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Riscv

riscv

RemoveRedundantMv

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class RemoveRedundantMv(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.MVOp, rewriter: PatternRewriter) -> None:
        if op.rd.type == op.rs.type and op.rd.type.is_allocated:
            rewriter.replace_op(op, [], [op.rs])

match_and_rewrite(op: riscv.MVOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.MVOp, rewriter: PatternRewriter) -> None:
    if op.rd.type == op.rs.type and op.rd.type.is_allocated:
        rewriter.replace_op(op, [], [op.rs])

RemoveRedundantFMv

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class RemoveRedundantFMv(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.FMVOp, rewriter: PatternRewriter) -> None:
        if op.rd.type == op.rs.type and op.rd.type.is_allocated:
            rewriter.replace_op(op, [], [op.rs])

match_and_rewrite(op: riscv.FMVOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.FMVOp, rewriter: PatternRewriter) -> None:
    if op.rd.type == op.rs.type and op.rd.type.is_allocated:
        rewriter.replace_op(op, [], [op.rs])

RemoveRedundantFMvD

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class RemoveRedundantFMvD(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.FMvDOp, rewriter: PatternRewriter) -> None:
        if op.rd.type == op.rs.type and op.rd.type.is_allocated:
            rewriter.replace_op(op, [], [op.rs])

match_and_rewrite(op: riscv.FMvDOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.FMvDOp, rewriter: PatternRewriter) -> None:
    if op.rd.type == op.rs.type and op.rd.type.is_allocated:
        rewriter.replace_op(op, [], [op.rs])

MultiplyImmediates

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class MultiplyImmediates(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.MulOp, rewriter: PatternRewriter) -> None:
        lhs: int | None = None
        rhs: int | None = None
        if (rs1 := get_constant_value(op.rs1)) is not None:
            lhs = rs1.value.data

        if (rs2 := get_constant_value(op.rs2)) is not None:
            rhs = rs2.value.data

        rd = op.rd.type

        match (lhs, rhs):
            case int(), None:
                rewriter.replace_op(
                    op,
                    riscv.MulOp(
                        op.rs2,
                        op.rs1,
                        rd=rd,
                    ),
                )
            case None, int():
                if rhs == 0:
                    rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))
                    return
                elif rhs == 1:
                    rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))
                    return
                else:
                    return
            case int(), int():
                rewriter.replace_op(op, rv32.LiOp(lhs * rhs, rd=rd))
            case _:
                return

match_and_rewrite(op: riscv.MulOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.MulOp, rewriter: PatternRewriter) -> None:
    lhs: int | None = None
    rhs: int | None = None
    if (rs1 := get_constant_value(op.rs1)) is not None:
        lhs = rs1.value.data

    if (rs2 := get_constant_value(op.rs2)) is not None:
        rhs = rs2.value.data

    rd = op.rd.type

    match (lhs, rhs):
        case int(), None:
            rewriter.replace_op(
                op,
                riscv.MulOp(
                    op.rs2,
                    op.rs1,
                    rd=rd,
                ),
            )
        case None, int():
            if rhs == 0:
                rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))
                return
            elif rhs == 1:
                rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))
                return
            else:
                return
        case int(), int():
            rewriter.replace_op(op, rv32.LiOp(lhs * rhs, rd=rd))
        case _:
            return

DivideByOneIdentity

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class DivideByOneIdentity(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.DivOp, rewriter: PatternRewriter) -> None:
        # Check if rs2 is a constant 1
        if (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 1:
            rd_type = op.rd.type

            # Replace the DivOp with a copy/move of rs1 to rd
            move_op = riscv.MVOp(
                op.rs1,
                rd=rd_type,
            )

            rewriter.replace_op(op, [move_op])

match_and_rewrite(op: riscv.DivOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.DivOp, rewriter: PatternRewriter) -> None:
    # Check if rs2 is a constant 1
    if (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 1:
        rd_type = op.rd.type

        # Replace the DivOp with a copy/move of rs1 to rd
        move_op = riscv.MVOp(
            op.rs1,
            rd=rd_type,
        )

        rewriter.replace_op(op, [move_op])

AddImmediates

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class AddImmediates(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AddOp, rewriter: PatternRewriter) -> None:
        lhs: int | None = None
        rhs: int | None = None
        if (rs1 := get_constant_value(op.rs1)) is not None:
            lhs = rs1.value.data

        if (rs2 := get_constant_value(op.rs2)) is not None:
            rhs = rs2.value.data

        rd = op.rd.type

        match (lhs, rhs):
            case int(), None:
                rewriter.replace_op(
                    op,
                    riscv.AddiOp(
                        op.rs2,
                        lhs,
                        rd=rd,
                        comment=op.comment,
                    ),
                )
            case None, int():
                rewriter.replace_op(
                    op,
                    riscv.AddiOp(
                        op.rs1,
                        rhs,
                        rd=rd,
                        comment=op.comment,
                    ),
                )
            case int(), int():
                rewriter.replace_op(op, rv32.LiOp(lhs + rhs, rd=rd, comment=op.comment))
            case _:
                pass

match_and_rewrite(op: riscv.AddOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AddOp, rewriter: PatternRewriter) -> None:
    lhs: int | None = None
    rhs: int | None = None
    if (rs1 := get_constant_value(op.rs1)) is not None:
        lhs = rs1.value.data

    if (rs2 := get_constant_value(op.rs2)) is not None:
        rhs = rs2.value.data

    rd = op.rd.type

    match (lhs, rhs):
        case int(), None:
            rewriter.replace_op(
                op,
                riscv.AddiOp(
                    op.rs2,
                    lhs,
                    rd=rd,
                    comment=op.comment,
                ),
            )
        case None, int():
            rewriter.replace_op(
                op,
                riscv.AddiOp(
                    op.rs1,
                    rhs,
                    rd=rd,
                    comment=op.comment,
                ),
            )
        case int(), int():
            rewriter.replace_op(op, rv32.LiOp(lhs + rhs, rd=rd, comment=op.comment))
        case _:
            pass

AddImmediateZero

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class AddImmediateZero(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AddiOp, rewriter: PatternRewriter) -> None:
        if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

match_and_rewrite(op: riscv.AddiOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AddiOp, rewriter: PatternRewriter) -> None:
    if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

AddImmediateConstant

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class AddImmediateConstant(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AddiOp, rewriter: PatternRewriter) -> None:
        if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
            op.immediate, IntegerAttr
        ):
            rd = op.rd.type
            rewriter.replace_op(
                op,
                rv32.LiOp(
                    rs1.value.data + op.immediate.value.data,
                    rd=rd,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv.AddiOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AddiOp, rewriter: PatternRewriter) -> None:
    if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
        op.immediate, IntegerAttr
    ):
        rd = op.rd.type
        rewriter.replace_op(
            op,
            rv32.LiOp(
                rs1.value.data + op.immediate.value.data,
                rd=rd,
                comment=op.comment,
            ),
        )

SubImmediates

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class SubImmediates(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.SubOp, rewriter: PatternRewriter) -> None:
        lhs: int | None = None
        rhs: int | None = None
        if (rs1 := get_constant_value(op.rs1)) is not None:
            lhs = rs1.value.data

        if (rs2 := get_constant_value(op.rs2)) is not None:
            rhs = rs2.value.data

        rd = op.rd.type

        match (lhs, rhs):
            case int(), None:
                # TODO: anything to do here?
                return
            case None, int():
                rewriter.replace_op(
                    op,
                    riscv.AddiOp(
                        op.rs1,
                        -rhs,
                        rd=rd,
                        comment=op.comment,
                    ),
                )
            case int(), int():
                rewriter.replace_op(op, rv32.LiOp(lhs - rhs, rd=rd, comment=op.comment))
            case _:
                pass

match_and_rewrite(op: riscv.SubOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.SubOp, rewriter: PatternRewriter) -> None:
    lhs: int | None = None
    rhs: int | None = None
    if (rs1 := get_constant_value(op.rs1)) is not None:
        lhs = rs1.value.data

    if (rs2 := get_constant_value(op.rs2)) is not None:
        rhs = rs2.value.data

    rd = op.rd.type

    match (lhs, rhs):
        case int(), None:
            # TODO: anything to do here?
            return
        case None, int():
            rewriter.replace_op(
                op,
                riscv.AddiOp(
                    op.rs1,
                    -rhs,
                    rd=rd,
                    comment=op.comment,
                ),
            )
        case int(), int():
            rewriter.replace_op(op, rv32.LiOp(lhs - rhs, rd=rd, comment=op.comment))
        case _:
            pass

SubBySelf

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class SubBySelf(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.SubOp, rewriter: PatternRewriter):
        """
        x - x = 0
        """
        if op.rs1 == op.rs2:
            rd = op.rd.type
            rewriter.replace_op(
                op,
                (
                    zero := rv32.GetRegisterOp(riscv.Registers.ZERO),
                    riscv.MVOp(zero.res, rd=rd, comment=op.comment),
                ),
            )

match_and_rewrite(op: riscv.SubOp, rewriter: PatternRewriter)

x - x = 0

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.SubOp, rewriter: PatternRewriter):
    """
    x - x = 0
    """
    if op.rs1 == op.rs2:
        rd = op.rd.type
        rewriter.replace_op(
            op,
            (
                zero := rv32.GetRegisterOp(riscv.Registers.ZERO),
                riscv.MVOp(zero.res, rd=rd, comment=op.comment),
            ),
        )

SubAddi

Bases: RewritePattern

(a + 4) - a -> 4

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class SubAddi(RewritePattern):
    """
    (a + 4) - a -> 4
    """

    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.SubOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.AddiOp)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
            and op.rs2 == op.rs1.op.rs1
        ):
            rd = op.rd.type
            rewriter.replace_op(op, rv32.LiOp(op.rs1.op.immediate.value.data, rd=rd))

match_and_rewrite(op: riscv.SubOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.SubOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.AddiOp)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
        and op.rs2 == op.rs1.op.rs1
    ):
        rd = op.rd.type
        rewriter.replace_op(op, rv32.LiOp(op.rs1.op.immediate.value.data, rd=rd))

AndiImmediate

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class AndiImmediate(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AndiOp, rewriter: PatternRewriter) -> None:
        if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
            op.immediate, IntegerAttr
        ):
            rd = op.rd.type
            rewriter.replace_op(
                op, rv32.LiOp(rs1.value.data & op.immediate.value.data, rd=rd)
            )

match_and_rewrite(op: riscv.AndiOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AndiOp, rewriter: PatternRewriter) -> None:
    if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
        op.immediate, IntegerAttr
    ):
        rd = op.rd.type
        rewriter.replace_op(
            op, rv32.LiOp(rs1.value.data & op.immediate.value.data, rd=rd)
        )

AndiZero

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class AndiZero(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AndiOp, rewriter: PatternRewriter) -> None:
        if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
            rd = op.rd.type
            rewriter.replace_op(op, rv32.LiOp(0, rd=rd))

match_and_rewrite(op: riscv.AndiOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AndiOp, rewriter: PatternRewriter) -> None:
    if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
        rd = op.rd.type
        rewriter.replace_op(op, rv32.LiOp(0, rd=rd))

OriImmediate

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class OriImmediate(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.OriOp, rewriter: PatternRewriter) -> None:
        if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
            op.immediate, IntegerAttr
        ):
            rd = op.rd.type
            rewriter.replace_op(
                op, rv32.LiOp(rs1.value.data | op.immediate.value.data, rd=rd)
            )

match_and_rewrite(op: riscv.OriOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.OriOp, rewriter: PatternRewriter) -> None:
    if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
        op.immediate, IntegerAttr
    ):
        rd = op.rd.type
        rewriter.replace_op(
            op, rv32.LiOp(rs1.value.data | op.immediate.value.data, rd=rd)
        )

OriImmediateZero

Bases: RewritePattern

x | 0 -> x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class OriImmediateZero(RewritePattern):
    """
    x | 0 -> x
    """

    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.OriOp, rewriter: PatternRewriter) -> None:
        if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=op.rd.type))

match_and_rewrite(op: riscv.OriOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.OriOp, rewriter: PatternRewriter) -> None:
    if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=op.rd.type))

XoriZero

Bases: RewritePattern

xor(x, 0) -> mv x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class XoriZero(RewritePattern):
    """
    xor(x, 0) -> mv x
    """

    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.XoriOp, rewriter: PatternRewriter) -> None:
        if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=op.rd.type))

match_and_rewrite(op: riscv.XoriOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.XoriOp, rewriter: PatternRewriter) -> None:
    if isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0:
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=op.rd.type))

XoriSelfInverse

Bases: RewritePattern

(x ^ a) ^ a -> x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class XoriSelfInverse(RewritePattern):
    """
    (x ^ a) ^ a -> x
    """

    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.XoriOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.XoriOp)
            and isinstance(op.immediate, IntegerAttr)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
            and op.immediate.value.data == op.rs1.op.immediate.value.data
        ):
            rd = op.rd.type
            can_erase = op.rs1.op.rd.has_one_use()
            rewriter.replace_op(op, riscv.MVOp(op.rs1.op.rs1, rd=rd))
            if can_erase:
                rewriter.erase_op(op.rs1.op)

match_and_rewrite(op: riscv.XoriOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.XoriOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.XoriOp)
        and isinstance(op.immediate, IntegerAttr)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
        and op.immediate.value.data == op.rs1.op.immediate.value.data
    ):
        rd = op.rd.type
        can_erase = op.rs1.op.rd.has_one_use()
        rewriter.replace_op(op, riscv.MVOp(op.rs1.op.rs1, rd=rd))
        if can_erase:
            rewriter.erase_op(op.rs1.op)

XoriImmediate

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class XoriImmediate(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.XoriOp, rewriter: PatternRewriter) -> None:
        if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
            op.immediate, IntegerAttr
        ):
            rd = op.rd.type
            rewriter.replace_op(
                op, rv32.LiOp(rs1.value.data ^ op.immediate.value.data, rd=rd)
            )

match_and_rewrite(op: riscv.XoriOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.XoriOp, rewriter: PatternRewriter) -> None:
    if (rs1 := get_constant_value(op.rs1)) is not None and isinstance(
        op.immediate, IntegerAttr
    ):
        rd = op.rd.type
        rewriter.replace_op(
            op, rv32.LiOp(rs1.value.data ^ op.immediate.value.data, rd=rd)
        )

ShiftbyZero

Bases: RewritePattern

shift(x, 0) -> x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class ShiftbyZero(RewritePattern):
    """
    shift(x, 0) -> x
    """

    @op_type_rewrite_pattern
    def match_and_rewrite(
        self, op: riscv.RdRsImmShiftOperation, rewriter: PatternRewriter
    ) -> None:
        # check if the shift amount is zero
        if op.immediate.value.data == 0:
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=op.rd.type))

match_and_rewrite(op: riscv.RdRsImmShiftOperation, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(
    self, op: riscv.RdRsImmShiftOperation, rewriter: PatternRewriter
) -> None:
    # check if the shift amount is zero
    if op.immediate.value.data == 0:
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=op.rd.type))

ShiftConstantFolding

Bases: RewritePattern

shift(c1, c2) -> c3

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class ShiftConstantFolding(RewritePattern):
    """
    shift(c1, c2) -> c3
    """

    @op_type_rewrite_pattern
    def match_and_rewrite(
        self, op: riscv.RdRsImmShiftOperation, rewriter: PatternRewriter
    ) -> None:
        if (rs1 := get_constant_value(op.rs1)) is not None:
            rd = op.rd.type
            val = cast(IntegerAttr[I32], rs1)
            result = op.py_operation(val)
            rewriter.replace_op(op, rv32.LiOp(result, rd=rd))

match_and_rewrite(op: riscv.RdRsImmShiftOperation, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(
    self, op: riscv.RdRsImmShiftOperation, rewriter: PatternRewriter
) -> None:
    if (rs1 := get_constant_value(op.rs1)) is not None:
        rd = op.rd.type
        val = cast(IntegerAttr[I32], rs1)
        result = op.py_operation(val)
        rewriter.replace_op(op, rv32.LiOp(result, rd=rd))

LoadWordWithKnownOffset

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class LoadWordWithKnownOffset(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.LwOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.AddiOp)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
            and isinstance(op.immediate, IntegerAttr)
        ):
            rd = op.rd.type
            rewriter.replace_op(
                op,
                riscv.LwOp(
                    op.rs1.op.rs1,
                    op.rs1.op.immediate.value.data + op.immediate.value.data,
                    rd=rd,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv.LwOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.LwOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.AddiOp)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
        and isinstance(op.immediate, IntegerAttr)
    ):
        rd = op.rd.type
        rewriter.replace_op(
            op,
            riscv.LwOp(
                op.rs1.op.rs1,
                op.rs1.op.immediate.value.data + op.immediate.value.data,
                rd=rd,
                comment=op.comment,
            ),
        )

StoreWordWithKnownOffset

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class StoreWordWithKnownOffset(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.SwOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.AddiOp)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
        ):
            rewriter.replace_op(
                op,
                riscv.SwOp(
                    op.rs1.op.rs1,
                    op.rs2,
                    op.rs1.op.immediate.value.data + op.immediate.value.data,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv.SwOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.SwOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.AddiOp)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
    ):
        rewriter.replace_op(
            op,
            riscv.SwOp(
                op.rs1.op.rs1,
                op.rs2,
                op.rs1.op.immediate.value.data + op.immediate.value.data,
                comment=op.comment,
            ),
        )

LoadFloatWordWithKnownOffset

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class LoadFloatWordWithKnownOffset(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.FLwOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.AddiOp)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
            and isinstance(op.immediate, IntegerAttr)
        ):
            rd = op.rd.type
            rewriter.replace_op(
                op,
                riscv.FLwOp(
                    op.rs1.op.rs1,
                    op.rs1.op.immediate.value.data + op.immediate.value.data,
                    rd=rd,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv.FLwOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.FLwOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.AddiOp)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
        and isinstance(op.immediate, IntegerAttr)
    ):
        rd = op.rd.type
        rewriter.replace_op(
            op,
            riscv.FLwOp(
                op.rs1.op.rs1,
                op.rs1.op.immediate.value.data + op.immediate.value.data,
                rd=rd,
                comment=op.comment,
            ),
        )

StoreFloatWordWithKnownOffset

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class StoreFloatWordWithKnownOffset(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.FSwOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.AddiOp)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
        ):
            rewriter.replace_op(
                op,
                riscv.FSwOp(
                    op.rs1.op.rs1,
                    op.rs2,
                    op.rs1.op.immediate.value.data + op.immediate.value.data,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv.FSwOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.FSwOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.AddiOp)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
    ):
        rewriter.replace_op(
            op,
            riscv.FSwOp(
                op.rs1.op.rs1,
                op.rs2,
                op.rs1.op.immediate.value.data + op.immediate.value.data,
                comment=op.comment,
            ),
        )

LoadDoubleWithKnownOffset

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class LoadDoubleWithKnownOffset(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.FLdOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.AddiOp)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
            and isinstance(op.immediate, IntegerAttr)
        ):
            rd = op.rd.type
            rewriter.replace_op(
                op,
                riscv.FLdOp(
                    op.rs1.op.rs1,
                    op.rs1.op.immediate.value.data + op.immediate.value.data,
                    rd=rd,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv.FLdOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.FLdOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.AddiOp)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
        and isinstance(op.immediate, IntegerAttr)
    ):
        rd = op.rd.type
        rewriter.replace_op(
            op,
            riscv.FLdOp(
                op.rs1.op.rs1,
                op.rs1.op.immediate.value.data + op.immediate.value.data,
                rd=rd,
                comment=op.comment,
            ),
        )

StoreDoubleWithKnownOffset

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class StoreDoubleWithKnownOffset(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.FSdOp, rewriter: PatternRewriter) -> None:
        if (
            isinstance(op.rs1, OpResult)
            and isinstance(op.rs1.op, riscv.AddiOp)
            and isinstance(op.rs1.op.immediate, IntegerAttr)
        ):
            rewriter.replace_op(
                op,
                riscv.FSdOp(
                    op.rs1.op.rs1,
                    op.rs2,
                    op.rs1.op.immediate.value.data + op.immediate.value.data,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv.FSdOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.FSdOp, rewriter: PatternRewriter) -> None:
    if (
        isinstance(op.rs1, OpResult)
        and isinstance(op.rs1.op, riscv.AddiOp)
        and isinstance(op.rs1.op.immediate, IntegerAttr)
    ):
        rewriter.replace_op(
            op,
            riscv.FSdOp(
                op.rs1.op.rs1,
                op.rs2,
                op.rs1.op.immediate.value.data + op.immediate.value.data,
                comment=op.comment,
            ),
        )

AdditionOfSameVariablesToMultiplyByTwo

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class AdditionOfSameVariablesToMultiplyByTwo(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AddOp, rewriter: PatternRewriter) -> None:
        if op.rs1 == op.rs2:
            rd = op.rd.type
            rewriter.replace_op(
                op,
                [
                    li_op := rv32.LiOp(2),
                    riscv.MulOp(
                        op.rs1,
                        li_op,
                        rd=rd,
                        comment=op.comment,
                    ),
                ],
            )

match_and_rewrite(op: riscv.AddOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AddOp, rewriter: PatternRewriter) -> None:
    if op.rs1 == op.rs2:
        rd = op.rd.type
        rewriter.replace_op(
            op,
            [
                li_op := rv32.LiOp(2),
                riscv.MulOp(
                    op.rs1,
                    li_op,
                    rd=rd,
                    comment=op.comment,
                ),
            ],
        )

FuseMultiplyAddD

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class FuseMultiplyAddD(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.FAddDOp, rewriter: PatternRewriter) -> None:
        """
        Converts `c = a * b` and `d = e + c` to `d = e + a * b`.
        `c` should not be used anywhere else and both operations must have the
        `contract` fastmath flag set.
        """

        if not _has_contract_flag(op):
            return

        addend = mul = None
        if (
            isinstance(mul := op.rs2.owner, riscv.FMulDOp)
            and _has_contract_flag(mul)
            and mul.rd.has_one_use()
        ):
            addend = op.rs1
        elif (
            isinstance(mul := op.rs1.owner, riscv.FMulDOp)
            and _has_contract_flag(mul)
            and mul.rd.has_one_use()
        ):
            addend = op.rs2
        else:
            return

        rd = op.rd.type
        rewriter.replace_op(
            op,
            riscv.FMAddDOp(
                mul.rs1,
                mul.rs2,
                addend,
                rd=rd,
                comment=op.comment,
            ),
        )

match_and_rewrite(op: riscv.FAddDOp, rewriter: PatternRewriter) -> None

Converts c = a * b and d = e + c to d = e + a * b. c should not be used anywhere else and both operations must have the contract fastmath flag set.

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.FAddDOp, rewriter: PatternRewriter) -> None:
    """
    Converts `c = a * b` and `d = e + c` to `d = e + a * b`.
    `c` should not be used anywhere else and both operations must have the
    `contract` fastmath flag set.
    """

    if not _has_contract_flag(op):
        return

    addend = mul = None
    if (
        isinstance(mul := op.rs2.owner, riscv.FMulDOp)
        and _has_contract_flag(mul)
        and mul.rd.has_one_use()
    ):
        addend = op.rs1
    elif (
        isinstance(mul := op.rs1.owner, riscv.FMulDOp)
        and _has_contract_flag(mul)
        and mul.rd.has_one_use()
    ):
        addend = op.rs2
    else:
        return

    rd = op.rd.type
    rewriter.replace_op(
        op,
        riscv.FMAddDOp(
            mul.rs1,
            mul.rs2,
            addend,
            rd=rd,
            comment=op.comment,
        ),
    )

BitwiseAndByZero

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class BitwiseAndByZero(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AndOp, rewriter: PatternRewriter):
        """
        rewrite pattern to optimize bitwise and by 0
        x & 0 = 0
        """

        # check if the first operand is 0
        if (rs1 := get_constant_value(op.rs1)) is not None and rs1.value.data == 0:
            # if the first operand is 0, set the destination to 0
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

        # check if the second operand is 0
        if (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 0:
            # if the second operand is 0, set the destination to 0
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))

match_and_rewrite(op: riscv.AndOp, rewriter: PatternRewriter)

rewrite pattern to optimize bitwise and by 0 x & 0 = 0

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AndOp, rewriter: PatternRewriter):
    """
    rewrite pattern to optimize bitwise and by 0
    x & 0 = 0
    """

    # check if the first operand is 0
    if (rs1 := get_constant_value(op.rs1)) is not None and rs1.value.data == 0:
        # if the first operand is 0, set the destination to 0
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

    # check if the second operand is 0
    if (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 0:
        # if the second operand is 0, set the destination to 0
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))

BitwiseAndBySelf

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class BitwiseAndBySelf(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.AndOp, rewriter: PatternRewriter):
        """
        x & x = x
        """
        if op.rs1 == op.rs2:
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd, comment=op.comment))

match_and_rewrite(op: riscv.AndOp, rewriter: PatternRewriter)

x & x = x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.AndOp, rewriter: PatternRewriter):
    """
    x & x = x
    """
    if op.rs1 == op.rs2:
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd, comment=op.comment))

BitwiseOrByZero

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class BitwiseOrByZero(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.OrOp, rewriter: PatternRewriter):
        """
        x | 0 = x
        """

        # check if the first operand is 0
        if (rs1 := get_constant_value(op.rs1)) is not None and rs1.value.data == 0:
            # if the first operand is 0, set the destination to the second operand
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))

        # check if the second operand is 0
        elif (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 0:
            # if the second operand is 0, set the destination to first operand
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

match_and_rewrite(op: riscv.OrOp, rewriter: PatternRewriter)

x | 0 = x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.OrOp, rewriter: PatternRewriter):
    """
    x | 0 = x
    """

    # check if the first operand is 0
    if (rs1 := get_constant_value(op.rs1)) is not None and rs1.value.data == 0:
        # if the first operand is 0, set the destination to the second operand
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))

    # check if the second operand is 0
    elif (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 0:
        # if the second operand is 0, set the destination to first operand
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

BitwiseOrBySelf

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class BitwiseOrBySelf(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.OrOp, rewriter: PatternRewriter):
        """
        x | x = x
        """
        if op.rs1 == op.rs2:
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd, comment=op.comment))

match_and_rewrite(op: riscv.OrOp, rewriter: PatternRewriter)

x | x = x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.OrOp, rewriter: PatternRewriter):
    """
    x | x = x
    """
    if op.rs1 == op.rs2:
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd, comment=op.comment))

XorBySelf

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class XorBySelf(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.XorOp, rewriter: PatternRewriter):
        """
        x ^ x = 0
        """
        if op.rs1 == op.rs2:
            rd = op.rd.type
            rewriter.replace_op(
                op,
                (
                    zero := rv32.GetRegisterOp(riscv.Registers.ZERO),
                    riscv.MVOp(zero.res, rd=rd, comment=op.comment),
                ),
            )

match_and_rewrite(op: riscv.XorOp, rewriter: PatternRewriter)

x ^ x = 0

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.XorOp, rewriter: PatternRewriter):
    """
    x ^ x = 0
    """
    if op.rs1 == op.rs2:
        rd = op.rd.type
        rewriter.replace_op(
            op,
            (
                zero := rv32.GetRegisterOp(riscv.Registers.ZERO),
                riscv.MVOp(zero.res, rd=rd, comment=op.comment),
            ),
        )

BitwiseXorByZero

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class BitwiseXorByZero(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: riscv.XorOp, rewriter: PatternRewriter):
        """
        x ^ 0 = x
        """
        if (rs1 := get_constant_value(op.rs1)) is not None and rs1.value.data == 0:
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))

        if (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 0:
            rd = op.rd.type
            rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

match_and_rewrite(op: riscv.XorOp, rewriter: PatternRewriter)

x ^ 0 = x

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: riscv.XorOp, rewriter: PatternRewriter):
    """
    x ^ 0 = x
    """
    if (rs1 := get_constant_value(op.rs1)) is not None and rs1.value.data == 0:
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs2, rd=rd))

    if (rs2 := get_constant_value(op.rs2)) is not None and rs2.value.data == 0:
        rd = op.rd.type
        rewriter.replace_op(op, riscv.MVOp(op.rs1, rd=rd))

ScfgwOpUsingImmediate

Bases: RewritePattern

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class ScfgwOpUsingImmediate(RewritePattern):
    @op_type_rewrite_pattern
    def match_and_rewrite(
        self, op: riscv_snitch.ScfgwOp, rewriter: PatternRewriter
    ) -> None:
        if (rs2 := get_constant_value(op.rs2)) is not None:
            rewriter.replace_op(
                op,
                riscv_snitch.ScfgwiOp(
                    op.rs1,
                    rs2.value.data,
                    comment=op.comment,
                ),
            )

match_and_rewrite(op: riscv_snitch.ScfgwOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(
    self, op: riscv_snitch.ScfgwOp, rewriter: PatternRewriter
) -> None:
    if (rs2 := get_constant_value(op.rs2)) is not None:
        rewriter.replace_op(
            op,
            riscv_snitch.ScfgwiOp(
                op.rs1,
                rs2.value.data,
                comment=op.comment,
            ),
        )

LoadImmediate0

Bases: RewritePattern

The canonical form of an operation that stores a 0 to register RD is li RD, ZERO.

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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class LoadImmediate0(RewritePattern):
    """
    The canonical form of an operation that stores a 0 to register RD is li RD, ZERO.
    """

    @op_type_rewrite_pattern
    def match_and_rewrite(self, op: rv32.LiOp, rewriter: PatternRewriter) -> None:
        if not (isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0):
            return

        rd = op.rd.type
        if rd == riscv.Registers.ZERO:
            rewriter.replace_op(op, rv32.GetRegisterOp(riscv.Registers.ZERO))
        else:
            rewriter.replace_op(
                op,
                (
                    zero := rv32.GetRegisterOp(riscv.Registers.ZERO),
                    riscv.MVOp(zero.res, rd=rd, comment=op.comment),
                ),
            )

match_and_rewrite(op: rv32.LiOp, rewriter: PatternRewriter) -> None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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@op_type_rewrite_pattern
def match_and_rewrite(self, op: rv32.LiOp, rewriter: PatternRewriter) -> None:
    if not (isinstance(op.immediate, IntegerAttr) and op.immediate.value.data == 0):
        return

    rd = op.rd.type
    if rd == riscv.Registers.ZERO:
        rewriter.replace_op(op, rv32.GetRegisterOp(riscv.Registers.ZERO))
    else:
        rewriter.replace_op(
            op,
            (
                zero := rv32.GetRegisterOp(riscv.Registers.ZERO),
                riscv.MVOp(zero.res, rd=rd, comment=op.comment),
            ),
        )

get_constant_value(value: SSAValue) -> IntegerAttr[I32] | IntegerAttr[I64] | None

Source code in xdsl/transforms/canonicalization_patterns/riscv.py 
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def get_constant_value(
    value: SSAValue,
) -> IntegerAttr[I32] | IntegerAttr[I64] | None:
    if not isinstance(value, OpResult):
        return

    if value.type == riscv.Registers.ZERO:
        if isinstance(value.op, rv32.GetRegisterOp):
            return IntegerAttr(0, i32)
        elif isinstance(value.op, rv64.GetRegisterOp):
            return IntegerAttr(0, i64)

    if isinstance(value.op, riscv.MVOp):
        return get_constant_value(value.op.rs)

    if (
        result := ConstantLike.get_constant_value(value)
    ) is not None and _I32_I64_CONSTRAINT.verifies(result):
        return cast(IntegerAttr[I32] | IntegerAttr[I64], result)