rv64 GPR:$src), (FMV_W_X GPR:$src)>;
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def : Pat<(riscv_fmv_x_anyextw_rv64 FPR32:$src), (FMV_X_W FPR32:$src)>;
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def : Pat<(sexti32 (riscv_fmv_x_anyextw_rv64 FPR32:$src)),
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(FMV_X_W FPR32:$src)>;
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// FP->[u]int32 is mostly handled by the FP->[u]int64 patterns. This is safe
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// because fpto[u|s]i produces poison if the value can't fit into the target.
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// We match the single case below because fcvt.wu.s sign-extends its result so
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// is cheaper than fcvt.lu.s+sext.w.
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def : Pat<(sext_inreg (assertzexti32 (fp_to_uint FPR32:$rs1)), i32),
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(FCVT_WU_S $rs1, 0b001)>;
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// FP->[u]int64
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def : Pat<(fp_to_sint FPR32:$rs1), (FCVT_L_S $rs1, 0b001)>;
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def : Pat<(fp_to_uint FPR32:$rs1), (FCVT_LU_S $rs1, 0b001)>;
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// [u]int->fp. Match GCC and default to using dynamic rounding mode.
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def : Pat<(sint_to_fp (sext_inreg GPR:$rs1, i32)), (FCVT_S_W $rs1, 0b111)>;
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def : Pat<(uint_to_fp (zexti32 GPR:$rs1)), (FCVT_S_WU $rs1, 0b111)>;
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def : Pat<(sint_to_fp GPR:$rs1), (FCVT_S_L $rs1, 0b111)>;
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def : Pat<(uint_to_fp GPR:$rs1), (FCVT_S_LU $rs1, 0b111)>;
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} // Predicates = [HasStdExtF, IsRV64]
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