lib/Target/RISCV/RISCVGISel.td

//===-- RISCVGIsel.td - RISC-V GlobalISel Patterns ---------*- 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
//
//===----------------------------------------------------------------------===//
//
/// \file
/// This file contains patterns that are relevant to GlobalISel, including
/// GIComplexOperandMatcher definitions for equivalent SelectionDAG
/// ComplexPatterns.
//
//===----------------------------------------------------------------------===//

include "RISCV.td"
include "RISCVCombine.td"

def simm12Plus1 : ImmLeaf<XLenVT, [{
    return Imm >= -2047 && Imm <= 2048;}]>;
def simm12Plus1i32 : ImmLeaf<i32, [{
    return Imm >= -2047 && Imm <= 2048;}]>;

// FIXME: This doesn't check that the G_CONSTANT we're deriving the immediate
// from is only used once
def simm12Minus1Nonzero : ImmLeaf<XLenVT, [{
  return Imm >= -2049 && Imm <= 2046 && Imm != 0;}]>;

def simm12Minus1NonzeroNonNeg1 : ImmLeaf<XLenVT, [{
  return (Imm >= -2049 && Imm < -1) || (Imm > 0 && Imm <= 2046);}]>;

// Return an immediate value plus 1.
def ImmPlus1 : SDNodeXForm<imm, [{
  return CurDAG->getTargetConstant(N->getSExtValue() + 1, SDLoc(N),
                                   N->getValuePtrVTpe(0));}]>;
def GIImmPlus1 :
  GICustomOperandRenderer<"renderImmPlus1">,
  GISDNodeXFormEquiv<ImmPlus1>;

// Ptr type used in patterns with GlobalISelEmitter
def PtrVT : PtrValueTypeByHwMode<XLenVT, 0>;

// Define pattern expansions for pointer ult/slt conditional codes
def : Pat<(XLenVT (setult (PtrVT GPR:$rs1), simm12_lo:$imm12)),
          (SLTIU GPR:$rs1, simm12_lo:$imm12)>;
def : Pat<(XLenVT (setult (PtrVT GPR:$rs1), (PtrVT GPR:$rs2))),
          (SLTU GPR:$rs1, GPR:$rs2)>;
def : Pat<(XLenVT (setlt (PtrVT GPR:$rs1), simm12_lo:$imm12)),
          (SLTI GPR:$rs1, simm12_lo:$imm12)>;
def : Pat<(XLenVT (setlt (PtrVT GPR:$rs1), (PtrVT GPR:$rs2))),
          (SLT GPR:$rs1, GPR:$rs2)>;

// Define pattern expansions for setcc operations that aren't directly
// handled by a RISC-V instruction.
foreach Ty = [PtrVT, XLenVT] in {
def : Pat<(XLenVT (seteq (Ty GPR:$rs1), (Ty 0))), (SLTIU GPR:$rs1, 1)>;
def : Pat<(XLenVT (seteq (Ty GPR:$rs1), (Ty simm12Plus1:$imm12))),
          (SLTIU (ADDI GPR:$rs1, (NegImm simm12Plus1:$imm12)), 1)>;
def : Pat<(XLenVT (seteq (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (SLTIU (XOR GPR:$rs1, GPR:$rs2), 1)>;
def : Pat<(XLenVT (setne (Ty GPR:$rs1), (Ty 0))), (SLTU (XLenVT X0), GPR:$rs1)>;
def : Pat<(XLenVT (setne (Ty GPR:$rs1), (Ty simm12Plus1:$imm12))),
          (SLTU (XLenVT X0), (ADDI GPR:$rs1, (NegImm simm12Plus1:$imm12)))>;
def : Pat<(XLenVT (setne (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (SLTU (XLenVT X0), (XOR GPR:$rs1, GPR:$rs2))>;
def : Pat<(XLenVT (setugt (Ty GPR:$rs1), (Ty simm12Minus1NonzeroNonNeg1:$imm))),
          (XORI (SLTIU GPR:$rs1,
                       (ImmPlus1 simm12Minus1NonzeroNonNeg1:$imm)), 1)>;
def : Pat<(XLenVT (setugt (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (SLTU GPR:$rs2, GPR:$rs1)>;
def : Pat<(XLenVT (setgt (Ty GPR:$rs1), (Ty simm12Minus1Nonzero:$imm))),
          (XORI (SLTI GPR:$rs1, (ImmPlus1 simm12Minus1Nonzero:$imm)), 1)>;
def : Pat<(XLenVT (setgt (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (SLT GPR:$rs2, GPR:$rs1)>;
def : Pat<(XLenVT (setuge (XLenVT GPR:$rs1), (Ty simm12_lo:$imm))),
          (XORI (SLTIU GPR:$rs1, simm12_lo:$imm), 1)>;
def : Pat<(XLenVT (setuge (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (XORI (SLTU GPR:$rs1, GPR:$rs2), 1)>;
def : Pat<(XLenVT (setge (Ty GPR:$rs1), (Ty simm12_lo:$imm))),
          (XORI (SLTI GPR:$rs1, simm12_lo:$imm), 1)>;
def : Pat<(XLenVT (setge (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (XORI (SLT GPR:$rs1, GPR:$rs2), 1)>;
def : Pat<(XLenVT (setule (Ty GPR:$rs1), (Ty simm12Minus1NonzeroNonNeg1:$imm))),
          (SLTIU GPR:$rs1, (ImmPlus1 simm12Minus1NonzeroNonNeg1:$imm))>;
def : Pat<(XLenVT (setule (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (XORI (SLTU GPR:$rs2, GPR:$rs1), 1)>;
def : Pat<(XLenVT (setle (Ty GPR:$rs1), (Ty simm12Minus1Nonzero:$imm))),
          (SLTI GPR:$rs1, (ImmPlus1 simm12Minus1Nonzero:$imm))>;
def : Pat<(XLenVT (setle (Ty GPR:$rs1), (Ty GPR:$rs2))),
          (XORI (SLT GPR:$rs2, GPR:$rs1), 1)>;
}

let Predicates = [IsRV32] in {
def : LdPat<load, LW, PtrVT>;
def : StPat<store, SW, GPR, PtrVT>;
}

let Predicates = [IsRV64] in {
def : LdPat<load, LD, PtrVT>;
def : StPat<store, SD, GPR, PtrVT>;
}

//===----------------------------------------------------------------------===//
// RV64 i32 patterns not used by SelectionDAG
//===----------------------------------------------------------------------===//

let Predicates = [IsRV64] in {
def : Pat<(sext_inreg (i64 (add GPR:$rs1, simm12_lo:$imm)), i32),
          (ADDIW GPR:$rs1, simm12_lo:$imm)>;
}