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reg.go
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reg.go
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package regalloc
import (
"fmt"
"github.com/AR1011/wazero/internal/engine/wazevo/ssa"
)
// VReg represents a register which is assigned to an SSA value. This is used to represent a register in the backend.
// A VReg may or may not be a physical register, and the info of physical register can be obtained by RealReg.
type VReg uint64
// VRegID is the lower 32bit of VReg, which is the pure identifier of VReg without RealReg info.
type VRegID uint32
// RealReg returns the RealReg of this VReg.
func (v VReg) RealReg() RealReg {
return RealReg(v >> 32)
}
// IsRealReg returns true if this VReg is backed by a physical register.
func (v VReg) IsRealReg() bool {
return v.RealReg() != RealRegInvalid
}
// FromRealReg returns a VReg from the given RealReg and RegType.
// This is used to represent a specific pre-colored register in the backend.
func FromRealReg(r RealReg, typ RegType) VReg {
rid := VRegID(r)
if rid > vRegIDReservedForRealNum {
panic(fmt.Sprintf("invalid real reg %d", r))
}
return VReg(r).SetRealReg(r).SetRegType(typ)
}
// SetRealReg sets the RealReg of this VReg and returns the updated VReg.
func (v VReg) SetRealReg(r RealReg) VReg {
return VReg(r)<<32 | (v & 0xff_00_ffffffff)
}
// RegType returns the RegType of this VReg.
func (v VReg) RegType() RegType {
return RegType(v >> 40)
}
// SetRegType sets the RegType of this VReg and returns the updated VReg.
func (v VReg) SetRegType(t RegType) VReg {
return VReg(t)<<40 | (v & 0x00_ff_ffffffff)
}
// ID returns the VRegID of this VReg.
func (v VReg) ID() VRegID {
return VRegID(v & 0xffffffff)
}
// Valid returns true if this VReg is Valid.
func (v VReg) Valid() bool {
return v.ID() != vRegIDInvalid && v.RegType() != RegTypeInvalid
}
// RealReg represents a physical register.
type RealReg byte
const RealRegInvalid RealReg = 0
const (
vRegIDInvalid VRegID = 1 << 31
VRegIDNonReservedBegin = vRegIDReservedForRealNum
vRegIDReservedForRealNum VRegID = 128
VRegInvalid = VReg(vRegIDInvalid)
)
// String implements fmt.Stringer.
func (r RealReg) String() string {
switch r {
case RealRegInvalid:
return "invalid"
default:
return fmt.Sprintf("r%d", r)
}
}
// String implements fmt.Stringer.
func (v VReg) String() string {
if v.IsRealReg() {
return fmt.Sprintf("r%d", v.ID())
}
return fmt.Sprintf("v%d?", v.ID())
}
// RegType represents the type of a register.
type RegType byte
const (
RegTypeInvalid RegType = iota
RegTypeInt
RegTypeFloat
NumRegType
)
// String implements fmt.Stringer.
func (r RegType) String() string {
switch r {
case RegTypeInt:
return "int"
case RegTypeFloat:
return "float"
default:
return "invalid"
}
}
// RegTypeOf returns the RegType of the given ssa.Type.
func RegTypeOf(p ssa.Type) RegType {
switch p {
case ssa.TypeI32, ssa.TypeI64:
return RegTypeInt
case ssa.TypeF32, ssa.TypeF64, ssa.TypeV128:
return RegTypeFloat
default:
panic("invalid type")
}
}
const RealRegsNumMax = 128